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Renesas M51945BJFP#CD0J
- Part No.:
- M51945BJFP#CD0J
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
M51945BJFP#CD0J.pdf
- Description:
- IC SUPERVISOR VOLT DET SYS RESET
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
M51945BJFP#CD0J from Renesas Electronics is a low-power, adjustable-voltage system reset IC with open-collector output and L-reset (active-low) logic polarity. It features 1.25 V internal reference, 15 mV typical hysteresis, 2–17 V supply range, and operates down to 0.55 V supply for functional reset assertion. It is used in microcomputer power-on reset circuits where external resistor programming sets detection threshold.
For engineers reviewing the M51945BJFP#CD0J datasheet, M51945BJFP#CD0J pinout, M51945BJFP#CD0J application, or M51945BJFP#CD0J equivalent, this page delivers verified electrical parameters, package mapping to 5-pin SIP (5P5T), confirmed open-collector output behavior, thermal derating curve data, and real-world reset timing constraints - all directly traceable to Renesas REJ03D0774-0300 Rev.3.00.
Technical Context
The M51945BJFP#CD0J implements a precision comparator architecture with a 1.25 V bandgap reference and 25 µA internal bias current. Its input stage accepts externally divided supply voltage, enabling programmable reset thresholds between 2 V and 15 V via R1/R2 network. The comparator drives an open-collector NPN output stage, requiring external pull-up for high-level assertion.
This device belongs to the "B" variant of the M51945 series, confirming open-collector output (not built-in load), L-reset logic (output goes low on undervoltage), and operation across –30°C to +85°C ambient. It does not include internal delay circuitry or watchdog functionality - reset response is purely voltage-triggered with 2–4 µs propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detecting voltage | 1.25 V (typical); sets precise undervoltage trip point using 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-backed systems |
| Circuit current | 280 µA (typical at VCC = 5 V); enables ultra-low-quiescent-power reset supervision |
| Output type | Open collector (B variant); requires external pull-up; sinks up to 4 mA at Vsat ≤ 0.4 V |
| Threshold operating voltage | 0.55 V (typical); guarantees internal circuit operation even during deep brownout |
| Propagation delay | tPLH = 2 µs, tPHL = 4 µs; defines minimum reset pulse width under fast supply transients |
Pinout & Package
Package: 5-pin SIP (Single In-line Package), Renesas code 5P5T, JEDEC standard SIP5-P-240-2.54, body size 11.9 × 2.54 mm, lead pitch 2.54 mm, Cu alloy leads with Ni/Pd/Au plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal comparator and output transistor emitter |
| 2 | Input | High-impedance comparator input (100 nA typ); connects to resistor-divider midpoint |
| 3 | Power-supply | VCC pin; powers internal reference and comparator; must be applied before Input |
| 4 | Output | Open-collector NPN collector; sinks current when reset active (low); requires external pull-up |
| 5 | NC | No connection; internally unconnected; must remain floating or grounded per layout guidelines |
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 ICs |
| Ultra-low operating supply | Functional down to 0.55 V supply; ensures valid reset assertion during severe brownout conditions |
| Low input bias current | 100 nA typical; minimizes resistor-divider error and enables high-value R1/R2 for low power |
| Wide temperature stability | 0.01 %/°C detecting voltage drift; maintains accuracy across –30°C to +85°C industrial range |
| Fast reset response | 2 µs rise / 4 µs fall propagation delay; meets timing requirements for modern microcontrollers |
Applications
| Microcontroller Power-On Reset | Battery Voltage Monitor |
|---|---|
Use Scenario: Ensuring reliable CPU initialization after cold start or wake-from-sleep in embedded controllers. IC Role / Device Role / Timing Role: L-reset supervisor asserting active-low RESET signal until VCC exceeds programmed threshold. Use Value: Prevents code execution at insufficient voltage; eliminates need for discrete RC+Schmitt trigger networks. |
Use Scenario: Monitoring Li-ion or alkaline battery pack voltage to trigger low-battery warning or shutdown. IC Role / Device Role / Timing Role: Threshold detector comparing scaled battery voltage against 1.25 V reference. Use Value: Enables accurate, temperature-stable battery end-of-life detection with <±2% total error over full range. |
| DC/DC Converter UVLO Feedback | Logic-Level Signal Conditioning |
Use Scenario: Providing undervoltage lockout (UVLO) enable signal to switching regulator control ICs. IC Role / Device Role / Timing Role: Reset generator interfacing with enable pin of DC/DC controller via open-collector pull-down. Use Value: Guarantees regulator remains disabled below safe input voltage; avoids unstable startup or shoot-through. |
Use Scenario: Converting noisy or slow-rising analog supply rails into clean digital reset or flag signals. IC Role / Device Role / Timing Role: Precision comparator with hysteresis shaping input waveform into glitch-free logic edge. Use Value: Replaces discrete op-amp comparators; reduces BOM count while improving noise immunity and consistency. |
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 |
|---|---|---|---|
| TLV803EB29DBZR | Fixed 2.93 V threshold; SOT-23-3 package; 1.8–6 V supply; no external resistor adjustment | Suitable only for fixed-threshold designs; lacks programmability and wide-VCC support of M51945BJFP#CD0J | Select when board space is critical and detection voltage is stable at 2.93 V; not interchangeable without schematic change. |
| MAX809SEUR+T | Fixed 3.08 V threshold; SOT-23-3; 1.0–6.0 V supply; built-in 140 ms reset timeout; push-pull output | Includes fixed delay and higher drive strength; incompatible pinout and no external threshold tuning | Choose for simplified drop-in replacement where 3.08 V reset and guaranteed minimum pulse width are required. |
Compared with TLV803EB29DBZR and MAX809SEUR+T, the M51945BJFP#CD0J uniquely supports user-defined reset thresholds from 2 V to 15 V, operates across 2–17 V supply, and retains function down to 0.55 V - making it suitable for legacy industrial systems where flexibility and brownout robustness outweigh compact packaging needs.
Availability
M51945BJFP#CD0J is available at Aetrix Electronics and suitable for industrial control panels, legacy automotive ECUs, and battery-powered instrumentation requiring stable component supply and long-term obsolescence management.
Supply support for M51945BJFP#CD0J 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 formed in 2010 through merger of NEC Electronics and Renesas Technology, specializing in microcontrollers, analog, and power management ICs for industrial and automotive markets.
The M51945BJFP#CD0J belongs to Renesas' legacy Voltage Detecting, System Resetting IC Series - designed specifically for cost-sensitive, high-reliability reset supervision in resource-constrained embedded systems where programmable threshold and wide supply tolerance are essential.
FAQ
What is the output configuration of the M51945BJFP#CD0J?
The M51945BJFP#CD0J features an open-collector NPN output (confirmed "B" variant), requiring an external pull-up resistor to generate a high-level signal. When reset is asserted, the output sinks current to GND (low state); it floats high otherwise. This configuration allows wired-OR connectivity and voltage-level translation across different logic families. The M51945BJFP#CD0J datasheet specifies 4 mA maximum sink current at Vsat ≤ 0.4 V.
Can the M51945BJFP#CD0J detect voltages below 2 V?
No - the M51945BJFP#CD0J is specified for detection thresholds between 2 V and 15 V, derived from its 1.25 V internal reference and external resistor divider. While the IC itself can operate down to 0.55 V supply (VOPL), the input voltage at Pin 2 must remain within –0.3 V to VCC–0.3 V (for VCC ≤ 7 V) or –0.3 V to +7 V (for VCC > 7 V). Sub-2 V detection violates both functional design intent and absolute maximum ratings.
Is the M51945BJFP#CD0J pin-compatible with other members of the M51945 series?
No - the M51945BJFP#CD0J uses a 5-pin SIP package (5P5T), whereas M51945AL/BL variants use 8-pin SOP packages (PRSP0008DE-C or PRSP0008DA-A). Pin count, pinout, and physical footprint differ fundamentally. The "JFP" suffix explicitly denotes the 5-pin SIP variant; substitution with 8-pin versions requires PCB redesign and is not recommended for new designs per Renesas documentation.
What is the hysteresis behavior of the M51945BJFP#CD0J?
The M51945BJFP#CD0J provides 15 mV typical hysteresis (ΔVS) between rising and falling input thresholds, preventing oscillation during slow or noisy supply transitions. For example, with a nominal 5 V detection setpoint, the device releases reset at ~5.015 V and reasserts at ~4.985 V. This hysteresis is internal and fixed - not adjustable - and is fully characterized from –30°C to +85°C per the REJ03D0774-0300 datasheet.
Does the M51945BJFP#CD0J support high-temperature operation beyond +85°C?
No - the M51945BJFP#CD0J is rated for industrial-grade operation from –30°C to +85°C ambient (Topr). Its thermal derating curve shows power dissipation reduced by 3 mW/°C above +85°C, and absolute maximum junction temperature is not specified beyond this range. Renesas explicitly classifies this part as "Standard" quality grade, intended for computers, office equipment, and industrial robots - not extended-temperature or automotive applications.
M51945BJFP#CD0J 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:
- -
M51945BJFP#CD0J FAQ
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6.How does Aetrix verify that M51945BJFP#CD0J is sourced from the original manufacturer or authorized distributors?
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7.What is the process for return or replacement of M51945BJFP#CD0J?
All M51945BJFP#CD0J units undergo pre-shipment inspection (PSI). If there is an issue with M51945BJFP#CD0J, 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 M51945BJFP#CD0J part is unused and in its original packaging.
Return procedure for M51945BJFP#CD0J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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