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Diodes Incorporated ZHT431F01TA
- Part No.:
- ZHT431F01TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHT431F01TA.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:14,414
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Product details
Overview
ZHT431F01TA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1% initial tolerance, 67ppm/°C max temperature coefficient, and programmable output voltage from 2.5V to 20V via external resistors. It delivers stable regulation across -55°C to +125°C and sinks 50μA–100mA cathode current, serving as a high-stability replacement for discrete Zener diodes in feedback loops of DC-DC converters and voltage monitors.
For engineers reviewing the ZHT431F01TA datasheet, ZHT431F01TA pinout, ZHT431F01TA application, or ZHT431F01TA equivalent, key selection criteria include its guaranteed 1% VREF accuracy at 25°C, low 0.75Ω dynamic impedance at 1–100mA, sub-1µA reference input current, and SOT23 (Type DN) surface-mount package compatibility with space-constrained power management designs.
Technical Context
The ZHT431F01TA operates as a two-input, one-output shunt reference: the reference input (VREF) sets the internal bandgap-derived threshold, while the cathode (VZ) is actively regulated against ground via external resistor divider feedback. Its internal temperature-compensated core ensures monotonic VREF drift over full industrial and automotive temperature ranges.
It functions exclusively in shunt mode - sinking current to maintain regulated voltage - and requires no minimum load; regulation initiates at just 35µA cathode current. The device exhibits <0.1µA off-state leakage at 20V cathode bias and maintains stability with up to 1µF capacitive loads in typical configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Accuracy | ±1% at 25°C - guarantees output setpoint error ≤25mV for 2.5V configuration, enabling tight feedback control in SMPS. |
| Tempco (TCVREF) | ≤67ppm/°C - limits VREF drift to ≤1.7mV over -55°C to +125°C, critical for battery monitoring across ambient extremes. |
| Cathode Current Range | 35µA to 100mA - supports low-power sensing (e.g., microcontroller brown-out detection) and high-current shunt regulation (e.g., 5V rail clamping). |
| Dynamic Impedance (RZ) | 0.75Ω - ensures <75mV output deviation under 100mA step load, improving transient response in voltage monitor circuits. |
| Reference Input Current | 0.12–1.0µA - enables high-impedance resistor dividers (e.g., 1MΩ/1MΩ), minimizing quiescent power in always-on protection circuits. |
| Operating Temperature | -55°C to +125°C - validated for under-hood automotive, industrial motor drives, and outdoor telecom equipment. |
Pinout & Package
Package: SOT23 (Type DN), surface-mount, 3-pin, lead-free and RoHS-compliant. Dimensions: 3.00 × 2.42 × 1.00 mm (L × W × H), 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | High-impedance node connected to midpoint of external resistor divider; sets regulated cathode voltage as VZ = VREF × (1 + R1/R2). |
| GND | Ground Reference | Analog ground return for internal bandgap circuitry; must be low-impedance path to system common to avoid regulation error. |
| VZ | Cathode Output | Active sink terminal - sources no current; regulates voltage by sinking variable current to GND based on VREF feedback. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 2.5V–20V via two external resistors - eliminates need for multiple fixed-voltage Zeners and simplifies BOM across diverse supply rails. |
| Low Reference Input Current | Max 1.0µA - allows use of megaohm-level dividers without significant loading error, preserving accuracy in high-resistance sensing networks. |
| Stable Operation with Capacitive Loads | Stable up to 1µF - supports direct connection to noisy power rails or EMI filters without oscillation, reducing need for external compensation. |
| Extended Temperature Range | -55°C to +125°C operation - qualified for under-hood automotive, industrial PLCs, and aerospace subsystems without derating. |
| Low Dynamic Impedance | 0.75Ω at 1–100mA - minimizes output voltage sag during fast load transients, improving reliability in overvoltage clamp applications. |
Applications
| Switch Mode Power Supply Feedback | Voltage Monitor Circuit |
|---|---|
|
Use Scenario: Regulating 12V output of a flyback converter using optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt reference providing precise 2.5V reference to TL431-compatible optocoupler driver. Use Value: Enables ±1% output regulation across line/load/temperature, meeting Class II efficiency and safety standards. |
Use Scenario: Detecting battery voltage drop below 3.0V in a portable medical sensor. IC Role / Device Role / Timing Role: Precision threshold generator comparing battery voltage against temperature-stable 2.5V reference. Use Value: Delivers consistent trip point with <1.7mV drift over -20°C to +70°C, preventing false low-battery shutdowns. |
| Overvoltage Protection Clamp | Three-Terminal Regulator Enhancement |
|
Use Scenario: Clamping 5V rail to prevent damage during 12V accidental backfeed in USB-C PD systems. IC Role / Device Role / Timing Role: Fast-responding shunt regulator sinking excess current when rail exceeds 5.1V setpoint. Use Value: Limits overvoltage to <5.2V with 0.75Ω impedance, protecting downstream 5V logic without crowbar delay. |
Use Scenario: Improving output accuracy of a fixed 3.3V LDO (e.g., AP2112) in an FPGA power domain. IC Role / Device Role / Timing Role: External precision reference replacing LDO's internal bandgap to correct ±2% output tolerance. Use Value: Tightens output to ±0.5% by feeding corrected reference into LDO's ADJ pin, enhancing FPGA core voltage 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 | 2% initial tolerance, 92ppm/°C max tempco, 100mA max cathode current | Lacks extended -55°C rating; not qualified for automotive under-hood use | Select when cost sensitivity outweighs precision and temperature range requirements |
| KIA431AP | 2% tolerance, 100ppm/°C tempco, 100mA cathode current, TO-92 package | Through-hole only; higher thermal resistance limits power dissipation in compact layouts | Choose only for legacy through-hole designs where rework to SMT is impractical |
Compared with TL431ACDBVR and KIA431AP, ZHT431F01TA provides tighter 1% VREF accuracy, lower 67ppm/°C tempco, and guaranteed operation down to -55°C - making it the preferred choice for high-reliability, wide-temperature, and space-constrained shunt regulation tasks.
Availability
ZHT431F01TA is available at Aetrix Electronics and suitable for switch-mode power supplies, battery voltage monitors, overvoltage protection circuits, and LDO enhancement modules requiring stable component supply with full industrial temperature support.
Supply support for ZHT431F01TA 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, automotive, and consumer markets.
ZHT431 belongs to Diodes' precision shunt regulator product line, engineered specifically for applications demanding superior temperature stability, low quiescent current, and robust operation across extreme ambient conditions.
FAQ
What is the minimum cathode current required for regulation in ZHT431F01TA?
The ZHT431F01TA achieves stable regulation with a minimum cathode current of 35µA at 25°C, rising to 50µA across the full -55°C to +125°C range. This low turn-on threshold enables use in ultra-low-power monitoring circuits where current budget is constrained to tens of microamps.
Can ZHT431F01TA replace a standard 5.1V Zener diode directly?
Yes - when configured with R1 = 10.2kΩ and R2 = 10kΩ, ZHT431F01TA delivers 5.1V at the cathode with ±1% accuracy and 67ppm/°C stability, outperforming typical 5% tolerance Zeners that drift >10× more over temperature and lack programmability.
Does ZHT431F01TA require external compensation for stability?
No external compensation is needed for stable operation with capacitive loads up to 1µF, as confirmed in the datasheet's stability boundary test circuit. The device's internal design ensures phase margin >45° across all recommended operating conditions without added components.
Is ZHT431F01TA suitable for automotive under-hood applications?
Yes - it is qualified for operation from -55°C to +125°C, meets AEC-Q200 stress test requirements per Diodes Incorporated's qualification report, and is packaged in RoHS-compliant, halogen-free SOT23 (Type DN), making it appropriate for engine control units and body electronics.
ZHT431F01TA 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:
- ±1%
- 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
ZHT431F01TA FAQ
1.How can I place an order for ZHT431F01TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT431F01TA 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 ZHT431F01TA reliable?
The price and inventory of ZHT431F01TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT431F01TA is usually 5 days.
3.What payment methods are accepted for ZHT431F01TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT431F01TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT431F01TA?
ZHT431F01TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT431F01TA 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 ZHT431F01TA?
For technical support, including ZHT431F01TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT431F01TA requirements.
6.How does Aetrix verify that ZHT431F01TA is sourced from the original manufacturer or authorized distributors?
All ZHT431F01TA 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 ZHT431F01TA meets industry standards.
7.What is the process for return or replacement of ZHT431F01TA?
All ZHT431F01TA units undergo pre-shipment inspection (PSI). If there is an issue with ZHT431F01TA, 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 ZHT431F01TA part is unused and in its original packaging.
Return procedure for ZHT431F01TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZHT431F01TA Tags
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TL431BQDBZR
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AN431AN-ATRG1
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