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Diodes Incorporated ZHT431C02L
- Part No.:
- ZHT431C02L
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
ZHT431C02L.pdf
- Description:
- IC VREF SHUNT ADJ 2% TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,869
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Product details
Overview
ZHT431C02L from Diodes Incorporated is a three-terminal adjustable precision shunt regulator with 2% initial tolerance, programmable output voltage (2.5–20 V), ±67 ppm/°C max temperature coefficient, and 100 mA cathode current capability in TO-92 package. It replaces discrete Zener diodes in voltage monitoring and over/under-voltage protection circuits operating from –55°C to +125°C.
For engineers reviewing the ZHT431C02L datasheet, ZHT431C02L pinout, ZHT431C02L application, or ZHT431C02L equivalent, key selection criteria include reference voltage deviation over temperature (≤30 mV), dynamic output impedance (0.75 Ω), minimum regulation current (50 mA), and TO-92 thermal derating behavior at elevated ambient temperatures.
Technical Context
The ZHT431C02L functions as a two-input, one-output shunt regulator: its reference input (VREF) senses a divided fraction of cathode voltage (VZ), while the cathode (VZ) sinks current to maintain regulation. Internal bandgap-derived reference ensures stable 2.50 V nominal VREF across –55°C to +125°C.
It operates in closed-loop mode when configured with external resistors R1 and R2, where output voltage is set by VZ = VREF × (1 + R1/R2). Its low 0.75 Ω dynamic output impedance and <100 µA reference input current enable high-accuracy, low-noise feedback in SMPS and comparator threshold circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.50 V ±2% - sets base reference for programmable output; determines accuracy floor of regulated voltage |
| VDEV | ≤30 mV over –55°C to +125°C - limits total reference drift in wide-temperature industrial designs |
| TCVREF | ≤67 ppm/°C - enables stable voltage thresholds in automotive under-hood or outdoor power systems |
| IZmax | 100 mA - supports direct shunt regulation of moderate-power rails without external pass devices |
| RZ | 0.75 Ω - provides tight load regulation and fast transient response in feedback loops |
| IZmin | 50 mA - defines minimum cathode current needed to sustain regulation; impacts resistor sizing in divider network |
| IREF | 0.12–1.0 mA - low reference current minimizes divider power loss and improves efficiency in battery-powered monitors |
Pinout & Package
Package: TO-92 - through-hole plastic package with 4.32–4.95 mm body length, 3.30–3.94 mm width, and 12.70–15.49 mm lead-to-lead length; rated for 4000 pcs/loose pack; obsolete status per Diodes Inc. ordering table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (VZ) | Current sink node | Connected to positive rail; sinks up to 100 mA to maintain programmed VZ; requires heatsinking above ~50 mA at high ambient |
| Anode (GND) | Reference return path | Common ground for internal reference and external resistor divider; must be low-impedance to avoid regulation error |
| Reference (VREF) | Feedback sense input | Connects to midpoint of R1–R2 divider; draws ≤1 mA; high-impedance node sensitive to PCB leakage and noise |
Key Features
| Feature | Design Value |
|---|---|
| Programmable output voltage | 2.5–20 V via external R1/R2 - eliminates need for multiple fixed-Zener SKUs in BOM |
| Temperature-compensated reference | Bandgap-derived VREF with ≤67 ppm/°C TC - maintains accuracy without external compensation networks |
| Low output noise | Sub-mV RMS noise - suitable for precision voltage monitoring and analog comparator thresholds |
| Wide operating temperature range | –55°C to +125°C - qualified for industrial control, telecom power, and automotive non-safety-critical subsystems |
| Green molding compound | Halogen-free, RoHS-compliant packaging - meets environmental compliance requirements for global OEM shipments |
Applications
| Series Regulator | Shunt Regulator |
|---|---|
Use Scenario: Stabilizing unregulated DC input (e.g., rectified AC or battery) to deliver clean 5 V or 12 V to analog sensors. IC Role / Device Role / Timing Role: Shunt element controlling base drive of series pass transistor; sets reference for error amplifier. Use Value: Enables low-cost, discrete-series regulator with better line/load regulation than Zener-only solutions. | Use Scenario: Providing precise 3.3 V bias to ADC reference inputs in data acquisition modules. IC Role / Device Role / Timing Role: Direct shunt regulator sinking excess current to hold VOUT constant. Use Value: Delivers 2% initial accuracy and <30 mV temp drift-critical for 12-bit+ measurement fidelity. |
| Voltage Monitor | Over/Under-Voltage Protection |
Use Scenario: Detecting brown-out conditions on a 24 V industrial PLC I/O supply. IC Role / Device Role / Timing Role: Precision threshold generator feeding comparator input; VREF used directly as trip point. Use Value: Achieves ±2% trip accuracy over full temperature range-reduces false triggers in harsh environments. | Use Scenario: Safeguarding FPGA core voltage against supply faults in telecom line cards. IC Role / Device Role / Timing Role: Dual-threshold reference source (via R1A/R2A and R1B/R2B dividers) enabling window detection. Use Value: Single-device solution for ±2% high/low limits eliminates dual-Zener mismatch and layout complexity. |
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 | 0.5% initial tolerance, SO-8 package, 36 V max VZ, 100 mA IZmax | SMT-only; higher voltage rating; tighter tolerance but larger footprint | Preferred for new SMT designs requiring <1% accuracy and >20 V operation |
| KA431AZTA | 2% tolerance, TO-92, 36 V max VZ, 100 mA IZmax, no specified TCVREF | Same package and tolerance; lacks published tempco spec; lower cost | Acceptable for cost-sensitive, non-temperature-critical shunt uses where 67 ppm/°C is not required |
Compared with TL431ACDBVR and KA431AZTA, ZHT431C02L offers verified 67 ppm/°C tempco and guaranteed 30 mV VREF drift over temperature-making it preferable for industrial monitoring where long-term stability matters more than absolute initial accuracy or maximum voltage rating.
Availability
ZHT431C02L is available at Aetrix Electronics and suitable for industrial power supervision, telecom voltage monitoring, and embedded system brown-out detection requiring stable component supply despite its obsolete status per Diodes Incorporated's ordering table.
Supply support for ZHT431C02L 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, headquartered in Plano, Texas, with design and manufacturing operations across Asia and the Americas.
The ZHT431 belongs to Diodes' precision shunt regulator product line, designed specifically for high-stability voltage reference and regulation in industrial, telecom, and automotive power systems where extended temperature operation and low drift are critical.
FAQ
What is the minimum cathode current required for regulation in ZHT431C02L?
The ZHT431C02L requires a minimum cathode current (IZmin) of 50 mA to maintain regulation at VZ = VREF, as specified in the Electrical Characteristics table. This value is measured at Tamb = 25°C and defines the lower bound of the usable current range; operation below this level risks loss of regulation accuracy or dropout.
Can ZHT431C02L be used in place of a standard Zener diode?
Yes-ZHT431C02L replaces standard Zener diodes in applications needing improved temperature stability, tighter initial tolerance (2%), and programmable output. Unlike passive Zeners, it requires an external resistor divider and draws reference current (0.12–1.0 mA), so circuit redesign is necessary for direct substitution.
What is the maximum cathode voltage rating for ZHT431C02L?
The absolute maximum cathode voltage (VZ) for ZHT431C02L is 20 V, as stated in the Absolute Maximum Ratings table. Exceeding this voltage risks permanent device damage, regardless of current level. For applications requiring >20 V, alternatives like TL431 (36 V) should be considered.
Is ZHT431C02L RoHS-compliant and halogen-free?
Yes-ZHT431C02L uses Diodes Incorporated's "Green" molding compound, explicitly defined as halogen-free (no Br or Sb) and compliant with RoHS Directive 2011/65/EU, as confirmed in the Features section of the datasheet.
ZHT431C02L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- TO-92
ZHT431C02L FAQ
1.How can I place an order for ZHT431C02L through Aetrix?
Please submit a Request for Quotation (RFQ) for ZHT431C02L 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 ZHT431C02L reliable?
The price and inventory of ZHT431C02L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZHT431C02L is usually 5 days.
3.What payment methods are accepted for ZHT431C02L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZHT431C02L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZHT431C02L?
ZHT431C02L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZHT431C02L 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 ZHT431C02L?
For technical support, including ZHT431C02L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZHT431C02L requirements.
6.How does Aetrix verify that ZHT431C02L is sourced from the original manufacturer or authorized distributors?
All ZHT431C02L 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 ZHT431C02L meets industry standards.
7.What is the process for return or replacement of ZHT431C02L?
All ZHT431C02L units undergo pre-shipment inspection (PSI). If there is an issue with ZHT431C02L, 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 ZHT431C02L part is unused and in its original packaging.
Return procedure for ZHT431C02L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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