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Renesas REAR56957BGSM#HC0
- Part No.:
- REAR56957BGSM#HC0
- Manufacturer:
- Renesas
- Category:
- Supervisors
- Package:
- 8-SOIC (0.173", 4.40mm Width)
- Datasheet:
-
REAR56957BGSM#HC0.pdf
- Description:
- LINEAR IC SOP(225)
- Quantity:
- Payment:
- Shipping:
Inventory:9,218
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Product details
Overview
REAR56957BGSM#HC0 from Renesas Electronics is a voltage-detecting system reset IC with open-collector output (Type B), 1.25 V typical detection threshold, ±4% detection accuracy, 2–17 V supply range, and externally adjustable delay via capacitor (0.0047–10 µF). It serves as a precision reset supervisor in 3V microcontroller systems.
For engineers reviewing the REAR56957BGSM#HC0 datasheet, REAR56957BGSM#HC0 pinout, REAR56957BGSM#HC0 application, or REAR56957BGSM#HC0 equivalent, key selection criteria include its L-reset behavior, low-threshold operating voltage (0.67 V min at RL = 2.2 kΩ), open-collector output compatibility with external pull-up, and temperature-stable detection voltage (±0.01%/°C TC).
Technical Context
The REAR56957BGSM#HC0 implements an internal bandgap reference (1.25 V) feeding a comparator with 15 mV typical hysteresis to prevent chatter during voltage transitions. Its delay timing is generated by charging an external capacitor (Cd) through a constant current source (−5 µA typ), yielding tpd ≈ 0.34 × Cd(pF) µs.
As a Type B variant, it features an open-collector output requiring an external pull-up resistor (RL), enabling flexible logic-level interfacing across 2–17 V domains. Input voltage is derived from a resistor divider on the monitored supply, with input current limited to 500 nA max to minimize divider error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Detection Voltage (VS) | 1.25 V (typ), 1.20–1.30 V (min–max); sets precise reset threshold for supply monitoring |
| Hysteresis Voltage (ΔVS) | 15 mV (typ), 9–23 mV; prevents oscillation during slow-rising/falling supply edges |
| Supply Voltage Range | 2 V to 17 V; supports wide-range industrial and embedded power rails |
| Output Type | Open-collector (Type B); requires external pull-up for logic-level compatibility with MCU reset inputs |
| Delay Time Range | 1.6–7.0 ms (with Cd = 0.01 µF); scalable to seconds using Cd up to 10 µF |
| Threshold Operating Voltage | 0.67 V (min, RL = 2.2 kΩ); ensures reliable reset assertion even during deep brown-out |
| Input Current (IIN) | 500 nA (max at VIN = 1.25 V); enables high-impedance resistor dividers without significant error |
Pinout & Package
REAR56957BGSM#HC0 is housed in an 8-pin plastic SOP package (JEITA code P-LSOP8-4.4×5.2-1.27, Renesas code PLSP0008DE-A, mass 0.09 g), with 1.27 mm pitch and 5.72 mm body width.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and output sink path |
| 2 | Input | High-impedance comparator input; accepts divided supply voltage for detection |
| 3 | NC | No internal connection; must be left unconnected or tied to GND |
| 4 | Power-supply (VCC) | IC supply rail; powers internal reference, comparator, and delay circuit |
| 5 | NC | No internal connection; must be left unconnected or tied to GND |
| 6 | Delay capacitor (Cd) | Connects external timing capacitor; charges at −5 µA to set reset delay |
| 7 | Output | Open-collector NPN output; sinks current when reset active (low), requires external pull-up |
| 8 | NC | No internal connection; must be left unconnected or tied to GND |
Key Features
| Feature | Design Value |
|---|---|
| Externally adjustable detection voltage | Set via resistor divider on Pin 2; enables monitoring of 2–15 V supplies using fixed 1.25 V reference |
| Capacitor-programmable delay | Delay time determined solely by Cd value and internal constant current; no trimming required |
| Low-threshold operation | Functional down to 0.67 V supply (RL = 2.2 kΩ); ensures valid reset assertion during severe brown-out |
| Temperature-stable reference | Detection voltage drift ≤ 0.01%/°C; maintains accuracy across −40 to +85 °C operating range |
| Open-collector output flexibility | Supports mixed-voltage systems: pull-up to any voltage ≤ VCC (2–17 V), independent of MCU reset rail |
Applications
| 3V Microcontroller Reset Supervision | Battery Voltage Monitoring |
|---|---|
|
Use Scenario: Monitors 3V supply rail of an MCU during power-up, brown-out, and shutdown sequences. IC Role / Device Role / Timing Role: Voltage detector and reset generator; asserts active-low reset until supply stabilizes above 2.66 V (set by R1/R2 divider). Use Value: Eliminates need for discrete comparator + RC timer; achieves ±4% detection accuracy and 3.4 ms typical delay with 0.01 µF Cd. |
Use Scenario: Tracks lithium-ion battery voltage to trigger low-battery warning or graceful shutdown before cutoff. IC Role / Device Role / Timing Role: Precision threshold detector; compares battery voltage (via divider) against 1.25 V reference and holds reset for configurable delay. Use Value: Enables accurate end-of-discharge detection at 2.8–3.0 V with minimal quiescent current (360–540 µA), extending battery life. |
| Industrial PLC Power Sequencing | Waveform Shaping for Control Signals |
|
Use Scenario: Ensures clean power-on reset for programmable logic controllers with multi-rail supplies (5V, 12V, 24V). IC Role / Device Role / Timing Role: Independent reset supervisor per rail; each REAR56957BGSM#HC0 monitors its assigned supply and asserts dedicated reset line. Use Value: Provides rail-specific reset timing with no cross-coupling; wide 2–17 V range accommodates auxiliary supplies without level-shifting. |
Use Scenario: Converts noisy or slow-rising control signals (e.g., from mechanical switches or sensors) into clean, debounced digital pulses. IC Role / Device Role / Timing Role: Delay waveform generator; uses Cd pin to stretch input transitions into precise, jitter-free output pulses. Use Value: Replaces RC+Schmitt trigger circuits; delivers consistent 1.6–7.0 ms delay (Cd = 0.01 µF) with <10 µs propagation delay (tPHL). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-detecting reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBZR | Fixed 3.3 V detection; no external resistor divider; SOT-23-3 package; no delay capacitor pin | Limited to single-voltage systems; unsuitable for adjustable thresholds or long delays | Choose when only 3.3 V reset is needed and board space is constrained |
| MAX6326UR29D3+ | 2.93 V fixed threshold; built-in 200 ms delay; no external Cd; 5-pin SOT-23 package | Provides factory-set delay; lacks user-adjustable timing or detection voltage | Choose for plug-and-play reset with guaranteed 200 ms hold time and no external components |
Compared with TLV809E33DBZR and MAX6326UR29D3+, the REAR56957BGSM#HC0 uniquely supports both adjustable detection voltage (2–15 V) and capacitor-scaled delay (ms to seconds) in a single 8-pin SOP, making it optimal for custom reset timing and multi-rail monitoring where flexibility outweighs component count minimization.
Availability
REAR56957BGSM#HC0 is available at Aetrix Electronics and suitable for 3V microcontroller reset supervision, battery voltage monitoring, industrial PLC power sequencing, and waveform shaping applications requiring stable component supply and long-term design continuity.
Supply support for REAR56957BGSM#HC0 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 global semiconductor leader specializing in microcontrollers, analog, power, and connectivity solutions for automotive, industrial, and IoT markets.
The REAR56957BGSM#HC0 belongs to Renesas' Voltage Detecting, System Resetting IC Series-designed specifically for reliable, low-power reset generation in resource-constrained embedded systems with variable supply voltages.
FAQ
What is the detection voltage accuracy of the REAR56957BGSM#HC0?
The REAR56957BGSM#HC0 has a detection voltage (VS) of 1.25 V (typical), with a tolerance of ±4% over temperature and supply variations. This accuracy applies to the internal 1.25 V reference; actual system detection voltage depends on resistor divider precision and input current error (≤500 nA), which must be accounted for in high-accuracy designs using the REAR56957BGSM#HC0.
How do I calculate the delay time for the REAR56957BGSM#HC0?
The delay time (tpd) of the REAR56957BGSM#HC0 is calculated as tpd ≈ 0.34 × Cd(pF) µs, where Cd is the external capacitor value in picofarads. For example, a 10 nF (10,000 pF) capacitor yields ~3.4 ms delay. The datasheet specifies Cd between 4700 pF and 10 µF; values outside this range risk timing inaccuracy or failure to respond to momentary dips, as documented for the REAR56957BGSM#HC0.
What is the minimum supply voltage required for the REAR56957BGSM#HC0 to operate?
The REAR56957BGSM#HC0 can maintain valid reset assertion (low-state output) down to a supply voltage (VCC) of 0.67 V (minimum, RL = 2.2 kΩ) - referred to as its threshold operating voltage (VOPL). This allows the REAR56957BGSM#HC0 to assert reset reliably during deep brown-out conditions before the host MCU loses functionality, ensuring controlled shutdown.
Can the REAR56957BGSM#HC0 monitor a supply voltage higher than its own VCC?
No - the REAR56957BGSM#HC0 input (Pin 2) must remain within its specified input voltage range: −0.3 V to VCC for VCC ≤ 7 V, or −0.3 V to 7.0 V for VCC > 7 V. To monitor higher supplies (e.g., 12 V), a resistor divider must scale the voltage down to ≤7.0 V before applying it to Pin 2; the REAR56957BGSM#HC0 itself cannot tolerate direct connection to voltages exceeding these limits.
What is the purpose of the NC pins on the REAR56957BGSM#HC0?
The REAR56957BGSM#HC0 has three NC (No Connection) pins: Pins 3, 5, and 8. These pins have no internal connection and must not be used for signal routing, grounding, or decoupling. They may be left floating or tied to GND for mechanical stability - but tying them to any active node risks unintended coupling or EMI, and does not affect REAR56957BGSM#HC0 functionality.
REAR56957BGSM#HC0 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 8-SOIC (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 1.6ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOP
REAR56957BGSM#HC0 FAQ
1.How can I place an order for REAR56957BGSM#HC0 through Aetrix?
Please submit a Request for Quotation (RFQ) for REAR56957BGSM#HC0 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 REAR56957BGSM#HC0 reliable?
The price and inventory of REAR56957BGSM#HC0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for REAR56957BGSM#HC0 is usually 5 days.
3.What payment methods are accepted for REAR56957BGSM#HC0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for REAR56957BGSM#HC0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for REAR56957BGSM#HC0?
REAR56957BGSM#HC0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your REAR56957BGSM#HC0 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 REAR56957BGSM#HC0?
For technical support, including REAR56957BGSM#HC0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your REAR56957BGSM#HC0 requirements.
6.How does Aetrix verify that REAR56957BGSM#HC0 is sourced from the original manufacturer or authorized distributors?
All REAR56957BGSM#HC0 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 REAR56957BGSM#HC0 meets industry standards.
7.What is the process for return or replacement of REAR56957BGSM#HC0?
All REAR56957BGSM#HC0 units undergo pre-shipment inspection (PSI). If there is an issue with REAR56957BGSM#HC0, 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 REAR56957BGSM#HC0 part is unused and in its original packaging.
Return procedure for REAR56957BGSM#HC0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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