My Inquiry
My Account
STMicroelectronics M40Z111MH6F
- Part No.:
- M40Z111MH6F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 28-SOIC (0.350", 8.89mm Width) with SNAPHAT Sockets
- Datasheet:
-
M40Z111MH6F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 28SOH
- Quantity:
- Payment:
- Shipping:
Inventory:4,378
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
M40Z111MH6F from STMicroelectronics is a 5V non-volatile RAM (NVRAM) supervisor IC that converts standard low-power SRAMs into battery-backed NVRAMs by managing power-fail detection, automatic write-protection, and seamless VCC-to-battery switchover. It supports up to two x8/x16 CMOS SRAMs, features 15ns chip enable propagation delay (at 5V), precision VPFD thresholds (4.2–4.75V selectable via THS pin), and integrates VOUT switching with <0.3V drop. Used in industrial data loggers for persistent memory retention during mains failure.
For engineers reviewing the M40Z111MH6F datasheet, M40Z111MH6F pinout, M40Z111MH6F application, or M40Z111MH6F equivalent, key selection criteria include VPFD voltage selectability (THS = VSS/VOUT), battery switchover voltage (VSO = VPFD – 100mV), ECON timing behavior during power-down/up, and SOH28 package compatibility with SNAPHAT® battery housings (M4Z28-BR00SH1/M4Z32-BR00SH1).
Technical Context
The M40Z111MH6F implements a dual-threshold power-monitoring architecture: VPFD is selected between 4.2–4.5V (THS = VOUT) or 4.5–4.75V (THS = VSS), enabling precise match to host system brown-out thresholds. Its internal analog comparator drives ECON inactive within ≤150µs of VCC crossing VPFD (min), ensuring deterministic SRAM write-protection before data corruption occurs.
VOUT is actively switched between VCC and the SNAPHAT® lithium cell at VSO = VPFD – 100mV; during backup, VOHB delivers 2.0–3.6V at ≤100µA IOUT2, sustaining SRAM data retention down to 2.0V. The device operates across –40°C to +85°C and draws only 150nA ICCDR in data retention mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Valid operating supply for industrial-grade 5V systems with margin against brown-out. |
| VPFD Threshold | 4.2–4.5V (THS = VOUT) or 4.5–4.75V (THS = VSS) - Selectable power-fail detection point to align with host MCU reset threshold. |
| ECON Propagation Delay | 15ns (tEDL) - Ensures minimal latency between SRAM CE assertion and conditioned output activation during normal operation. |
| VSO Switchover Voltage | VPFD – 100mV - Guarantees clean, glitch-free transition from VCC to battery before VCC drops below SRAM retention minimum. |
| ICCDR Data Retention Current | 150nA - Enables >10-year data retention when paired with typical LP-SRAMs drawing ≤1µA at 2.0V. |
| VOUT Switch Drop | <0.3V at 100mA - Maintains sufficient headroom for SRAM VCC pin under active load without violating minimum supply requirements. |
| Operating Temperature | –40°C to +85°C (Grade 6) - Qualified for extended industrial environments including factory automation and metering. |
Pinout & Package
Package: SOH28 - 28-lead plastic small outline (330mil width), RoHS-compliant lead-free ECOPACK®, designed for direct top-mount integration with 4-pin SNAPHAT® battery housing (e.g., M4Z28-BR00SH1). Gold-plated sockets on both ends enable reliable mechanical/electrical contact post-reflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–7, 9–14, 16–21, 23–27 | NC (Not Connected) | No internal connection; must be left floating or tied to ground per layout best practice to reduce noise coupling. |
| 8 | E (Chip Enable Input) | Direct CE input from host processor; ECON mirrors this signal during valid VCC, but overrides it during power fail. |
| 15 | THS (Threshold Select) | Binary control: tie to VSS for 4.5–4.75V VPFD, or to VOUT for 4.2–4.5V VPFD - sets switchover sensitivity. |
| 22 | ECON (Conditioned CE Output) | SRAM CE driver with automatic write-protection logic; goes high-Z/inactive when VCC falls below VPFD. |
| 24 | VOUT (Supply Output) | Switched output delivering either VCC (via low-drop switch) or battery voltage (during backup); powers SRAM VCC pin. |
| 25, 28 | VCC (Supply Input) | Main 5V system rail input; powers internal circuitry and feeds VOUT switch; monitored for VPFD detection. |
| 26 | VSS (Ground) | Primary reference for all analog comparators, digital logic, and output drivers; requires low-impedance PCB return path. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic Write-Protection Trigger | Activates ECON disable within ≤150µs of VCC crossing VPFD (min), preventing partial writes during brown-out. |
| Dual VPFD Selection | Configurable 4.2–4.5V or 4.5–4.75V trip points via single THS pin, eliminating need for external resistor dividers. |
| VOUT Low-Drop Switching | Internal MOSFET switch with <0.3V drop at 100mA ensures SRAM receives ≥4.7V from 5V rail under full load. |
| Battery Switchover Precision | VSO = VPFD – 100mV guarantees no overlap zone - VCC disconnects *before* battery engages, avoiding backfeed or shoot-through. |
| Data Retention Optimization | 150nA ICCDR enables use of off-the-shelf LP-SRAMs (e.g., IS61LV25616AL) without custom low-Icc variants. |
Applications
| Industrial Data Logger | Smart Electricity Meter |
|---|---|
|
Use Scenario: Continuous recording of energy consumption and event timestamps during grid instability or scheduled outages. IC Role / Device Role / Timing Role: NVRAM supervisor providing deterministic SRAM write-protection and battery-backed retention upon AC loss detection. Use Value: Guarantees zero data loss during sub-100ms brown-outs and enables >10-year retention using standard 48mAh SNAPHAT® (M4Z28-BR00SH1). |
Use Scenario: Storing tariff schedules, billing cycles, and tamper-event logs in utility-grade meters with mandatory 10+ year field life. IC Role / Device Role / Timing Role: Power-fail manager coordinating SRAM hold-up and secure write-disable to prevent corruption during meter firmware updates. Use Value: Meets IEC 62053-21 requirements for data integrity by enforcing tER ≥40ms recovery window after VCC restoration. |
| Railway Signaling Controller | PLC I/O Module |
|
Use Scenario: Capturing train position, speed, and safety-critical state variables in EN 5012x-certified signaling hardware. IC Role / Device Role / Timing Role: Fail-safe memory controller asserting ECON within 100µs of VCC dip to lock SRAM contents before watchdog timeout. Use Value: Supports SIL-2 functional safety by eliminating reliance on software-based save routines during power collapse. |
Use Scenario: Preserving I/O configuration, calibration tables, and last-known sensor states in modular PLC backplanes subject to hot-swap events. IC Role / Device Role / Timing Role: Hardware-enforced memory protection during module insertion/removal where VCC may sag transiently. Use Value: Prevents spurious writes during 50–200ms power transients common in DIN-rail mounted industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NVRAM supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690TCSA+ | Single fixed 4.65V VPFD; no THS-selectable threshold; 20µs tEDL; requires external diode for VCC undershoot protection. | Lacks dual-threshold flexibility and integrated VOUT switching - needs discrete MOSFET + battery path. | Choose when VPFD is fixed and board space allows discrete backup circuitry. |
| DS1230Y-120+ | Monolithic NV SRAM (128Kbit); no external SRAM support; 120ns access time; 200mA VCC standby current. | Replaces SRAM + supervisor combo but lacks scalability to larger memories or dual-SRAM configurations. | Choose only for compact, low-density (<128Kbit) applications where integration outweighs power/size trade-offs. |
Compared with MAX690TCSA+, M40Z111MH6F offers configurable VPFD and lower ICCDR (150nA vs. 1µA), extending battery life; versus DS1230Y-120+, it enables scalable memory architectures using cost-optimized LP-SRAMs instead of proprietary monolithic NV-SRAMs.
Availability
M40Z111MH6F is available at Aetrix Electronics and suitable for industrial data loggers, smart electricity meters, railway signaling controllers, and PLC I/O modules requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for M40Z111MH6F 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 analog/mixed-signal devices for industrial, automotive, and consumer markets.
The M40Z111 series belongs to ST's legacy NVRAM supervisor product line, engineered specifically to convert commodity SRAMs into robust, long-life non-volatile memory subsystems for mission-critical industrial control and metering applications.
FAQ
What is the function of the THS pin on M40Z111MH6F?
The THS (Threshold Select) pin configures the power-fail deselect voltage (VPFD) range: connecting THS to VSS selects 4.5–4.75V, while connecting to VOUT selects 4.2–4.5V. This binary choice eliminates external resistive dividers and allows precise alignment with host system reset thresholds without redesigning the supervisor interface.
Can M40Z111MH6F support more than one SRAM device?
Yes - the M40Z111MH6F is explicitly designed to supervise up to two independent low-power SRAMs. Its ECON output connects to the primary CE pin of each SRAM, and if an SRAM has a secondary CE (E2), that pin must be tied to VOUT to ensure synchronized write-protection during power failure.
Is a Schottky diode required for M40Z111MH6F operation?
A Schottky diode (e.g., 1N5817) from VCC to VSS is strongly recommended to suppress negative voltage spikes during power cycling. These spikes-up to –1V-can corrupt SRAM data in battery-backup mode; the diode clamps undershoots to ~–0.3V, staying within the device's absolute maximum rating.
How does the SNAPHAT® battery integrate with the SOH28 package?
The SOH28 package features gold-plated top-mount sockets aligned to accept 4-pin SNAPHAT® housings (e.g., M4Z28-BR00SH1 for 48mAh). The battery is inserted *after* reflow soldering to avoid thermal damage, and its keyed mechanical design prevents reverse insertion. VOUT connects directly to the battery cathode through the socket interface.
M40Z111MH6F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 28-SOIC (0.350", 8.89mm Width) with SNAPHAT Sockets
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.35V
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOH
M40Z111MH6F FAQ
1.How can I place an order for M40Z111MH6F through Aetrix?
Please submit a Request for Quotation (RFQ) for M40Z111MH6F 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 M40Z111MH6F reliable?
The price and inventory of M40Z111MH6F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M40Z111MH6F is usually 5 days.
3.What payment methods are accepted for M40Z111MH6F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M40Z111MH6F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M40Z111MH6F?
M40Z111MH6F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M40Z111MH6F 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 M40Z111MH6F?
For technical support, including M40Z111MH6F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M40Z111MH6F requirements.
6.How does Aetrix verify that M40Z111MH6F is sourced from the original manufacturer or authorized distributors?
All M40Z111MH6F 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 M40Z111MH6F meets industry standards.
7.What is the process for return or replacement of M40Z111MH6F?
All M40Z111MH6F units undergo pre-shipment inspection (PSI). If there is an issue with M40Z111MH6F, 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 M40Z111MH6F part is unused and in its original packaging.
Return procedure for M40Z111MH6F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
M40Z111MH6F Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
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…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
