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Texas Instruments TLVH431BCDBZRG4
- Part No.:
- TLVH431BCDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431BCDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,325
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Product details
Overview
TLVH431BCDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 1.24 V reference voltage (±0.5% at 25°C), 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH431BCDBZRG4 datasheet, TLVH431BCDBZRG4 pinout, TLVH431BCDBZRG4 application, or TLVH431BCDBZRG4 equivalent, key selection criteria include reference tolerance grade (B), thermal stability over industrial/automotive temperature ranges, dynamic impedance (0.25 Ω), cathode voltage headroom (down to 1.24 V), and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH431BCDBZRG4 implements a bandgap-referenced error amplifier with internal Darlington output stage, enabling precise shunt regulation via external resistor divider feedback between CATHODE and REF pins. Its open-loop comparator mode supports voltage monitoring without external reference.
It operates with ≥1.24 V cathode-to-anode voltage and requires ≥100 μA cathode current for stable regulation. The device is internally compensated-no output capacitor needed for stability-but phase margin varies with capacitive load and cathode voltage (1.25 V to 5 V), per Figures 5-15–5-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum regulated output; enables 1.24–18 V adjustment range with two resistors. |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and high-current shunt regulation without external boost. |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients in feedback loops. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments. |
| Output Voltage Range | 1.24 V to 18 V - adjustable via external R1/R2 divider; compatible with 3.3 V, 5 V, and 12 V SMPS rails. |
| Reference Input Current | 0.1–0.5 μA - minimizes divider current error and power loss in high-impedance sensing networks. |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage; critical for wide-input-range supplies. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body size), surface-mount, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current sink input | Primary current path; connects to supply rail or optocoupler LED anode in isolated feedback. |
| ANODE (Pin 2) | Common return node | Typically grounded; establishes reference potential for REF pin and defines cathode voltage (VKA). |
| REF (Pin 3) | Feedback threshold input | Senses divided output voltage; forces internal comparator to regulate when VREF = 1.24 V. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode headroom-enables use in 1.8 V and 3.3 V systems where TL431 fails. |
| B-grade precision | ±0.5% initial reference tolerance at 25°C-reduces calibration overhead in precision ADC references and sensor biasing. |
| Ultra-low IREF | 0.1–0.5 μA reference pin current-permits >1 MΩ feedback dividers, minimizing power loss and noise coupling. |
| Wide cathode current range | 100 μA minimum ensures regulation in standby modes; 70 mA max supports direct LED drive or error amp sinking. |
| Internal compensation | Stable without output capacitor-simplifies layout in space-constrained flyback controllers and eliminates capacitor aging risk. |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Provides stable 2.5 V or 4.096 V reference for 12–16-bit SAR and delta-sigma ADCs in battery-powered instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference generating fixed VREF via resistor divider; replaces discrete Zener + op-amp combos. Use Value: 0.5% tolerance and 0.25 Ω impedance minimize code-width variation and improve effective number of bits (ENOB) at full scale. |
Use Scenario: Regulates 3.3 V output in isolated AC/DC flyback converter using PC817 optocoupler feedback loop. IC Role / Device Role / Timing Role: Error amplifier and voltage reference on secondary side; compares scaled output to 1.24 V and drives opto-LED. Use Value: Enables <2.7 V minimum regulated output (1.24 V + 1.4 V LED drop); supports compact, low-noise 3.3 V rail design. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replaces 2.5 V, 500 mW Zener in 5 V LDO pre-regulator circuit for microcontroller core supply. IC Role / Device Role / Timing Role: Adjustable shunt regulator clamping excess voltage; dissipates only required power via cathode current. Use Value: 100 μA minimum current and 0.1 μA off-state leakage reduce quiescent power by >95% vs. standard Zeners. |
Use Scenario: Monitors 12 V automotive subsystem rail for undervoltage lockout (UVLO) at 10.5 V threshold. IC Role / Device Role / Timing Role: Open-loop comparator with integrated 1.24 V reference; triggers MCU reset when divided rail drops below threshold. Use Value: Eliminates external reference IC; sharp turn-on characteristic ensures clean, jitter-free reset assertion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBZRG4 | 1% reference tolerance (A grade) vs. 0.5% (B grade); otherwise identical electrical specs and pinout. | Suitable where ±1% accuracy suffices-e.g., non-critical biasing or coarse voltage monitoring. | Select TLVH431ACDBZRG4 for cost-sensitive designs accepting wider reference drift across temperature. |
| TLVH432BCDBZRG4 | Same B-grade tolerance and specs, but reversed pinout: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. | Requires PCB layout revision; used where alternate routing simplifies optocoupler connection in flyback topologies. | Choose TLVH432BCDBZRG4 only if schematic/layout accommodates swapped CATHODE/REF pins-no drop-in replacement. |
Compared with TLVH431BCDBZRG4, TLVH431ACDBZRG4 trades 0.5% precision for lower unit cost, while TLVH432BCDBZRG4 offers identical performance in a mechanically compatible but electrically non-interchangeable pinout-both require explicit validation in the target feedback network.
Availability
TLVH431BCDBZRG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS designs, precision ADC references, automotive voltage monitors, and low-leakage Zener replacements requiring stable component supply across extended temperature ranges.
Supply support for TLVH431BCDBZRG4 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The TLVH431 family was designed as a low-voltage, high-precision upgrade to the TL431 for next-generation power management in space- and power-constrained systems.
FAQ
What is the reference voltage tolerance of TLVH431BCDBZRG4 at 25°C?
The TLVH431BCDBZRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.234 V to 1.246 V. This B-grade precision is confirmed in Section 5.7 of the SLVS555N datasheet and applies specifically to the TLVH431BCDBZRG4 variant with SOT-23-3 packaging.
Can TLVH431BCDBZRG4 operate with cathode voltage below 2.5 V?
Yes, TLVH431BCDBZRG4 operates with cathode-to-anode voltage as low as 1.24 V-its internal reference voltage-making it functional in 1.8 V and 3.3 V systems where legacy TL431 devices fail. Minimum headroom is defined by VKA ≥ VREF, and the device maintains regulation down to 100 μA cathode current at this voltage.
Is TLVH431BCDBZRG4 pin-compatible with TLVH432BCDBZRG4?
No, TLVH431BCDBZRG4 is not pin-compatible with TLVH432BCDBZRG4. While both use SOT-23-3 packages, TLVH431BCDBZRG4 has Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF; TLVH432BCDBZRG4 uses Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. Swapping them without layout changes will cause circuit failure.
What is the maximum cathode current rating for TLVH431BCDBZRG4?
The absolute maximum cathode current for TLVH431BCDBZRG4 is 80 mA (per Section 5.1 Absolute Maximum Ratings), but the recommended continuous operating range is 0.1 mA to 70 mA (Section 5.3). Exceeding 70 mA risks thermal overload in SOT-23-3 without heatsinking, given its 206 °C/W junction-to-ambient thermal resistance.
Does TLVH431BCDBZRG4 require an output capacitor for stability?
No, TLVH431BCDBZRG4 is internally compensated and stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is added for filtering, Figures 5-15–5-17 in the datasheet must be consulted to select values that maintain ≥45° phase margin across operating conditions-including cathode voltage (1.25 V to 5 V) and load capacitance.
TLVH431BCDBZRG4 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:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 18 V
- Current - Output:
- 70 mA
- Tolerance:
- ±0.5%
- 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
TLVH431BCDBZRG4 FAQ
1.How can I place an order for TLVH431BCDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCDBZRG4 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 TLVH431BCDBZRG4 reliable?
The price and inventory of TLVH431BCDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCDBZRG4 is usually 5 days.
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Once your TLVH431BCDBZRG4 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 TLVH431BCDBZRG4?
For technical support, including TLVH431BCDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCDBZRG4 requirements.
6.How does Aetrix verify that TLVH431BCDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431BCDBZRG4 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 TLVH431BCDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLVH431BCDBZRG4?
All TLVH431BCDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCDBZRG4, 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 TLVH431BCDBZRG4 part is unused and in its original packaging.
Return procedure for TLVH431BCDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BCDBZRG4 Tags
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