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Texas Instruments TLVH431BILPRE3
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- Part No.:
- TLVH431BILPRE3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Datasheet:
-
TLVH431BILPRE3.pdf
- Description:
- IC VREF SHUNT PREC ADJ TO-92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
TLVH431BILPRE3 from Texas Instruments is a low-voltage adjustable precision shunt regulator with 0.5% reference voltage tolerance at 25°C, 1.24 V nominal reference voltage, and operation down to 1.24 V cathode-anode voltage. It delivers stable regulation across –40°C to +125°C, supports cathode currents from 100 μA to 70 mA, and features 0.25 Ω typical dynamic impedance-enabling use as a Zener replacement or error amplifier in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431BILPRE3 datasheet, TLVH431BILPRE3 pinout, TLVH431BILPRE3 application, or TLVH431BILPRE3 equivalent, key selection considerations include its B-grade 0.5% initial VREF accuracy, ultra-low minimum cathode current (100 μA), wide 1.24–18 V adjustable output range, thermal stability over automotive-grade temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH431BILPRE3 implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture forces the REF pin to 1.24 V relative to ANODE when sufficient cathode current (≥100 μA) flows and feedback is applied, enabling closed-loop voltage regulation via external resistor dividers.
It operates in two distinct functional modes: open-loop comparator mode (with integrated 1.24 V reference) for voltage monitoring, and closed-loop shunt regulator mode for precision feedback control. The device is internally compensated and stable without an output capacitor, though capacitive load stability margins are characterized up to 10 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF (25°C) | 1.24 V ±0.5% - ensures tight initial setpoint for adjustable references in power supply feedback or data converter biasing |
| Operating Temp Range | –40°C to +125°C - qualified for automotive under-hood and industrial embedded applications |
| Cathode Current Range | 100 μA to 70 mA - enables low-power monitoring and high-current shunt regulation without external gain stages |
| Dynamic Impedance | 0.25 Ω typical - provides sharp regulation knee and low output voltage drift under load transients |
| Min Cathode Voltage | 1.24 V - allows regulation in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 (2.5 V min) cannot operate |
| Reference Input Current | 0.1–0.5 μA - minimizes divider network loading and enables high-impedance feedback configurations |
| VREF/VKA Drift | –1.5 to –2.7 mV/V - quantifies reference voltage sensitivity to cathode voltage variation, critical for high-accuracy feedback design |
Pinout & Package
SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, gull-wing leads, JEDEC MO-178AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to ANODE; connects to optocoupler LED anode or feedback divider top node |
| 2: REF | Reference voltage sense input | High-impedance input (0.1–0.5 μA) tied to feedback divider midpoint; must not float; sets 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 |
Key Features
| Feature | Design Value |
|---|---|
| 0.5% VREF tolerance (B grade) | Enables ±0.62% output voltage accuracy in closed-loop configurations without trimming |
| 100 μA minimum cathode current | Supports ultra-low-power operation in battery-backed monitors and energy-harvesting systems |
| Stable without output capacitor | Reduces BOM count and PCB area in space-constrained designs; eliminates capacitor aging and ESR-related instability |
| Integrated 1.24 V reference + amplifier | Replaces discrete op-amp + Zener combos in comparator and error amplifier roles, cutting component count by ≥3 |
| –40°C to +125°C operation | Meets AEC-Q100 Grade 1 ambient temperature requirements for automotive powertrain and ADAS subsystems |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Providing precise, low-drift reference voltage for SAR or delta-sigma ADCs in industrial sensor nodes. IC Role / Device Role / Timing Role: Shunt regulator configured in closed loop to generate stable 2.048 V or 4.096 V reference from 3.3 V or 5 V rail using resistor divider. Use Value: 0.5% initial VREF tolerance and 0.25 Ω dynamic impedance limit reference error to <±0.1% over load and line variations. | Use Scenario: Isolated voltage feedback in 3.3 V/12 V dual-output flyback converters for telecom or industrial power supplies. IC Role / Device Role / Timing Role: Error amplifier and reference in optocoupler-coupled secondary-side feedback loop, regulating output via TLVH431BILPRE3–PC817 interface. Use Value: 1.24 V minimum operating voltage enables regulation of 2.7 V outputs-unachievable with TL431-while 100 μA IK(min) reduces standby losses. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 2.4 V or 3.3 V Zener diodes in on-board LDO biasing or voltage clamping circuits. IC Role / Device Role / Timing Role: Precision shunt element with active regulation, replacing passive Zener + series resistor networks. Use Value: 0.1–0.5 μA reference current and <0.1 V knee voltage variation eliminate Zener leakage and temperature drift issues in low-current bias rails. | Use Scenario: Monitoring 1.8 V core voltage in FPGA or microcontroller power domains for brownout detection. IC Role / Device Role / Timing Role: Open-loop comparator with integrated 1.24 V reference, comparing divided rail voltage against threshold. Use Value: Eliminates need for external reference IC; 100 μA cathode current enables direct drive of logic-level inputs or opto-LEDs without buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431AILPRE3 | 1% VREF tolerance at 25°C vs. 0.5% for TLVH431BILPRE3; otherwise identical electrical specs and pinout | Suitable where ±1% output accuracy suffices; lower cost for non-critical biasing or monitoring | Select TLVH431AILPRE3 when B-grade precision is unnecessary and cost optimization is prioritized |
| TLVH432BILPR | Same B-grade accuracy and specs, but SOT-23-3 pinout differs: REF and ANODE swapped (pin 1=REF, pin 3=ANODE) | Requires PCB layout change; used where alternate pinout eases routing near optocouplers or dense feedback nets | Choose TLVH432BILPR only if board layout constraints favor its pin assignment; not drop-in compatible |
Compared with TLVH431AILPRE3, TLVH431BILPRE3 delivers tighter initial accuracy for high-precision feedback, while TLVH432BILPR offers identical performance with a different pinout-requiring layout revision but no circuit redesign.
Availability
TLVH431BILPRE3 is available at Aetrix Electronics and suitable for industrial power supplies, automotive ADAS modules, and precision data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TLVH431BILPRE3 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 for industrial, automotive, and communications markets.
The TLVH431 family was designed as a low-voltage, high-accuracy upgrade to the TL431, targeting secondary-side regulation in 1.8–3.3 V isolated power supplies and precision voltage monitoring in harsh-temperature environments.
FAQ
What is the reference voltage tolerance of TLVH431BILPRE3 at 25°C?
The TLVH431BILPRE3 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 B-grade accuracy is specified in Section 5.7 of the TI SLVS555N datasheet and applies across all package variants including the SOT-23-3 (DBZ) form factor of TLVH431BILPRE3.
Can TLVH431BILPRE3 operate with cathode-to-anode voltages below 2.5 V?
Yes, TLVH431BILPRE3 operates down to 1.24 V cathode-to-anode voltage, making it suitable for 1.8 V and 2.5 V systems where the legacy TL431 (minimum 2.5 V) cannot function. Its low-voltage capability is enabled by a modified bandgap reference and Darlington output stage, as confirmed in the Functional Description section of the TLVH431BILPRE3 datasheet.
What is the minimum cathode current required for regulation in TLVH431BILPRE3?
The minimum cathode current required for regulation in TLVH431BILPRE3 is 100 μA at 25°C, with a maximum of 150 μA over the full –40°C to +125°C temperature range. This value is specified as IK(min) in Section 5.5–5.7 of the datasheet and is critical for ensuring sufficient open-loop gain in both shunt regulator and comparator modes.
Is TLVH431BILPRE3 stable without an output capacitor?
Yes, TLVH431BILPRE3 is internally compensated and stable without an output capacitor between cathode and anode. This is explicitly stated in Section 7.3 and validated in Figures 5-15 through 5-17 of the datasheet. However, if an output capacitor is used, stability margins depend on capacitive load value and cathode voltage, requiring selection per the provided phase margin curves.
How does the pinout of TLVH431BILPRE3 differ from TLVH432BILPR?
TLVH431BILPRE3 uses the standard SOT-23-3 (DBZ) pinout: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. TLVH432BILPR swaps REF and ANODE: Pin 1 = REF, Pin 2 = CATHODE, Pin 3 = ANODE. This difference is documented in Figures 4-4 and 4-5 of the TLVH431BILPRE3 datasheet and prevents direct PCB substitution without layout modification.
TLVH431BILPRE3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA) Formed Leads
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
TLVH431BILPRE3 FAQ
1.How can I place an order for TLVH431BILPRE3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BILPRE3 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 TLVH431BILPRE3 reliable?
The price and inventory of TLVH431BILPRE3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BILPRE3 is usually 5 days.
3.What payment methods are accepted for TLVH431BILPRE3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BILPRE3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431BILPRE3?
TLVH431BILPRE3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BILPRE3 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 TLVH431BILPRE3?
For technical support, including TLVH431BILPRE3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BILPRE3 requirements.
6.How does Aetrix verify that TLVH431BILPRE3 is sourced from the original manufacturer or authorized distributors?
All TLVH431BILPRE3 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 TLVH431BILPRE3 meets industry standards.
7.What is the process for return or replacement of TLVH431BILPRE3?
All TLVH431BILPRE3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BILPRE3, 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 TLVH431BILPRE3 part is unused and in its original packaging.
Return procedure for TLVH431BILPRE3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH431BILPRE3 Tags
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TL431AIDBZR
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TL431BQDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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