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Texas Instruments TLVH431ACDBVTE4
- Part No.:
- TLVH431ACDBVTE4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
TLVH431ACDBVTE4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,104
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Product details
Overview
TLVH431ACDBVTE4 from Texas Instruments is a low-voltage adjustable precision shunt regulator IC with 1.24 V reference voltage, ±1% initial tolerance at 25°C (A-grade), and operation down to 1.24 V cathode-anode voltage. It delivers 100 μA to 70 mA cathode current, 0.25 Ω typical dynamic impedance, and full-spec performance from –40°C to +125°C. It serves as an ultra-low-voltage Zener replacement and error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431ACDBVTE4 datasheet, TLVH431ACDBVTE4 pinout, TLVH431ACDBVTE4 application, or TLVH431ACDBVTE4 equivalent, key selection criteria include reference accuracy over temperature, minimum cathode current for regulation (100 μA), dynamic impedance stability under load, and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLVH431ACDBVTE4 integrates a precision 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington sink output stage. Its open-loop comparator mode enables voltage monitoring without external reference; closed-loop configuration with two resistors sets output voltage from VREF to 18 V.
It operates with no external compensation required and maintains stability across capacitive loads up to 10 nF, verified via phase margin testing at 1.25 V, 2.5 V, and 5 V cathode voltages. The device's 0.1 μA reference terminal current and <0.1 μA off-state cathode leakage support ultra-low-power rail monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±1% at 25°C - defines minimum regulated output and sets feedback divider ratio baseline |
| Cathode Current Range | 100 μA to 70 mA - supports regulation from ultra-low-power monitoring to medium-current shunt applications |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments without derating |
| Reference Input Current | 0.1–0.5 μA - minimizes divider resistor power loss and enables high-impedance sensing networks |
| Output Voltage Range | VREF to 18 V - adjustable via external R1/R2 divider, enabling flexible system-level voltage setting |
| Line Regulation | –1.5 to –2.7 mV/V - quantifies reference voltage drift vs. cathode voltage, critical for wide-input-range supplies |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount with exposed thermal pad (not electrically connected). Pin 1 = NC (no internal connection); Pin 2 = substrate connection (must tie to ANODE or leave open); Pin 3 = CATHODE; Pin 4 = REF; Pin 5 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (NC) | No internal connection | Unused; must remain unconnected or grounded per layout best practice |
| Pin 2 (Substrate) | Internal die substrate | Must be connected to ANODE or left floating - not tied to ground or signal |
| Pin 3 (CATHODE) | Current sink output | Primary shunt path; connects to supply rail or optocoupler LED anode in feedback loops |
| Pin 4 (REF) | Reference input | Senses divided output voltage; requires ≥0.1 μA bias current for proper amplifier operation |
| Pin 5 (ANODE) | Common return | Typically tied to system ground or low-side return path; establishes reference potential |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-anode differential - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 fails |
| Ultra-low reference current | 0.1–0.5 μA at REF pin - permits >1 MΩ feedback dividers, reducing quiescent power by >90% vs. TL431 |
| High-temperature grade | Specified from –40°C to +125°C (Q-grade variant) - supports under-hood automotive and industrial control applications |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode bypass cap in most configurations, simplifying layout |
| Zener replacement capability | 0.02–0.1 μA off-state cathode leakage - outperforms standard Zeners in low-leakage rail monitoring and battery-sense circuits |
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: Adjustable shunt regulator and error amplifier - compares divided output against internal 1.24 V reference and sinks cathode current to modulate optocoupler LED drive. Use Value: Enables stable regulation at 3.3 V with <2.7 V minimum output capability (1.24 V + opto VF), eliminating need for auxiliary winding or LDO post-regulator. |
Use Scenario: Real-time monitoring of 1.8 V or 2.5 V logic rails for brown-out detection or supervisor triggering. IC Role / Device Role / Timing Role: Precision comparator with integrated reference - REF pin biased to rail voltage via resistor divider; CATHODE pulled high until threshold breach. Use Value: Achieves ±1% trip accuracy over –40°C to +125°C with <0.1 μA static current, extending battery life in portable and IoT edge nodes. |
| Adjustable Reference for ADC/DAC | Zener Diode Replacement |
|
Use Scenario: Providing programmable reference voltage to SAR or delta-sigma ADCs in data acquisition systems. IC Role / Device Role / Timing Role: Adjustable voltage reference source - configured with precision R1/R2 to set exact VREF (e.g., 2.048 V, 4.096 V) independent of supply variation. Use Value: Delivers 0.25 Ω dynamic impedance and <12 mV total VREF deviation over temperature - improves ENOB by ≥0.5 bits vs. discrete Zener + op-amp solutions. |
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in on-board regulation, LDO feedback, or clamp circuits. IC Role / Device Role / Timing Role: Active shunt regulator - sinks current above threshold to hold voltage steady, with sharp turn-on and low tempco. Use Value: Reduces leakage current by 10× vs. 5% tolerance Zeners and improves thermal stability (±31 mV over –40°C to +125°C), minimizing calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBV | 0.5% initial VREF tolerance (B-grade) vs. 1% (A-grade); identical pinout, package, and temperature range | Required where tighter reference accuracy is needed for high-resolution ADC references or precision power sequencing | Select TLVH431BIDBV when ±0.5% room-temperature accuracy is mandatory; otherwise TLVH431ACDBVTE4 offers optimal cost/accuracy balance |
| TLV431ACDBVR | Lower max cathode voltage (6 V vs. 18 V); same 1.24 V VREF, SOT-23-5 package, but only rated to 85°C | Suitable for low-voltage (<6 V) consumer or computing applications where extended temperature range is unnecessary | Choose TLV431ACDBVR only for cost-sensitive, non-industrial designs with ≤6 V cathode swing and ambient ≤85°C |
Compared with TLVH431BIDBV, TLVH431ACDBVTE4 trades 0.5% reference accuracy for lower unit cost and broader availability; versus TLV431ACDBVR, it adds 12 V extra cathode headroom and 40°C higher operating temperature - essential for automotive and industrial isolation barriers.
Availability
TLVH431ACDBVTE4 is available at Aetrix Electronics and suitable for isolated power supplies, battery management systems, and precision analog monitoring requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH431ACDBVTE4 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 emphasis on reliability, longevity, and design-in support.
The TLVH431 family was engineered specifically for low-voltage shunt regulation in isolated DC/DC converters and precision voltage monitoring - addressing limitations of legacy TL431 in sub-2.5 V systems.
FAQ
What is the minimum cathode current required for regulation in TLVH431ACDBVTE4?
The TLVH431ACDBVTE4 requires a minimum cathode current of 100 μA to maintain regulation across its full temperature range (–40°C to +125°C). This value is specified in the Electrical Characteristics table under IK(min) and is critical for ensuring stable operation in low-power monitoring and flyback feedback applications. Below this threshold, gain drops and regulation degrades.
Can TLVH431ACDBVTE4 replace a standard Zener diode in a 1.8 V rail monitor?
Yes, TLVH431ACDBVTE4 is explicitly designed as a superior Zener replacement. With 1.24 V reference, ±1% tolerance, 0.02–0.1 μA off-state leakage, and sharp turn-on, it provides significantly better accuracy, temperature stability, and low-leakage performance than discrete Zeners - especially in 1.8 V systems where traditional Zeners lack sufficient headroom.
What is the function of Pin 2 (substrate) on the TLVH431ACDBVTE4 DBV package?
Pin 2 on the TLVH431ACDBVTE4 SOT-23-5 (DBV) package is the internal die substrate connection. Per TI's datasheet, it must be connected to the ANODE pin or left electrically open - never tied to ground or signal. This prevents latch-up and ensures proper thermal and electrical behavior in high-reliability applications.
Does TLVH431ACDBVTE4 require an output capacitor for stability?
No, TLVH431ACDBVTE4 is internally compensated and remains stable without an output capacitor between CATHODE and ANODE in most configurations. However, if a capacitor is used for noise filtering or transient response shaping, Figures 5-15 through 5-17 in the datasheet provide phase-margin guidance for selecting values up to 10 nF depending on cathode voltage.
How does the reference input current (Iref) of TLVH431ACDBVTE4 affect feedback resistor selection?
The TLVH431ACDBVTE4 reference input current is 0.1–0.5 μA, meaning feedback resistors can be sized up to ~1 MΩ without introducing significant voltage error. For example, using 499 kΩ and 100 kΩ resistors yields <0.05% additional error - enabling high-impedance, low-power divider networks that reduce standby current by orders of magnitude compared to TL431-based designs.
TLVH431ACDBVTE4 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
TLVH431ACDBVTE4 FAQ
1.How can I place an order for TLVH431ACDBVTE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431ACDBVTE4 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 TLVH431ACDBVTE4 reliable?
The price and inventory of TLVH431ACDBVTE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431ACDBVTE4 is usually 5 days.
3.What payment methods are accepted for TLVH431ACDBVTE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431ACDBVTE4 transactions.
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4.How is shipping managed for TLVH431ACDBVTE4?
TLVH431ACDBVTE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431ACDBVTE4 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 TLVH431ACDBVTE4?
For technical support, including TLVH431ACDBVTE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431ACDBVTE4 requirements.
6.How does Aetrix verify that TLVH431ACDBVTE4 is sourced from the original manufacturer or authorized distributors?
All TLVH431ACDBVTE4 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 TLVH431ACDBVTE4 meets industry standards.
7.What is the process for return or replacement of TLVH431ACDBVTE4?
All TLVH431ACDBVTE4 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431ACDBVTE4, 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 TLVH431ACDBVTE4 part is unused and in its original packaging.
Return procedure for TLVH431ACDBVTE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431ACDBVTE4 Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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