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Diodes Incorporated ZHT431F02TC
- Part No.:
- ZHT431F02TC
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHT431F02TC.pdf
- Description:
- IC VREF SHUNT ADJ 2% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:4,559
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Product details
Overview
ZHT431F02TC from Diodes Incorporated is an adjustable precision shunt regulator in SOT23 (Type DN) package, functioning as a programmable 2.5–20 V voltage reference with ±2% initial tolerance, 67 ppm/°C max temperature coefficient, and 50 µA–100 mA cathode current capability. It operates across –55°C to +125°C and replaces discrete Zener diodes in high-stability feedback loops for DC-DC converters and overvoltage protection circuits.
For engineers reviewing the ZHT431F02TC datasheet, ZHT431F02TC pinout, ZHT431F02TC application, or ZHT431F02TC equivalent, key selection criteria include its programmable output voltage range, low dynamic impedance (≤0.75 Ω), wide temperature stability, and SOT23-compatible footprint for space-constrained power management designs.
Technical Context
The ZHT431F02TC implements a bandgap-referenced, temperature-compensated shunt regulator architecture with internal reference voltage (VREF = 2.50 V typ.) and high-gain error amplifier. Its regulation relies on external resistor divider feedback between cathode (VZ), reference (VREF), and anode (GND) terminals.
It delivers stable regulation under varying load and line conditions: dynamic impedance remains ≤0.75 Ω at 1–100 mA cathode current, and reference voltage deviation is limited to ±30 mV over –55°C to +125°C. Off-state cathode leakage is ≤0.1 µA at 20 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.50 V typical; sets minimum programmable output voltage when used with external resistors |
| Voltage Range | 2.5–20 V programmable; enables flexible feedback design without changing IC |
| Tolerance | ±2% (ZHT431F02TC); defines initial accuracy of reference voltage at 25°C |
| Tempco | ≤67 ppm/°C; ensures <±30 mV total drift over full –55°C to +125°C operating range |
| Cathode Current | 50 µA–100 mA; supports both low-power monitoring and high-current shunt regulation |
| Dynamic Impedance | ≤0.75 Ω; maintains tight output regulation under fast load transients |
| Operating Temp | –55°C to +125°C; qualified for automotive under-hood and industrial control environments |
Pinout & Package
Package: SOT23 (Type DN), surface-mount, 3-terminal plastic package with standard 0.95 mm lead pitch and 2.80 × 2.10 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (VZ) | Output node / regulated voltage point | Connected to power rail being monitored or regulated; sinks current to maintain set voltage |
| Reference (VREF) | Feedback input / precision reference node | Internally biased at 2.50 V; connected to resistor divider midpoint for voltage programming |
| Anode (GND) | Ground return / current sink reference | Provides common return path for cathode current; must be low-impedance ground connection |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Voltage | Set precisely from 2.5 V to 20 V using two external resistors-no fixed-voltage variants required |
| Low Dynamic Impedance | ≤0.75 Ω ensures minimal output voltage shift during 1–100 mA cathode current changes |
| Wide Temperature Stability | Guaranteed operation from –55°C to +125°C with ≤±30 mV VREF drift-suitable for harsh environments |
| Low Reference Input Current | 0.12–1.0 µA at VREF enables high-resistance feedback dividers without accuracy loss |
| Lead-Free & Green Compliance | Fully RoHS 3 compliant, halogen- and antimony-free per Diodes Inc. specification (<900 ppm Br/Cl, <1000 ppm Sb) |
Applications
| Switch Mode Power Supply Feedback | Voltage Monitor Circuit |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback or forward converters via optocoupler-coupled feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise, temperature-stable reference for secondary-side error amplification. Use Value: Enables ±2% output regulation over line, load, and temperature-replacing less stable Zener diodes and reducing BOM count. |
Use Scenario: Detecting undervoltage or overvoltage conditions in microcontroller supply rails or battery systems. IC Role / Device Role / Timing Role: Precision reference node for comparator-based threshold detection with programmable trip points. Use Value: Achieves repeatable 2.5–20 V thresholds with <±30 mV drift-eliminating need for trimming or calibration. |
| Overvoltage Protection Clamp | Series Regulator Reference |
Use Scenario: Clamping surge events on 12 V or 24 V automotive or industrial bus lines before downstream circuitry. IC Role / Device Role / Timing Role: Fast-responding shunt element that activates above programmed threshold to divert excess current. Use Value: Sustains 100 mA continuous cathode current and handles transient surges up to 150 mA absolute max-improving system robustness. |
Use Scenario: Improving regulation accuracy of three-terminal linear regulators (e.g., LM78xx) by replacing internal reference. IC Role / Device Role / Timing Role: External precision reference feeding into the adjust pin of variable-output LDOs or regulators. Use Value: Upgrades fixed-regulator accuracy from ±5% to ±2% and extends thermal stability beyond standard part limits. |
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% tolerance, 92 ppm/°C max tempco, 100 mA cathode current, SOT23-6 package with additional pins | Requires different PCB layout due to 6-pin SOT23 footprint and lacks direct GND–VREF–VZ pin mapping | Select when tighter initial tolerance is required and board redesign accommodates extra pins and larger footprint |
| KIA431AP | ±2% tolerance, 100 ppm/°C max tempco, 100 mA cathode current, TO-92 and SOT23 packages available | Higher tempco increases VREF drift to ±40 mV over temperature-less suitable for extended-range industrial use | Acceptable for cost-sensitive consumer applications where full –55°C to +125°C stability is not required |
Compared with TL431ACDBVR and KIA431AP, ZHT431F02TC offers superior temperature stability (67 ppm/°C vs. ≥92 ppm/°C) and exact SOT23 (Type DN) pin compatibility, enabling drop-in replacement in legacy Zener-based designs without layout change.
Availability
ZHT431F02TC is available at Aetrix Electronics and suitable for switch-mode power supplies, voltage monitoring systems, overvoltage protection circuits, and series regulator enhancements requiring stable component supply across automotive, industrial, and telecom applications.
Supply support for ZHT431F02TC 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 feedback control in power conversion and safety-critical monitoring applications.
FAQ
What is the minimum cathode current required for regulation in ZHT431F02TC?
The ZHT431F02TC requires a minimum cathode current (IZMIN) of 35 µA to maintain regulation at VZ = VREF. This value is guaranteed across –55°C to +125°C and allows reliable startup in low-power monitoring circuits where feedback divider currents are minimized.
Can ZHT431F02TC replace a standard Zener diode directly?
Yes-ZHT431F02TC can directly replace Zener diodes in shunt regulator configurations. Its three-terminal structure (VZ/VREF/GND) and programmable 2.5–20 V range allow identical physical placement in SOT23 footprints, while delivering superior temperature stability and tighter tolerance than most discrete Zeners.
How does the reference input current (IREF) affect resistor divider design?
IREF ranges from 0.12 µA to 1.0 µA at 25°C and contributes directly to divider current error. To limit error to <0.1%, total divider current should exceed 100× IREF (i.e., >100 µA), recommending R1+R2 ≤ 200 kΩ for a 20 V output with 2.5 V reference.
Is ZHT431F02TC qualified for automotive applications?
ZHT431F02TC is specified for –55°C to +125°C operation and meets AEC-Q200 stress test requirements per Diodes Incorporated's qualification report. Its SOT23 (Type DN) package and RoHS 3 compliance support use in engine control units, body electronics, and ADAS power subsystems.
ZHT431F02TC 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:
- Obsolete
- 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
ZHT431F02TC FAQ
1.How can I place an order for ZHT431F02TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT431F02TC 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 ZHT431F02TC reliable?
The price and inventory of ZHT431F02TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT431F02TC is usually 5 days.
3.What payment methods are accepted for ZHT431F02TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT431F02TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT431F02TC?
ZHT431F02TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT431F02TC 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 ZHT431F02TC?
For technical support, including ZHT431F02TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT431F02TC requirements.
6.How does Aetrix verify that ZHT431F02TC is sourced from the original manufacturer or authorized distributors?
All ZHT431F02TC 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 ZHT431F02TC meets industry standards.
7.What is the process for return or replacement of ZHT431F02TC?
All ZHT431F02TC units undergo pre-shipment inspection (PSI). If there is an issue with ZHT431F02TC, 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 ZHT431F02TC part is unused and in its original packaging.
Return procedure for ZHT431F02TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZHT431F02TC Tags
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