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Renesas M51955BL#TF0J
- Part No.:
- M51955BL#TF0J
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
M51955BL#TF0J.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
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Inventory:108,023
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Product details
Overview
M51955BL#TF0J from Renesas Electronics is a low-power, adjustable-voltage system reset IC with open-collector output and built-in 200 µs delay, designed for monitoring supply rails in microcomputer and logic circuits. It operates across 2 V to 17 V, detects at 1.25 V (±5%), supports external resistor-based threshold setting, and delivers reliable reset assertion during brownout conditions in embedded control systems.
For engineers reviewing the M51955BL#TF0J datasheet, M51955BL#TF0J pinout, M51955BL#TF0J application, or M51955BL#TF0J equivalent, key selection considerations include its L-reset (active-low) logic polarity, open-collector output configuration requiring external pull-up, −30°C to +85°C operating range, and compatibility with battery-backed and DC/DC converter supervision tasks.
Technical Context
The M51955BL#TF0J implements a precision voltage comparator with 1.25 V internal reference and 15 mV typical hysteresis to prevent chatter near threshold. Its input stage draws only 100 nA, enabling high-impedance external resistor dividers for flexible detection voltage setting between 2 V and 15 V.
A monolithic delay capacitor provides fixed 200 µs (typ) reset pulse width after threshold violation. The open-collector output supports rail-to-rail compatibility up to 18 V absolute max, with 0.2 V saturation voltage at 4 mA sink current - suitable for driving TTL/CMOS inputs or discrete transistor reset latches.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 1.25 V (typ), ±5% tolerance - sets precise brownout threshold via external R-divider |
| Reset Polarity | L-reset (active-low) - asserts low-level RESET signal on undervoltage condition |
| Output Type | Open-collector - requires external pull-up; supports mixed-voltage interface up to 18 V |
| Delay Time | 200 µs (typ), 80–500 µs (min–max) - ensures glitch immunity and stable processor initialization |
| Supply Range | 2 V to 17 V - enables direct use with 3.3 V, 5 V, and 12 V systems without regulation |
| Operating Temp | −30°C to +85°C - qualified for industrial-grade embedded applications |
| Input Bias Current | 100 nA (typ) - permits high-value resistor networks (e.g., 100 kΩ) with minimal error |
Pinout & Package
Package: PRSP0008DA-A (8-pin SOP, 1.27 mm pitch), not recommended for new designs per Renesas documentation. Thermal derating applies above 40°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output | Open-collector reset output - sinks current when active; requires external pull-up resistor |
| 2 | Input | Voltage sense input - connects to resistor divider node; accepts 0.8 V to 6.7 V (VCC > 7 V) |
| 3 | GND | Analog ground reference - must be connected directly to system ground plane |
| 4 | Power-supply | VCC supply input - powers internal circuitry; decoupling capacitor required |
| 5–8 | NC | No connection - left unconnected; no internal bonding or function |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable detection threshold | Settable from 2 V to 15 V using two external resistors - eliminates need for multiple fixed-threshold parts |
| Low operating supply voltage | 0.55 V (typ) minimum VCC for operation - supports deep brownout detection before system collapse |
| Fixed internal delay | 200 µs typ delay ensures sufficient hold time for CPU/MCU power stabilization and clock lock |
| Wide supply voltage range | 2 V to 17 V operation - compatible with single-cell Li-ion, 3.3 V logic, 5 V peripherals, and 12 V industrial rails |
| Low input bias current | 100 nA typ - minimizes divider network error and enables ultra-low-power battery monitoring |
Applications
| Microcontroller Power-On Reset | Battery Voltage Monitoring |
|---|---|
Use Scenario: Ensuring clean boot sequence for 8-bit/16-bit MCUs after cold start or wake-from-sleep. IC Role / Device Role / Timing Role: Generates guaranteed 200 µs minimum active-low reset pulse upon VCC crossing 1.25 V × (R1+R2)/R2 threshold. Use Value: Prevents metastability and instruction corruption by holding CPU in reset until regulated supply stabilizes and clocks settle. | Use Scenario: Detecting end-of-life voltage in backup coin cells or primary alkaline batteries. IC Role / Device Role / Timing Role: Senses declining battery voltage via resistor divider; triggers low-battery warning or graceful shutdown. Use Value: Enables accurate 2.0 V–3.0 V thresholds with <1% error using standard 1% resistors, extending usable battery life. |
| DC/DC Converter Supervision | Logic Circuit Brownout Protection |
Use Scenario: Validating output stability of isolated or non-isolated DC/DC converters before enabling downstream loads. IC Role / Device Role / Timing Role: Monitors converter output rail; asserts reset if voltage sags below programmed threshold for >200 µs. Use Value: Provides deterministic fault response independent of converter feedback loop dynamics or transient recovery time. | Use Scenario: Protecting combinational and sequential logic (e.g., FPGA configuration, CPLD state machines) from marginal supply conditions. IC Role / Device Role / Timing Role: Acts as voltage watchdog - forces synchronous reset when VCC drops below safe logic margin. Use Value: Eliminates race conditions and latch-up risk by guaranteeing all logic elements reset simultaneously under undervoltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-detecting reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EB29DBZR | Fixed 2.93 V threshold; SOT-23-3 package; 140 ms reset timeout; no external adjustment | Suitable for cost-sensitive, space-constrained designs where fixed threshold suffices | Select when board area is critical and 2.93 V matches system requirements; no resistor network needed |
| MAX809SEUR+T | Fixed 3.08 V threshold; SOT-23-3; 240 ms timeout; higher quiescent current (12 µA vs. 0.36 µA) | Preferred for legacy designs requiring pin-compatible replacement of older Maxim parts | Choose for drop-in replacement in existing MAX809 footprints; verify timing compatibility with MCU reset spec |
Compared with M51955BL#TF0J, TLV803EB29DBZR offers smaller footprint and faster qualification but lacks adjustability; MAX809SEUR+T provides industry-standard timing and footprint but consumes ~33× more supply current and fixes threshold at 3.08 V - limiting flexibility in multi-rail or battery-powered systems.
Availability
M51955BL#TF0J is available at Aetrix Electronics and suitable for industrial control panels, battery-powered instrumentation, and legacy MCU-based embedded systems requiring stable component supply and long-term lifecycle support.
Supply support for M51955BL#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 Japanese semiconductor manufacturer specializing in microcontrollers, analog and power devices, and system-on-chip solutions for automotive, industrial, and enterprise applications.
The M51955BL#TF0J belongs to Renesas' legacy Voltage Detecting, System Resetting IC Series - designed specifically for robust, low-cost power monitoring in resource-constrained embedded systems where programmable reset thresholds and predictable timing are essential.
FAQ
What is the reset logic polarity of the M51955BL#TF0J?
The M51955BL#TF0J implements an L-reset (active-low) output configuration. When the sensed input voltage falls below the programmed detection threshold, the open-collector output pulls low to assert reset. This behavior is confirmed in the Electrical Characteristics table under "L reset type M51955A, M51955B" and verified in the Operating Waveform diagram on page 3 of the datasheet. The M51955BL#TF0J maintains this polarity across its full operating temperature and supply range.
Can the M51955BL#TF0J detect voltages below 2 V?
No, the M51955BL#TF0J cannot reliably detect voltages below 2 V. Its specified supply voltage range is 2 V to 17 V, and the minimum detection voltage is constrained by the 1.25 V internal reference plus external resistor divider limitations. While the threshold operating voltage is as low as 0.55 V (typ), this refers to the minimum VCC required for internal circuit functionality - not input sensing capability. The datasheet explicitly states the detection voltage range is 2 V to 15 V when using external resistors, and the input voltage range is limited to −0.3 V to +7 V depending on VCC. The M51955BL#TF0J is not rated for sub-2 V detection.
Does the M51955BL#TF0J require an external capacitor for delay timing?
No, the M51955BL#TF0J does not require an external capacitor for its standard 200 µs delay. It integrates a monolithic delay capacitor internally, as shown in the Block Diagram on page 2 and confirmed in the Operating Waveform section. External capacitors are only required for extended delay variants (e.g., M51957/M51958), which are separate part numbers. The M51955BL#TF0J's fixed delay is inherent to its design and functions without additional components - simplifying layout and reducing BOM count.
What is the maximum sink current capability of the M51955BL#TF0J output?
The M51955BL#TF0J output is rated for a maximum sink current of 6 mA under absolute maximum conditions, with a recommended operating limit of 4 mA. At 4 mA sink current and VCC = 5 V, the output saturation voltage is 0.2 V (typ) and 0.4 V (max), ensuring reliable TTL/CMOS logic-level compatibility. Exceeding 4 mA risks exceeding thermal limits, especially in the PRSP0008DA-A package, which has reduced power dissipation (300 mW) and aggressive thermal derating above 40°C. The M51955BL#TF0J datasheet specifies these values in the Absolute Maximum Ratings and Electrical Characteristics tables.
Is the M51955BL#TF0J suitable for new designs?
No, the M51955BL#TF0J is explicitly marked "Not recommend for new design" in the official Renesas datasheet (REJ03D0777-0300 Rev.3.00). This designation applies to the entire M51955A,B/M51956A,B series due to obsolescence status and lack of long-term supply assurance. While functional and supported for legacy repair and continuity, Renesas recommends migrating to newer alternatives such as the R3112x series or ISL80112 for new projects. The M51955BL#TF0J remains available through Aetrix Electronics for existing designs requiring exact form-fit-function replacement.
M51955BL#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:
- -
M51955BL#TF0J FAQ
1.How can I place an order for M51955BL#TF0J through Aetrix?
Please submit a Request for Quotation (RFQ) for M51955BL#TF0J 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 M51955BL#TF0J reliable?
The price and inventory of M51955BL#TF0J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M51955BL#TF0J is usually 5 days.
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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 M51955BL#TF0J?
For technical support, including M51955BL#TF0J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M51955BL#TF0J requirements.
6.How does Aetrix verify that M51955BL#TF0J is sourced from the original manufacturer or authorized distributors?
All M51955BL#TF0J 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 M51955BL#TF0J meets industry standards.
7.What is the process for return or replacement of M51955BL#TF0J?
All M51955BL#TF0J units undergo pre-shipment inspection (PSI). If there is an issue with M51955BL#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 M51955BL#TF0J part is unused and in its original packaging.
Return procedure for M51955BL#TF0J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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