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Diodes Incorporated ZHT431F02TA
- Part No.:
- ZHT431F02TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHT431F02TA.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:5,013
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Product details
Overview
ZHT431F02TA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 2% initial reference voltage tolerance, programmable output voltage from 2.5 V to 20 V via external resistors, ±67 ppm/°C max temperature coefficient, and 50 µA–100 mA cathode current sink capability across –55°C to +125°C. It replaces standard Zener diodes in high-stability voltage monitoring and protection circuits.
For engineers reviewing the ZHT431F02TA datasheet, ZHT431F02TA pinout, ZHT431F02TA application, or ZHT431F02TA equivalent, key selection criteria include its SOT23 (Type DN) package, low dynamic impedance (≤0.75 Ω), wide operating temperature range, and guaranteed regulation down to 35 µA cathode current.
Technical Context
The ZHT431F02TA operates as a two-input, one-output shunt regulator: the reference input (VREF) sets the internal bandgap-derived 2.5 V threshold, while the cathode (VZ) sinks current to maintain regulated voltage across an external resistor divider. Its internal temperature-compensated circuitry ensures stable VREF over –55°C to +125°C without external components.
It functions as a programmable voltage comparator with hysteresis-free regulation, where output voltage is defined by VOUT = VREF × (1 + R1/R2). Dynamic impedance remains ≤0.75 Ω at 1 mA–100 mA, enabling fast transient response in feedback loops of SMPS and overvoltage monitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | 2% (±50 mV at 2.5 V); defines absolute accuracy of regulation setpoint under nominal conditions |
| Tempco (TCVREF) | Max 67 ppm/°C; limits drift-induced error to <±1.5 mV over full –55°C to +125°C range |
| Cathode Current Range | 35 µA to 100 mA; supports low-power sensing and high-current shunt regulation without external boost |
| Dynamic Impedance (RZ) | ≤0.75 Ω at 1–100 mA; ensures minimal output voltage deviation during load transients |
| Operating Temp Range | –55°C to +125°C; validated for automotive under-hood and industrial control environments |
| Max Cathode Voltage | 20 V; enables direct use in 12 V and 15 V rail monitoring without level-shifting |
| Reference Input Current | 0.12–1.0 µA typical; reduces divider resistor power loss and thermal drift in precision designs |
Pinout & Package
Package: SOT23 (Type DN), surface-mount, 3-pin, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Internal 2.5 V bandgap node; connected to midpoint of external resistor divider to set output voltage |
| GND | Ground Terminal | Return path for reference input current and cathode sink current; must be low-impedance |
| VZ | Cathode Output | Current-sinking terminal; regulates voltage between this pin and GND by adjusting sink current |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | 2.5 V to 20 V via two external resistors; eliminates need for multiple fixed-voltage Zeners |
| Low Reference Input Current | 0.12–1.0 µA; allows use of high-value divider resistors (>1 MΩ), minimizing power consumption |
| Stable Over Full Temperature Range | Temperature-compensated bandgap core; no external compensation required from –55°C to +125°C |
| Low Output Noise | Typical noise <10 µVRMS; suitable for precision feedback paths in analog power supplies |
| High Current Sink Capability | 100 mA continuous cathode current; supports direct driving of optocoupler LEDs or small MOSFET gates |
Applications
| Switch Mode Power Supply Feedback | Voltage Monitor for Battery Systems |
|---|---|
Use Scenario: Primary-side feedback loop in isolated flyback converters using optocoupler coupling. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise, temperature-stable reference for TL431-compatible optocoupler drive. Use Value: Enables accurate output voltage regulation within ±1.5% over line, load, and temperature-without secondary-side sensing. |
Use Scenario: Monitoring 3.3 V, 5 V, or 12 V battery rails in portable medical devices. IC Role / Device Role / Timing Role: Precision voltage threshold detector feeding comparator or microcontroller ADC input. Use Value: Delivers stable 2.5 V reference for ratiometric measurements, reducing calibration drift over –40°C to +85°C operation. |
| Overvoltage Protection Circuit | Shunt Regulator for Low-Power Sensors |
Use Scenario: Clamp circuit protecting downstream ICs from transient overvoltage on 5 V or 12 V supply lines. IC Role / Device Role / Timing Role: Fast-responding shunt element triggered when sensed voltage exceeds preset threshold. Use Value: Limits clamping voltage variation to <±200 mV across temperature, improving protection reliability vs. standard Zeners. |
Use Scenario: Providing stable bias voltage to MEMS pressure sensors or analog front-ends in IoT nodes. IC Role / Device Role / Timing Role: Low-quiescent-current shunt regulator powering sensor signal chain from coin-cell or energy-harvesting source. Use Value: Draws only 0.12 µA reference current, extending battery life while maintaining 0.5% output stability. |
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 | 1% VREF tolerance, 92 ppm/°C max tempco, 100 mA max cathode current, SOT23-5 package | Requires 5-pin layout; higher tempco increases drift in extended temperature designs | Preferred where tighter initial tolerance is critical and board space permits larger footprint |
| AS431ASTZT | 2% tolerance, 50 ppm/°C max tempco, 100 mA cathode current, SOT23-3 package | Lower tempco improves long-term stability but limited availability and longer lead times | Best for new designs prioritizing thermal stability in harsh environments with sourcing flexibility |
Compared with TL431ACDBVR and AS431ASTZT, ZHT431F02TA offers optimal balance of SOT23-3 compatibility, 67 ppm/°C tempco, and production-ready availability-making it ideal for cost-sensitive, space-constrained industrial power monitors.
Availability
ZHT431F02TA is available at Aetrix Electronics and suitable for switch-mode power supply feedback, battery voltage monitoring, overvoltage protection, and low-power sensor biasing requiring stable component supply and consistent parametric performance.
Supply support for ZHT431F02TA 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.
ZHT431 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy, wide-temperature voltage reference and regulation in automotive, industrial, and computing power systems.
FAQ
What is the minimum cathode current required for regulation in ZHT431F02TA?
The ZHT431F02TA requires a minimum cathode current (IZMIN) of 35 µA to maintain regulation at VREF, verified across –55°C to +125°C per DS32157 Rev. 12–2. Below this, the device exits regulation and VZ follows the external divider ratio without active control.
Can ZHT431F02TA replace a standard 5.1 V Zener diode directly?
Yes-when configured with R1 = 10.2 kΩ and R2 = 10 kΩ, ZHT431F02TA delivers 5.1 V at the cathode with ±100 mV total error (including tolerance and tempco), outperforming typical 5% Zeners in stability, noise, and temperature drift.
Does ZHT431F02TA require external capacitors for stability?
No external capacitor is required for basic shunt regulation. However, a 0.01 µF ceramic capacitor placed between VREF and GND improves noise immunity in high-noise environments, and a 100 pF–1 nF capacitor from VZ to GND enhances pulse response in overvoltage clamp applications.
Is ZHT431F02TA qualified for automotive applications?
ZHT431F02TA is not AEC-Q200 qualified, but its –55°C to +125°C operating range, Pb-free construction, and tested reliability per Diodes' internal stress protocols make it suitable for non-safety-critical automotive subsystems such as infotainment power rails and body control module sensors.
ZHT431F02TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 20 V
- Current - Output:
- 100 mA
- Tolerance:
- ±2%
- Temperature Coefficient:
- 67ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 50 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZHT431F02TA FAQ
1.How can I place an order for ZHT431F02TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT431F02TA 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 ZHT431F02TA reliable?
The price and inventory of ZHT431F02TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT431F02TA is usually 5 days.
3.What payment methods are accepted for ZHT431F02TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT431F02TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT431F02TA?
ZHT431F02TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT431F02TA 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 ZHT431F02TA?
For technical support, including ZHT431F02TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT431F02TA requirements.
6.How does Aetrix verify that ZHT431F02TA is sourced from the original manufacturer or authorized distributors?
All ZHT431F02TA 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 ZHT431F02TA meets industry standards.
7.What is the process for return or replacement of ZHT431F02TA?
All ZHT431F02TA units undergo pre-shipment inspection (PSI). If there is an issue with ZHT431F02TA, 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 ZHT431F02TA part is unused and in its original packaging.
Return procedure for ZHT431F02TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZHT431F02TA Tags
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