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Texas Instruments TLVH431BILP
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- Part No.:
- TLVH431BILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
TLVH431BILP.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,252
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Product details
Overview
TLVH431BILP from Texas Instruments is a low-voltage adjustable precision shunt regulator in TO-92 package, providing 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It serves as an ultra-low-leakage Zener replacement and integrated comparator reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431BILP datasheet, TLVH431BILP pinout, TLVH431BILP application, or TLVH431BILP equivalent, key selection criteria include its 0.25 Ω dynamic impedance, 1.24 V minimum regulation voltage, TO-92 thermal resistance (140°C/W), and compatibility with optocoupler-based secondary-side regulation for 3.3 V systems.
Technical Context
The TLVH431BILP implements a three-terminal shunt topology with internal 1.24 V bandgap reference and high-gain NPN Darlington output stage. Its open-loop mode functions as a comparator with integrated reference; closed-loop configuration enables precise voltage regulation via resistive divider feedback between cathode and reference pins.
It operates down to 1.24 V cathode-anode voltage, requires ≥100 μA cathode current for regulation, and maintains stability without external compensation. The device exhibits 0.1–0.5 μA reference terminal current and <0.1 μA off-state cathode leakage at 18 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets minimum regulation point and defines accuracy of adjustable output (VO = VREF × (1 + R1/R2)) |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and higher-current shunt regulation without external gain stages |
| 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 |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider error and enables high-impedance sensing networks |
| Output Voltage Range | 1.24 V to 18 V - achieved with two external resistors; enables direct replacement of Zeners up to 18 V |
| Thermal Resistance (RθJA) | 140°C/W (TO-92) - determines maximum power dissipation (e.g., 350 mW at TA = 85°C) |
Pinout & Package
TLVH431BILP uses a 3-pin TO-92 package (4.30 mm × 4.30 mm body) with through-hole mounting and standard JEDEC TO-92 mechanical outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / regulated output node | Primary current path; sinks cathode current to maintain VREF at pin 3; connects to optocoupler LED anode in isolated SMPS |
| ANODE (Pin 2) | Common return / ground reference | Low-impedance return path for cathode current; must be connected to system ground or common rail in all configurations |
| REF (Pin 3) | Reference input / feedback sense node | Senses voltage divider output; internal comparator compares this to 1.24 V; requires ≥0.1 μA bias current for proper operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode voltage - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 cannot function |
| High initial accuracy | ±0.5% VREF tolerance at 25°C (B-grade) - reduces calibration overhead in precision ADC references and voltage monitors |
| Ultra-low reference current | 0.1–0.5 μA IREF - permits use of >1 MΩ feedback dividers, minimizing power loss and noise coupling |
| Wide temperature range | Specified from –40°C to +125°C - supports automotive engine control units and industrial motor drives without derating |
| Stable without output capacitor | No mandatory cathode-to-anode capacitor required - simplifies layout and eliminates capacitor aging/failure modes in long-life designs |
Applications
| Isolated Flyback SMPS Feedback | Adjustable Precision Reference |
|---|---|
Use Scenario: Secondary-side voltage regulation in 3.3 V isolated DC/DC converters using optocoupler feedback. IC Role / Device Role / Timing Role: Shunt regulator and error amplifier - compares divided output voltage against internal 1.24 V reference and adjusts optocoupler LED current. Use Value: Enables stable 3.3 V output with <±1% regulation over line/load/temperature, replacing discrete op-amp + Zener solutions. |
Use Scenario: Setting precise reference voltage for SAR and delta-sigma ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Adjustable voltage reference - configured with 0.1% metal-film resistors to generate 2.048 V or 4.096 V reference rails. Use Value: Delivers <10 ppm/°C drift and 0.25 Ω output impedance, reducing code-width variation and improving ENOB by ≥0.5 bits. |
| Voltage Monitoring & Supervision | Low-Leakage Zener Replacement |
Use Scenario: Monitoring 5 V and 12 V power rails in programmable logic controllers for brownout detection. IC Role / Device Role / Timing Role: Comparator with integrated reference - REF pin tied to resistor divider; CATHODE pulled high via pull-up to detect undervoltage events. Use Value: Eliminates external reference IC, reduces BOM count by 2 components, and achieves <10 μs response time due to high open-loop gain. |
Use Scenario: Replacing 3.3 V and 5.1 V Zener diodes in battery-powered IoT sensor nodes. IC Role / Device Role / Timing Role: Precision shunt clamp - regulates voltage across load while drawing only 100 μA minimum cathode current. Use Value: Reduces standby current by >95% versus standard Zeners (typ. 500 μA vs. 5 μA), extending coin-cell battery life by 3×. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AILP | 1% initial VREF tolerance (A-grade) vs. 0.5% (B-grade); otherwise identical electrical specs and TO-92 package | Suitable where ±1% reference accuracy suffices, e.g., non-critical power sequencing or coarse voltage supervision | Select TLVH431AILP when cost sensitivity outweighs need for highest accuracy; same footprint and thermal behavior |
| TLVH431BIDBZ | SOT-23-3 package (2.92 mm × 1.30 mm); 206°C/W RθJA; identical B-grade specs and pinout (CATHODE–ANODE–REF) | Better suited for space-constrained PCBs and automated SMT assembly; lower thermal mass but higher junction temp rise at same power | Choose TLVH431BIDBZ for compact, high-volume consumer electronics; TLVH431BILP preferred for through-hole prototyping or high-reliability thermal management |
Compared with TLVH431AILP and TLVH431BIDBZ, TLVH431BILP offers the tightest initial tolerance in a through-hole TO-92 package, delivering superior thermal robustness (140°C/W) and ease of manual rework-critical for industrial field-service and validation labs.
Availability
TLVH431BILP is available at Aetrix Electronics and suitable for isolated power supplies, precision analog references, and industrial voltage supervision requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TLVH431BILP 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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in precision voltage references and power conversion ICs.
The TLVH431 family was designed specifically to replace Zener diodes and legacy TL431s in low-voltage, high-accuracy shunt regulation applications-including isolated SMPS feedback, data converter references, and system-level voltage monitoring.
FAQ
What is the minimum cathode current required for regulation in TLVH431BILP?
The TLVH431BILP requires a minimum cathode current of 100 μA to maintain regulation across its full operating temperature range (–40°C to +125°C). Below this threshold, the device may exhibit reduced open-loop gain and unstable reference tracking. This value is specified in Section 5.5 of the TI datasheet SLVS555N and verified under IK(min) test conditions with VKA = VREF.
Can TLVH431BILP be used in place of a standard Zener diode?
Yes, TLVH431BILP serves as a high-performance Zener diode replacement with significantly lower leakage (<0.1 μA off-state), tighter voltage tolerance (±0.5% vs. ±5% typical for Zeners), and near-zero temperature coefficient. Its active regulation architecture provides sharp turn-on characteristics and 0.25 Ω dynamic impedance-far superior to passive Zener performance-making TLVH431BILP ideal for precision clamping and low-power biasing.
What is the pin configuration of TLVH431BILP in the TO-92 package?
TLVH431BILP uses a standard TO-92 pinout: Pin 1 is CATHODE, Pin 2 is ANODE, and Pin 3 is REF, viewed from the flat side with leads pointing downward. This matches Figure 4-3 in the TI datasheet SLVS555N and is electrically identical to TLVH431xxLP variants. No NC or substrate pins are present in this 3-pin variant.
Does TLVH431BILP require an output capacitor for stability?
No, TLVH431BILP is internally compensated and remains stable without an output capacitor between cathode and anode. This eliminates capacitor-related failure modes and simplifies design. However, if a capacitor is added for noise filtering, Figures 5-15 to 5-17 in the datasheet provide phase-margin guidance for capacitive loads up to 10 nF at various cathode voltages.
How does TLVH431BILP differ from TLVH432BILP?
TLVH431BILP and TLVH432BILP share identical electrical specifications and TO-92 packaging, but TLVH432BILP features reversed pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This alternate pinout supports legacy board layouts designed for TL431-compatible footprints. TLVH431BILP follows the standard TLVH431 pin assignment and is not pin-compatible with TLVH432BILP.
TLVH431BILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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):
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431BILP FAQ
1.How can I place an order for TLVH431BILP through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BILP 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 TLVH431BILP reliable?
The price and inventory of TLVH431BILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BILP is usually 5 days.
3.What payment methods are accepted for TLVH431BILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431BILP?
TLVH431BILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BILP 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 TLVH431BILP?
For technical support, including TLVH431BILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BILP requirements.
6.How does Aetrix verify that TLVH431BILP is sourced from the original manufacturer or authorized distributors?
All TLVH431BILP 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 TLVH431BILP meets industry standards.
7.What is the process for return or replacement of TLVH431BILP?
All TLVH431BILP units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BILP, 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 TLVH431BILP part is unused and in its original packaging.
Return procedure for TLVH431BILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BILP Tags
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