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Diodes Incorporated ZHT431C01STOB
- Part No.:
- ZHT431C01STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
ZHT431C01STOB.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,996
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Product details
Overview
ZHT431C01STOB from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 1% initial tolerance, 2.5 V reference voltage, and programmable output voltage range of 2.5–20 V via external resistors. It delivers up to 100 mA cathode current, operates from –55°C to +125°C, and exhibits 67 ppm/°C max temperature coefficient-enabling stable voltage monitoring and overvoltage protection in industrial power supplies.
For engineers reviewing the ZHT431C01STOB datasheet, ZHT431C01STOB pinout, ZHT431C01STOB application, or ZHT431C01STOB equivalent, key selection criteria include its TO-92 package, 1% VREF tolerance, low dynamic impedance (0.75 Ω), wide temperature range, and compatibility with shunt-based feedback loops in isolated DC-DC converters and battery protection circuits.
Technical Context
The ZHT431C01STOB functions as a precision two-terminal shunt reference with internal bandgap-derived 2.5 V reference and high-gain error amplifier. Its regulation relies on external resistor divider feedback between cathode (VZ) and reference (VREF) terminals, enabling programmable setpoints without internal trimming.
It maintains regulation down to 50 µA minimum cathode current and supports stable operation with load capacitance up to 1 µF. The device's low 0.75 Ω dynamic output impedance and <30 mV total VREF deviation over temperature ensure tight output voltage control under varying line and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.50 V ±1% - precise internal reference sets base regulation point for external resistor programming |
| VZ Range | 2.5–20 V - programmable output via R1/R2 divider, supporting common supply rails and custom thresholds |
| IZ Max | 100 mA - enables direct shunt regulation in medium-current applications without external pass transistor |
| Temp Coeff | ≤67 ppm/°C - ensures ≤±15 mV drift over –55°C to +125°C, critical for automotive and industrial environments |
| Dynamic RZ | 0.75 Ω - minimizes output voltage variation under fast load transients in feedback control loops |
| IZmin | 50 µA - allows regulation at ultra-low quiescent current, suitable for battery-backed monitoring circuits |
| Operating Temp | –55°C to +125°C - validated performance across extended industrial and under-hood automotive temperature ranges |
Pinout & Package
Package: TO-92 (3-lead plastic through-hole). Dimensions per Diodes Inc. Issue 7 datasheet: body height 12.7–15.49 mm, lead pitch 2.54 mm, standard JEDEC TO-92 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (K) | Output voltage node / current sink terminal | Connected to regulated voltage rail; sinks up to 100 mA; voltage programmed relative to VREF |
| Anode (A) | Ground reference / return path | Common return for cathode current and reference input; must be low-impedance ground connection |
| Reference (R) | Feedback input / precision reference sense | Internally biased at 2.5 V; connected to resistor divider midpoint to set VZ = VREF × (1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output via 2-resistor network | Enables exact voltage setpoint tuning without custom-trimmed parts; eliminates inventory of multiple fixed-voltage zeners |
| 67 ppm/°C max tempco | Reduces thermal drift-induced trip-point error in overvoltage protection circuits across wide ambient ranges |
| 0.75 Ω dynamic impedance | Maintains <10 mV output deviation during 50 mA load steps-critical for stable feedback in SMPS error amplifiers |
| –55°C to +125°C operation | Validated performance in harsh environments including motor control enclosures and outdoor telecom power systems |
| 1% initial VREF tolerance | Reduces need for post-assembly calibration in factory-set voltage monitors and battery cutoff circuits |
Applications
| Switch Mode Power Supply Feedback | Overvoltage Protection Circuit |
|---|---|
Use Scenario: Primary-side feedback in isolated flyback converters where optocoupler-coupled regulation requires precise, temperature-stable reference. IC Role / Device Role / Timing Role: Shunt regulator providing stable 2.5 V reference to drive optocoupler LED; sets secondary-side output voltage via resistor ratio. Use Value: Replaces discrete zener + transistor networks with single-component solution offering tighter tolerance and lower drift. |
Use Scenario: Monitoring 12 V automotive battery rail to trigger shutdown if voltage exceeds 13.8 V during alternator overcharge. IC Role / Device Role / Timing Role: Adjustable shunt reference feeding comparator input; threshold set by R1/R2 to 13.8 V. Use Value: Enables accurate, temperature-compensated trip point without trimming-reducing BOM count and test time. |
| Programmable Voltage Monitor | Three-Terminal Regulator Enhancement |
Use Scenario: Supervising FPGA core voltage (0.85 V) using external op-amp buffer and resistor scaling to match ZHT431's 2.5 V reference range. IC Role / Device Role / Timing Role: Precision reference source for comparator-based undervoltage lockout (UVLO) circuit. Use Value: Delivers ±1% threshold accuracy over temperature-superior to standard TL431 variants in high-reliability embedded systems. |
Use Scenario: Improving line/load regulation of LM7805 by injecting error correction current into its ADJ pin via ZHT431-based feedback. IC Role / Device Role / Timing Role: High-accuracy shunt reference replacing zener diode in series regulator feedback loop. Use Value: Reduces output voltage drift from ±3% to ±0.5% across temperature and input variations. |
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 (TI) | 2.5 V ±0.5% initial tolerance; SOT-23 package; 0.22 Ω typical RZ; rated to +125°C | Higher precision and smaller footprint, but TO-92 mounting and legacy board compatibility favor ZHT431C01STOB | Select when tighter VREF tolerance and surface-mount assembly are required |
| AS431ASTU (ADS) | 2.5 V ±1% tolerance; TO-92 package; 100 mA IZ max; 70 ppm/°C tempco; RoHS-compliant | Near-identical pinout and electrical specs; minor tempco difference (3 ppm/°C higher) has negligible impact below 100°C | Select for second-source availability with identical mechanical and thermal interface |
Compared with TL431ACDBVR and AS431ASTU, ZHT431C01STOB offers identical TO-92 form factor and 1% tolerance but slightly higher tempco-making it optimal for cost-sensitive through-hole designs where legacy footprint reuse is mandatory and full –55°C operation is required.
Availability
ZHT431C01STOB is available at Aetrix Electronics and suitable for industrial power supplies, automotive battery management systems, and telecom DC-DC converter feedback requiring stable component supply with long-lifecycle support.
Supply support for ZHT431C01STOB 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 industrial and automotive applications demanding extended temperature operation, low drift, and robust through-hole packaging.
FAQ
What is the minimum cathode current required for regulation in ZHT431C01STOB?
The ZHT431C01STOB requires a minimum cathode current of 50 µA to maintain regulation, as specified in the Recommended Operating Conditions table. This low threshold enables use in ultra-low-power monitoring circuits, such as battery voltage supervisors with microamp-level standby current budgets.
Can ZHT431C01STOB replace a standard 5.1 V zener diode directly?
No-ZHT431C01STOB is a three-terminal device requiring external resistors to set output voltage and cannot substitute a two-terminal zener without circuit modification. To replicate 5.1 V, connect R1 = 10.2 kΩ and R2 = 10 kΩ between cathode and reference pins, with anode grounded.
Is ZHT431C01STOB qualified for automotive applications?
Yes-its –55°C to +125°C operating temperature range, 1% VREF tolerance, and 67 ppm/°C tempco meet AEC-Q101 stress test requirements for passive components in automotive power systems, including engine control modules and body electronics.
What is the maximum power dissipation for ZHT431C01STOB in TO-92 package?
In TO-92 package at 25°C ambient, ZHT431C01STOB has a maximum power dissipation of 625 mW, derived from its 100 mA cathode current rating and 20 V absolute maximum cathode voltage. Derating is required above 25°C per the thermal resistance curve in the datasheet.
ZHT431C01STOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- 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:
- ±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:
- Through Hole
- Supplier Device Package:
- TO-92
ZHT431C01STOB FAQ
1.How can I place an order for ZHT431C01STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT431C01STOB 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 ZHT431C01STOB reliable?
The price and inventory of ZHT431C01STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT431C01STOB is usually 5 days.
3.What payment methods are accepted for ZHT431C01STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT431C01STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT431C01STOB?
ZHT431C01STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT431C01STOB 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 ZHT431C01STOB?
For technical support, including ZHT431C01STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT431C01STOB requirements.
6.How does Aetrix verify that ZHT431C01STOB is sourced from the original manufacturer or authorized distributors?
All ZHT431C01STOB 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 ZHT431C01STOB meets industry standards.
7.What is the process for return or replacement of ZHT431C01STOB?
All ZHT431C01STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZHT431C01STOB, 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 ZHT431C01STOB part is unused and in its original packaging.
Return procedure for ZHT431C01STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZHT431C01STOB Tags
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