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Texas Instruments TLVH431ACDBVRG4
- Part No.:
- TLVH431ACDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431ACDBVRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,127
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Product details
Overview
TLVH431ACDBVRG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 1.24 V reference voltage, ±0.5% initial tolerance at 25°C (A-grade), and operation down to 100 µA cathode current. It delivers 0.25 Ω typical dynamic impedance and supports output voltage adjustment from 1.24 V to 18 V using two external resistors-enabling use in isolated flyback SMPS secondary-side regulation and low-voltage Zener replacement.
For engineers reviewing the TLVH431ACDBVRG4 datasheet, TLVH431ACDBVRG4 pinout, TLVH431ACDBVRG4 application, or TLVH431ACDBVRG4 equivalent, key selection criteria include reference accuracy over –40°C to +125°C, ultra-low IREF (≤0.5 µA), stable closed-loop regulation without output capacitance, and compatibility with optocoupler-based feedback in 3.3 V/5 V power supplies.
Technical Context
The TLVH431ACDBVRG4 implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation via cathode-current-controlled sink behavior. Its internal 1.24 V reference is compared against the REF pin voltage, driving cathode current to maintain regulation when feedback is applied.
It operates in two distinct functional modes: open-loop comparator mode (with integrated reference for voltage monitoring) and closed-loop shunt regulator mode (for adjustable voltage references and error amplification). Thermal stability is specified across –40°C to +125°C (Q-grade), with <±31 mV VREF deviation over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets minimum regulation threshold and defines resistor-divider scaling for output voltage setting |
| Cathode Current Range | 100 µA to 70 mA - enables operation in ultra-low-power systems and high-current shunt applications without external biasing |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients and minimizes output ripple |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments requiring extended thermal reliability |
| Reference Input Current | 0.1–0.5 µA - reduces divider network loading error and allows high-impedance resistor selection (e.g., >1 MΩ) |
| Output Voltage Range | 1.24 V to 18 V - achieved via external R1/R2 divider; supports wide-range DC-DC feedback and programmable references |
| VREF/VKA Ratio | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage variation; critical for high-accuracy regulation |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount with exposed substrate connection on Pin 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: NC | No internal connection | Must be left unconnected; no electrical function or parasitic coupling |
| Pin 2: Substrate | Internal die substrate connection | Must be connected to ANODE (Pin 5) or left floating; affects thermal performance and ESD robustness |
| Pin 3: CATHODE | Current sink output / regulation node | Primary current path for shunt regulation; connects to supply rail or optocoupler LED anode in isolated SMPS |
| Pin 4: REF | Reference input / feedback sense | High-impedance input sensing voltage divider output; determines regulation point via VREF = VREF × (1 + R1/R2) |
| Pin 5: ANODE | Common return / ground reference | Low-impedance return path; must be tied to system ground or power rail common point for stable reference operation |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates from 1.24 V cathode-to-anode - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 cannot operate |
| Ultra-low reference current | IREF ≤ 0.5 µA - permits high-resistance feedback dividers, reducing quiescent power and improving battery life in portable designs |
| Internally compensated | Stable without output capacitor - eliminates need for external compensation components in most shunt regulator configurations |
| Sharp turn-on characteristic | High open-loop gain (>60 dB) - provides fast comparator response and clean switching behavior in voltage-monitoring applications |
| Wide cathode current range | 100 µA to 70 mA - supports both micro-power sensing and high-current shunt regulation in same device family |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Precision ADC/DAC reference requiring stable, low-drift voltage source independent of supply rail variations. IC Role / Device Role / Timing Role: Adjustable shunt reference providing programmable 1.24–18 V reference voltage with <±0.5% initial accuracy and <±31 mV tempco. Use Value: Eliminates need for discrete Zener + op-amp reference circuits; reduces BOM count and layout area while improving long-term stability. |
Use Scenario: Isolated DC-DC converter feedback loop where secondary-side voltage sensing drives optocoupler LED current. IC Role / Device Role / Timing Role: Error amplifier + reference in closed-loop configuration; compares sampled output voltage against internal 1.24 V reference. Use Value: Enables regulation down to 2.7 V output in 3.3 V flyback topologies; supports tight line/load regulation with minimal external components. |
| Zener Diode Replacement | Power Rail Voltage Monitoring |
Use Scenario: Low-leakage, temperature-stable replacement for 1.2–18 V Zener diodes in on-board regulation and bias networks. IC Role / Device Role / Timing Role: Active shunt regulator with 0.25 Ω dynamic impedance and <0.1 µA off-state cathode current. Use Value: Reduces leakage by >10× vs. standard Zeners; improves efficiency in standby modes and extends battery runtime. |
Use Scenario: Supervisory circuit detecting undervoltage/overvoltage conditions on 3.3 V, 5 V, or 12 V rails. IC Role / Device Role / Timing Role: Open-loop comparator with integrated 1.24 V reference; triggers reset or alert when rail deviates from set threshold. Use Value: Single-component solution replacing comparator + external reference; simplifies design and improves threshold accuracy over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBZRG4 | SOT-23-3 package (3-pin), different pinout (REF–CATHODE–ANODE); no substrate pin; smaller footprint (2.92 mm × 1.30 mm) | Lacks Pin 2 substrate connection; unsuitable where substrate grounding improves thermal/ESD performance | Select for space-constrained PCBs where simplified 3-pin layout and absence of substrate tie are acceptable |
| TLVH431BIDBVRG4 | Same SOT-23-5 package but 0.5% tolerance (B-grade) and –40°C to +85°C rating (I-grade), not Q-grade | Lower temperature range limits use in under-hood automotive or high-temp industrial environments | Select when cost sensitivity outweighs extended temperature requirement and tighter initial tolerance is needed |
Compared with TLVH431ACDBVRG4, TLVH431ACDBZRG4 offers reduced board area but sacrifices substrate control and thermal dissipation capability, while TLVH431BIDBVRG4 trades automotive-grade temperature range for lower unit cost and identical 0.5% accuracy-making each suitable for distinct thermal, layout, and qualification requirements.
Availability
TLVH431ACDBVRG4 is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision data converter references, and low-voltage Zener replacement applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDBVRG4 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, with leadership in precision analog, power management, and signal chain technologies.
The TLVH431 product line was designed for low-voltage, high-accuracy shunt regulation in space- and power-constrained systems-including isolated power supplies, sensor interfaces, and battery-powered instrumentation.
FAQ
What is the reference voltage tolerance of TLVH431ACDBVRG4 at 25°C?
The TLVH431ACDBVRG4 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal VREF with a range of 1.234 V to 1.246 V. This A-grade specification is confirmed in Section 5.6 of the TI datasheet SLVS555N and applies specifically to the TLVH431AC variant in DBV packaging.
Can TLVH431ACDBVRG4 operate with cathode current below 100 µA?
No-TLVH431ACDBVRG4 requires ≥100 µA cathode current (IK(min)) to enter and maintain regulation. Below this threshold, open-loop gain drops significantly, causing poor reference tracking and unstable output. The datasheet specifies 60–100 µA as the minimum range depending on temperature, with 100 µA being the guaranteed maximum for reliable closed-loop operation.
Does TLVH431ACDBVRG4 require an output capacitor for stability?
No, TLVH431ACDBVRG4 is internally compensated and remains stable without an output capacitor between CATHODE and ANODE. However, if added, capacitive loads up to 10 nF can be used safely per Figure 5-15–5-17; larger values may reduce phase margin and require careful stability analysis in closed-loop configurations.
What is the function of Pin 2 (substrate) on TLVH431ACDBVRG4?
Pin 2 on TLVH431ACDBVRG4 is the internal die substrate connection and must be connected to ANODE (Pin 5) or left electrically floating. It is not a signal pin and has no internal circuit connection. Proper substrate tie improves thermal conduction and ESD robustness but does not affect basic regulation functionality.
How does TLVH431ACDBVRG4 differ from TLVH432 variants?
TLVH431ACDBVRG4 and TLVH432 share identical electrical specifications but differ in pinout: TLVH431 uses REF–CATHODE–ANODE–NC–Substrate (SOT-23-5), while TLVH432 uses CATHODE–REF–ANODE (SOT-23-3). TLVH431ACDBVRG4's 5-pin layout supports substrate grounding and higher thermal performance, whereas TLVH432 prioritizes compact 3-pin routing.
TLVH431ACDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- 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:
- ±1%
- 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
TLVH431ACDBVRG4 FAQ
1.How can I place an order for TLVH431ACDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDBVRG4 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 TLVH431ACDBVRG4 reliable?
The price and inventory of TLVH431ACDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDBVRG4 is usually 5 days.
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TLVH431ACDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDBVRG4 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 TLVH431ACDBVRG4?
For technical support, including TLVH431ACDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDBVRG4 requirements.
6.How does Aetrix verify that TLVH431ACDBVRG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDBVRG4 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 TLVH431ACDBVRG4 meets industry standards.
7.What is the process for return or replacement of TLVH431ACDBVRG4?
All TLVH431ACDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDBVRG4, 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 TLVH431ACDBVRG4 part is unused and in its original packaging.
Return procedure for TLVH431ACDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDBVRG4 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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