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Home > Products > Integrated Circuits (ICs) > Clock/Timing > Real Time Clocks

STMicroelectronics M48T35AV-10MH1E

Name: M48T35AV-10MH1E
Brand: STMicroelectronics
SKU: M48T35AV-10MH1E
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M48T35AV-10MH1E

Manufacturer:: STMicroelectronics

Category:: Real Time Clocks

Package:: 28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets

Datasheet:: M48T35AV-10MH1E.pdf

Description:: IC RTC CLK/CALENDAR PAR 28SOH

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Inventory:1,221

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Product details

Overview

M48T35AV-10MH1E from STMicroelectronics is a 3.3 V, 256 Kbit (32 K × 8) non-volatile TIMEKEEPER® SRAM integrating ultra-low-power static RAM, real-time clock, power-fail control circuitry, and on-board lithium battery + crystal in a CAPHAT™ DIP-28 package. It delivers BCD-coded timekeeping (year/month/day/hour/minute/second), battery low flag (BOK), frequency test output, and automatic WRITE protection during V_CC brownout - used in industrial control panels requiring persistent time-stamped logging under intermittent power.

For engineers reviewing the M48T35AV-10MH1E datasheet, M48T35AV-10MH1E pinout, M48T35AV-10MH1E application, or M48T35AV-10MH1E equivalent, this device serves as a JEDEC-standard 32 K × 8 SRAM drop-in replacement with integrated RTC functionality, battery-backed data retention, and deterministic power-fail switchover behavior critical for embedded systems with time-critical state preservation.

Technical Context

The M48T35AV-10MH1E integrates a 32,768 Hz quartz oscillator, BiPORT™ dual-port memory architecture, and voltage-sense switching circuitry on a single die. Its clock registers (7FF8h–7FFFh) reside in the upper 8 bytes of SRAM and are updated once per second by dedicated clock chain logic - independent of CPU access timing.

Power management is handled by a dedicated VPFD comparator (2.7–3.0 V trip range) that triggers automatic chip deselect and WRITE disable when V_CC drops below VPFD(min); battery backup engages at V_SO ≤ 2.7 V, sustaining full RTC + SRAM operation for ≥7 years. The BOK flag is latched at power-up if battery voltage falls below ~2.5 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Size	32 K × 8 = 256 Kbit SRAM with BYTEWIDE™ parallel interface
Supply Voltage	3.0–3.6 V nominal; supports stable operation across industrial voltage tolerance
RTC Accuracy	±35 ppm at 25°C (±1.53 min/month); improves to +1/–2 ppm with calibration bits
Backup Duration	≥7 years on internal 48 mAh lithium battery at T_A = 25°C
VPFD Range	2.7 V ≤ VPFD ≤ 3.0 V - defines precise write-protect activation window during brownout
Access Time	100 ns max READ cycle time - matches standard JEDEC 32 K × 8 SRAM timing
Package	PCDIP28 with integrated CAPHAT™ housing (battery + crystal)

Pinout & Package

Package: 28-pin plastic DIP (PCDIP28), 600 mil width, with integrated CAPHAT™ housing containing lithium button cell and 32.768 kHz quartz crystal.

Pin/Terminal	Circuit Role	Design Meaning
A0–A14	Address inputs	15-bit address bus for accessing all 32,768 memory locations including clock registers (7FF8h–7FFFh)
DQ0–DQ7	Data I/O	Bi-directional 8-bit data bus; carries both SRAM data and BCD time values
E	Chip enable	Active-low signal enabling memory access; controls power-fail detection sensitivity
G	Output enable	Active-low signal gating output drivers; must be high during WRITE to avoid bus contention
W	WRITE enable	Active-low signal initiating WRITE cycles; falling edge synchronizes write latch
VCC	Supply voltage	3.3 V main supply; monitored continuously for VPFD/VSO thresholds
VSS	Ground	Reference return path for both SRAM and RTC circuits

Key Features

Feature	Design Value
Integrated RTC + SRAM + battery + crystal	Single-component solution eliminates external timing components and backup power design
BCD time registers (7FF8h–7FFFh)	Direct memory-mapped access enables standard SRAM read/write protocols for timekeeping
Automatic power-fail WRITE protection	Hardware-enforced disable prevents corruption during V_CC decay within defined VPFD window
Battery OK (BOK) flag	Self-latching status bit checked at power-up; blocks first WRITE until cleared
JEDEC 32 K × 8 pin/function compatibility	Drop-in replacement for legacy SRAM sockets without PCB redesign

Applications

Industrial PLC Data Logging

Medical Device Timestamping

Use Scenario: Persistent storage of sensor readings with accurate UTC timestamps during mains power loss in programmable logic controllers.

IC Role / Device Role / Timing Role: Non-volatile SRAM + real-time clock providing synchronized timestamp generation and battery-backed memory retention.

Use Value: Ensures traceability of operational events even after extended power outages - no external RTC or backup capacitor required.

Use Scenario: Recording patient vital sign measurements with certified time stamps in portable diagnostic equipment.

IC Role / Device Role / Timing Role: Primary time source and data buffer maintaining integrity of clinical records during battery swaps or AC interruptions.

Use Value: Meets IEC 62304 requirements for time-critical medical data persistence without firmware-level clock management overhead.

Energy Meter Firmware Storage

Telecom Base Station Clock Holdover

Use Scenario: Storing tariff schedules, billing counters, and configuration parameters in smart electricity meters with tamper-resistant time stamping.

IC Role / Device Role / Timing Role: Secure, calibrated RTC + SRAM acting as trusted time anchor and configuration vault during grid instability.

Use Value: Enables revenue-grade time stamping compliant with ANSI C12.1 and IEC 62056 standards using single-chip integration.

Use Scenario: Maintaining synchronization reference during GPS signal loss in cellular infrastructure equipment.

IC Role / Device Role / Timing Role: Local holdover oscillator with temperature-compensated accuracy supporting IEEE 1588 PTP boundary clock stability.

Use Value: Delivers <±2 ppm accuracy over 0–70°C without external TCXO, reducing bill-of-materials and board space.

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile RTC+SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DS12C887-10+ (Maxim Integrated)	5 V operation only; uses external battery; no integrated crystal; 10-year data retention spec	Requires discrete crystal and battery holder; incompatible with 3.3 V systems	Select only for legacy 5 V designs needing long-term field replacement of battery/crystal
M48T35Y-10MH1E (STMicroelectronics)	Same die but SOH28 package - requires separate SNAPHAT® housing (M4T28-BR12SH1)	Enables surface-mount assembly; SNAPHAT housing inserted post-reflow to avoid thermal damage	Choose for SMT production where reflow-safe battery integration is mandatory

Compared with DS12C887-10+, the M48T35AV-10MH1E eliminates external timing components and supports 3.3 V operation; compared with M48T35Y-10MH1E, it offers turnkey through-hole deployment with factory-integrated CAPHAT™, simplifying qualification and reducing assembly steps.

Availability

M48T35AV-10MH1E is available at Aetrix Electronics and suitable for industrial control panels, medical diagnostics devices, smart energy meters, and telecom infrastructure requiring stable component supply with guaranteed long-term data retention and timekeeping integrity.

Supply support for M48T35AV-10MH1E includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, analog ICs, MEMS, and power management solutions for industrial, automotive, and consumer markets.

The TIMEKEEPER® product line targets embedded systems requiring autonomous, battery-backed timekeeping and non-volatile memory in minimal footprint - optimized for reliability in harsh environments and long service life.

FAQ

What is the function of the BOK (Battery OK) flag?

The BOK flag is an internal status bit set automatically at power-up if the integrated lithium battery voltage falls below ~2.5 V. When asserted, it blocks the first attempted WRITE to prevent corrupted data entry. The flag clears after the first successful WRITE, restoring normal operation - enabling reliable low-battery detection without external monitoring circuitry.

How does the M48T35AV-10MH1E handle leap year and month-end date corrections?

The device's internal clock logic automatically adjusts for variable month lengths (28–31 days) and leap years through 2100. These corrections occur transparently within the hardware clock chain and require no software intervention - the BCD-encoded registers (7FF9h–7FFFh) always reflect calendar-accurate values upon read, regardless of system CPU activity.

Can the integrated crystal be replaced or upgraded?

No - the CAPHAT™ DIP-28 package contains a factory-sealed, non-user-serviceable 32.768 kHz quartz crystal and lithium battery. Replacement requires full component substitution. For field-replaceable crystal/battery, select the SOH28 variant (e.g., M48T35Y-10MH1E) with compatible SNAPHAT® housing (M4T32-BR12SH6 for extended temperature range).

What is the significance of the VPFD voltage range (2.7–3.0 V)?

VPFD defines the precise voltage window where the device initiates automatic WRITE protection and chip deselect during power decay. Operation between 2.7 V and 3.0 V triggers hardware-level disable of all WRITE operations while preserving read capability - ensuring data integrity during brownout conditions before full battery switchover at V_SO ≤ 2.7 V.

M48T35AV-10MH1E Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: Timekeeper®

Package/Case:: 28-SOP (0.350", 8.89mm Width) with SNAPHAT Sockets

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Clock/Calendar

Features:: Leap Year

Memory Size:: -

Time Format:: HH:MM:SS (24 hr)

Date Format:: YY-MM-DD-dd

Interface:: Parallel

Voltage - Supply:: 3V ~ 3.6V

Voltage - Supply, Battery:: -

Current - Timekeeping (Max):: 2mA @ 3V ~ 3.6V

Operating Temperature:: 0°C ~ 70°C

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

Supplier Device Package:: 28-SOH

M48T35AV-10MH1E FAQ

1.How can I place an order for M48T35AV-10MH1E through Aetrix?

Please submit a Request for Quotation (RFQ) for M48T35AV-10MH1E on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for M48T35AV-10MH1E reliable?

The price and inventory of M48T35AV-10MH1E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48T35AV-10MH1E is usually 5 days.

3.What payment methods are accepted for M48T35AV-10MH1E?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48T35AV-10MH1E transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M48T35AV-10MH1E?

M48T35AV-10MH1E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M48T35AV-10MH1E order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for M48T35AV-10MH1E?

For technical support, including M48T35AV-10MH1E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48T35AV-10MH1E requirements.

6.How does Aetrix verify that M48T35AV-10MH1E is sourced from the original manufacturer or authorized distributors?

All M48T35AV-10MH1E products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that M48T35AV-10MH1E meets industry standards.

7.What is the process for return or replacement of M48T35AV-10MH1E?

All M48T35AV-10MH1E units undergo pre-shipment inspection (PSI). If there is an issue with M48T35AV-10MH1E, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The M48T35AV-10MH1E part is unused and in its original packaging.

Return procedure for M48T35AV-10MH1E:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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