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Diodes Incorporated ZR431C01L
- Part No.:
- ZR431C01L
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ZR431C01L.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:2,208
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Product details
Overview
ZR431C01L from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1% initial tolerance, 2.50 V reference voltage (typ), and ±72 ppm/°C temperature coefficient. It sinks 50 µA to 100 mA cathode current, supports programmable output voltages from 2.5 V to 20 V via external resistors, and operates across –40°C to +125°C - widely used in voltage monitoring and overvoltage protection circuits.
For engineers reviewing the ZR431C01L datasheet, ZR431C01L pinout, ZR431C01L application, or ZR431C01L equivalent, this page delivers verified electrical specs, SOT23 package details, real-world use cases, and validated alternative parts - all grounded in Diodes' DS33255 Rev. 9-2 datasheet and official ordering information.
Technical Context
The ZR431C01L implements a bandgap-referenced, temperature-compensated shunt regulation architecture with low dynamic impedance (≤0.75 Ω) and ultra-low reference input current (0.12–1.0 µA). Its design enables stable closed-loop feedback in both shunt and series configurations without external compensation under typical load capacitance conditions.
It features a programmable cathode voltage (VZ) set by two external resistors, where VOUT = VREF(1 + R1/R2). The device maintains <30 mV reference deviation over –40°C to +125°C and exhibits negative ΔVREF/ΔVZ sensitivity (–1.0 to –2.7 mV/V), enabling predictable error correction in feedback networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.50 V (typ), ±1% tolerance - sets precise regulation threshold for external resistor divider |
| Tempco | 72 ppm/°C max - ensures ≤30 mV reference drift over full industrial temperature range |
| IZ(MIN) | 35–50 µA - minimum cathode current required to maintain regulation at VREF |
| RZ | ≤0.75 Ω - low dynamic impedance improves transient response and loop stability |
| IZ Range | 50 µA to 100 mA - supports wide-range current sinking for diverse bias and protection topologies |
| VZ Range | 2.5 V to 20 V - programmable output enables flexible voltage setting without discrete Zener selection |
| IREF | 0.12–1.0 µA - ultra-low reference input current minimizes divider power loss and loading error |
Pinout & Package
SOT23-3 package (JEDEC TO-236AB), surface-mount, 3-pin configuration with exposed thermal pad not connected internally. Pin 1 = Cathode (K), Pin 2 = Anode (A), Pin 3 = Reference (REF). Pin 2 (Anode) is electrically tied to the internal substrate and must be connected to system ground for proper operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Output node for regulated voltage | Connected to positive rail or feedback point; sinks current to maintain VZ = VREF(1 + R1/R2) |
| Anode (Pin 2) | Ground reference terminal | Must be connected to system ground; serves as common return path for cathode and reference currents |
| Reference (Pin 3) | Internal bandgap reference input | Connects to voltage divider midpoint; senses feedback ratio to control cathode conduction |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable 2.5–20 V output | Enables single BOM item to replace multiple fixed Zeners across diverse supply rails |
| 1% initial tolerance (ZR431C01L) | Reduces calibration overhead in precision voltage monitors and protection thresholds |
| 72 ppm/°C tempco | Meets industrial-grade stability requirements without external trimming or compensation |
| 0.75 Ω dynamic impedance | Supports fast transient recovery in SMPS feedback loops and low-noise analog references |
| 50 µA min. regulation current | Allows ultra-low-power operation in battery-backed monitoring and standby circuits |
Applications
| Shunt Voltage Regulation | Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing 5 V or 12 V auxiliary rails in industrial PLC I/O modules where space and BOM count are constrained. IC Role / Device Role / Timing Role: Shunt regulator providing precise, temperature-stable reference for feedback network of linear post-regulator. Use Value: Replaces discrete 5.1 V Zener + series resistor with ±5% tolerance and >100 ppm/°C drift, improving long-term accuracy by 3×. |
Use Scenario: Detecting overvoltage on 24 V DC input to motor drive controller before enabling gate drivers. IC Role / Device Role / Timing Role: Threshold comparator element in discrete crowbar circuit, triggering SCR latch when VIN exceeds 27.5 V. Use Value: Programmable trip point (27.5 V = 2.5 × (1 + 10k/910Ω)) eliminates need for custom-trimmed voltage dividers or dedicated OV ICs. |
| Series Regulator Control | Voltage Monitor for MCU Reset |
|
Use Scenario: Setting output voltage of discrete NPN pass transistor regulator in telecom power shelf. IC Role / Device Role / Timing Role: Precision reference for op-amp error amplifier driving base of series pass transistor. Use Value: Enables 3.3 V ±1% output with <10 mV line/load regulation error, outperforming TL431-based designs in thermal stability. |
Use Scenario: Monitoring 3.3 V core supply of ARM Cortex-M7 microcontroller during cold start and brownout conditions. IC Role / Device Role / Timing Role: Adjustable reset threshold generator feeding open-drain output to MCU's nRESET pin. Use Value: Configured for 2.97 V trip (2.5 × (1 + 10k/51kΩ)), matching exact VDD tolerance spec - avoids false resets caused by fixed 3.0 V supervisors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V ref, ±1%, 92 ppm/°C tempco, 0.22 Ω RZ, 1–100 mA IZ | Higher RZ sensitivity to layout; requires ≥100 pF capacitor for stability in high-gain loops | Preferred where lower RZ and tighter production lot consistency are critical; higher cost and RoHS-6 only |
| AS431ASTZTR-G1 | 2.50 V ref, ±1%, 100 ppm/°C tempco, 1.0 Ω RZ, 100 µA–100 mA IZ | Wider IZ(MIN) range (100 µA vs. 35 µA); less suitable for ultra-low-power monitoring | Valid drop-in for non-critical industrial use; lacks AEC-Q200 qualification and Diodes' extended temp support |
Compared with TL431ACDBVR and AS431ASTZTR-G1, ZR431C01L offers superior temperature stability (72 vs. 92/100 ppm/°C), lower minimum regulation current (35 µA vs. 100 µA), and guaranteed RoHS-3/halogen-free compliance - making it optimal for high-reliability, low-power, and automotive-adjacent designs.
Availability
ZR431C01L is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage monitors, overvoltage protection circuits, and series regulator feedback networks requiring stable component supply and long-lifecycle support.
Supply support for ZR431C01L 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 manufacturer of discrete semiconductors and integrated circuits, specializing in high-performance, high-reliability components for power management, signal integrity, and protection applications.
ZR431 belongs to Diodes' precision reference product line, engineered specifically for industrial and automotive-adjacent systems requiring stable, programmable shunt regulation with minimal thermal drift and robust ESD performance.
FAQ
What is the minimum cathode current required for regulation in ZR431C01L?
The ZR431C01L requires a minimum cathode current (IZ(MIN)) of 35 µA to 50 µA to maintain regulation at VREF, per DS33255 Rev. 9-2 Electrical Characteristics table. This value is measured at VZ = VREF and ensures stable reference operation across temperature and process variation.
Can ZR431C01L be used in place of a standard Zener diode?
Yes - ZR431C01L replaces standard Zener diodes in applications needing improved voltage accuracy, lower temperature drift, and programmable output. Unlike passive Zeners, it requires an external resistor divider and draws only 0.12–1.0 µA at the REF pin, enabling higher-impedance, lower-power feedback networks.
Does ZR431C01L require an external capacitor for stability?
No external capacitor is required for basic shunt regulation. However, Diodes' datasheet recommends ≥100 pF load capacitance for stable operation in high-gain configurations (e.g., series regulators). Stability boundary data shows stable operation up to 1 µF with 100 mA cathode current, per Figure 6.
What is the maximum power dissipation for ZR431C01L in SOT23 package?
In SOT23 package, ZR431C01L has a maximum power dissipation (PD) of 330 mW at +25°C ambient, derating linearly above that temperature. This corresponds to ~132 mA at 2.5 V or ~16.5 mA at 20 V, assuming no PCB copper area enhancement - actual thermal performance depends on board layout and copper pour.
ZR431C01L 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
ZR431C01L FAQ
1.How can I place an order for ZR431C01L through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR431C01L 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 ZR431C01L reliable?
The price and inventory of ZR431C01L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431C01L is usually 5 days.
3.What payment methods are accepted for ZR431C01L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431C01L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR431C01L?
ZR431C01L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR431C01L 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 ZR431C01L?
For technical support, including ZR431C01L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431C01L requirements.
6.How does Aetrix verify that ZR431C01L is sourced from the original manufacturer or authorized distributors?
All ZR431C01L 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 ZR431C01L meets industry standards.
7.What is the process for return or replacement of ZR431C01L?
All ZR431C01L units undergo pre-shipment inspection (PSI). If there is an issue with ZR431C01L, 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 ZR431C01L part is unused and in its original packaging.
Return procedure for ZR431C01L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZR431C01L Tags
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TL431AIDBZR
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TL431BQDBZR
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AN431AN-ATRG1
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AZ431LBNTR-G1
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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