My Inquiry
My Account
STMicroelectronics M48Z35-70PC1
- Part No.:
- M48Z35-70PC1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 28-DIP Module (0.600", 15.24mm)
- Datasheet:
-
M48Z35-70PC1.pdf
- Description:
- IC NVSRAM 256KBIT PAR 28PCDIP
- Quantity:
- Payment:
- Shipping:
Inventory:344
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M48Z35-70PC1 from STMicroelectronics is a 256 Kbit (32 K × 8) non-volatile ZEROPOWER® SRAM with integrated lithium battery, power-fail detection, and automatic write protection. It operates at 4.75–5.5 V, features 70 ns read/write cycle time, and retains data for ≥11 years on internal battery during power loss. Used in industrial control panels for real-time parameter storage during brownouts.
For engineers reviewing the M48Z35-70PC1 datasheet, M48Z35-70PC1 pinout, M48Z35-70PC1 application, or M48Z35-70PC1 equivalent, key selection criteria include VPFD window (4.5–4.75 V), CAPHAT™ DIP-28 integration, battery-backed data retention without external circuitry, and JEDEC 32K×8 SRAM compatibility for ROM/EPROM socket replacement.
Technical Context
The M48Z35-70PC1 integrates a 32 K × 8 static RAM array, voltage-sense switching circuitry, and a lithium button cell into a monolithic die housed in a CAPHAT™ 28-pin PDIP package. Its power-fail logic monitors VCC continuously and initiates write protection when voltage drops into the 4.5–4.75 V VPFD window.
Upon VCC falling below 3.0 V (VSO), the device seamlessly switches to internal battery power while maintaining high-impedance I/Os and preserving all stored data. The architecture supports ripple-through read access and requires no special write timing-functionally identical to standard JEDEC SRAMs but with inherent non-volatility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 256 Kbit (32 K × 8); provides byte-wide interface compatible with legacy microcontroller address/data buses. |
| Access time | 70 ns; matches standard 32K×8 SRAM timing, enabling drop-in replacement in existing designs. |
| VCC range | 4.75–5.5 V; ensures stable operation across industrial 5 V rails with ±5% tolerance. |
| VPFD window | 4.5–4.75 V; triggers automatic chip deselect and write protection before system-level data corruption occurs. |
| VSO threshold | 3.0 V; initiates battery switchover to preserve data integrity during deep brownouts or complete power loss. |
| Battery life | ≥11 years at 25 °C; eliminates need for periodic battery replacement in sealed industrial equipment. |
| Operating temp | 0 to 70 °C; validated for use in commercial and industrial control environments without derating. |
Pinout & Package
Package: 28-pin plastic DIP (PDIP 28.7) with integrated CAPHAT™ battery housing - fully self-contained, no external battery or backup circuitry required.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address inputs | 15-bit address bus supporting full 32 Kbyte addressing; compatible with standard 8-bit microcontroller address latches. |
| DQ0–DQ7 | Data I/O | Bi-directional 8-bit data bus with three-state outputs controlled by E and G; supports shared system data bus. |
| E | Chip enable | Active-low enable; places device in standby (high-Z) when high; required low for read/write access. |
| G | Output enable | Active-low output control; enables data output only when E is also low; prevents bus contention. |
| W | Write enable | Active-low write strobe; initiates write cycle when E and W both low; defines write timing window. |
| VCC | Power supply | Primary 5 V supply input; monitored for power-fail detection; powers SRAM and control logic. |
| VSS | Ground | System reference ground; must be low-impedance connection to prevent noise-induced VPFD mis-triggering. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated CAPHAT™ package | Single-component solution with embedded lithium battery - eliminates PCB space, assembly steps, and external backup circuit design. |
| Automatic power-fail response | Hardware-level VPFD detection and write protection activation within defined voltage window - no firmware or external supervisor IC needed. |
| JEDEC 32K×8 compatibility | Pins and functions match industry-standard SRAMs - enables direct socket replacement in ROM/EPROM-based systems without layout changes. |
| Zero external timing constraints | No special write pulse widths or setup/hold requirements beyond standard SRAM timing - simplifies controller interface design. |
| Lithium battery isolation | CAPHAT™ mechanical design prevents thermal damage during wave soldering - allows safe through-hole assembly without battery removal. |
Applications
| Industrial PLC Data Logging | Medical Device Configuration Storage |
|---|---|
|
Use Scenario: Retaining calibration coefficients and alarm thresholds in programmable logic controllers during utility grid interruptions. IC Role / Device Role / Timing Role: Non-volatile memory buffer that maintains critical operational parameters without external power or software intervention. Use Value: Ensures deterministic restart after brownout with zero data loss - avoids recalibration delays and production downtime. |
Use Scenario: Storing patient-specific therapy settings in infusion pumps where power loss must not erase treatment profiles. IC Role / Device Role / Timing Role: Battery-backed SRAM providing immediate, glitch-free data retention upon main power failure. Use Value: Meets IEC 62304 safety requirements for persistent configuration storage without firmware dependency or EEPROM wear-out concerns. |
| Point-of-Sale Terminal Transaction Buffer | Energy Meter Firmware Parameter Backup |
|
Use Scenario: Holding incomplete transaction records in retail terminals during brief AC outages to prevent financial data loss. IC Role / Device Role / Timing Role: High-speed, byte-accessible memory acting as atomic write buffer with hardware-enforced write protection. Use Value: Guarantees ACID-compliant transaction persistence without complex journaling or flash translation layers. |
Use Scenario: Preserving tariff schedules and metering constants in smart electricity meters exposed to frequent grid fluctuations. IC Role / Device Role / Timing Role: Long-life non-volatile storage element immune to write-cycle endurance limits of flash or EEPROM. Use Value: Delivers >11-year data retention at room temperature - exceeds 10-year utility certification requirements with margin. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery-backed SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Maxim MAX6900 | Serial I²C interface; 64 Kbit; external battery required; no integrated CAPHAT™ package. | Requires additional level-shifting and firmware drivers; unsuitable for parallel-bus legacy systems. | Select only if board space is constrained and serial interface is already used in system architecture. |
| ON Semiconductor CAT1162 | Serial SPI EEPROM + supervisor; 64 Kbit; no SRAM functionality; relies on EEPROM write endurance (1M cycles). | Slower write speed; limited write cycles; no true SRAM performance or byte-write immediacy. | Choose only for cost-sensitive, low-write-frequency applications where SRAM speed is unnecessary. |
Compared with MAX6900 and CAT1162, the M48Z35-70PC1 delivers parallel-byte SRAM performance with zero external components, eliminating interface overhead and endurance limitations - making it optimal for legacy industrial systems requiring plug-compatible, high-reliability non-volatile memory.
Availability
M48Z35-70PC1 is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, point-of-sale terminals, and smart energy meters requiring stable component supply with long-term lifecycle support.
Supply support for M48Z35-70PC1 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 analog, MCU, power, and memory solutions for industrial, automotive, and consumer markets.
The M48Z35 belongs to ST's ZEROPOWER® SRAM product line, engineered specifically for applications demanding seamless, hardware-governed non-volatility in 5 V systems - prioritizing reliability over density or speed.
FAQ
What is the battery chemistry and expected service life of the M48Z35-70PC1?
The M48Z35-70PC1 uses a non-rechargeable lithium carbon monofluoride (LiCFₓ) button cell integrated into its CAPHAT™ DIP package. At 25 °C and VCC = 0 V, it guarantees ≥11 years of data retention. Service life scales inversely with ambient temperature and battery self-discharge; actual field life exceeds 10 years in typical industrial enclosures.
Can the M48Z35-70PC1 be used in surface-mount designs?
No - the M48Z35-70PC1 is exclusively offered in the 28-pin PDIP CAPHAT™ package, designed for through-hole mounting. ST does not offer a surface-mount variant of this specific part number. For SMT-compatible battery-backed SRAM, consider the M48Z35Y-70MH1F in SOH28 with separate SNAPHAT® top (M4Z28-BR00SH1), which requires post-reflow assembly.
How does the VPFD voltage window affect system-level power supply design?
The M48Z35-70PC1's VPFD window (4.5–4.75 V) defines the voltage band where automatic write protection activates. System designers must ensure the 5 V rail falls cleanly through this window - avoiding noise-induced false triggers - by using ≥0.1 µF ceramic decoupling per device and minimizing VCC trace inductance. Undershoot below –0.3 V during backup mode is strictly prohibited.
Is the M48Z35-70PC1 RoHS compliant and lead-free?
Yes - the M48Z35-70PC1 is RoHS compliant and features lead-free second-level interconnects. Its PDIP package meets ECOPACK2 environmental standards. The integrated lithium battery is fully encapsulated and exempt from RoHS heavy metal restrictions under Annex II exemption 7a, as confirmed in ST's official environmental documentation (DocID02608 Rev 12, Section 8).
M48Z35-70PC1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-DIP Module (0.600", 15.24mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- NVSRAM
- Technology:
- NVSRAM (Non-Volatile SRAM)
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K 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:
- 28-PCDIP, CAPHAT®
M48Z35-70PC1 FAQ
1.How can I place an order for M48Z35-70PC1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M48Z35-70PC1 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 M48Z35-70PC1 reliable?
The price and inventory of M48Z35-70PC1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48Z35-70PC1 is usually 5 days.
3.What payment methods are accepted for M48Z35-70PC1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48Z35-70PC1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M48Z35-70PC1?
M48Z35-70PC1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M48Z35-70PC1 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 M48Z35-70PC1?
For technical support, including M48Z35-70PC1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48Z35-70PC1 requirements.
6.How does Aetrix verify that M48Z35-70PC1 is sourced from the original manufacturer or authorized distributors?
All M48Z35-70PC1 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 M48Z35-70PC1 meets industry standards.
7.What is the process for return or replacement of M48Z35-70PC1?
All M48Z35-70PC1 units undergo pre-shipment inspection (PSI). If there is an issue with M48Z35-70PC1, 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 M48Z35-70PC1 part is unused and in its original packaging.
Return procedure for M48Z35-70PC1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M48Z35-70PC1 Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
