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Renesas M51946BFP#600C
- Part No.:
- M51946BFP#600C
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
M51946BFP#600C.pdf
- Description:
- IC SUPERVISOR VOLT DET SYS RESET
- Quantity:
- Payment:
- Shipping:
Inventory:8,754
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Product details
Overview
M51946BFP#600C from Renesas Electronics is an H-type (active-high) system reset IC with open-collector output, designed for voltage monitoring and power-on reset generation in microcontroller and logic circuits. It features a 1.25 V internal reference, 15 mV typical hysteresis, 2–17 V supply range, and operates down to 0.55 V supply voltage. It is used in battery-backed systems and DC/DC converter supervision where precise, externally adjustable threshold detection is required.
For engineers reviewing the M51946BFP#600C datasheet, M51946BFP#600C pinout, M51946BFP#600C application, or M51946BFP#600C equivalent, this page delivers verified electrical parameters, package mapping to 5-pin SIP (5P5T), confirmed open-collector output behavior, thermal derating data, and real-world reset timing characteristics - all validated against Renesas REJ03D0774-0300 Rev.3.00.
Technical Context
The M51946BFP#600C implements a precision comparator architecture with a stable 1.25 V bandgap reference and 25 µA internal bias current. Its input stage monitors external voltage via resistor divider, enabling programmable detection thresholds from 2 V to 15 V using R1/R2 configuration.
As an "H" reset type device, it asserts a high-level reset signal when input voltage exceeds the threshold, with propagation delays of 2 µs (L→H) and 4 µs (H→L). The open-collector output requires an external pull-up resistor and supports sink currents up to 4 mA while maintaining ≤0.4 V saturation voltage at 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detecting voltage | 1.25 V (typical); sets precise reset threshold via external resistor divider |
| Hysteresis voltage | 15 mV (typical); prevents chatter during slow-rising/falling supply transitions |
| Supply voltage range | 2 V to 17 V; supports wide-input industrial and battery-powered systems |
| Output type | Open collector; enables flexible level translation and wired-OR reset bus implementation |
| Circuit current | 280 µA (typical at 5 V); ultra-low quiescent consumption for always-on monitoring |
| Threshold operating voltage | 0.55 V (typical); ensures functional operation even during deep brown-out conditions |
| Propagation delay | 2 µs (L→H), 4 µs (H→L); enables fast, deterministic reset assertion/deassertion |
Pinout & Package
Package: 5-pin SIP (5P5T), plastic single-in-line package, 2.54 mm pitch, JEDEC-compliant, 11.9 × 4.0 × 3.0 mm body size.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output sink path |
| 2 | Input | High-impedance voltage sense node; accepts divided supply for threshold setting |
| 3 | Power-supply | VCC input; powers internal comparator and bias circuitry (2–17 V) |
| 4 | Output | Open-collector NPN output; sinks current when reset active (low state) |
| 5 | NC | No connection; internally unconnected; must be left floating or grounded |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable detection voltage | Settable from 2 V to 15 V using two external resistors; eliminates need for multiple fixed-threshold parts |
| Low threshold operating voltage | 0.55 V typical minimum VCC for operation; maintains reset integrity during severe undervoltage events |
| Wide supply voltage range | 2–17 V operation; compatible with 3.3 V, 5 V, 12 V, and multi-rail industrial systems |
| Open-collector output | Supports pull-up to any logic rail ≤18 V; enables shared reset buses and mixed-voltage system interfacing |
| Low input current | 100 nA typical; minimizes loading error on resistor-divider networks and preserves accuracy |
Applications
| Microcontroller Power-On Reset | Battery Voltage Monitoring |
|---|---|
Use Scenario: Ensuring reliable initialization of an embedded MCU after cold start or brown-out recovery. IC Role / Device Role / Timing Role: Active-high reset generator triggered when VCC rises above programmed threshold (e.g., 3.0 V). Use Value: Prevents code execution before stable supply is achieved; eliminates need for discrete RC reset networks with poor temperature stability. |
Use Scenario: Supervising lithium-ion or alkaline battery pack voltage to trigger low-battery warning or shutdown. IC Role / Device Role / Timing Role: Threshold detector comparing battery voltage (via divider) against 1.25 V reference. Use Value: Enables accurate, hysteresis-stabilized battery check without microcontroller ADC overhead or software polling. |
| DC/DC Converter Output Supervision | Logic Circuit Reset Coordination |
Use Scenario: Validating regulated output of a buck converter before enabling downstream loads. IC Role / Device Role / Timing Role: Monitors converter output rail; asserts reset until voltage stabilizes within tolerance. Use Value: Guarantees clean power sequencing; avoids partial initialization of FPGAs or ASICs due to premature enable. |
Use Scenario: Synchronizing reset across multiple CMOS logic families (e.g., Pch/Nch, TTL, and CMOS ICs) sharing one supply. IC Role / Device Role / Timing Role: Single-point reset source with open-collector output driving wired-OR reset bus. Use Value: Eliminates timing skew between disparate logic families; simplifies PCB routing versus individual RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-detection and system-reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV803EBPDBVR | Fixed 3.08 V threshold; SOT-23-5 package; 1.8–6 V supply; push-pull output | Lacks external threshold adjustability; unsuitable for custom voltage detection below 2 V or above 5 V | Choose when fixed threshold and space-constrained layout outweigh programmability needs |
| MAX809SEUR+T | Fixed 3.08 V threshold; SOT-23-3 package; 1–6 V supply; open-collector output | No input pin; monitors VCC directly; no external resistor network support | Select only for simple VCC-monitored reset where threshold adjustment is unnecessary |
Compared with M51946BFP#600C, TLV803EBPDBVR offers smaller footprint but forfeits programmable detection and wide supply range; MAX809SEUR+T provides minimal pin count but cannot monitor external voltages or operate above 6 V - making M51946BFP#600C uniquely suited for adjustable, high-voltage, multi-rail reset coordination.
Availability
M51946BFP#600C is available at Aetrix Electronics and suitable for industrial control panels, battery-powered instrumentation, and DC/DC converter modules requiring stable component supply with long-term lifecycle visibility.
Supply support for M51946BFP#600C 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 management ICs for industrial, automotive, and infrastructure applications.
The M51946BFP#600C belongs to Renesas' legacy Voltage Detecting, System Resetting IC Series, designed specifically for robust, low-power reset generation in cost-sensitive and thermally demanding embedded systems.
FAQ
What is the reset logic polarity of M51946BFP#600C?
M51946BFP#600C is an "H" reset type IC: its output goes high (active) when the monitored input voltage exceeds the detection threshold. This active-high behavior is confirmed in the block diagram and operating waveform section of Renesas REJ03D0774-0300 Rev.3.00, distinguishing it from the complementary "L" type M51945BFP#600C.
Can M51946BFP#600C monitor voltages higher than its supply voltage?
No. Per the Absolute Maximum Ratings and Input Voltage Range specifications in the datasheet, M51946BFP#600C's input voltage must stay within –0.3 V to VCC–0.3 V (for VCC ≤ 7 V) or –0.3 V to +7 V (for VCC > 7 V). Direct monitoring of voltages exceeding VCC requires external scaling via resistor divider - which is the intended use case for this device.
What is the recommended pull-up resistor value for the open-collector output of M51946BFP#600C?
Renesas specifies that the output sink current must remain ≤4 mA under normal operation. For a 5 V pull-up, RL ≥ 1.25 kΩ satisfies this (5 V ÷ 4 mA = 1.25 kΩ); typical designs use 4.7 kΩ to 10 kΩ to reduce power and ensure compatibility with high-impedance logic inputs. RL selection also affects rise time and noise immunity.
Is M51946BFP#600C suitable for automotive applications?
No. M51946BFP#600C is rated for Standard quality grade per Renesas documentation, targeting office equipment, industrial robots, and consumer electronics. It is not qualified for automotive (AEC-Q100) or safety-critical applications such as transportation or medical life-support systems.
Does M51946BFP#600C require external capacitors for stable operation?
Yes. Renesas recommends installing both low-frequency (C1) and high-frequency (C2) bypass capacitors between VCC and GND, as shown in Figure 2 of REJ03D0774-0300. This mitigates ripple and noise on the supply line that could cause false resets - a requirement explicitly stated in the "Notice for use" section.
M51946BFP#600C 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:
- -
M51946BFP#600C FAQ
1.How can I place an order for M51946BFP#600C through Aetrix?
Please submit a Request for Quotation (RFQ) for M51946BFP#600C 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 M51946BFP#600C reliable?
The price and inventory of M51946BFP#600C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M51946BFP#600C is usually 5 days.
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Once your M51946BFP#600C 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 M51946BFP#600C?
For technical support, including M51946BFP#600C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M51946BFP#600C requirements.
6.How does Aetrix verify that M51946BFP#600C is sourced from the original manufacturer or authorized distributors?
All M51946BFP#600C 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 M51946BFP#600C meets industry standards.
7.What is the process for return or replacement of M51946BFP#600C?
All M51946BFP#600C units undergo pre-shipment inspection (PSI). If there is an issue with M51946BFP#600C, 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 M51946BFP#600C part is unused and in its original packaging.
Return procedure for M51946BFP#600C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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