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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Supervisors

Renesas RNA51958BFP#H0

Name: RNA51958BFP#H0
Brand: Renesas
SKU: RNA51958BFP#H0
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: RNA51958BFP#H0

Manufacturer:: Renesas

Category:: Supervisors

Package:: 8-SOIC (0.173", 4.40mm Width)

Datasheet:: RNA51958BFP#H0.pdf

Description:: IC SUPERVISOR 1 CHANNEL 8SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

RNA51958BFP#H0 from Renesas Electronics is a voltage-detecting system reset IC with adjustable detection threshold (1.25 V typical), open-collector output, and external capacitor-controlled delay (e.g., ~100 ms at 0.33 µF). It operates across 2–17 V supply range and serves as a precision reset supervisor for microcontrollers and logic circuits in battery-powered and industrial systems.

For engineers reviewing the RNA51958BFP#H0 datasheet, RNA51958BFP#H0 pinout, RNA51958BFP#H0 application, or RNA51958BFP#H0 equivalent, key selection criteria include its externally programmable detection voltage via resistor divider, temperature-stable 15 mV hysteresis, −40°C to +85°C operating range, and SOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

The RNA51958BFP#H0 implements a precision bandgap-based voltage comparator with 1.25 V reference and 15 mV hysteresis to prevent chatter during threshold crossing. Its open-collector output supports flexible pull-up configurations up to 17 V, enabling direct interfacing with diverse logic families.

A dedicated delay capacitor terminal (pin 3) connects to an internal constant-current sink (−5 µA typ), generating a predictable delay time governed by t_pd ≈ 0.34 × C_d(pF) µs - allowing accurate reset assertion timing without internal RC components.

Key Specifications

Parameter	Value and Actual Design Meaning
Detection Voltage	1.25 V (typ), adjustable via external resistor divider - enables custom reset thresholds from 2 V to 15 V
Hysteresis	15 mV (typ) - ensures noise immunity and stable reset release without oscillation
Supply Range	2 V to 17 V - supports wide-input systems including 3.3 V, 5 V, 12 V, and battery-backed rails
Delay Time	1.6–7.0 ms (at 0.01 µF); scalable to ~100 ms (at 0.33 µF) - provides configurable reset hold duration
Output Type	Open-collector - allows level-shifting, wired-OR, and high-voltage pull-up (up to 17 V)
Operating Temp	−40°C to +85°C - qualified for industrial and automotive-adjacent environments
Input Current	100 nA (typ) - minimizes resistor-divider loading error for precise threshold setting

Pinout & Package

SOP-8 package (PRSP0008DE-C), 4.4 mm × 4.85 mm body, 1.27 mm pitch, Ni/Pd/Au plating, tape-and-reel (2,500 pcs/reel).

Pin/Terminal	Circuit Role	Design Meaning
1	No Connection	Internally unconnected; must be left floating or tied to GND per layout best practice
2	Input	Voltage sense node - accepts divided supply or external signal; input range: −0.3 V to 7.0 V (V_CC > 7 V)
3	Delay Capacitor	Connects to internal −5 µA current sink - sets reset delay time via external capacitor value
4	Power-supply	V_CC input - supplies internal circuitry; valid range: 2 V to 17 V
5	No Connection	Internally unconnected; must be left floating or tied to GND
6	GND	Ground reference for all internal blocks and output stage
7	No Connection	Internally unconnected; must be left floating or tied to GND
8	Output	Open-collector output - sinks current when asserted; requires external pull-up to logic rail

Key Features

Feature	Design Value
Externally adjustable detection voltage	Set via two-resistor divider - eliminates need for multiple fixed-threshold variants
Predictable capacitor-based delay	t_pd ≈ 0.34 × C_d(pF) µs - enables accurate, low-component-count timing without trimming
Low input bias current	100 nA typ - preserves accuracy of high-impedance resistor dividers
Wide supply voltage operation	2–17 V - supports single-supply designs across 3.3 V, 5 V, and 12 V domains
Industrial temperature range	−40°C to +85°C - ensures reliability in embedded control and instrumentation applications

Applications

Battery-Powered Microcontroller Reset	DC/DC Converter Supervision
Use Scenario: Monitoring Li-ion battery voltage during deep discharge to assert MCU reset before brownout. IC Role / Device Role / Timing Role: Voltage-detecting reset supervisor with user-defined threshold (e.g., 2.8 V) and 50 ms delay to ensure clean power-down sequence. Use Value: Prevents MCU corruption by guaranteeing reset assertion prior to supply collapse, using only two resistors and one capacitor.	Use Scenario: Validating stable output from isolated DC/DC converter before enabling downstream logic. IC Role / Device Role / Timing Role: Output voltage monitor with open-collector output pulled to 3.3 V rail - asserts reset until regulated 5 V reaches 4.75 V. Use Value: Eliminates need for dedicated voltage supervisor IC; leverages existing converter feedback network for detection.
Logic-Level Waveform Shaping	Backup Power Switchover Control
Use Scenario: Converting noisy power-on pulse into clean, debounced enable signal for FPGA configuration. IC Role / Device Role / Timing Role: Input-triggered delay generator - pin 2 driven by raw POR signal; pin 3 capacitor sets 10 ms hold time. Use Value: Replaces RC+Schmitt circuit with temperature-stable, repeatable delay and no component drift over life.	Use Scenario: Managing switchover from main to backup battery in medical data logger during AC failure. IC Role / Device Role / Timing Role: Dual-rail monitor - detects main supply drop, delays switchover via Cd, then asserts reset to synchronize state save. Use Value: Ensures deterministic 100 ms window for nonvolatile memory write completion before backup activation.

Battery-Powered Microcontroller Reset

DC/DC Converter Supervision

Use Scenario: Monitoring Li-ion battery voltage during deep discharge to assert MCU reset before brownout.

IC Role / Device Role / Timing Role: Voltage-detecting reset supervisor with user-defined threshold (e.g., 2.8 V) and 50 ms delay to ensure clean power-down sequence.

Use Value: Prevents MCU corruption by guaranteeing reset assertion prior to supply collapse, using only two resistors and one capacitor.

Use Scenario: Validating stable output from isolated DC/DC converter before enabling downstream logic.

IC Role / Device Role / Timing Role: Output voltage monitor with open-collector output pulled to 3.3 V rail - asserts reset until regulated 5 V reaches 4.75 V.

Use Value: Eliminates need for dedicated voltage supervisor IC; leverages existing converter feedback network for detection.

Logic-Level Waveform Shaping

Backup Power Switchover Control

Use Scenario: Converting noisy power-on pulse into clean, debounced enable signal for FPGA configuration.

IC Role / Device Role / Timing Role: Input-triggered delay generator - pin 2 driven by raw POR signal; pin 3 capacitor sets 10 ms hold time.

Use Value: Replaces RC+Schmitt circuit with temperature-stable, repeatable delay and no component drift over life.

Use Scenario: Managing switchover from main to backup battery in medical data logger during AC failure.

IC Role / Device Role / Timing Role: Dual-rail monitor - detects main supply drop, delays switchover via Cd, then asserts reset to synchronize state save.

Use Value: Ensures deterministic 100 ms window for nonvolatile memory write completion before backup activation.

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; no external delay capacitor support; push-pull output	Requires no resistor divider but lacks timing flexibility; unsuitable for adjustable-delay use cases	Select when fixed threshold and minimal BOM count outweigh need for delay tuning
MAX809SEUR+T	Fixed 2.93 V threshold; 140 ms factory-fixed delay; open-collector output	Provides guaranteed delay but no user adjustment; limited to single voltage point	Choose for cost-sensitive, high-volume applications where 2.93 V reset is sufficient and delay is invariant

Compared with TLV803EB29DBZR and MAX809SEUR+T, RNA51958BFP#H0 uniquely supports both user-defined detection voltage (via resistor divider) and externally programmable delay (via capacitor), making it suitable for multi-rail systems and designs requiring precise timing control - whereas alternatives offer fixed parameters at lower component count.

Availability

RNA51958BFP#H0 is available at Aetrix Electronics and suitable for battery monitoring, DC/DC supervision, logic reset sequencing, and waveform shaping applications requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for RNA51958BFP#H0 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 is a global semiconductor manufacturer specializing in microcontrollers, analog, and power management solutions for industrial, automotive, and infrastructure markets.

The RNA51958 series belongs to Renesas' voltage supervisor product line, designed specifically for flexible, low-component-count reset generation in resource-constrained embedded systems where programmability and temperature stability are critical.

FAQ

What is the detection voltage accuracy and temperature coefficient of RNA51958BFP#H0?

The RNA51958BFP#H0 has a typical detection voltage of 1.25 V with ±50 mV total tolerance (1.20–1.30 V) and a temperature coefficient of 0.01 %/°C. This ensures stable reset thresholds across −40°C to +85°C ambient conditions without calibration, directly supporting reliable operation in industrial environments where thermal drift must be minimized.

How does the delay capacitor connection work on RNA51958BFP#H0?

The RNA51958BFP#H0 uses pin 3 (Delay Capacitor) connected to an internal constant-current sink of −5 µA (typ). Delay time follows t_pd ≈ 0.34 × C_d(pF) µs - for example, a 0.33 µF capacitor yields ~100 ms delay. Capacitors must be within 4700 pF to 10 µF; values beyond this degrade timing accuracy and response to transient dips.

Can RNA51958BFP#H0 monitor voltages above its own supply rail?

No - RNA51958BFP#H0 input (pin 2) must remain within −0.3 V to 7.0 V when V_CC > 7 V, or −0.3 V to V_CC − 0.3 V when V_CC ≤ 7 V. It cannot directly monitor higher voltages; a resistor divider is required to scale down inputs such as 12 V or 24 V rails to stay within absolute maximum ratings.

What is the maximum allowable output sink current for RNA51958BFP#H0?

The RNA51958BFP#H0 open-collector output supports up to 4 mA continuous sink current (6 mA absolute maximum). To comply, the external pull-up resistor R_L must satisfy R_L ≥ (V_PULLUP − 0.4 V)/4 mA - e.g., for a 5 V pull-up, R_L ≥ 1.15 kΩ. Exceeding this risks output saturation voltage rise and potential latch-up.

Is RNA51958BFP#H0 pin-compatible with RNA51958AFPH0?

Yes - RNA51958BFP#H0 and RNA51958AFPH0 share identical SOP-8 (PRSP0008DE-C) packaging, pinout, and footprint. The functional difference lies solely in output architecture: RNA51958BFP#H0 uses open-collector output (requires external pull-up), while RNA51958AFPH0 integrates a built-in load (push-pull compatible). No PCB changes are needed for substitution, but circuit-level pull-up configuration must be verified.

RNA51958BFP#H0 Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 8-SOIC (0.173", 4.40mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Programmable:: Not Verified

Type:: Simple Reset/Power-On Reset

Number of Voltages Monitored:: 1

Voltage - Threshold:: 1.25V

Output:: Open Drain or Open Collector

Reset:: Active High

Reset Timeout:: Adjustable/Selectable

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

RNA51958BFP#H0 FAQ

1.How can I place an order for RNA51958BFP#H0 through Aetrix?

Please submit a Request for Quotation (RFQ) for RNA51958BFP#H0 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 RNA51958BFP#H0 reliable?

The price and inventory of RNA51958BFP#H0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for RNA51958BFP#H0 is usually 5 days.

3.What payment methods are accepted for RNA51958BFP#H0?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for RNA51958BFP#H0 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for RNA51958BFP#H0?

RNA51958BFP#H0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your RNA51958BFP#H0 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 RNA51958BFP#H0?

For technical support, including RNA51958BFP#H0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your RNA51958BFP#H0 requirements.

6.How does Aetrix verify that RNA51958BFP#H0 is sourced from the original manufacturer or authorized distributors?

All RNA51958BFP#H0 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 RNA51958BFP#H0 meets industry standards.

7.What is the process for return or replacement of RNA51958BFP#H0?

All RNA51958BFP#H0 units undergo pre-shipment inspection (PSI). If there is an issue with RNA51958BFP#H0, 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 RNA51958BFP#H0 part is unused and in its original packaging.

Return procedure for RNA51958BFP#H0:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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