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Texas Instruments TLVH431BIDBZRG4
- Part No.:
- TLVH431BIDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TLVH431BIDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,221
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Product details
Overview
TLVH431BIDBZRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-3 package, featuring 0.5% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 100 µA cathode current. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops for 3.3 V systems.
For engineers reviewing the TLVH431BIDBZRG4 datasheet, TLVH431BIDBZRG4 pinout, TLVH431BIDBZRG4 application, or TLVH431BIDBZRG4 equivalent, key selection criteria include initial VREF accuracy, cathode current range (100 µA–70 mA), thermal stability over –40°C to +125°C, dynamic impedance (0.25 Ω), and compatibility with optocoupler-based secondary-side regulation.
Technical Context
The TLVH431BIDBZRG4 implements a bandgap-referenced error amplifier with internal 1.24 V reference and Darlington output stage, enabling precise shunt regulation without external compensation. Its open-loop comparator mode supports voltage monitoring, while closed-loop configuration with resistive divider sets output from 1.24 V to 18 V.
It operates with ≥1.24 V cathode-to-anode voltage and requires ≥100 µA cathode current for regulation. The device exhibits 0.25 Ω typical dynamic impedance and maintains 0.5% VREF tolerance across industrial temperature range (–40°C to +125°C) when qualified as Q-grade.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - enables accurate low-voltage regulation starting at 1.24 V, critical for 3.3 V and lower SMPS designs |
| Operating Cathode Current | 100 µA to 70 mA - supports ultra-low-power biasing and high-current shunt regulation without external amplification |
| Temperature Range | –40°C to +125°C - qualified for automotive and industrial environments where thermal robustness is mandatory |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback circuits |
| VREF Deviation (Full Range) | ±11 mV max (TLVH431BQ) - corresponds to <92 ppm/°C average TC, minimizing drift in precision references |
| Reference Input Current | 0.1–0.5 µA - allows high-impedance resistor dividers without significant loading error in voltage-setting networks |
| Cathode Voltage Range | 1.24 V to 18 V - supports wide-output adjustable supplies including post-regulation of 5 V, 12 V, and 15 V rails |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, surface-mount, gull-wing leads, JEDEC MO-178 compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to maintain VREF at REF pin; connects to optocoupler LED anode in isolated SMPS |
| 2: REF | Reference voltage sense input | High-impedance input (0.1–0.5 µA) tied to resistor divider midpoint; must not float; defines regulated output via R1/R2 ratio |
| 3: ANODE | Common return / ground reference | Low-impedance common node; typically connected to system ground or power rail return; substrate connection point in DBZ package |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24 V minimum cathode voltage-enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 fails |
| Ultra-low cathode current | 100 µA minimum regulation current-reduces standby power in energy-sensitive applications like IoT sensors and battery-backed supplies |
| Integrated reference + amplifier | Single-device replacement for Zener + op-amp combos-simplifies layout, improves accuracy, and eliminates external component drift |
| Stable without output capacitor | Internally compensated-eliminates need for cathode-to-anode bypass cap in most configurations, reducing BOM count and board space |
| High-temperature grade | Q-grade (–40°C to +125°C) qualification-ensures reliability in under-hood automotive, industrial motor drives, and telecom infrastructure |
Applications
| Secondary-Side Regulation in Isolated Flyback | Adjustable Voltage Reference for ADCs |
|---|---|
Use Scenario: Used with optocoupler in feedback loop of 3.3 V isolated flyback converter to regulate output voltage tightly. IC Role / Device Role / Timing Role: Error amplifier and precision reference-compares sampled output against 1.24 V internal reference and adjusts optocoupler LED current. Use Value: Enables regulation down to 2.7 V output (1.24 V + 1.4 V LED drop); 0.5% VREF tolerance ensures ±16.5 mV accuracy at 3.3 V. |
Use Scenario: Provides stable reference voltage for SAR or delta-sigma ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Low-drift, low-noise voltage reference source-sets full-scale input range independent of supply variation. Use Value: 0.25 Ω dynamic impedance and <1 µA reference current minimize code-dependent errors; ±11 mV full-range drift avoids calibration rework. |
| Zener Diode Replacement | Power Rail Voltage Monitor |
Use Scenario: Replaces discrete 2.5 V or 3.3 V Zener diodes in on-board regulation and bias networks. IC Role / Device Role / Timing Role: Adjustable shunt regulator-dissipates excess current to hold voltage constant across load variations. Use Value: 100 µA min current and 0.5% tolerance eliminate Zener leakage and tolerance stacking issues; SC-70/SOT-23 footprint saves >40% area vs TO-92. |
Use Scenario: Monitors 5 V or 12 V power rails for undervoltage lockout (UVLO) or brownout detection in microcontroller systems. IC Role / Device Role / Timing Role: Precision comparator with integrated reference-triggers reset or alert when rail drops below threshold. Use Value: Open-loop gain >100 dB enables sharp trip points; 0.1 µA REF current allows high-R divider for minimal quiescent draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBVRG4 | SOT-23-5 package (5-pin), includes NC and substrate pins; same electrical specs and 0.5% VREF tolerance | Requires PCB layout change due to 5-pin footprint and substrate connection requirement; used where enhanced thermal performance or noise isolation needed | Select when thermal resistance (RθJA = 206°C/W) or substrate grounding is prioritized over board area |
| TLVH431ACDBZRG4 | 1% VREF tolerance at 25°C (vs 0.5%); otherwise identical pinout, package, and operating range | Suitable for cost-sensitive applications where ±33 mV error at 3.3 V is acceptable; lower test cost reflected in pricing | Choose for non-critical regulation or monitoring where 0.5% accuracy is unnecessary and BOM cost reduction is primary goal |
Compared with TLVH431BIDBZRG4, TLVH431BIDBVRG4 offers better thermal dissipation but demands larger PCB real estate and substrate routing, while TLVH431ACDBZRG4 trades 0.5% accuracy for lower unit cost-making the B-grade optimal for precision 3.3 V SMPS feedback where stability and low drift are design-critical.
Availability
TLVH431BIDBZRG4 is available at Aetrix Electronics and suitable for isolated flyback SMPS feedback, precision ADC reference, and power rail monitoring requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431BIDBZRG4 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 control technologies.
The TLVH431 family was designed for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications-including isolated DC/DC converters, sensor signal chains, and safety-critical power monitors.
FAQ
What is the reference voltage tolerance of TLVH431BIDBZRG4 at 25°C?
The TLVH431BIDBZRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with min/max bounds of 1.234 V and 1.246 V. This grade (B) is specified in Section 5.7 of the TI datasheet SLVS555N and applies across all temperature grades including the Q-grade (–40°C to +125°C) variant of TLVH431BIDBZRG4.
Can TLVH431BIDBZRG4 operate with cathode current below 100 µA?
No-TLVH431BIDBZRG4 requires ≥100 µA cathode current to enter regulation and maintain specified VREF accuracy and dynamic impedance. Below this threshold, open-loop gain drops significantly, causing poor regulation and increased VREF deviation. The datasheet specifies IK(min) = 60–100 µA depending on temperature, with 100 µA guaranteed for full-range operation.
How does TLVH431BIDBZRG4 differ from TL431 in practical design?
TLVH431BIDBZRG4 operates down to 1.24 V reference voltage and 100 µA cathode current, whereas TL431 requires 2.5 V VREF and ≥1 mA IK. This enables TLVH431BIDBZRG4 to regulate 3.3 V and lower outputs in flyback converters without additional level-shifting, reduces standby power by 10×, and supports higher-impedance feedback dividers.
Is an output capacitor required for stability with TLVH431BIDBZRG4?
No-TLVH431BIDBZRG4 is internally compensated and stable without a cathode-to-anode output capacitor in standard configurations. However, if capacitive loading exceeds ~1 nF or phase margin is marginal in high-gain feedback loops, Figure 5-15 through 5-17 in the datasheet provide guidance for selecting stabilizing capacitance based on VKA and load conditions.
What is the maximum cathode voltage rating for TLVH431BIDBZRG4?
The absolute maximum cathode voltage (VKA) for TLVH431BIDBZRG4 is 20 V, referenced to the ANODE pin. Continuous operation is rated up to 18 V per Recommended Operating Conditions (Section 5.3). Exceeding 20 V risks permanent damage, and operation above 18 V degrades long-term reliability even if within absolute max limits.
TLVH431BIDBZRG4 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:
- ±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:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TLVH431BIDBZRG4 FAQ
1.How can I place an order for TLVH431BIDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BIDBZRG4 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 TLVH431BIDBZRG4 reliable?
The price and inventory of TLVH431BIDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BIDBZRG4 is usually 5 days.
3.What payment methods are accepted for TLVH431BIDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BIDBZRG4 transactions.
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4.How is shipping managed for TLVH431BIDBZRG4?
TLVH431BIDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BIDBZRG4 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 TLVH431BIDBZRG4?
For technical support, including TLVH431BIDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BIDBZRG4 requirements.
6.How does Aetrix verify that TLVH431BIDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431BIDBZRG4 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 TLVH431BIDBZRG4 meets industry standards.
7.What is the process for return or replacement of TLVH431BIDBZRG4?
All TLVH431BIDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BIDBZRG4, 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 TLVH431BIDBZRG4 part is unused and in its original packaging.
Return procedure for TLVH431BIDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BIDBZRG4 Tags
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