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Renesas M51954AL#TF0J
- Part No.:
- M51954AL#TF0J
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
M51954AL#TF0J.pdf
- Description:
- IC SUPERVISOR VOLT DET SYS RESET
- Quantity:
- Payment:
- Shipping:
Inventory:19,271
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Product details
Overview
M51954AL#TF0J from Renesas Electronics is an H-type (active-high) voltage-detecting system reset IC designed for microcomputer and logic circuit supervision. It operates across 2 V to 17 V supply, features a 4.25 V detection threshold (±0.2 V), delivers 3.4 ms typical delay with 0.01 µF external capacitor, and uses open-collector output for flexible reset signal interfacing in embedded power management.
For engineers reviewing the M51954AL#TF0J datasheet, M51954AL#TF0J pinout, M51954AL#TF0J application, or M51954AL#TF0J equivalent, key selection criteria include its fixed 4.25 V detection level, temperature-stable hysteresis (50 mV typ), low 420 µA operating current at 5 V, and compatibility with standard 8-pin SOP packages including PRSP0008DE-C.
Technical Context
The M51954AL#TF0J implements a precision comparator with internal 1.25 V reference and resistor divider to detect supply voltage crossing 4.25 V. Its open-collector output requires external pull-up and sinks up to 4 mA while maintaining ≤0.4 V saturation voltage at 5 V supply.
A dedicated delay capacitor terminal draws –5 µA typical constant current to generate programmable reset assertion time; delay scales linearly as tpd ≈ 0.34 × Cd (pF) µs, supporting 1.6–7 ms range with 4700 pF–10 µF capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 4.25 V (typ), ±0.2 V tolerance - sets precise reset trigger point for 5 V logic rails |
| Hysteresis | 50 mV (typ) - prevents chatter during slow-rising/falling supply transitions |
| Supply Range | 2 V to 17 V - supports wide-input industrial and automotive auxiliary rails |
| Delay Time | 3.4 ms (typ) at Cd = 0.01 µF - provides reliable power-on reset timing without internal RC |
| Output Type | Open-collector - enables wired-OR reset buses and level-shifting with external pull-up |
| Operating Current | 420 µA (typ) at VCC = 5 V - minimizes quiescent load on battery-backed or low-power supplies |
| Threshold Operating Voltage | 0.55 V (typ) - ensures functional operation down to brown-out conditions before full reset asserts |
Pinout & Package
Package: 8-pin SOP (PRSP0008DE-C), recommended per datasheet; PRSP0008DA-A is explicitly marked "not recommend for new design".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Open-collector reset output - must be pulled up externally; asserts high when VCC ≥ 4.25 V |
| 2 | GND | Ground reference - common return for internal circuitry and delay capacitor |
| 3 | Power-supply | VCC input - supplies internal comparator, reference, and delay current source |
| 4 | NC | No connection - internally unconnected; leave floating or grounded per layout best practice |
| 5 | Delay capacitor | Current-sink node - connects external capacitor to generate reset delay via linear charge/discharge |
| 6–8 | NC | No connection - unused pins; no internal bonding; treat as floating |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 4.25 V detection threshold | Eliminates external resistor network - reduces BOM count and layout area for standard 5 V systems |
| External capacitor-programmable delay | Enables precise reset timing tuning from 1.6 ms to >10 s using standard ceramic or tantalum capacitors |
| Low 0.55 V minimum operating voltage | Guarantees functional reset assertion even during deep brown-out, prior to complete power collapse |
| Wide 2–17 V supply range | Supports direct interface to unregulated inputs, DC/DC outputs, and multi-rail embedded systems |
| 50 mV typical hysteresis | Prevents false resets during noisy or slowly recovering power rails without requiring external Schmitt triggers |
Applications
| Microcontroller Power-On Reset | Battery Voltage Monitoring |
|---|---|
|
Use Scenario: Ensuring deterministic startup of 8-bit and 16-bit MCUs after power application or wake-from-sleep. IC Role / Device Role / Timing Role: Active-high reset generator asserting clean, capacitor-delayed signal to MCU RESET pin until VCC stabilizes above 4.25 V. Use Value: Prevents code execution from corrupted memory or unstable clock domains by guaranteeing ≥3.4 ms reset pulse width at nominal conditions. |
Use Scenario: Detecting end-of-life or fault condition in 3.7 V Li-ion or 9 V alkaline battery packs. IC Role / Device Role / Timing Role: Threshold comparator triggering LED indicator or system shutdown when pack voltage drops below 4.25 V under load. Use Value: Leverages built-in hysteresis to avoid flickering alerts during transient load spikes, improving user experience and battery utilization. |
| DC/DC Converter Supervision | Industrial Logic Circuit Reset |
|
Use Scenario: Validating stable output from isolated or non-isolated DC/DC modules before enabling downstream FPGAs or ADCs. IC Role / Device Role / Timing Role: Secondary-side reset monitor verifying regulated 5 V or 12 V rail integrity before releasing hold-off signals. Use Value: Uses wide 2–17 V input range to directly sense converter output without level-shifting, reducing component count and failure points. |
Use Scenario: Synchronizing reset across multiple CMOS logic families (e.g., 74HC, CD4000) in PLC I/O modules. IC Role / Device Role / Timing Role: Centralized reset supervisor driving shared active-high reset bus with open-collector wired-OR capability. Use Value: Enables modular design where each logic section pulls up its own segment of the bus, simplifying fault isolation and board-level test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-detecting reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3808G33DBVR | 3.3 V fixed detection, 200 ms factory-programmed delay, push-pull output | Requires PCB redesign for different threshold and non-adjustable timing; better for space-constrained designs | Select when fixed 3.3 V rail monitoring and guaranteed long delay are prioritized over adjustability |
| MAX6326UR31D3+ | 3.08 V detection, 140 ms min delay, SOT-23-3 package, no external capacitor needed | Lacks programmable delay and wide supply range; suited for compact, cost-sensitive consumer electronics | Choose for minimal footprint and zero external components where 3.08 V threshold matches system requirements |
Compared with TPS3808G33DBVR and MAX6326UR31D3+, the M51954AL#TF0J offers field-tunable reset timing via external capacitor, wider 2–17 V operation, and higher 4.25 V threshold-making it optimal for legacy industrial systems requiring precise 5 V rail supervision and flexible delay configuration.
Availability
M51954AL#TF0J is available at Aetrix Electronics and suitable for industrial control panels, battery-powered instrumentation, and legacy automotive body electronics requiring stable component supply and long-term obsolescence support.
Supply support for M51954AL#TF0J 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
Renesas Electronics Corporation is a global semiconductor leader specializing in microcontrollers, analog, power, and SoC solutions for automotive, industrial, and enterprise applications.
The M51954AL#TF0J belongs to Renesas' legacy Voltage Detecting, System Resetting IC Series, engineered for robust power-supply monitoring and deterministic reset generation in cost-sensitive, high-reliability embedded systems.
FAQ
What is the detection voltage accuracy of the M51954AL#TF0J?
The M51954AL#TF0J has a detection voltage of 4.25 V (typical), with a guaranteed range of 4.05 V to 4.45 V at 25°C. This ±0.2 V tolerance ensures reliable reset activation across process and temperature variations. The device also provides 50 mV typical hysteresis to prevent oscillation near the threshold. These specifications are fully characterized and validated per the REJ03D0776-0300 datasheet.
Can the M51954AL#TF0J be used with a 3.3 V supply rail?
Yes, the M51954AL#TF0J supports supply voltages from 2 V to 17 V, so it operates correctly with a 3.3 V rail. However, its 4.25 V detection threshold means it will not assert reset on a nominal 3.3 V system - it is intended for 5 V or higher rails. For 3.3 V supervision, consider alternative reset ICs with lower thresholds; the M51954AL#TF0J remains functional but inactive unless VCC exceeds 4.25 V.
What package options are supported for the M51954AL#TF0J?
The M51954AL#TF0J is specified in the 8-pin SOP package PRSP0008DE-C, which Renesas explicitly recommends for new designs. The older PRSP0008DA-A (8P2S-A) variant is marked "not recommend for new design" due to thermal and reliability considerations. Both share the same pinout, but only PRSP0008DE-C is supported for current production and long-term availability.
How is the reset delay time set on the M51954AL#TF0J?
The M51954AL#TF0J uses an external capacitor connected to the Delay capacitor pin (Pin 5) to set reset delay. A constant current of –5 µA (typ) charges the capacitor, generating tpd ≈ 0.34 × Cd (pF) µs. With a 0.01 µF capacitor, typical delay is 3.4 ms. Capacitor values between 4700 pF and 10 µF are supported, enabling delays from ~1.6 ms to several seconds depending on capacitance and temperature.
Is the M51954AL#TF0J suitable for automotive applications?
The M51954AL#TF0J is rated for –30°C to +85°C operating temperature and classified as "Standard" quality grade per Renesas documentation, intended for industrial and commercial equipment-not automotive safety-critical systems. It lacks AEC-Q100 qualification and is not recommended for engine control, ADAS, or other automotive applications where extended temperature, vibration, or functional safety compliance is required. Use only in non-safety automotive subsystems with explicit customer validation.
M51954AL#TF0J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
M51954AL#TF0J FAQ
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7.What is the process for return or replacement of M51954AL#TF0J?
All M51954AL#TF0J units undergo pre-shipment inspection (PSI). If there is an issue with M51954AL#TF0J, 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 M51954AL#TF0J part is unused and in its original packaging.
Return procedure for M51954AL#TF0J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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