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Diodes Incorporated ZR431C01
- Part No.:
- ZR431C01
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ZR431C01.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:1,127
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Product details
Overview
ZR431C01 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1% initial tolerance, programmable output voltage (2.5–20 V), ±72 ppm/°C temperature coefficient, and 50 µA to 100 mA cathode current capability - used in voltage monitoring, overvoltage protection, and switch-mode power supply feedback loops.
For engineers reviewing the ZR431C01 datasheet, ZR431C01 pinout, ZR431C01 application, or ZR431C01 equivalent, this page delivers verified electrical specs, SOT23 package details, real-world use cases, and validated alternative parts for precision shunt regulation design-in.
Technical Context
The ZR431C01 operates as a two-input, one-output voltage reference comparator with internal bandgap reference and transconductance amplifier. Its cathode voltage is regulated by external resistor divider feedback to the reference input (VREF), enabling precise setpoint control independent of load current within 50 µA–100 mA range.
It features temperature-compensated operation across –40°C to +125°C, low dynamic impedance (≤0.75 Ω at VZ = VREF), and stable performance up to 1 MHz - making it suitable for closed-loop feedback in DC-DC converters and analog monitoring circuits where Zener diode limitations (e.g., poor tempco, high noise) are unacceptable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (Typ) | 2.50 V - stable internal reference voltage used to set output via external resistors |
| Tolerance | ±1% - ensures output voltage accuracy without trimming in production |
| Tempco (Max) | 72 ppm/°C - limits drift to ≤2.1 mV over full –40°C to +125°C range |
| IZ(MIN) | 35–50 µA - minimum cathode current required to maintain regulation |
| RZ (Dyn) | ≤0.75 Ω - low output impedance enables fast transient response in feedback paths |
| IZ Range | 50 µA to 100 mA - supports wide load current variation while maintaining regulation |
| VZ Range | 2.5 V to 20 V - programmable output via R1/R2 divider per VOUT = VREF × (1 + R1/R2) |
Pinout & Package
SOT23-3L surface-mount package (JEDEC TO-236AB); compact footprint (2.9 mm × 1.3 mm × 1.0 mm), moisture sensitivity level 1, matte tin-plated leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Regulated output node | Connects to positive rail; sinks current to maintain VZ at programmed value |
| Anode (Pin 2) | Ground reference | Common return path for reference and cathode currents; must be low-impedance |
| Reference (Pin 3) | Feedback input | High-impedance (≤1.0 µA) node sensing voltage divider output; sets regulation point |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5–20 V via two external resistors - eliminates need for multiple fixed-voltage Zeners |
| Low reference input current | 0.12–1.0 µA - minimizes divider resistor power loss and improves efficiency |
| Low dynamic impedance | ≤0.75 Ω - maintains tight regulation under fast load transients in SMPS feedback |
| Wide operating temperature | –40°C to +125°C - qualified for industrial and automotive ambient conditions |
| RoHS/Green compliance | Lead-free, halogen-free, antimony-free - meets IEC 61249-2-21 and JEDEC J-STD-609A Class 1 |
Applications
| Shunt Regulator | Overvoltage Protection |
|---|---|
|
Use Scenario: Providing stable 5.0 V bias for analog sensor interface in industrial PLC module. IC Role / Device Role / Timing Role: Shunt regulator sinking excess current to clamp rail voltage when input exceeds 5.0 V. Use Value: Replaces 5.1 V Zener with ±1% tolerance and 72 ppm/°C drift - reduces calibration drift by >60% vs. standard Zener. |
Use Scenario: Monitoring 12 V battery rail in automotive telematics unit. IC Role / Device Role / Timing Role: Reference input triggers comparator when VBAT > 13.2 V, disabling charging circuit. Use Value: Programmable threshold (13.2 V = 2.5 V × (1 + 4.28kΩ/1kΩ)) enables precise trip point without custom ICs. |
| SMPS Feedback | Voltage Monitor |
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converter powering PoE PD. IC Role / Device Role / Timing Role: Sets feedback reference for optocoupler-driven TL431 replacement in isolated loop. Use Value: 0.75 Ω dynamic impedance improves loop stability margin vs. 10 Ω Zener; supports >100 kHz bandwidth. |
Use Scenario: Undervoltage lockout (UVLO) for microcontroller reset in medical IoT sensor node. IC Role / Device Role / Timing Role: Reference input tied to resistor divider from 3.3 V LDO; asserts reset below 2.8 V. Use Value: 1% tolerance ensures UVLO threshold stays within ±28 mV - avoids false resets during brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | ±0.5% initial tolerance, 39 ppm/°C tempco, 100 mA IZ, SOT23-3 | Higher accuracy and lower drift; requires tighter layout for stability | Preferred for high-precision feedback where cost premium is acceptable |
| KIA431AP | ±2% tolerance, 100 ppm/°C tempco, 100 mA IZ, SOT23-3 | Lower accuracy, higher drift; wider supply voltage margin (up to 36 V) | Selected for cost-sensitive industrial controls where 2% tolerance is sufficient |
Compared with ZR431C01, TL431BIDBZR offers superior accuracy and thermal stability but demands stricter PCB layout for phase margin; KIA431AP trades precision for broader voltage headroom and lower BOM cost in non-critical regulation tasks.
Availability
ZR431C01 is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery monitors, and medical sensor interfaces requiring stable component supply with traceable sourcing and lifecycle continuity.
Supply support for ZR431C01 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
Diodes Incorporated is a global semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.
ZR431 belongs to Diodes' precision reference product line, designed specifically for high-stability shunt regulation in space-constrained, thermally demanding environments such as automotive ECUs and industrial SMPS.
FAQ
What is the minimum cathode current needed for ZR431C01 to regulate?
The ZR431C01 requires a minimum cathode current (IZ(MIN)) of 35–50 µA to maintain regulation at VZ = VREF. Below this, the device exits regulation and behaves like an open circuit. This value is confirmed in the Electrical Characteristics table (DS33255 Rev. 9-2, p.2) and applies across –40°C to +125°C.
Can ZR431C01 replace a standard Zener diode directly?
Yes - ZR431C01 can replace Zener diodes in most shunt regulation roles, but requires two external resistors to set output voltage and has different pinout (Cathode-Anode-Reference vs. Anode-Cathode). It offers superior temperature stability (72 ppm/°C vs. typical 5000 ppm/°C for Zeners) and lower dynamic impedance (0.75 Ω vs. 10–100 Ω).
What is the maximum cathode voltage rating for ZR431C01?
The absolute maximum cathode voltage (VZ) for ZR431C01 is 20 V, as specified in the Absolute Maximum Ratings table (DS33255 Rev. 9-2, p.2). Exceeding this risks permanent damage. Recommended operating VZ is 2.5–20 V, with full specification guaranteed only up to 20 V.
Is ZR431C01 qualified for automotive applications?
ZR431C01 itself is not AEC-Q101 qualified; however, Diodes offers automotive-grade variants (e.g., ZR431xTA series) manufactured in IATF 16949-certified facilities. For automotive designs, consult Diodes' Automotive Product Definitions page and request PPAP documentation before qualification.
ZR431C01 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 20 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 55ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92
ZR431C01 FAQ
1.How can I place an order for ZR431C01 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR431C01 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 ZR431C01 reliable?
The price and inventory of ZR431C01 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431C01 is usually 5 days.
3.What payment methods are accepted for ZR431C01?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431C01 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR431C01?
ZR431C01 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR431C01 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 ZR431C01?
For technical support, including ZR431C01 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431C01 requirements.
6.How does Aetrix verify that ZR431C01 is sourced from the original manufacturer or authorized distributors?
All ZR431C01 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 ZR431C01 meets industry standards.
7.What is the process for return or replacement of ZR431C01?
All ZR431C01 units undergo pre-shipment inspection (PSI). If there is an issue with ZR431C01, 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 ZR431C01 part is unused and in its original packaging.
Return procedure for ZR431C01:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZR431C01 Tags
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