STMicroelectronics M48Z35Y-70PC1

Overview

M48Z35Y-70PC1 from STMicroelectronics is a 256 Kbit (32 K × 8) non-volatile zero-power SRAM with integrated lithium battery, power-fail detection circuitry, and automatic write protection. It operates at 4.5–5.5 V, features 70 ns read/write cycle time, VPFD of 4.2–4.5 V, and delivers ≥11 years data retention in battery backup mode. Used in industrial control panels for real-time parameter storage during AC mains failure.

For engineers reviewing the M48Z35Y-70PC1 datasheet, M48Z35Y-70PC1 pinout, M48Z35Y-70PC1 application, or M48Z35Y-70PC1 equivalent, key selection considerations include VCC operating range compatibility, VPFD threshold alignment with system brown-out detection, battery-backed retention duration, and CAPHAT™ DIP package integration versus SOIC+SNAPHAT® assembly requirements.

Technical Context

The M48Z35Y integrates a 32 K × 8 SRAM array, voltage-sense comparator, battery switchover logic, and lithium cell into a monolithic die. Its power-fail circuit monitors VCC continuously and asserts write protection when voltage drops into the 4.2–4.5 V VPFD window, then switches to battery power below 3.0 V (VSO).

It supports JEDEC-standard SRAM timing: tAVQV = 70 ns, tELQV = 70 ns, tGLQV = 35 ns (CL = 100 pF), and maintains high-impedance outputs during power transition. The device enters data retention mode autonomously-no external control signals required-and resumes normal operation after VCC recovers above VPFD(max) with 40–200 ms recognition delay (trec).

Key Specifications

Pinout & Package

Package: 28-pin PDIP (CAPHAT™), 600 mil width, with integrated lithium button cell. Dimensions: 39.37 mm × 17.83 mm × 9.27 mm (L × W × H). RoHS-compliant, lead-free second-level interconnect.

Key Features

Applications

Equivalent & Alternatives

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

Compared with M48Z35-70PC1, the M48Z35Y-70PC1 offers wider VCC tolerance (4.5–5.5 V vs. 4.75–5.5 V) and lower VPFD threshold (4.2–4.5 V), making it more robust in noisy or aging 5 V supplies; compared with DS1248, it reduces bill-of-materials by integrating battery and control logic into one DIP package.

Availability

M48Z35Y-70PC1 is available at Aetrix Electronics and suitable for industrial control panels, medical event loggers, point-of-sale terminals, and smart energy meters requiring stable component supply across multi-year production cycles.

Supply support for M48Z35Y-70PC1 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, power management ICs, sensors, and memory solutions for industrial, automotive, and consumer markets.

The M48Z35Y belongs to ST's ZEROPOWER® SRAM product line-engineered specifically for applications demanding autonomous, long-term data retention without external supervision or auxiliary power circuitry.

FAQ

What is the battery chemistry and expected service life of the integrated CAPHAT™ cell?

The M48Z35Y-70PC1 contains a non-rechargeable lithium carbon monofluoride (LiCFₓ) button cell rated for ≥11 years of data retention at 25 °C with VCC = 0 V. Actual field life depends on ambient temperature and cumulative time spent in battery mode; ST specifies 10 years minimum per Table 6, with extended life possible at lower temperatures.

Can the M48Z35Y-70PC1 be used in surface-mount assemblies?

No-the M48Z35Y-70PC1 is supplied only in the 28-pin PDIP CAPHAT™ package with integrated battery and is not qualified for reflow soldering. ST explicitly cautions against wave or IR reflow due to battery thermal damage risk. For SMT use, select the SOIC variant M48Z35Y-70MH1F paired with separate SNAPHAT® top M4Z28-BR00SH1.

How does the VPFD window affect system-level brown-out detection design?

The 4.2–4.5 V VPFD window must be coordinated with the host system's brown-out detector (BOD) threshold. To avoid race conditions, the BOD should trigger reset or suspend activity at ≥4.6 V-above VPFD(max)-so the M48Z35Y enters write-protected mode before system logic becomes unreliable. Decoupling is mandatory to suppress transients that could falsely trigger VPFD.

Is the M48Z35Y-70PC1 compliant with modern environmental regulations?

Yes-the device is RoHS-compliant and features lead-free second-level interconnects. The integrated lithium battery is fully encapsulated and must be recycled per local regulations (IEC 62133, UN 3090). ST provides recycling symbols and disposal guidance in Section 8 of the datasheet; no hazardous substance exemptions apply.