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Diodes Incorporated ZHT2431F02TA
- Part No.:
- ZHT2431F02TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHT2431F02TA.pdf
- Description:
- IC VREF SHUNT ADJ 2.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:1,099
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Product details
Overview
ZHT2431F02TA from Zetex Semiconductors (now Diodes Incorporated) is a three-terminal adjustable shunt regulator with 1.24 V nominal reference voltage, ±2.5% initial tolerance, and 50 ppm/°C average temperature coefficient. It sinks 100 µA–25 mA, operates from –55°C to +125°C, and is packaged in SOT-23. It serves as a precision voltage reference in feedback loops of isolated DC-DC converters.
For engineers reviewing the ZHT2431F02TA datasheet, ZHT2431F02TA pinout, ZHT2431F02TA application, or ZHT2431F02TA equivalent, key selection criteria include programmable output voltage (1.24–15 V), low dynamic impedance (0.25–2 Ω), temperature-stable reference, cathode current regulation threshold (30–100 µA), and SOT-23 thermal dissipation (330 mW at 25°C).
Technical Context
The ZHT2431F02TA implements a bandgap-derived, temperature-compensated reference core with internal curvature correction, enabling stable 1.24 V output across –55°C to +125°C. Its two-resistor external programming interface allows precise output setting without trimming, and its low 0.11 µA typical reference input current minimizes divider loading error.
Dynamic output impedance remains below 2 Ω up to 100 kHz, supporting fast transient response in SMPS feedback paths. The device requires ≥100 pF cathode-to-anode capacitance for stable operation below 0.2 mA cathode current, and exhibits <15 mV total reference voltage deviation over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±2.5% - defines base accuracy of programmable output; sets minimum output at 1.24 V when R₂ = open. |
| Tempco | 50 ppm/°C avg - ensures ≤15 mV total drift over –55°C to +125°C, critical for industrial power supply stability. |
| Cathode Current Range | 100 µA to 25 mA - supports wide load variation while maintaining regulation; min 100 µA avoids dropout in low-power feedback paths. |
| Dynamic Impedance | 0.25–2 Ω - enables tight loop control in SMPS; value scales with resistor ratio in programmed configurations. |
| Ref Input Current | 0.02–0.4 µA - permits use of high-value resistors (e.g., 1 MΩ) without significant divider error or power loss. |
| Operating Temp Range | –55°C to +125°C - validated for under-hood automotive and industrial environments without derating. |
| Max Cathode Voltage | 15 V - limits safe operating area; defines upper bound of programmable output range. |
Pinout & Package
SOT-23 package (suffix F), surface-mount, 3-pin, JEDEC MO-178 compliant. Thermal resistance θJA = 375°C/W; max power dissipation = 330 mW at TA = 25°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Output node / voltage sense point | Connected to SMPS transformer secondary or output rail; voltage at this pin determines regulation setpoint via external divider. |
| Anode (Pin 2) | Ground reference / return path | Low-impedance return for reference current and cathode sink current; must be tied to system ground with minimal trace inductance. |
| Reference (Pin 3) | Internal bandgap node / feedback input | Internally biased at 1.24 V; externally connected to divider junction; governs regulation by comparing divided output to this fixed reference. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 1.24–15 V via two external resistors - eliminates need for multiple fixed-voltage zeners and simplifies BOM across output variants. |
| Temperature-compensated reference | 50 ppm/°C avg tempco - maintains ±0.5% output accuracy over full –55°C to +125°C range without external compensation. |
| Low reference input current | 0.11 µA typical - reduces power loss in high-resistance feedback dividers and improves noise immunity. |
| Stable operation with ≥100 pF CA capacitance | Enables direct integration with standard output filter caps - avoids need for dedicated compensation networks in most SMPS designs. |
| High cathode current capability | 25 mA sink capacity - supports regulation in higher-output-power converters without external transistor assist. |
Applications
| Switch Mode Power Supply Feedback | Voltage Monitor Circuit |
|---|---|
Use Scenario: Regulating isolated 3.3 V output in flyback converter with optocoupler feedback. IC Role / Device Role / Timing Role: Precision shunt reference providing 1.24 V feedback threshold; interfaces with optocoupler LED to close primary-side control loop. Use Value: Enables accurate 3.3 V output with <±1% total error over line, load, and temperature - surpassing standard zener performance. | Use Scenario: Detecting undervoltage condition on 12 V battery rail in automotive ECU. IC Role / Device Role / Timing Role: Adjustable threshold generator; R₁/R₂ network sets trip point at 10.8 V (90% of nominal). Use Value: Delivers stable trip point across –40°C to +105°C without calibration, replacing discrete comparator + zener solution. |
| Overvoltage Protection | Series Regulator Reference |
Use Scenario: Clamping 5 V rail during load dump transients in industrial PLC I/O module. IC Role / Device Role / Timing Role: Shunt element activated when rail exceeds 5.5 V; sinks excess current to protect downstream logic. Use Value: Fast response (<500 ns pulse rise time) and low dynamic impedance limit overshoot to <150 mV peak. | Use Scenario: Setting output of LM317-based 12 V linear regulator in test equipment. IC Role / Device Role / Timing Role: Replaces internal 1.25 V reference with higher-accuracy, lower-tempco 1.24 V source. Use Value: Improves output stability to ±0.2% over temperature vs. ±1.5% with native LM317 reference. |
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 reference, ±1% tolerance, 92 ppm/°C tempco, 100 mA sink capability | Higher reference voltage limits low-output designs; higher tempco increases drift in wide-temp apps | Prefer when >2.5 V output required and tighter initial tolerance outweighs temp stability needs |
| AS431ASTU | 1.24 V reference, ±1% tolerance, 50 ppm/°C tempco, 100 mA sink, SOT-23-3 | Same reference voltage and tempco, but higher current rating and tighter initial tolerance | Choose for higher-current SMPS or where ±1% initial accuracy is mandatory |
Compared with TL431ACDBVR, ZHT2431F02TA offers superior temperature stability for low-voltage outputs and lower quiescent current; compared with AS431ASTU, it trades ±1% tolerance for broader availability and proven long-term reliability in legacy industrial designs.
Availability
ZHT2431F02TA is available at Aetrix Electronics and suitable for switch mode power supplies, battery monitoring systems, and overvoltage protection circuits requiring stable component supply across extended temperature ranges.
Supply support for ZHT2431F02TA 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
Zetex Semiconductors, acquired by Diodes Incorporated in 2008, specialized in high-performance analog and discrete semiconductors for industrial, automotive, and power management applications.
The ZHT2431 series belongs to Zetex's precision voltage reference product line, designed specifically for high-stability, wide-temperature shunt regulation in mission-critical power conversion and protection circuits.
FAQ
What is the minimum cathode current required for regulation?
The ZHT2431F02TA requires a minimum cathode current of 30 µA to 100 µA for stable regulation, depending on operating temperature and cathode voltage. Below 100 pF cathode-to-anode capacitance, the minimum rises to 0.2 mA per the datasheet stability boundary condition.
Can ZHT2431F02TA replace a standard zener diode directly?
Yes - it functions as a 3-terminal drop-in replacement for 1.24–15 V zeners in shunt regulator configurations. Unlike passive zeners, it requires connection of the reference pin to the resistor divider junction, not ground, and delivers significantly better temperature stability and tighter tolerance.
How does the dynamic output impedance change with external resistor values?
Dynamic impedance scales with the external resistor ratio: R′ = RZ × (1 + R₁/R₂). For example, with R₁ = 10 kΩ and R₂ = 1.2 kΩ (setting ~12 V output), effective impedance rises to ~2.2 Ω - critical for loop stability analysis in SMPS designs.
Is ZHT2431F02TA qualified for automotive applications?
While not AEC-Q100 qualified, the ZHT2431F02TA is rated for –55°C to +125°C operation and has been widely deployed in automotive under-hood modules such as body control units and lighting drivers where extended temperature performance is required but formal qualification is not mandated.
ZHT2431F02TA 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):
- 1.24V
- Voltage - Output (Max):
- 15 V
- Current - Output:
- 25 mA
- Tolerance:
- ±2.5%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
ZHT2431F02TA FAQ
1.How can I place an order for ZHT2431F02TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT2431F02TA 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 ZHT2431F02TA reliable?
The price and inventory of ZHT2431F02TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT2431F02TA is usually 5 days.
3.What payment methods are accepted for ZHT2431F02TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT2431F02TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT2431F02TA?
ZHT2431F02TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT2431F02TA 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 ZHT2431F02TA?
For technical support, including ZHT2431F02TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT2431F02TA requirements.
6.How does Aetrix verify that ZHT2431F02TA is sourced from the original manufacturer or authorized distributors?
All ZHT2431F02TA 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 ZHT2431F02TA meets industry standards.
7.What is the process for return or replacement of ZHT2431F02TA?
All ZHT2431F02TA units undergo pre-shipment inspection (PSI). If there is an issue with ZHT2431F02TA, 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 ZHT2431F02TA part is unused and in its original packaging.
Return procedure for ZHT2431F02TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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