M4T28-BR12SH1 — Real-Time Clock and Timekeeper SnaphatBattery with Crystal

✓ Government record, cited

— · BATTERY · LITHIUM

PRODUCT OVERVIEW

M4T28-BR12SH1: Real-Time Clock and Timekeeper SnaphatBattery with Crystal.

The the manufacturer M4T28-BR12SH1 is a Battery-Backed Write Cache pack, designed for enterprise RAID controllers in enterprise servers. It provides backup power to the BBWC module during unexpected power loss, ensuring cached write data is safely committed to flash memory. This is a high-volume replacement part in TPM market as enterprise servers remain widely deployed.

This part is cataloged in the U.S. Government catalog under NSN 6135-01-478-4657, indicating validated use in U.S. government and defense logistics supply chains.

WHERE IT FITS

BATTERY→ LITHIUM→ M4T28-BR12SH1

NSN: 6135-01-478-4657
NIINs: 014784657, 015808349
FSC: 6135 — Batteries, Nonrechargeable
CAGE: 50088 — STMICROELECTRONICS INC (USA)

SPECIFICATIONS

Part Number	M4T28-BR12SH1
NSN	6135-01-478-4657

COMPONENT DIAGRAM

KEY FEATURES

•

Battery-Backed Write Cache Module

•

Rechargeable Battery Technology

Provides cache backup power for 48+ hours after power loss

•

Hot-Plug Capable

TYPICAL APPLICATIONS

RAID cache protection during power loss events
Write-back cache enablement for storage controllers
Enterprise server data integrity assurance
Hot-swap battery/capacitor replacement in production

TECHNICAL CHARACTERISTICS

OVERALL HEIGHT	0.385 INCHES NOMINAL IN
TERMINAL QUANTITY	2
TERMINAL TYPE	PIN BOTTOM
PRECIOUS MATERIAL	GOLD
VOLTAGE IN VOLTS	2.8
SHAPE	RECTANGULAR
OVERALL LENGTH	0.835 INCHES MINIMUM AND 0.860 INCHES MAXIMUM IN
OVERALL WIDTH	0.560 INCHES MINIMUM AND 0.590 INCHES MAXIMUM IN
BATTERY ELECTROLYTE	LITHIUM
SPECIAL FEATURES	ITEM IS A TIMEKEEPER SNAPHAT (BATTERY AND CRYSTAL); OPERATING TEMPERATURE: 0 TO 70 DEGREES C, STORAGE TEMPERATURE: -40 TO 85 DEGREES C; NOMINAL BATTERY CAPACITY: 48MAH; LOAD CAPACITANCE: 12.5 PF; NOMINAL CRYSTAL FREQUENCY: 32.768 KHZ KHz

SUBSTITUTES & CROSS-REFERENCES 8

352250053023Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

M4T28-BR12SHSame NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

1039923279100Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

10069459Reference document

Same NSN cross-reference

Reference document — Informative reference only

1AAN019017Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

860BT0028Same NSN cross-reference

Same NSN cross-reference

Also cataloged under this NSN

LIFECYCLE

NSN statusActive· U.S. Government catalog

HAZMAT per U.S. Government catalogShelf-life managedDG Class 9 — LithiumRestricted Air FreightNo demilitarization required

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FREQUENTLY ASKED QUESTIONS

What is M4T28-BR12SH1?

M4T28-BR12SH1 is a Real-Time Clock and Timekeeper SnaphatBattery with Crystal. It is classified as a BATTERY (LITHIUM).

What parts can replace M4T28-BR12SH1?

There are 8 known substitutes for M4T28-BR12SH1: 352250053023, M4T28-BR12SH, 1039923279100 and 5 more. Substitute compatibility should be verified for your specific system.

What is the NSN for M4T28-BR12SH1?

M4T28-BR12SH1 is cataloged in the U.S. Government catalog under NSN 6135-01-478-4657. This indicates validated use in U.S. government and defense supply chains.

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