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Texas Instruments TLVH431CDBZTG4
- Part No.:
- TLVH431CDBZTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431CDBZTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,608
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Product details
Overview
TLVH431CDBZTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, providing 1.24 V reference voltage with ±1.5% initial tolerance at 25°C, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431CDBZTG4 datasheet, TLVH431CDBZTG4 pinout, TLVH431CDBZTG4 application, or TLVH431CDBZTG4 equivalent, key selection criteria include reference accuracy over temperature, minimum cathode current for regulation (100 μA), dynamic impedance (0.25 Ω), and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLVH431CDBZTG4 implements a bandgap-referenced error amplifier driving a Darlington output stage, enabling precise shunt regulation down to 1.24 V with sharp turn-on characteristics. Its internal architecture supports both open-loop comparator mode and closed-loop shunt regulation via external resistor feedback between cathode and reference pins.
Unlike the TL431, it operates at lower headroom (≥1.24 V) and lower minimum cathode current (100 μA vs. 1 mA), making it suitable for low-power and wide-input-range isolated supplies. It is internally compensated and stable without output capacitance, though phase margin varies with capacitive load and cathode voltage per Figures 5-15–5-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1.5% at 25°C - sets minimum adjustable output voltage and defines feedback threshold in regulator circuits. |
| Cathode Current Range | 100 μA to 70 mA - determines minimum bias requirement for regulation and maximum shunt power handling (≤0.84 W at 12 V). |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback networks. |
| Operating Temperature | –40°C to +125°C - supports automotive and industrial applications requiring extended thermal robustness. |
| Reference Input Current | 0.1–0.5 μA - enables high-impedance feedback dividers without significant loading error. |
| Output Voltage Range | VREF to 18 V - achieved via two external resistors, allowing flexible adjustment for 3.3 V, 5 V, 12 V, and other rails. |
| Thermal Stability (ΔVREF) | ±12 mV over full temperature range (TLVH431C grade) - corresponds to ~100 ppm/°C average TC, critical for precision references. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, lead-free, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Accepts regulated current from supply rail; voltage at this pin is set by external feedback network; must be ≥VREF for regulation. |
| ANODE (Pin 2) | Common return / ground reference | Typically connected to system ground or negative rail; serves as current sink return path and reference potential for internal amplifier. |
| REF (Pin 3) | Feedback input / reference sense | Compares external voltage divider ratio against internal 1.24 V reference; requires ≥0.1 μA input current for proper biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where traditional 2.5 V references fail. |
| Sharp turn-on characteristic | High open-loop gain with Darlington output - provides fast comparator response and clean shunt switching in error amplification. |
| No external compensation required | Internally compensated - eliminates need for output capacitor in most configurations, simplifying layout and reducing BOM count. |
| Ultra-low reference input current | 0.1–0.5 μA - permits use of high-value feedback resistors (>1 MΩ), minimizing quiescent current in battery-powered designs. |
| Zener diode replacement capability | Sub-100 μA leakage (IK(off) ≤ 0.1 μA) - improves efficiency and accuracy over standard Zeners in voltage monitoring and clamping. |
Applications
| Secondary-Side Regulation in Flyback SMPS | Adjustable Voltage Reference for Data Converters |
|---|---|
Use Scenario: Used with optocoupler in isolated 3.3 V flyback converter to regulate output voltage on secondary side. IC Role / Device Role / Timing Role: Error amplifier and precision reference - compares sampled output voltage against 1.24 V internal reference and drives optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + optocoupler VF), supporting modern low-voltage rails with <±1% accuracy over temperature. |
Use Scenario: Provides stable, adjustable reference voltage for SAR ADCs and DACs in instrumentation systems. IC Role / Device Role / Timing Role: Precision shunt reference - sets full-scale input range via resistor divider; replaces discrete Zener + op-amp solutions. Use Value: Delivers 0.25 Ω dynamic impedance and <12 mV VREF drift over –40°C to +125°C, ensuring consistent converter linearity and offset stability. |
| Low-Leakage Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Monitors 5 V or 12 V power rails for undervoltage lockout (UVLO) in embedded controllers. IC Role / Device Role / Timing Role: Threshold detector - configured as comparator with REF pin tied to divided rail voltage and cathode pulled up to monitored rail. Use Value: Achieves <0.1 μA off-state cathode current (IK(off)), minimizing standby power loss while maintaining accurate trip point across temperature. |
Use Scenario: Replaces dual-component comparator + external reference in space-constrained IoT sensor nodes. IC Role / Device Role / Timing Role: Single-chip comparator - uses internal 1.24 V reference and high-gain Darlington output for digital-level decision making. Use Value: Reduces component count by one device and eliminates matching errors between reference and comparator, improving trip-point repeatability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt-regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IDBZT | Same SOT-23-3 package, but I-grade (–40°C to +85°C) with ±1% initial tolerance and tighter VREF drift (±6 mV). | Better thermal stability for commercial/industrial ambient environments; not qualified for extended automotive temp range. | Select when higher accuracy and wider temperature coverage than C-grade are needed, but full Q-grade range is unnecessary. |
| TLVH431BDBZT | Same package, B-grade (±0.5% initial tolerance at 25°C), same temperature range as TLVH431CDBZTG4. | Higher initial accuracy benefits precision feedback loops where calibration is impractical; identical thermal performance. | Choose when absolute reference accuracy dominates cost sensitivity, especially in metrology or high-end power supplies. |
Compared with TLVH431IDBZT and TLVH431BDBZT, the TLVH431CDBZTG4 offers the broadest operating temperature range (–40°C to +125°C) among C/I/B variants while maintaining lowest cost, making it optimal for automotive under-hood and industrial control applications where extreme thermal resilience is mandatory but sub-1% initial accuracy is acceptable.
Availability
TLVH431CDBZTG4 is available at Aetrix Electronics and suitable for secondary-side regulation in flyback SMPSs, precision voltage monitoring in automotive ECUs, and adjustable reference generation in data acquisition systems requiring stable component supply and long-term lifecycle continuity.
Supply support for TLVH431CDBZTG4 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
Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management ICs, with leadership in precision reference and power conversion technologies.
The TLVH431 family was designed to replace Zener diodes and legacy TL431-based references in low-voltage, high-accuracy shunt regulation applications-particularly in isolated power supplies, voltage supervision, and sensor signal conditioning.
FAQ
What is the reference voltage tolerance of TLVH431CDBZTG4 at 25°C?
The TLVH431CDBZTG4 has a reference voltage tolerance of ±1.5% at 25°C, corresponding to a nominal 1.24 V output ranging from 1.222 V to 1.258 V. This tolerance is specified for the "C" grade variant and applies only at room temperature; full-range deviation is ±12 mV over –40°C to +125°C.
Can TLVH431CDBZTG4 operate with cathode voltage below 1.24 V?
No, TLVH431CDBZTG4 requires cathode voltage (VK) ≥ 1.24 V to enter regulation mode. Below this threshold, the internal amplifier cannot bias properly, and the device behaves as an open circuit with IK(off) ≤ 0.1 μA. It is not functional as a sub-1.24 V reference or clamp.
What is the minimum cathode current required for regulation in TLVH431CDBZTG4?
The TLVH431CDBZTG4 requires a minimum cathode current (IK(min)) of 100 μA to maintain regulation, as specified in Section 5.5 of the datasheet. Operation below this level results in degraded gain, increased output impedance, and potential loss of regulation accuracy.
Is TLVH431CDBZTG4 pin-compatible with TL431 or TLV431?
No, TLVH431CDBZTG4 is not pin-compatible with TL431 (which uses TO-92 or SOIC-8 packages) or TLV431 (SOT-23-3 but with different pinout: REF–CATHODE–ANODE). TLVH431CDBZTG4 uses CATHODE–ANODE–REF pin order, requiring PCB layout revision when substituting.
Does TLVH431CDBZTG4 require an output capacitor for stability?
No, TLVH431CDBZTG4 is internally compensated and stable without an output capacitor between cathode and anode. However, if a capacitor is used, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance versus capacitive load and cathode voltage to avoid oscillation.
TLVH431CDBZTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431CDBZTG4 FAQ
1.How can I place an order for TLVH431CDBZTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431CDBZTG4 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 TLVH431CDBZTG4 reliable?
The price and inventory of TLVH431CDBZTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431CDBZTG4 is usually 5 days.
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TLVH431CDBZTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431CDBZTG4 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 TLVH431CDBZTG4?
For technical support, including TLVH431CDBZTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431CDBZTG4 requirements.
6.How does Aetrix verify that TLVH431CDBZTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431CDBZTG4 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 TLVH431CDBZTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431CDBZTG4?
All TLVH431CDBZTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431CDBZTG4, 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 TLVH431CDBZTG4 part is unused and in its original packaging.
Return procedure for TLVH431CDBZTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431CDBZTG4 Tags
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TL431BQDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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