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Renesas M51955BFP#CF0R
- Part No.:
- M51955BFP#CF0R
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
M51955BFP#CF0R.pdf
- Description:
- POWER SUPPLY SUPPORT CIRCUIT, FI
- Quantity:
- Payment:
- Shipping:
Inventory:13,401
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Product details
Overview
M51955BFP#CF0R from Renesas Electronics is an L-type (active-low) voltage-detecting system reset IC with externally adjustable detection threshold, 200 µs typical delay, open-collector output, and operation across 2 V to 17 V supply range. It serves as a precision power-on reset supervisor for microcomputers and logic circuits in industrial control and battery-powered equipment.
For engineers reviewing the M51955BFP#CF0R datasheet, M51955BFP#CF0R pinout, M51955BFP#CF0R application, or M51955BFP#CF0R equivalent, key selection criteria include its 1.25 V internal reference, ±15 mV hysteresis, 360 µA typical circuit current at 5 V, –30°C to +85°C operating temperature, and compatibility with external resistor-based voltage setting from 2 V to 15 V.
Technical Context
The M51955BFP#CF0R implements a comparator-based detection architecture with a precision 1.25 V bandgap reference and 25 µA internal bias current. Its input stage accepts externally divided supply voltage, enabling programmable reset thresholds without trimming.
It integrates a built-in RC delay network yielding ~200 µs reset pulse width and features an open-collector output stage capable of sinking up to 4 mA while maintaining ≤0.4 V saturation voltage at 5 V supply. The device operates down to 0.55 V supply (L-type minimum operating voltage) and supports independent input voltage sourcing within defined limits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage | 1.25 V (typ), adjustable via external R1/R2 divider - enables custom reset thresholds from 2 V to 15 V |
| Hysteresis | 15 mV (typ) - prevents chatter during slow-rising or noisy supply transitions |
| Delay Time | 200 µs (typ) - ensures reliable deassertion after stable supply is reached |
| Supply Range | 2 V to 17 V - supports wide-input systems including 3.3 V, 5 V, and 12 V rails |
| Output Type | Open-collector - allows flexible pull-up to any compatible voltage rail, including higher than VCC |
| Circuit Current | 360 µA (typ) at VCC = 5 V - low quiescent consumption suitable for battery-backed applications |
| Operating Temp | –30°C to +85°C - rated for industrial ambient conditions without derating |
Pinout & Package
Package: 5-pin SIP (SIP5-P-240-2.54 / 5P5T), 11.9 mm × 2.54 mm body, plastic molded, lead material Cu alloy, Ni/Pd/Au plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output sink path |
| 2 | Input | High-impedance comparator input; accepts externally divided supply voltage for threshold setting |
| 3 | Power-supply | VCC pin; powers internal reference, comparator, and delay circuitry (2–17 V) |
| 4 | Output | Open-collector output; active-low reset signal requiring external pull-up |
| 5 | NC | No connection; internally unconnected; must be left floating or tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable detection voltage | Set via two resistors (R1/R2); formula VS ≈ 1.25 × (R1 + R2)/R2 - eliminates need for factory-trimmed variants |
| Built-in 200 µs delay | Monolithic RC timing - no external capacitor required for standard reset hold time |
| Low-threshold operation | 0.55 V minimum supply voltage (L-type) - enables reset assertion even during deep brown-out |
| Wide supply range | 2 V to 17 V - interoperable with 3.3 V, 5 V, and 12 V logic families and DC/DC outputs |
| Open-collector output | Sinks up to 4 mA at ≤0.4 V saturation - supports wired-OR reset buses and mixed-voltage systems |
Applications
| Microcomputer Power-On Reset | Battery Voltage Monitoring |
|---|---|
|
Use Scenario: Ensuring clean initialization of an 8-bit MCU upon cold start or wake-from-sleep. IC Role / Device Role / Timing Role: Active-low reset supervisor asserting /RESET until VCC exceeds 3.3 V with 200 µs hold time. Use Value: Prevents code execution before stable clock and supply; eliminates need for discrete RC network and manual calibration. |
Use Scenario: Detecting end-of-life voltage drop in a 3-cell Li-ion pack (9–12.6 V nominal). IC Role / Device Role / Timing Role: Threshold detector triggering low-battery warning when pack voltage falls below 9.0 V. Use Value: Programmable trip point via R1/R2 achieves precise 9.0 V detection with <±1% error over temperature. |
| DC/DC Converter Sequencing | Industrial Logic Circuit Reset |
|
Use Scenario: Coordinating startup sequence between primary and secondary regulated rails in a dual-output SMPS. IC Role / Device Role / Timing Role: Monitors secondary rail (5 V) and holds downstream logic in reset until it stabilizes. Use Value: Built-in 200 µs delay guarantees sufficient settling time post-regulator soft-start; open-collector output interfaces directly to FPGA reset pin. |
Use Scenario: Providing glitch-free reset to a CPLD-based I/O controller in a factory automation PLC. IC Role / Device Role / Timing Role: Supervising 5 V logic rail and asserting active-low reset during brown-out events below 4.65 V. Use Value: 15 mV hysteresis prevents oscillation on noisy industrial power lines; –30°C to +85°C rating ensures reliability in uncontrolled enclosures. |
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 delay; 0.9 µA quiescent current | Not adjustable; unsuitable where custom threshold or sub-ms delay required | Select when fixed threshold and ultra-low IQ outweigh programmability needs |
| MAX809SEUR+T | Fixed 3.08 V threshold; SOT-23-3; 240 ms delay; 12 µA IQ; push-pull output | Lacks external adjustability and open-collector flexibility; higher IQ than M51955BFP#CF0R | Choose only if board space is constrained and 3.08 V matches system requirement exactly |
Compared with TLV803EB29DBZR and MAX809SEUR+T, the M51955BFP#CF0R offers unique value in systems requiring field-configurable reset thresholds, sub-millisecond delays, and open-collector interfacing - all in a through-hole SIP package suited for prototyping and industrial assembly.
Availability
M51955BFP#CF0R is available at Aetrix Electronics and suitable for industrial control panels, battery management subsystems, and legacy microcomputer reset circuits requiring stable component supply and long-term obsolescence support.
Supply support for M51955BFP#CF0R 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 M51955BFP#CF0R belongs to Renesas' legacy Voltage Detecting, System Resetting IC Series designed specifically for cost-sensitive, high-reliability reset supervision in industrial and consumer electronics where programmable thresholds and robust noise immunity are essential.
FAQ
What is the detection voltage accuracy of the M51955BFP#CF0R?
The M51955BFP#CF0R has a detection voltage of 1.25 V (typ) with ±0.05 V tolerance (1.20 V to 1.30 V) at 25°C. Its hysteresis is 15 mV (typ), and temperature coefficient is 0.01 %/°C - meaning total drift remains under ±15 mV across –30°C to +85°C. This ensures repeatable reset behavior in varying thermal environments without calibration.
Can the M51955BFP#CF0R be used with a 3.3 V supply rail?
Yes, the M51955BFP#CF0R operates reliably from 2 V to 17 V, making it fully compatible with 3.3 V systems. At VCC = 3.3 V, its circuit current is ~300 µA (typ), and the open-collector output can sink ≥4 mA while maintaining ≤0.4 V saturation - allowing direct interface to 3.3 V logic inputs with appropriate pull-up.
How do I calculate the external resistor values for a 4.5 V reset threshold using the M51955BFP#CF0R?
Use the formula VS ≈ 1.25 × (R1 + R2)/R2. For VS = 4.5 V, solve for R1/R2 = (4.5 / 1.25) – 1 = 2.6. Select R2 = 10 kΩ → R1 = 26 kΩ (standard E24 value: 27 kΩ yields 4.55 V). Confirm with input current error margin: at 100 nA, 27 kΩ adds only 2.7 mV - well within tolerance.
Is the M51955BFP#CF0R pin-compatible with other members of the M51955/M51956 family?
The M51955BFP#CF0R shares identical 5-pin SIP pinout with M51955AFP and M51955AL variants. However, M51956-series (H-reset type) and SOP-packaged versions (e.g., BFP vs. AL) differ in pin count and arrangement - only M51955x SIP variants are mechanically and electrically interchangeable in footprint and function.
Does the M51955BFP#CF0R require an external capacitor for delay functionality?
No. The M51955BFP#CF0R integrates a monolithic delay capacitor, providing a typical 200 µs reset pulse width without any external components. This distinguishes it from longer-delay variants like M51957/M51958, which require external Cd for configurable timing - simplifying BOM and layout for standard reset hold requirements.
M51955BFP#CF0R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Voltage Detector
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.25V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 80µs Minimum
- Operating Temperature:
- -30°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
M51955BFP#CF0R FAQ
1.How can I place an order for M51955BFP#CF0R through Aetrix?
Please submit a Request for Quotation (RFQ) for M51955BFP#CF0R 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 M51955BFP#CF0R reliable?
The price and inventory of M51955BFP#CF0R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M51955BFP#CF0R is usually 5 days.
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5.How can I obtain technical support or documentation for M51955BFP#CF0R?
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6.How does Aetrix verify that M51955BFP#CF0R is sourced from the original manufacturer or authorized distributors?
All M51955BFP#CF0R 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 M51955BFP#CF0R meets industry standards.
7.What is the process for return or replacement of M51955BFP#CF0R?
All M51955BFP#CF0R units undergo pre-shipment inspection (PSI). If there is an issue with M51955BFP#CF0R, 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 M51955BFP#CF0R part is unused and in its original packaging.
Return procedure for M51955BFP#CF0R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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