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Diodes Incorporated ZR431F01-7
- Part No.:
- ZR431F01-7
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZR431F01-7.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
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Product details
Overview
ZR431F01-7 from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1% initial tolerance, 55 ppm/°C max temperature coefficient, and 2.5 V to 20 V programmable output voltage via external resistors. It sinks 50 μA to 100 mA, features 0.75 Ω dynamic impedance, and operates across –40°C to +85°C - used in voltage monitoring and overvoltage protection circuits in industrial power supplies.
For engineers reviewing the ZR431F01-7 datasheet, ZR431F01-7 pinout, ZR431F01-7 application, or ZR431F01-7 equivalent, key selection criteria include reference voltage stability over temperature, cathode current regulation threshold, dynamic impedance at DC, and SOT23 package thermal derating behavior in shunt regulator designs.
Technical Context
The ZR431F01-7 implements a bandgap-referenced error amplifier with internal temperature compensation, enabling stable 2.5 V reference voltage across –40°C to +85°C with ≤17 mV total deviation. Its cathode-anode configuration allows direct replacement of discrete Zener diodes in feedback networks.
It operates as a two-terminal shunt device when anode is grounded, or as a three-terminal regulator with separate reference input (VREF), cathode (VZ), and anode (GND) terminals. Output voltage programming follows VOUT = VREF × (1 + R1/R2), where VREF = 2.50 V (typ) at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.50 V (typ) at 25°C; sets base reference for programmable output voltage calculation |
| Tolerance | ±1% at 25°C; defines initial accuracy of reference voltage before trimming or calibration |
| Tempco | Max 55 ppm/°C; ensures ≤17 mV total VREF drift over full –40°C to +85°C operating range |
| IZ(MIN) | 50 µA (max); minimum cathode current required to maintain regulation at VREF |
| RZ | 0.75 Ω (at DC); low dynamic impedance enables stable regulation under fast load transients |
| IZ Range | 50 µA to 100 mA; supports wide-range current sinking for both low-power monitoring and higher-current shunt applications |
| VZ Max | 20 V; maximum cathode-to-anode voltage before exceeding absolute rating or degrading performance |
Pinout & Package
Package: SOT23 - surface-mount, 3-pin plastic package with 1.3 mm body width, 2.9 mm length, and 0.915 mm height; rated for 330 mW power dissipation at 25°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Anode) | Reference ground node | Common return path for reference input current (IREF) and cathode sink current (IZ); must be connected to system GND |
| Pin 2 (Cathode) | Output voltage node | Sinks regulated current to maintain programmed VOUT; connects to feedback point in SMPS or voltage monitor circuit |
| Pin 3 (VREF) | Reference input terminal | High-impedance (≤1.0 µA IREF) input that senses divider voltage; determines regulation setpoint when VREF = 2.50 V |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5 V to 20 V via external resistor divider; eliminates need for multiple fixed Zener values |
| Low reference input current | 0.12–1.0 µA typical; minimizes loading error on resistor divider network |
| Temperature-compensated reference | ≤17 mV total VREF deviation over –40°C to +85°C; enables stable operation without external compensation |
| Low-noise regulation | Sub-mV output noise; suitable for precision feedback loops in isolated DC-DC converters |
| RoHS-compliant & green compound | Lead-free finish and bromine/antimony-free molding compound per EU Directive 2002/95/EC |
Applications
| Shunt Regulator | Overvoltage Protection |
|---|---|
|
Use Scenario: Stabilizing output voltage in low-power linear regulators or auxiliary bias rails. IC Role / Device Role / Timing Role: Shunt regulator providing precise voltage reference and current sink capability. Use Value: Replaces discrete Zener diodes with ±1% tolerance and <55 ppm/°C drift, improving long-term stability in unregulated inputs. |
Use Scenario: Detecting excessive rail voltage in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Voltage monitor triggering crowbar or shutdown circuit when VOUT exceeds threshold. Use Value: Programmable trip point (e.g., 12.5 V using 2.5 V reference + 4:1 divider) with <17 mV temp-induced error over full operating range. |
| Switch Mode Power Supply Feedback | Series Regulator Reference |
|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters. IC Role / Device Role / Timing Role: Precision shunt reference in optocoupler feedback loop. Use Value: 0.75 Ω dynamic impedance ensures minimal phase shift in control loop, supporting stable compensation up to 100 kHz switching frequencies. |
Use Scenario: Setting output voltage in high-accuracy series pass regulator with external transistor. IC Role / Device Role / Timing Role: Adjustable reference source driving base/gate of pass element. Use Value: Enables fine-tuned output (e.g., 5.0 V, 12.0 V) with 1% initial accuracy and low tempco, reducing need for post-assembly trimming. |
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 | 2.5 V reference, ±0.5% tolerance, 92 ppm/°C max tempco, 100 mA sink, SOT23-5 | Requires external capacitor for stability in some configurations; higher tempco increases drift in wide-temp environments | Preferred where tighter initial tolerance is critical and thermal budget allows higher drift |
| KA431AZTA | 2.5 V reference, ±2% tolerance, 100 ppm/°C max tempco, 100 mA sink, TO-92 | Through-hole package limits board density; wider tolerance reduces accuracy in precision feedback paths | Selected for cost-sensitive, non-critical voltage monitoring where SMT is not required |
Compared with TL431ACDBVR and KA431AZTA, the ZR431F01-7 offers superior temperature stability (55 vs. 92/100 ppm/°C) and tighter initial tolerance than KA431AZTA, while maintaining SOT23 footprint compatibility and lower dynamic impedance for improved transient response in compact power designs.
Availability
ZR431F01-7 is available at Aetrix Electronics and suitable for industrial power supplies, embedded voltage monitors, and overvoltage protection circuits requiring stable component supply, consistent parametric performance, and RoHS-compliant packaging.
Supply support for ZR431F01-7 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 analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for industrial and consumer markets.
The ZR431 belongs to Diodes' precision shunt regulator product line, designed specifically to replace legacy Zener diodes with enhanced accuracy, temperature stability, and programmability in feedback and protection circuits.
FAQ
What is the minimum cathode current required for regulation in ZR431F01-7?
The ZR431F01-7 requires a minimum cathode current (IZ(MIN)) of 50 µA to maintain regulation at its reference voltage. This value is specified at VZ = VREF and ensures stable operation even under light-load conditions in voltage monitor or feedback applications.
Can ZR431F01-7 be used in place of a standard Zener diode?
Yes - the ZR431F01-7 replaces standard Zener diodes in applications requiring improved accuracy and temperature stability. Unlike passive Zeners, it uses an active bandgap reference and error amplifier, delivering ±1% tolerance and ≤55 ppm/°C drift versus typical Zener tolerances of ±5–10% and >100 ppm/°C drift.
How does the SOT23 package affect thermal performance?
In the SOT23 package, the ZR431F01-7 has a 330 mW power dissipation limit at 25°C ambient, derating linearly to zero at 150°C junction temperature. Its thermal resistance (θJA) is approximately 379°C/W, meaning 100 mA at 10 V drop (1 W) exceeds safe operation unless PCB copper area or airflow is added for heat spreading.
Is external compensation required for stability in feedback loops?
No external compensation is required for basic shunt regulation, but stability analysis is needed when used in optocoupler feedback loops. The device's open-loop gain rolls off above 100 kHz, and load capacitance >1 nF may induce peaking; typical designs use 100 pF–1 nF ceramic capacitors across R1/R2 for phase margin improvement.
ZR431F01-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Strip
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZR431F01-7 FAQ
1.How can I place an order for ZR431F01-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ZR431F01-7 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 ZR431F01-7 reliable?
The price and inventory of ZR431F01-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZR431F01-7 is usually 5 days.
3.What payment methods are accepted for ZR431F01-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZR431F01-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZR431F01-7?
ZR431F01-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZR431F01-7 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 ZR431F01-7?
For technical support, including ZR431F01-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZR431F01-7 requirements.
6.How does Aetrix verify that ZR431F01-7 is sourced from the original manufacturer or authorized distributors?
All ZR431F01-7 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 ZR431F01-7 meets industry standards.
7.What is the process for return or replacement of ZR431F01-7?
All ZR431F01-7 units undergo pre-shipment inspection (PSI). If there is an issue with ZR431F01-7, 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 ZR431F01-7 part is unused and in its original packaging.
Return procedure for ZR431F01-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZR431F01-7 Tags
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