.hide-partial { max-height: none; } .show-more { display: none; }

6 MHz Frequency Control & Timing Devices

.catnav-wrapper { height: auto; overflow: visible; } .catalog-nav-tabs ul { white-space: normal; }

Types of Frequency Control & Timing Devices

List Images

Results: 1.340

Applied Filters:

Frequency = 6 MHz

Manufacturer

Product Type

Frequency Stability

Tolerance

Termination Style

Package/Case

Minimum Operating Temperature

Maximum Operating Temperature

Qualification

Packaging

Reset All

Search within results

In Stock

Normally Stocked

Active

New Products

RoHS Compliant

.search-refine-wrapper { display: inline-block; min-width: 100%; } .scroll-body { overflow-x: visible; } .search-table-wrapper { overflow: visible; } .hide-partial { max-height: none; } .show-more { display: none; }

Part #

Crystals HC-49U/S-SM GND Lead Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 18pF

GL060F35IDT
CTS Electronic Components
1: 0,464 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
GL060F35IDT

Mouser Part No
774-GL060F35IDT

CTS Electronic Components

Crystals HC-49U/S-SM GND Lead Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 18pF

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,464 €

0,396 €

0,375 €

0,341 €

Reel

0,256 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

50 PPM

30 PPM

SMD/SMT

11.7 mm x 5 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM GND Lead Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 20pF

GL060F35IET
CTS Electronic Components
1: 0,464 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
GL060F35IET

Mouser Part No
774-GL060F35IET

CTS Electronic Components

Crystals HC-49U/S-SM GND Lead Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 20pF

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,464 €

0,396 €

0,375 €

0,341 €

Reel

0,257 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

50 PPM

30 PPM

SMD/SMT

11.7 mm x 5 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

LP060F23CDT
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F23CDT

Mouser Part No
774-LP060F23CDT

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,247 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

20 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

LP060F23CET
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F23CET

Mouser Part No
774-LP060F23CET

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,247 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

20 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

LP060F23IDT
CTS Electronic Components
1: 0,464 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F23IDT

Mouser Part No
774-LP060F23IDT

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,464 €

0,396 €

0,375 €

0,341 €

Reel

0,257 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

20 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

LP060F23IET
CTS Electronic Components
1: 0,464 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F23IET

Mouser Part No
774-LP060F23IET

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 20ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,464 €

0,396 €

0,375 €

0,341 €

Reel

0,255 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

20 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

LP060F33CDT
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F33CDT

Mouser Part No
774-LP060F33CDT

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,247 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

LP060F33CET
CTS Electronic Components
1: 0,439 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F33CET

Mouser Part No
774-LP060F33CET

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,439 €

0,379 €

0,359 €

0,327 €

Reel

0,252 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

LP060F33IDT
CTS Electronic Components
1: 0,464 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F33IDT

Mouser Part No
774-LP060F33IDT

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,464 €

0,396 €

0,375 €

0,341 €

Reel

0,257 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

LP060F33IET
CTS Electronic Components
1: 0,464 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F33IET

Mouser Part No
774-LP060F33IET

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,464 €

0,396 €

0,375 €

0,341 €

Reel

0,257 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -20 C/70 C, 18pF, Fund

LP060F35CDT
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F35CDT

Mouser Part No
774-LP060F35CDT

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -20 C/70 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,248 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

50 PPM

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -20 C/70 C, 20pF, Fund

LP060F35CET
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F35CET

Mouser Part No
774-LP060F35CET

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -20 C/70 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,245 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

50 PPM

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 18pF, Fund

LP060F35IDT
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F35IDT

Mouser Part No
774-LP060F35IDT

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,247 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

50 PPM

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 20pF, Fund

LP060F35IET
CTS Electronic Components
1: 0,447 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
LP060F35IET

Mouser Part No
774-LP060F35IET

CTS Electronic Components

Crystals HC-49U/S-SM 3.2mm Height Crystal 6.000000 MHz Tol 30ppm, Stab 50ppm, -40 C/85 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,447 €

0,38 €

0,36 €

0,328 €

Reel

0,247 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

50 PPM

30 PPM

SMD/SMT

11.1 mm x 3.2 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

TS060F23CDT
CTS Electronic Components
1: 0,413 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F23CDT

Mouser Part No
774-TS060F23CDT

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,413 €

0,353 €

0,335 €

0,304 €

Reel

0,246 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

TS060F23CET
CTS Electronic Components
1: 0,413 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F23CET

Mouser Part No
774-TS060F23CET

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,413 €

0,353 €

0,335 €

0,304 €

Reel

0,246 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

TS060F23IDT
CTS Electronic Components
1: 0,439 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F23IDT

Mouser Part No
774-TS060F23IDT

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,439 €

0,369 €

0,35 €

0,318 €

Reel

0,256 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

TS060F23IET
CTS Electronic Components
1: 0,439 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F23IET

Mouser Part No
774-TS060F23IET

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,439 €

0,369 €

0,35 €

0,318 €

Reel

0,256 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

TS060F33CDT
CTS Electronic Components
1: 0,413 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F33CDT

Mouser Part No
774-TS060F33CDT

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,413 €

0,353 €

0,335 €

0,304 €

Reel

0,25 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

TS060F33CET
CTS Electronic Components
1: 0,413 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F33CET

Mouser Part No
774-TS060F33CET

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -20 C/70 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,413 €

0,353 €

0,335 €

0,304 €

Reel

0,246 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 20 C

+ 70 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

TS060F33IDT
CTS Electronic Components
1: 0,705 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F33IDT

Mouser Part No
774-TS060F33IDT

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 18pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,705 €

0,601 €

0,57 €

0,518 €

Reel

0,411 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 40 C

+ 85 C

Reel, Cut Tape

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

TS060F33IET
CTS Electronic Components
1: 0,439 €
Non-Stocked Lead-Time 12 Weeks

Mfr. Part No.
TS060F33IET

Mouser Part No
774-TS060F33IET

CTS Electronic Components

Crystals HC-49U/S-SM Crystal 6.000000 MHz Tol 30ppm, Stab 30ppm, -40 C/85 C, 20pF, Fund

Datasheet

Non-Stocked Lead-Time 12 Weeks

Cut Tape

0,439 €

0,369 €

0,35 €

0,318 €

Reel

0,255 €

View

Min.: 1
Mult.: 1

: 1.000

Crystals

6 MHz

30 PPM

SMD/SMT

11.1 mm x 4.83 mm

- 40 C

+ 85 C

Reel, Cut Tape

Standard Clock Oscillators -20 to 70C, 5032, 20ppm, 3.3V, 100MHz, 60 PPM PR, T&R

SiT1602AC-22-25E-6.000000G
SiTime
1: 1,30 €
Non-Stocked Lead-Time 6 Weeks
New At Mouser

Mfr. Part No.
SiT1602AC-22-25E-6.000000G

Mouser Part No
788-1602AC2225E6000G

New At Mouser

SiTime

Standard Clock Oscillators -20 to 70C, 5032, 20ppm, 3.3V, 100MHz, 60 PPM PR, T&R

Datasheet

Non-Stocked Lead-Time 6 Weeks

Cut Tape

1,30 €

1,14 €

1,03 €

0,989 €

Reel

0,92 €

View

MouseReel Available

Min.: 1
Mult.: 1

: 250

MEMS Oscillators

6 MHz

25 PPM

SMD/SMT

3.2 mm x 2.5 mm

- 20 C

+ 70 C

Reel, Cut Tape, MouseReel

Standard Clock Oscillators -20 to 70C, 2016, 50ppm, 1.8V, 6MHz, OE, 250 pcs T&R 8 mm

SiT8008ACB73-18E-6.000000G
SiTime
1: 1,19 €
Non-Stocked Lead-Time 6 Weeks
New At Mouser

Mfr. Part No.
SiT8008ACB73-18E-6.000000G

Mouser Part No
788-8008ACB7318E600G

New At Mouser

SiTime

Standard Clock Oscillators -20 to 70C, 2016, 50ppm, 1.8V, 6MHz, OE, 250 pcs T&R 8 mm

Datasheet

Non-Stocked Lead-Time 6 Weeks

Cut Tape

1,19 €

1,02 €

0,972 €

0,877 €

Reel

0,814 €

View

MouseReel Available

Min.: 1
Mult.: 1

: 250

MEMS Oscillators

6 MHz

50 PPM

SMD/SMT

2 mm x 1.6 mm

- 20 C

+ 70 C

Reel, Cut Tape, MouseReel

Crystals 6MHz 16pF -10C 60C

LFXTAL031928
IQD
1.000: 0,192 €
Non-Stocked
Factory Special Order

Mfr. Part No.
LFXTAL031928

Mouser Part No
449-LFXTAL031928

Factory Special Order

IQD

Crystals 6MHz 16pF -10C 60C

Datasheet

Non-Stocked

Reel

0,192 €

0,191 €

0,183 €

Min.: 1.000
Mult.: 1.000

: 1.000

Crystals

6 MHz

SMD/SMT

- 10 C

+ 60 C

Reel

6 MHz Frequency Control & Timing Devices

Types of Frequency Control & Timing Devices

Customer Service Office

Company

Resources

Support

0605 (1612 metric)
0806 (2016 metric)
1008 (2520 metric)
10 mm x 4.5 mm
11.1 mm x 3.2 mm
11.1 mm x 4.83 mm
11.4 mm x 4.7 mm
11.4 mm x 4.8 mm
11.4 mm x 4.9 mm
11.5 mm x 4.7 mm
11.7 mm x 5 mm
11.8 mm x 5.5 mm
12.5 mm x 4.6 mm
13.2 mm x 13.2 mm
13.3 mm x 4.85 mm
13.5 mm x 5 mm
1310 (3225 metric)
14 mm x 8.65 mm
2.5 mm x 2 mm
2 mm x 1.6 mm