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Diodes Incorporated ZHT431FMTA
- Part No.:
- ZHT431FMTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ZHT431FMTA.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23
- Quantity:
- Payment:
- Shipping:
Inventory:45,872
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Product details
Overview
ZHT431FMTA from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 0.5% initial reference voltage tolerance, 67ppm/°C max temperature coefficient, and 50μA–100mA cathode current capability. It operates across –55°C to +125°C and delivers programmable output voltage from 2.5V to 20V using two external resistors-commonly deployed in overvoltage protection circuits and SMPS feedback loops.
For engineers reviewing the ZHT431FMTA datasheet, ZHT431FMTA pinout, ZHT431FMTA application, or ZHT431FMTA equivalent, key selection criteria include reference voltage accuracy, thermal stability over industrial temperature range, cathode current sink capability, and SOT23 (Type DN) package compatibility with high-density PCB layouts.
Technical Context
The ZHT431FMTA functions as a temperature-compensated bandgap-based shunt reference, internally regulating VREF at 2.50V ±0.5% while maintaining low dynamic impedance (≤0.75Ω) across 1mA–100mA cathode current. Its reference input current remains below 1.0μA with <0.2μA variation over temperature.
It supports programmable regulation via external resistor dividers, enabling precise voltage monitoring and error amplification in closed-loop power systems. The device exhibits stable operation with up to 1μF capacitive load and maintains <30mV total VREF deviation across –55°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF Tolerance | ±0.5% at 25°C - enables tight-set output voltage in precision feedback networks |
| Tempco (TCVREF) | Max 67ppm/°C - ensures ≤30mV total VREF drift over full –55°C to +125°C range |
| Cathode Current Range | 50μA to 100mA - supports both low-power monitoring and high-current shunt regulation |
| Dynamic Impedance (RZ) | ≤0.75Ω at 1–100mA - minimizes output voltage perturbation under transient load steps |
| Operating Temp Range | –55°C to +125°C - qualified for under-hood automotive, industrial control, and aerospace environments |
| Package | SOT23 (Type DN) - surface-mount footprint compatible with automated assembly and thermal relief design |
Pinout & Package
SOT23 (Type DN) package: 3-pin surface-mount plastic case with standard lead pitch (0.95mm), body dimensions 2.80×2.10×1.12mm, and thermal pad-compatible layout per Diodes Inc. recommended footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Internal bandgap node; connected to external resistor divider midpoint for voltage sensing |
| GND | Ground Reference | Return path for reference current and cathode current; must be low-impedance for stability |
| VZ | Cathode Output | Regulated shunt terminal; sinks current to maintain programmed voltage at VREF node |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Output Voltage | 2.5V to 20V via R1/R2 divider - eliminates need for multiple fixed-voltage zeners |
| Low Reference Input Current | Typ. 0.12μA at 25°C - reduces divider power loss and improves high-impedance sensing accuracy |
| Stable Under Capacitive Load | Validated with up to 1μF - enables direct connection to SMPS compensation networks without oscillation |
| Lead-Free & Green Compliance | Halogen-free, antimony-free, RoHS 3 compliant - meets IPC-1752A material declaration requirements |
Applications
| Overvoltage Protection Circuit | SMPS Feedback Regulator |
|---|---|
Use Scenario: Monitors DC bus voltage in 12V/24V industrial power rails to trigger crowbar or shutdown when exceeding threshold. IC Role / Device Role / Timing Role: Precision shunt reference providing stable trip point independent of supply variation. Use Value: Enables ±1% overvoltage detection accuracy across –40°C to +85°C ambient without calibration. |
Use Scenario: Sets output voltage in flyback or forward converter by comparing secondary-side sensed voltage against reference. IC Role / Device Role / Timing Role: Error amplifier reference node in optocoupler-coupled feedback loop. Use Value: Delivers 0.5% initial accuracy and <67ppm/°C drift, reducing output voltage tolerance stack-up in isolated supplies. |
| Programmable Shunt Regulator | Temperature-Compensated Comparator Threshold |
Use Scenario: Provides regulated 5.0V rail for analog sensors in battery-powered IoT nodes where LDO dropout is prohibitive. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing discrete Zener + transistor topology. Use Value: Achieves 100mA sink capability in 2.8×2.1mm footprint with <0.75Ω dynamic impedance for low ripple. |
Use Scenario: Generates stable 2.5V threshold for single-supply comparator detecting battery low-voltage condition. IC Role / Device Role / Timing Role: Temperature-stable reference input to LM393/LM339 comparator inputs. Use Value: Maintains trip point within ±15mV over –40°C to +125°C, eliminating need for external 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 |
|---|---|---|---|
| TL431CDBVR | 1% VREF tolerance, 92ppm/°C max tempco, 100mA max cathode current | Higher initial error and thermal drift; requires larger external divider for same accuracy | Lower-cost option where ±1% output tolerance is acceptable and thermal range limited to –40°C to +85°C |
| KIA431AP | 2% VREF tolerance, 100ppm/°C max tempco, 100mA max cathode current, TO-92 package | Through-hole only; no SOT23 variant; wider tolerance limits system-level calibration burden | Legacy drop-in replacement for through-hole designs requiring minimal BOM change but sacrificing accuracy and density |
Compared with TL431CDBVR and KIA431AP, ZHT431FMTA offers tighter 0.5% reference tolerance and lower 67ppm/°C tempco-critical for high-accuracy voltage monitoring in extended temperature environments-while retaining SOT23 compatibility for space-constrained PCBs.
Availability
ZHT431FMTA is available at Aetrix Electronics and suitable for overvoltage protection circuits, SMPS feedback regulators, programmable shunt regulators, and temperature-compensated comparator thresholds requiring stable component supply across automotive, industrial, and telecom applications.
Supply support for ZHT431FMTA 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 automotive markets.
ZHT431 belongs to Diodes' precision shunt regulator product line, engineered for high-accuracy voltage reference and regulation in harsh-temperature, high-stability power systems.
FAQ
What is the minimum cathode current required for regulation in ZHT431FMTA?
The ZHT431FMTA requires a minimum cathode current (IZMIN) of 35µA to maintain regulation at VREF = 2.5V, per DS32157 Rev. 12–2. This value increases slightly at higher output voltages and elevated temperatures, reaching up to 50µA across the full –55°C to +125°C range. Designers must ensure external biasing provides sufficient current under all operating conditions.
Can ZHT431FMTA replace a standard Zener diode directly?
Yes-ZHT431FMTA can replace standard Zener diodes in shunt regulation roles, but requires two external resistors to set output voltage and a ground connection. Unlike passive Zeners, it delivers superior temperature stability (67ppm/°C vs. >1000ppm/°C), tighter tolerance (0.5% vs. 5–10%), and lower dynamic impedance (<0.75Ω vs. >10Ω), making it suitable for precision applications.
Is ZHT431FMTA qualified for automotive applications?
ZHT431FMTA is rated for –55°C to +125°C operating temperature and manufactured in an IATF 16949-certified facility, meeting AEC-Q101 stress test requirements for discrete semiconductors. While not officially AEC-Q101 certified per part number, its electrical specs, packaging, and process flow align with automotive-grade reliability expectations for non-safety-critical power monitoring functions.
How does the SOT23 (Type DN) package affect thermal performance?
The SOT23 (Type DN) package has a junction-to-ambient thermal resistance (RθJA) of approximately 220°C/W under standard JEDEC 2S2P board conditions. At 100mA cathode current and 20V cathode voltage, power dissipation reaches 2W-exceeding the 330mW rating-so designers must limit VZ × IZ product or use PCB copper pour to reduce effective RθJA below 150°C/W for reliable operation.
ZHT431FMTA 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:
- ±0.5%
- 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
ZHT431FMTA FAQ
1.How can I place an order for ZHT431FMTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT431FMTA 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 ZHT431FMTA reliable?
The price and inventory of ZHT431FMTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT431FMTA is usually 5 days.
3.What payment methods are accepted for ZHT431FMTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT431FMTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT431FMTA?
ZHT431FMTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT431FMTA 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 ZHT431FMTA?
For technical support, including ZHT431FMTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT431FMTA requirements.
6.How does Aetrix verify that ZHT431FMTA is sourced from the original manufacturer or authorized distributors?
All ZHT431FMTA 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 ZHT431FMTA meets industry standards.
7.What is the process for return or replacement of ZHT431FMTA?
All ZHT431FMTA units undergo pre-shipment inspection (PSI). If there is an issue with ZHT431FMTA, 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 ZHT431FMTA part is unused and in its original packaging.
Return procedure for ZHT431FMTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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