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Home > Products > Integrated Circuits (ICs) > Memory > Memory

STMicroelectronics M48Z512A-70PM1

Name: M48Z512A-70PM1
Brand: STMicroelectronics
SKU: M48Z512A-70PM1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: M48Z512A-70PM1

Manufacturer:: STMicroelectronics

Category:: Memory

Package:: 32-DIP Module (0.600", 15.24mm)

Datasheet:: M48Z512A-70PM1.pdf

Description:: IC NVSRAM 4MBIT PARALLEL 32PMDIP

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Product details

Overview

M48Z512A-70PM1 from STMicroelectronics is a non-volatile 4 Mbit (512 K × 8) ZEROPOWER® SRAM with integrated lithium battery, power-fail detection circuitry, and automatic write protection. It operates as a standard JEDEC-compatible SRAM under V_CC = 4.75–5.5 V, provides 10-year data retention in battery backup mode, and features VPFD = 4.5–4.75 V for power-fail deselect. Used in industrial control modules requiring persistent memory during brownouts.

For engineers reviewing the M48Z512A-70PM1 datasheet, M48Z512A-70PM1 pinout, M48Z512A-70PM1 application, or M48Z512A-70PM1 equivalent, key selection criteria include its 70 ns access time, PMDIP32 through-hole package, dual-mode operation (active SRAM / battery-retention), and precise V_CC-monitored write protection timing.

Technical Context

The device integrates a CMOS SRAM array, voltage-sense switching circuitry, and a sealed lithium coin cell in a single 32-pin DIP module. Its control logic continuously monitors V_CC; when voltage drops below VPFD (4.5–4.75 V), it asserts chip deselect and write protection within 40–150 µs (t_WPT), then switches to battery power at V_SO = 3.0 V.

It supports conventional asynchronous SRAM timing: READ cycles require t_AVQV ≤ 70 ns and t_ELQV ≤ 70 ns; WRITE cycles require t_WLWH ≥ 55 ns and t_DVWH ≥ 30 ns before W high. All I/Os are TTL/CMOS compatible with V_IL ≤ 0.8 V and V_IH ≥ 2.2 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	4,194,304 bits (524,288 × 8), byte-wide organization compatible with legacy 512K×8 SRAM sockets
Access time	70 ns max - enables direct replacement of standard 70 ns SRAMs without timing redesign
V_CC range	4.75–5.5 V - supports +5 V systems with ±5% tolerance; excludes 3.3 V variants
VPFD threshold	4.5–4.75 V - triggers automatic write protect and high-Z outputs before data corruption occurs
Data retention	≥10 years on internal battery - no external backup power or EEPROM emulation required
Package	PMDIP32 - 32-pin plastic DIP with ECOPACK® RoHS-compliant lead-free interconnects
Operating temp	0 to 70 °C (Grade 1) - validated for commercial/industrial ambient environments

Pinout & Package

PMDIP32 (32-pin plastic DIP module) with 0.3" wide body, 2.54 mm pitch, and ECOPACK® RoHS compliance. Internal battery isolated until V_CC applied; no external battery connections required.

Pin/Terminal	Circuit Role	Design Meaning
A0–A18	Address inputs	19-bit address bus supporting full 524,288-word addressing; TTL/CMOS compatible
DQ0–DQ7	Data I/O	8-bit bidirectional data bus with three-state outputs controlled by E and G
E	Chip enable	Active-low enable; controls device selection and output enable in conjunction with G
G	Output enable	Active-low output control; allows read data gating independent of chip select
W	Write enable	Active-low write strobe; initiates write cycle with E; must meet t_WLWH ≥ 55 ns
V_CC	Power supply	+5 V nominal supply; monitored for VPFD/V_SO thresholds; bypass capacitor required
V_SS	Ground	Reference return path for all signals and internal battery circuitry

Key Features

Feature	Design Value
Integrated battery + SRAM + control	Single-module solution eliminates external backup power design, PCB layout, and qualification effort
Automatic power-fail response	Hardware-level VPFD detection and t_WPT-timed write protect prevent corruption during uncontrolled V_CC collapse
JEDEC pin/function compatibility	Drop-in replacement for standard 512K×8 SRAMs-no board or firmware changes needed
Unlimited write endurance	Conventional SRAM core enables infinite writes-no wear leveling or erase cycles required
Battery isolation	Lithium cell remains electrically disconnected until first V_CC application, preserving shelf life

Applications

Industrial PLC Data Logger

Medical Device Configuration Store

Use Scenario: Retains real-time sensor calibration and fault history during AC mains loss or battery swap in programmable logic controllers.

IC Role / Device Role / Timing Role: Non-volatile SRAM providing immediate-read/write access and guaranteed 10-year retention without software overhead.

Use Value: Eliminates need for EEPROM write delays or flash wear management; maintains deterministic response during power transitions.

Use Scenario: Stores patient-specific therapy parameters and usage logs in portable infusion pumps where regulatory traceability requires immutable settings.

IC Role / Device Role / Timing Role: Pin-compatible memory holding critical configuration data across power cycles and sterilization events.

Use Value: Meets IEC 62304 data integrity requirements via hardware-enforced write protection during brownout.

Point-of-Sale Terminal Transaction Buffer

Telecom Base Station Clock Backup

Use Scenario: Caches last transaction ID and receipt data during brief utility outages in retail terminals to prevent duplicate or lost sales records.

IC Role / Device Role / Timing Role: High-speed SRAM with sub-150 µs write protect activation ensures atomic commit before power loss.

Use Value: Avoids database reconciliation and manual audit; satisfies PCI-DSS logging continuity mandates.

Use Scenario: Preserves oscillator trim values and sync state in cellular base station timing cards during generator switchover or grid instability.

IC Role / Device Role / Timing Role: Low-leakage standby mode (I_CC1 = 10 mA) minimizes battery drain while maintaining nanosecond-level timing accuracy.

Use Value: Enables <100 ns phase holdover per ITU-T G.8262, avoiding network synchronization alarms.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
Maxim MAX6900	Serial I²C interface; 64 Kbit capacity; no integrated battery - requires external backup	Lower pin count but slower interface; unsuitable for high-throughput SRAM replacement	Select only if system already uses I²C and data volume is ≤64 Kbit
ON Semiconductor CAT1162	EEPROM + supervisor IC; 64 Kbit; 100 k-cycle endurance; no SRAM speed or unlimited writes	Designed for infrequent parameter storage, not real-time buffer use	Choose only for static configuration storage where write latency is acceptable

Compared with MAX6900 and CAT1162, M48Z512A-70PM1 uniquely delivers parallel-byte SRAM speed, unlimited writes, and fully integrated battery-backed retention - making it irreplaceable for applications demanding both performance and persistence without firmware intervention.

Availability

M48Z512A-70PM1 is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, point-of-sale terminals, and telecom infrastructure requiring stable component supply despite its "not recommended for new design" status.

Supply support for M48Z512A-70PM1 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, specializing in microcontrollers, power management, sensors, and memory solutions for industrial, automotive, and consumer markets.

M48Z512A belongs to ST's ZEROPOWER® RAM product line, engineered specifically to replace volatile SRAMs in systems needing seamless, hardware-governed non-volatility without sacrificing access speed or write endurance.

FAQ

Is M48Z512A-70PM1 still in production?

Yes, M48Z512A-70PM1 remains in active production per STMicroelectronics' official documentation (Doc ID 5146 Rev 9, June 2011), though it is marked "not recommended for new designs." Aetrix Electronics maintains verified stock and supports long-term supply for legacy system maintenance and repair.

What is the expected battery lifetime after initial power-up?

The internal lithium battery guarantees ≥10 years of data retention when V_CC is absent and ambient temperature remains within –40 to +85 °C. This value is measured under specified conditions (t_DR, Table 10) and does not degrade with repeated power cycles - retention time begins upon first V_CC application.

Can M48Z512A-70PM1 operate at 3.3 V?

No. M48Z512A-70PM1 is rated exclusively for V_CC = 4.75–5.5 V. The 3.3 V variant is the M48Z512AV series (e.g., M48Z512AV-85PM1), which has different VPFD (2.8–3.0 V) and V_SO (2.5 V) thresholds and is not pin- or voltage-compatible.

Does this device require external decoupling or protection components?

Yes. A 0.1 µF ceramic bypass capacitor between V_CC and V_SS is mandatory per Figure 8. Additionally, ST recommends a Schottky diode (e.g., 1N5817) from V_CC to V_SS to suppress negative transients that could corrupt data during battery backup mode.

M48Z512A-70PM1 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: 32-DIP Module (0.600", 15.24mm)

Packaging:: Tube

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Non-Volatile

Memory Format:: NVSRAM

Technology:: NVSRAM (Non-Volatile SRAM)

Memory Size:: 4Mbit

Memory Organization:: 512K x 8

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 70ns

Access Time:: 70 ns

Voltage - Supply:: 4.75V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 32-PMDIP Module

M48Z512A-70PM1 FAQ

1.How can I place an order for M48Z512A-70PM1 through Aetrix?

Please submit a Request for Quotation (RFQ) for M48Z512A-70PM1 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 M48Z512A-70PM1 reliable?

The price and inventory of M48Z512A-70PM1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48Z512A-70PM1 is usually 5 days.

3.What payment methods are accepted for M48Z512A-70PM1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48Z512A-70PM1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for M48Z512A-70PM1?

M48Z512A-70PM1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your M48Z512A-70PM1 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 M48Z512A-70PM1?

For technical support, including M48Z512A-70PM1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48Z512A-70PM1 requirements.

6.How does Aetrix verify that M48Z512A-70PM1 is sourced from the original manufacturer or authorized distributors?

All M48Z512A-70PM1 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 M48Z512A-70PM1 meets industry standards.

7.What is the process for return or replacement of M48Z512A-70PM1?

All M48Z512A-70PM1 units undergo pre-shipment inspection (PSI). If there is an issue with M48Z512A-70PM1, 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 M48Z512A-70PM1 part is unused and in its original packaging.

Return procedure for M48Z512A-70PM1:

1.Submit a request within 90 days.

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

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