My Inquiry
My Account
Texas Instruments TLVH431BCDBVRG4
- Part No.:
- TLVH431BCDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431BCDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,985
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLVH431BCDBVRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-5 package, featuring 0.5% initial reference voltage tolerance (1.24 V 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 TLVH431BCDBVRG4 datasheet, TLVH431BCDBVRG4 pinout, TLVH431BCDBVRG4 application, or TLVH431BCDBVRG4 equivalent, key selection criteria include reference accuracy grade (B), thermal stability over industrial/automotive temperature ranges, cathode current headroom for regulation, and compatibility with optocoupler-based secondary-side control architectures.
Technical Context
The TLVH431BCDBVRG4 implements a 1.24 V bandgap reference with internal op-amp and Darlington output stage, enabling precise shunt regulation down to 1.24 V - 1.26 V lower than TL431. Its open-loop comparator mode supports voltage monitoring, while closed-loop configuration with external resistors sets output from VREF to 18 V.
It operates with typical 0.25 Ω dynamic impedance and maintains stable regulation across 100 μA–70 mA cathode current, with <0.1 μA off-state cathode current and ±2.7 mV/V cathode voltage sensitivity. The device is internally compensated and does not require an output capacitor for stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24 V ±0.5% at 25°C - defines minimum regulated output and sets resistor-divider ratio for adjustable voltage setting |
| Cathode Current Range | 100 μA to 70 mA - determines minimum bias for regulation and maximum shunt power handling (up to ~1.26 W at 18 V) |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial high-temp environments without derating |
| Dynamic Impedance | 0.25 Ω typical - ensures tight load regulation and low output voltage drift under varying cathode current |
| Reference Input Current | 0.1–0.5 μA - enables high-impedance feedback networks without significant divider error or power loss |
| Output Voltage Range | 1.24 V to 18 V - set by external R1/R2 divider; supports 3.3 V, 5 V, 12 V, and custom rails in isolated DC/DC designs |
| ESD Rating | ±2000 V HBM - meets standard handling requirements for automated assembly and board-level testing |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 0.95 mm max height, gull-wing leads, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No internal connection | Must be left unconnected; no electrical function or thermal path |
| 2 - NC (Substrate) | Substrate tie | Internally connected to die substrate; must be tied to ANODE or left floating - not grounded |
| 3 - CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to ANODE; connects to optocoupler LED anode in flyback designs |
| 4 - REF | Reference input | Senses feedback voltage; requires ≥0.1 μA bias current; connected to resistor divider midpoint |
| 5 - ANODE | Common return / ground reference | Low-impedance return path for cathode current; typically tied to system ground or power rail common |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage reference | 1.24 V threshold enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot operate |
| B-grade accuracy | ±0.5% VREF tolerance at 25°C reduces calibration overhead in precision power supplies and data converters |
| Ultra-low IREF | 0.1–0.5 μA reference pin current allows >10 MΩ feedback dividers, minimizing quiescent power in battery-backed circuits |
| Wide cathode current range | 100 μA minimum ensures stable regulation even in ultra-low-power standby modes of SMPS controllers |
| High-temperature operation | Specified to +125°C supports use in automotive engine control units and industrial motor drives without thermal derating |
Applications
| Isolated Flyback Secondary Regulation | Zener Diode Replacement |
|---|---|
|
Use Scenario: Regulating 3.3 V output in AC/DC adapter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Error amplifier and precision voltage reference on secondary side, comparing sampled output to internal 1.24 V reference. Use Value: Enables stable 3.3 V regulation with <1% total output error across line/load/temperature, replacing discrete Zener + op-amp solutions. |
Use Scenario: Providing 2.5 V reference for ADC biasing in portable medical sensor node. IC Role / Device Role / Timing Role: Adjustable shunt reference with ultra-low leakage (<0.1 μA off-state), replacing 2.5 V Zener diode. Use Value: Reduces reference current error by >95% vs. 5% tolerance Zener, improving ADC accuracy and extending battery life. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
|
Use Scenario: Detecting brownout on 5 V microcontroller supply in industrial PLC module. IC Role / Device Role / Timing Role: Precision comparator with built-in 1.24 V reference, configured with resistor divider to trigger at 4.75 V. Use Value: Eliminates need for external reference IC; achieves ±15 mV trip-point accuracy over –40°C to +85°C. |
Use Scenario: Threshold detection for battery charge termination at 4.2 V in Li-ion charger IC. IC Role / Device Role / Timing Role: Open-loop comparator comparing divided battery voltage to internal 1.24 V reference. Use Value: Provides sharp switching with <1 μs response and no external reference, reducing BOM count and layout area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 1% VREF tolerance (vs. 0.5%); identical pinout, package, and electrical specs otherwise | Suitable for cost-sensitive industrial supplies where ±1% output tolerance is acceptable | Select when tighter reference accuracy is not required and BOM cost reduction is prioritized |
| TLVH432BCDBZR | Same B-grade accuracy and specs, but 3-pin SOT-23-3 package (CATHODE–REF–ANODE pinout) | Used where PCB space is constrained and 3-pin layout simplifies routing in compact flyback designs | Choose for space-constrained layouts requiring simplified 3-pin footprint; verify pin compatibility with existing design |
Compared with TLVH431ACDBVR, TLVH431BCDBVRG4 delivers 0.5% reference accuracy critical for high-precision regulation, while TLVH432BCDBZR offers identical performance in a smaller 3-pin SOT-23 footprint - both alternatives require validation of thermal dissipation and feedback network loading in target applications.
Availability
TLVH431BCDBVRG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS, precision voltage monitoring, Zener replacement, and comparator-based threshold detection requiring stable component supply across automotive, industrial, and computing end equipment.
Supply support for TLVH431BCDBVRG4 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 delivering analog, embedded processing, and connectivity solutions with deep expertise in power management and precision analog ICs.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and precision monitoring - addressing limitations of legacy TL431 in sub-2.5 V systems.
FAQ
What is the reference voltage tolerance of TLVH431BCDBVRG4 at 25°C?
The TLVH431BCDBVRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a VREF range of 1.234 V to 1.246 V. This B-grade accuracy is specified in Section 5.7 of the TI datasheet and applies across all operating conditions unless otherwise noted. The TLVH431BCDBVRG4 maintains this tolerance over its full temperature range when used within recommended operating conditions.
Can TLVH431BCDBVRG4 replace TL431 in existing designs?
TLVH431BCDBVRG4 can replace TL431 only if the application operates above 1.24 V and accommodates different pinout and lower minimum cathode current (100 μA vs. 1 mA). It is not pin-compatible with TL431 due to its 5-pin SOT-23 layout and distinct internal architecture. The TLVH431BCDBVRG4 also requires revised feedback resistor values to account for its lower reference voltage and higher accuracy.
What is the minimum cathode current required for regulation in TLVH431BCDBVRG4?
The TLVH431BCDBVRG4 requires a minimum cathode current of 100 μA to maintain regulation, as specified in the "IK(min)" parameter under Electrical Characteristics. This value is guaranteed over the full temperature range (–40°C to +125°C) and is critical for stable operation in low-power standby modes. Below this threshold, the device may exit regulation and exhibit increased output impedance.
Does TLVH431BCDBVRG4 require an output capacitor for stability?
No, TLVH431BCDBVRG4 is internally compensated and does not require an output capacitor between CATHODE and ANODE for basic stability. However, if a capacitive load is added (e.g., for noise filtering), Figures 5-15 through 5-17 in the TI datasheet provide phase margin guidance to avoid oscillation. Stability must be verified empirically when adding >1 nF capacitance directly at the cathode node.
How does the substrate pin (Pin 2) on TLVH431BCDBVRG4 affect PCB layout?
Pin 2 of TLVH431BCDBVRG4 is an internal substrate connection that must be either tied to the ANODE net or left electrically floating - it must never be connected to ground or any other potential. Incorrect substrate connection can cause parametric shift or thermal instability. Layout best practice is to route Pin 2 directly to the ANODE copper pour or omit the pad entirely if unused, per TI's DBV package recommendations.
TLVH431BCDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±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-23-5
TLVH431BCDBVRG4 FAQ
1.How can I place an order for TLVH431BCDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BCDBVRG4 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 TLVH431BCDBVRG4 reliable?
The price and inventory of TLVH431BCDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BCDBVRG4 is usually 5 days.
3.What payment methods are accepted for TLVH431BCDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BCDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431BCDBVRG4?
TLVH431BCDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BCDBVRG4 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 TLVH431BCDBVRG4?
For technical support, including TLVH431BCDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BCDBVRG4 requirements.
6.How does Aetrix verify that TLVH431BCDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431BCDBVRG4 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 TLVH431BCDBVRG4 meets industry standards.
7.What is the process for return or replacement of TLVH431BCDBVRG4?
All TLVH431BCDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BCDBVRG4, 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 TLVH431BCDBVRG4 part is unused and in its original packaging.
Return procedure for TLVH431BCDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BCDBVRG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
