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STMicroelectronics M48Z128-70PM1
- Part No.:
- M48Z128-70PM1
- Manufacturer:
- STMicroelectronics
- Category:
- Memory
- Package:
- 32-DIP Module (0.600", 15.24mm)
- Datasheet:
-
M48Z128-70PM1.pdf
- Description:
- IC NVSRAM 1MBIT PARALLEL 32PMDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,571
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Product details
Overview
M48Z128-70PM1 from STMicroelectronics is a 1 Mbit (128 K × 8) non-volatile ZEROPOWER® SRAM with integrated lithium battery, power-fail detection circuitry, and CMOS SRAM array in a 32-pin plastic DIP module. It operates at 4.75–5.5 V, provides 10-year data retention in battery backup mode, and delivers 70 ns read/write access time. It serves as a drop-in replacement for JEDEC-standard 128 K × 8 SRAMs in legacy industrial control and metering systems requiring persistent memory without external backup components.
For engineers reviewing the M48Z128-70PM1 datasheet, M48Z128-70PM1 pinout, M48Z128-70PM1 application, or M48Z128-70PM1 equivalent, key selection considerations include VPFD (4.5–4.75 V), VSO (3.0 V), tWP (40–150 µs write protect delay), and compatibility with ROM/EPROM sockets in legacy embedded systems where battery-backed RAM must survive uncontrolled power loss.
Technical Context
The device integrates a 131,072 × 8 SRAM array, voltage-sense switching circuitry, and a long-life lithium coin cell in a single PMDIP32 package. Its power-fail detection triggers automatic write protection when VCC falls below VPFD (min 4.5 V), then switches to battery power at VSO (3.0 V) to maintain data integrity.
It supports standard SRAM timing modes: READ (E low, W high, G low), WRITE (E and W active), and battery backup (VCC ≤ VSO). All I/O pins enter high-impedance state during power fail, and outputs remain undriven until tAVQV (70 ns) after address stabilization under valid enable conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128 K × 8 (1 Mbit); directly replaces JEDEC-standard 128 K × 8 SRAMs without redesign. |
| Access time | 70 ns; ensures compatibility with 14 MHz bus systems and meets timing for legacy microcontroller interfaces. |
| VCC range | 4.75–5.5 V; matches standard +5 V TTL/CMOS logic rails and tolerates typical supply ripple. |
| VPFD range | 4.5–4.75 V; defines precise voltage threshold at which chip deselect and write protection activate during brownout. |
| VSO | 3.0 V; switchover point to internal battery; guarantees data retention before system reset or shutdown. |
| Data retention | ≥10 years on internal lithium cell after first VCC application; eliminates need for external battery management. |
| ICC (active) | 105 mA; peak current during read/write; requires adequate local decoupling (0.1 µF ceramic recommended). |
| ICC (standby) | 4 mA (CMOS E); enables low-power hold mode while preserving full SRAM accessibility upon wake-up. |
Pinout & Package
PMDIP32 (32-pin plastic dual in-line package), 600 mil width, through-hole mount. Dimensions: 42.7 mm × 18.4 mm × 4.1 mm (L × W × H), lead pitch 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A16 | Address inputs | 17-bit address bus supporting full 131,072-word addressing; compatible with 80Cxx/68K/Z80 address decoding. |
| DQ0–DQ7 | Data I/O | 8-bit bidirectional data bus; three-state controlled by E and G; supports byte-wide memory mapping. |
| E | Chip enable | Active-low global enable; deactivates all outputs and disables internal array access when high. |
| G | Output enable | Active-low output control; allows read data to appear on DQ lines only when E is also low. |
| W | Write enable | Active-low write strobe; initiates write cycle when E is low; controls write timing window (tWLWH ≥ 55 ns). |
| VCC | Supply voltage | +5 V primary power input; monitored continuously for VPFD/VSO thresholds; powers SRAM and control logic. |
| VSS | Ground | Reference return path for all signals and internal battery circuit; must be low-impedance for noise immunity. |
| NC | No connect | Pins 17 and 31 are internally unconnected; must remain floating or tied to ground per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated lithium battery | Sealed, long-life coin cell pre-installed and isolated until first VCC application-no user handling or replacement required. |
| Automatic power-fail response | Hardware-level VPFD detection and tWP (40–150 µs) write protect activation prevent partial writes during brownout. |
| JEDEC pin/function compatibility | Direct replacement for standard 128 K × 8 SRAMs (e.g., HM628128, IS61LV12816) without PCB or firmware changes. |
| Socket-compatible footprint | Fits 32-pin DIP sockets used for EPROMs (e.g., 27C512) and ROMs-enables non-volatile upgrade of legacy read-only memory systems. |
| RoHS-compliant packaging | Lead-free second-level interconnect; meets EU Directive 2011/65/EU for industrial equipment with extended lifecycle requirements. |
Applications
| Industrial Programmable Logic Controllers (PLCs) | Smart Electricity Meters |
|---|---|
|
Use Scenario: Retaining configuration parameters, calibration constants, and last-known operational state during grid outages or maintenance cycles. IC Role / Device Role / Timing Role: Non-volatile memory subsystem providing immediate read/write access and guaranteed 10-year data retention without external power or firmware intervention. Use Value: Eliminates need for EEPROM wear-leveling routines or external battery management circuits-reduces BOM count and firmware complexity. |
Use Scenario: Storing tariff schedules, consumption logs, and tamper-event timestamps across multi-year deployment without battery replacement. IC Role / Device Role / Timing Role: Standalone zero-power memory node that activates backup power autonomously at 3.0 V and maintains data integrity during extended blackouts. Use Value: Meets IEC 62056-21 and ANSI C12.19 data retention mandates for revenue-grade metering without field service. |
| Legacy Medical Diagnostic Equipment | Avionics Data Recorders (EDRs) |
|
Use Scenario: Preserving fault codes, sensor calibration offsets, and last-boot diagnostics in fixed-installation imaging systems with infrequent power cycling. IC Role / Device Role / Timing Role: Pin-compatible SRAM drop-in that retains volatile settings across cold starts and unplanned shutdowns. Use Value: Avoids costly PCB redesign while meeting FDA 21 CFR Part 11 audit trail persistence requirements for Class II devices. |
Use Scenario: Capturing flight-critical telemetry snapshots prior to power loss in auxiliary avionics modules operating on shared 5 V buses. IC Role / Device Role / Timing Role: Hardware-triggered memory freeze at VPFD (4.5 V) with sub-150 µs write protect-ensures final state capture before bus collapse. Use Value: Complies with DO-160 Section 22 induced transient immunity by eliminating software-dependent save routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar non-volatile SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST M48Z128Y-70PM1 | Lower VPFD range (4.2–4.5 V) and wider VCC range (4.5–5.5 V); same package and timing. | Better suited for systems with looser 5 V rail tolerance or higher noise immunity requirements. | Select if design operates near 4.5 V nominal or requires earlier brownout response than M48Z128. |
| Maxim DS1248-120+ | 120 ns access time; 3.3 V tolerant I/O; separate VBAT pin; no integrated battery (requires external LiSOCl₂). | Requires external battery holder, voltage translation, and board space-less compact but longer shelf life. | Choose for new designs needing longer-than-10-year retention or 3.3 V system integration. |
Compared with M48Z128Y-70PM1, this part offers tighter VPFD control for stable 5 V rails but less margin for degraded supplies; compared with DS1248-120+, it trades external flexibility for turnkey integration and reduced layout risk in legacy 5 V systems.
Availability
M48Z128-70PM1 is available at Aetrix Electronics and suitable for industrial PLCs, smart electricity meters, legacy medical diagnostic equipment, and avionics data recorders requiring stable component supply across extended product lifecycles.
Supply support for M48Z128-70PM1 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 automotive, industrial, and power management ICs with strong legacy product stewardship.
M48Z128 belongs to ST's ZEROPOWER® SRAM product line, designed specifically for mission-critical industrial and metering applications where data persistence during uncontrolled power loss is non-negotiable.
FAQ
Is M48Z128-70PM1 still in production despite being "not recommended for new design"?
Yes. STMicroelectronics continues manufacturing M48Z128-70PM1 as a mature product for existing designs. It remains in active production per Doc ID 2426 Rev 6 (September 2011), with no announced discontinuance date. Aetrix Electronics maintains inventory and supports long-term supply for legacy program continuity.
What is the expected lifetime of the internal lithium battery?
The internal lithium button cell provides ≥10 years of data retention after initial VCC application, measured at 25 °C with VCC = 0 V. This value is specified in Table 10 (tDR) and confirmed in application note AN1012. Battery life is not calendar-based but accumulates only during backup operation.
Can M48Z128-70PM1 be used in surface-mount assemblies?
No. The PMDIP32 package is through-hole only. ST explicitly warns against IR reflow or wave soldering due to battery thermal sensitivity (TSLD max 260 °C for 10 s). Hand-soldering or socket mounting is mandatory per Section 3 (Maximum ratings) to avoid cell damage or venting.
How does the power-fail detection interact with simultaneous E and W transitions?
Per Figure 7 and Table 2, if E and W fall simultaneously during a write, outputs remain in high-impedance state (tWLQZ = 25–40 ns). Power-fail detection operates independently: VPFD monitoring continues regardless of control pin states, and write protection triggers within tWP (40–150 µs) after VCC crosses VPFD (min), even mid-cycle.
M48Z128-70PM1 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:
- 1Mbit
- Memory Organization:
- 128K 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
M48Z128-70PM1 FAQ
1.How can I place an order for M48Z128-70PM1 through Aetrix?
Please submit a Request for Quotation (RFQ) for M48Z128-70PM1 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 M48Z128-70PM1 reliable?
The price and inventory of M48Z128-70PM1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M48Z128-70PM1 is usually 5 days.
3.What payment methods are accepted for M48Z128-70PM1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M48Z128-70PM1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M48Z128-70PM1?
M48Z128-70PM1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M48Z128-70PM1 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 M48Z128-70PM1?
For technical support, including M48Z128-70PM1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M48Z128-70PM1 requirements.
6.How does Aetrix verify that M48Z128-70PM1 is sourced from the original manufacturer or authorized distributors?
All M48Z128-70PM1 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 M48Z128-70PM1 meets industry standards.
7.What is the process for return or replacement of M48Z128-70PM1?
All M48Z128-70PM1 units undergo pre-shipment inspection (PSI). If there is an issue with M48Z128-70PM1, 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 M48Z128-70PM1 part is unused and in its original packaging.
Return procedure for M48Z128-70PM1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M48Z128-70PM1 Tags
-
M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
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24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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