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Texas Instruments TLVH431ACDBVTG4
- Part No.:
- TLVH431ACDBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431ACDBVTG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,218
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Product details
Overview
TLVH431ACDBVTG4 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-23-5 package, featuring 1.24 V reference voltage (±1% at 25°C), 100 μA to 70 mA cathode current range, 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops for 3.3 V systems.
For engineers reviewing the TLVH431ACDBVTG4 datasheet, TLVH431ACDBVTG4 pinout, TLVH431ACDBVTG4 application, or TLVH431ACDBVTG4 equivalent, key selection criteria include reference tolerance grade (A = 1%), cathode current headroom for regulation, thermal stability across industrial temperature ranges, and compatibility with optocoupler-based secondary-side control architectures.
Technical Context
The TLVH431ACDBVTG4 implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal Darlington output stage enables sharp turn-on behavior and stable regulation down to 1.24 V, with no external compensation required for basic operation.
It operates in two functional modes: open-loop comparator mode (using integrated 1.24 V reference for voltage monitoring) and closed-loop shunt regulator mode (with resistive feedback from cathode to reference pin to set output voltage from 1.24 V to 18 V). Minimum cathode current of 100 μA ensures proper linear region operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets minimum adjustable output voltage and defines accuracy baseline for feedback networks |
| Cathode Current Range | 100 μA to 70 mA - determines minimum bias requirement for regulation and maximum shunt power handling capability |
| Dynamic Impedance | 0.25 Ω typical - enables tight voltage regulation under load transients without external capacitor stabilization |
| Operating Temperature | –40°C to +125°C - supports automotive and industrial applications requiring extended thermal robustness |
| Output Voltage Range | 1.24 V to 18 V - achieved via two external resistors, enabling flexible rail monitoring and adjustable reference generation |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance feedback networks |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage variation, critical for wide-input-range supplies |
Pinout & Package
SOT-23-5 package (2.90 mm × 1.60 mm body size) with exposed pad not electrically connected; requires standard SMT reflow profile per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NC | No internal connection | Must be left unconnected; no routing or grounding required |
| 2 - Substrate | Substrate connection | Must be connected to ANODE or left open; not a signal pin |
| 3 - CATHODE | Shunt current input / output node | Primary current path; connects to supply rail or optocoupler LED anode in feedback loops |
| 4 - REF | Reference input threshold node | Senses feedback voltage; must be biased with ≥0.5 μA to maintain amplifier operation |
| 5 - ANODE | Common return / ground reference | Typically tied to system ground; forms reference point for cathode and REF terminals |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 (2.5 V) cannot function |
| Ultra-low reference current | 0.1–0.5 μA - reduces divider resistor power loss and permits >1 MΩ feedback networks for high-impedance sensing |
| Wide cathode current range | 100 μA–70 mA - supports both micro-power monitoring and higher-current shunt regulation without external gain stages |
| Integrated thermal stability | Specified over –40°C to +125°C - eliminates need for external temperature compensation in harsh environments |
| Internal compensation | Stable without output capacitor - simplifies layout and avoids phase-margin issues common with capacitive loads |
Applications
| Isolated Flyback SMPS Feedback | Low-Voltage Rail Monitoring |
|---|---|
Use Scenario: Secondary-side voltage regulation in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and precision reference; compares sampled output voltage against 1.24 V internal reference and drives optocoupler LED current. Use Value: Enables regulation of output voltages as low as 2.7 V (1.24 V + optocoupler VF), extending design flexibility beyond TL431-based solutions. |
Use Scenario: Real-time monitoring of 1.2 V–3.3 V power rails in FPGA, ASIC, or microcontroller domains. IC Role / Device Role / Timing Role: Comparator with built-in reference; triggers fault signal when rail drops below programmed threshold. Use Value: Eliminates need for external reference IC and comparator, reducing BOM count and PCB area in space-constrained embedded systems. |
| Zener Diode Replacement | Adjustable Data Converter Reference |
Use Scenario: Replacing discrete Zener diodes in on-board regulation circuits requiring <1% accuracy and low leakage. IC Role / Device Role / Timing Role: Precision shunt regulator; sinks current to clamp voltage at setpoint defined by external resistors. Use Value: Reduces temperature coefficient drift (±31 mV over –40°C to +125°C) and leakage current (<0.1 μA off-state) versus 5% Zeners. |
Use Scenario: Providing programmable reference voltage for SAR or delta-sigma ADCs in test equipment and sensor interfaces. IC Role / Device Role / Timing Role: Adjustable voltage reference source; sets full-scale input range via resistor divider ratio. Use Value: Supports multiple input ranges (e.g., 1.24 V, 2.5 V, 5 V) from single BOM item, improving design reuse and calibration flexibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BDBVT | 0.5% initial reference tolerance (vs. 1% for TLVH431ACDBVTG4); otherwise identical electrical specs and pinout | Required where tighter reference accuracy is needed for high-resolution feedback or calibration-critical systems | Select TLVH431BDBVT when ±0.5% VREF tolerance is mandatory; same SOT-23-5 footprint and thermal performance |
| TLVH432ACDBZR | Same A-grade tolerance and specs, but 3-pin SOT-23 package with CATHODE–REF–ANODE pinout (vs. 5-pin DBV) | Preferred for cost-sensitive, space-constrained designs where substrate pin and NC are unnecessary | Choose TLVH432ACDBZR for simplified layout and lower unit cost; verify PCB pad compatibility before migration |
Compared with TLVH431BDBVT, TLVH431ACDBVTG4 trades 0.5% reference accuracy for lower cost and sufficient precision for most industrial power supplies; compared with TLVH432ACDBZR, it offers enhanced thermal dissipation via extra pins and substrate connection-critical for sustained 70 mA operation.
Availability
TLVH431ACDBVTG4 is available at Aetrix Electronics and suitable for isolated SMPS feedback, low-voltage rail monitoring, Zener replacement, precision ADC references, and comparator-based fault detection requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDBVTG4 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 reference and power control ICs.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in isolated power supplies and voltage-monitoring systems-addressing limitations of legacy TL431 in sub-2.5 V applications.
FAQ
What is the reference voltage tolerance of TLVH431ACDBVTG4 at 25°C?
The TLVH431ACDBVTG4 has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.228 V to 1.252 V. This A-grade tolerance is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies across all temperature grades (C/I/Q) of the TLVH431A variant. The TLVH431ACDBVTG4 part number explicitly denotes the A-grade tolerance.
Can TLVH431ACDBVTG4 operate with cathode current below 100 μA?
No-TLVH431ACDBVTG4 requires a minimum cathode current of 100 μA to maintain regulation and ensure proper amplifier biasing. Below this threshold, gain drops significantly, causing poor line/load regulation and delayed turn-on response. The datasheet specifies IK(min) = 60–100 μA depending on temperature grade, and 100 μA is the guaranteed maximum for full-spec operation across –40°C to +125°C.
What is the purpose of Pin 2 (Substrate) on TLVH431ACDBVTG4?
Pin 2 on TLVH431ACDBVTG4 is the substrate connection and must be connected to the ANODE terminal or left electrically floating-it is not a signal pin and carries no active circuit function. Leaving it unconnected is acceptable per TI's pin-function table; grounding it independently may cause latch-up or parametric shift. This pin is specific to the SOT-23-5 (DBV) package and absent in 3-pin variants.
How does TLVH431ACDBVTG4 differ from TL431 in low-voltage applications?
TLVH431ACDBVTG4 operates down to 1.24 V reference voltage and 100 μA minimum cathode current, whereas TL431 requires ≥2.5 V reference and ≥1 mA cathode current. This makes TLVH431ACDBVTG4 viable for 1.8 V and 3.3 V systems where TL431 cannot regulate. Additionally, TLVH431ACDBVTG4 offers superior thermal stability (±31 mV over –40°C to +125°C) and lower dynamic impedance (0.25 Ω vs. ~0.5 Ω).
Is an output capacitor required for stability with TLVH431ACDBVTG4?
No-TLVH431ACDBVTG4 is internally compensated and stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is used (e.g., for noise filtering), Figures 5-15–5-17 in the datasheet provide phase-margin guidance for 1.25 V, 2.5 V, and 5 V cathode voltages. Capacitor selection must avoid crossing the 0 dB gain crossover into instability.
TLVH431ACDBVTG4 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
TLVH431ACDBVTG4 FAQ
1.How can I place an order for TLVH431ACDBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDBVTG4 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 TLVH431ACDBVTG4 reliable?
The price and inventory of TLVH431ACDBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDBVTG4 is usually 5 days.
3.What payment methods are accepted for TLVH431ACDBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431ACDBVTG4?
TLVH431ACDBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDBVTG4 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 TLVH431ACDBVTG4?
For technical support, including TLVH431ACDBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDBVTG4 requirements.
6.How does Aetrix verify that TLVH431ACDBVTG4 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDBVTG4 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 TLVH431ACDBVTG4 meets industry standards.
7.What is the process for return or replacement of TLVH431ACDBVTG4?
All TLVH431ACDBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDBVTG4, 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 TLVH431ACDBVTG4 part is unused and in its original packaging.
Return procedure for TLVH431ACDBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDBVTG4 Tags
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LM4040CYM3-2.5-TR
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AZ431LANTR-G1
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