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Diodes Incorporated ZTL431BH6TA
- Part No.:
- ZTL431BH6TA
- Manufacturer:
- Diodes Incorporated
- Category:
- Voltage Reference
- Package:
- 6-TSSOP, SC-88, SOT-363
- Datasheet:
-
ZTL431BH6TA.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT363
- Quantity:
- Payment:
- Shipping:
Inventory:4,165
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Product details
Overview
ZTL431BH6TA from Diodes Incorporated is a precision adjustable shunt regulator in SOT363 package, featuring 0.5% initial reference voltage tolerance (2.5 V), -40°C to +125°C operating temperature range, 0.2 Ω typical dynamic output impedance, and 1–100 mA cathode sink current capability. It replaces Zener diodes in feedback loops of isolated DC-DC converters and linear regulators requiring stable 2.5–20 V programmable references.
For engineers reviewing the ZTL431BH6TA datasheet, ZTL431BH6TA pinout, ZTL431BH6TA application, or ZTL431BH6TA equivalent, key selection criteria include reference accuracy over temperature, low output impedance for loop stability, cathode current handling up to 100 mA, and compatibility with optocoupler-based feedback in flyback power supplies.
Technical Context
The ZTL431BH6TA implements a bandgap-referenced error amplifier with internal 2.5 V reference, enabling precise voltage regulation via external resistor divider. Its high open-loop gain (>60 dB at 1 kHz) and low thermal drift (≤34 mV deviation over –40°C to +125°C) support stable closed-loop operation in isolated power supply feedback paths.
It operates as a three-terminal shunt regulator: cathode sinks current when reference pin voltage exceeds 2.5 V, modulating conduction to maintain set output voltage. The device exhibits stable behavior with ≥4.7 nF anode-to-cathode capacitance and supports programmable output from VREF to 20 V with minimal load regulation error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V ±0.5% at +25°C - ensures tight initial setpoint for feedback networks without trimming |
| Temp Range | –40°C to +125°C - enables use in automotive under-hood and industrial ambient environments |
| Dynamic Impedance | 0.2 Ω typical - minimizes output voltage perturbation under fast load transients |
| Cathode Current | 1–100 mA - supports direct drive of optocoupler LEDs and higher-power shunt applications |
| Voltage Range | 2.5 V to 20 V adjustable - allows flexible output programming with two external resistors |
| Output Stability | Stable with ≥4.7 nF anode–cathode capacitor - simplifies compensation in isolated SMPS designs |
Pinout & Package
SOT363 (SC70-6) package: 6-pin surface-mount, thermally enhanced, lead-free, halogen-free. Substrate internally connected to pin 4 (NC); must be left floating or tied to anode (pin 5).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Anode | Anode terminal | Common return path; connects to system ground or low-side reference point |
| Pin 2: Cathode | Cathode terminal | Sinks regulated current; connects to feedback node of power stage (e.g., optocoupler LED anode) |
| Pin 3: Reference | Reference input | High-impedance sense node; connected to resistor divider midpoint for voltage setting |
| Pin 4: NC† | No-connect (substrate tie) | Internally bonded to substrate; leave floating or connect to pin 5 per layout guidance |
| Pin 5: Anode | Redundant anode | Electrically identical to pin 1; used for thermal relief and PCB routing flexibility |
| Pin 6: NC | No-connect | Not internally connected; must remain unconnected |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% reference tolerance (B grade) | Enables <±1% output voltage accuracy in well-designed feedback networks without calibration |
| –40°C to +125°C operation | Supports deployment in extended-temperature industrial and automotive power modules |
| 0.2 Ω dynamic output impedance | Reduces sensitivity to cathode current ripple, improving transient response in SMPS feedback loops |
| 1–100 mA sink capability | Drives standard PC817/PC817x optocouplers directly while maintaining regulation margin |
| Stable with ≥4.7 nF CAK | Eliminates need for complex RC compensation; compatible with common ceramic decoupling practices |
Applications
| Isolated Flyback Converter Feedback | Programmable Linear Regulator Reference |
|---|---|
|
Use Scenario: Secondary-side voltage sensing in AC/DC adapters and telecom power supplies using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Shunt regulator providing precise 2.5 V reference to control optocoupler LED current, thereby regulating primary-side PWM duty cycle. Use Value: Enables ±1.5% output voltage regulation across line/load/temperature with no secondary-side LDO required. |
Use Scenario: Adjustable reference for LM317/LM338-based linear regulators where fixed references lack required accuracy. IC Role / Device Role / Timing Role: Precision voltage reference replacing Zener diodes in resistor-divider networks to set output voltage. Use Value: Delivers 0.5% reference stability vs. typical 5% Zener tolerance, reducing output drift by >80% over temperature. |
| Overvoltage Protection Circuit | Temperature-Compensated Comparator Threshold |
|
Use Scenario: Monitoring 12 V or 24 V rail in industrial PLC I/O modules to trigger shutdown on overvoltage events. IC Role / Device Role / Timing Role: Adjustable shunt element that triggers crowbar or latch-off circuit when sensed voltage exceeds threshold. Use Value: Provides sharp turn-on at precisely set voltage (e.g., 13.2 V) with <100 µA off-state leakage, minimizing standby loss. |
Use Scenario: Setting trip point for battery thermal cutoff or motor winding overtemperature detection circuits. IC Role / Device Role / Timing Role: Stable reference input for comparator comparing against thermistor-derived voltage. Use Value: Maintains threshold accuracy within ±34 mV over –40°C to +125°C, eliminating need for external compensation components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBVR (TI) | Same 0.5% tolerance and 2.5 V reference, but rated only to +105°C; SOT23-5 package with different pinout | Limited to commercial/industrial ambient; not qualified for full automotive temp range | Select if cost-sensitive and operating ambient stays ≤+105°C; verify PCB footprint compatibility |
| AS431BMTR-E1 (Diodes Inc.) | Identical electrical specs and SOT363 package; same 0.5% tolerance and –40°C to +125°C rating | Pin-compatible second-source part; identical marking (31B) and reel packaging | Preferred for dual-sourcing; shares same qualification, test flow, and supply chain as ZTL431BH6TA |
Compared with TL431BIDBVR, ZTL431BH6TA offers extended temperature capability and native SOT363 layout compatibility; versus AS431BMTR-E1, it provides identical performance with guaranteed traceability to Diodes' ZTL-series production lot controls and automotive-grade process variants.
Availability
ZTL431BH6TA is available at Aetrix Electronics and suitable for isolated power supply feedback, programmable reference design, and overvoltage protection circuits requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.
Supply support for ZTL431BH6TA 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, automotive, and computing markets.
ZTL431 is part of Diodes' precision reference product line, engineered for high-accuracy, wide-temperature shunt regulation in safety-critical and high-volume power conversion systems.
FAQ
What is the maximum cathode-to-anode voltage for ZTL431BH6TA?
The absolute maximum cathode voltage (VK A) is 20 V relative to the anode. Operation beyond this risks permanent damage. Recommended operating range is VREF to 20 V, with derating above 125°C junction temperature per the datasheet's thermal resistance curve for SOT363 (θJA = 380°C/W).
Can ZTL431BH6TA replace a standard Zener diode directly?
Yes - it functions as a 2.5 V Zener replacement with superior performance: 0.5% tolerance vs. typical 5–10%, 0.2 Ω dynamic impedance vs. 10–100 Ω, and stable regulation from 1 mA to 100 mA. External resistors set output voltage; no change to basic Zener topology is needed.
Why does the SOT363 package have two anode pins (1 and 5)?
Pins 1 and 5 are electrically identical anode terminals, provided for improved thermal dissipation and PCB routing flexibility. Both must connect to the same net (typically system ground). Pin 4 is internally tied to the substrate and should be left floating or connected to pin 5 per Diodes' layout guidelines.
Is ZTL431BH6TA suitable for automotive applications?
The standard ZTL431BH6TA is qualified for –40°C to +125°C operation and meets RoHS/Green requirements, but is not AEC-Q200 qualified. For automotive use, Diodes offers the pin-compatible ZTL431BQH6TA variant, which undergoes additional stress testing and PPAP documentation.
ZTL431BH6TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Package/Case:
- 6-TSSOP, SC-88, SOT-363
- 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:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 600 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-363
ZTL431BH6TA FAQ
1.How can I place an order for ZTL431BH6TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTL431BH6TA 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 ZTL431BH6TA reliable?
The price and inventory of ZTL431BH6TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTL431BH6TA is usually 5 days.
3.What payment methods are accepted for ZTL431BH6TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTL431BH6TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTL431BH6TA?
ZTL431BH6TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTL431BH6TA 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 ZTL431BH6TA?
For technical support, including ZTL431BH6TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTL431BH6TA requirements.
6.How does Aetrix verify that ZTL431BH6TA is sourced from the original manufacturer or authorized distributors?
All ZTL431BH6TA 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 ZTL431BH6TA meets industry standards.
7.What is the process for return or replacement of ZTL431BH6TA?
All ZTL431BH6TA units undergo pre-shipment inspection (PSI). If there is an issue with ZTL431BH6TA, 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 ZTL431BH6TA part is unused and in its original packaging.
Return procedure for ZTL431BH6TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTL431BH6TA Tags
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TL431BQDBZR
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