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Texas Instruments TLVH431BIPK
- Part No.:
- TLVH431BIPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH431BIPK.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,790
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Product details
Overview
TLVH431BIPK from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, delivering 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 100 μA minimum cathode current for regulation, and operation across –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH431BIPK datasheet, TLVH431BIPK pinout, TLVH431BIPK application, or TLVH431BIPK equivalent, key selection criteria include its 1.24 V low-voltage reference capability, ultra-low 0.25 Ω dynamic impedance, wide 1.24 V–18 V adjustable output range, and qualification for automotive-grade thermal range (–40°C to +125°C).
Technical Context
The TLVH431BIPK implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture enables closed-loop regulation via resistive feedback between cathode and reference pins, or open-loop comparator operation with direct input on the reference pin.
It operates with cathode-to-anode voltage as low as 1.24 V and supports continuous cathode current from 100 μA to 70 mA. The device is internally compensated for stability without external capacitors but maintains phase margin >36° up to 10 nF capacitive load at 5 V cathode voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - sets precise regulation threshold for feedback networks |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, enabling compatibility with 3.3 V/5 V/12 V rails |
| Dynamic Impedance | 0.25 Ω typical - ensures tight regulation under load transients and low-output-impedance Zener replacement |
| Cathode Current Range | 100 μA to 70 mA - supports low-power monitoring and higher-current shunt regulation without external boost |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance sensing |
| Thermal Stability (ΔVREF) | ±11 mV over full range (Q grade) - translates to <100 ppm/°C average TC for stable long-term accuracy |
Pinout & Package
SOT-89-3 package: 4.50 mm × 2.50 mm body, surface-mount, thermally enhanced with exposed tab connected to ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current sink input | Primary current path; connects to regulated rail or optocoupler LED anode in isolated supplies |
| REF (Pin 2) | Reference voltage sense input | High-impedance node (0.1–0.5 μA bias); connects to resistor divider midpoint for voltage feedback |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance return path; must be tied to system ground or power rail common point |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V cathode-to-anode - enables use in 1.8 V–3.3 V systems where TL431 fails |
| Ultra-low dynamic impedance | 0.25 Ω typical - reduces output voltage deviation under load steps, critical for precision SMPS feedback |
| Automotive temperature grade | –40°C to +125°C operation (Q grade) - validated for engine control units and ADAS power management |
| Integrated reference + amplifier | No external reference needed - simplifies comparator designs and eliminates matching drift in discrete solutions |
| Zener diode replacement | 100 μA min cathode current vs >1 mA for standard Zeners - cuts standby power in battery-backed monitors |
Applications
| Isolated Flyback SMPS Feedback | Voltage Monitoring for Power Rails |
|---|---|
|
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 against 1.24 V internal reference and drives optocoupler LED. Use Value: Enables regulation down to 2.7 V output (1.24 V + 1.4 V LED drop), supporting modern low-voltage DC/DC architectures. |
Use Scenario: Real-time detection of undervoltage/overvoltage conditions on 5 V or 12 V system rails. IC Role / Device Role / Timing Role: Comparator with built-in reference; REF pin biased by rail divider, CATHODE pulled high when threshold crossed. Use Value: Eliminates need for external reference IC and comparator, reducing BOM count and layout area in power sequencing circuits. |
| Adjustable Voltage Reference for ADCs | Zener Diode Replacement in Low-Power Circuits |
|
Use Scenario: Providing stable, user-adjustable reference voltage for SAR or delta-sigma ADCs in data acquisition modules. IC Role / Device Role / Timing Role: Precision shunt reference; configured with R1/R2 to set exact VREF (e.g., 2.5 V or 4.096 V) for ADC full-scale calibration. Use Value: 0.5% initial tolerance and <100 ppm/°C TC ensure measurement accuracy across temperature without trimming. |
Use Scenario: Replacing 3.3 V or 5.1 V Zener diodes in always-on voltage clamps or bias networks. IC Role / Device Role / Timing Role: Low-leakage shunt regulator; sinks current only when cathode voltage exceeds VREF × (1 + R1/R2). Use Value: Off-state cathode current ≤0.1 μA minimizes quiescent drain in battery-powered IoT sensors and backup circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431BIDBZR | SOT-23-3 package (2.92 mm × 1.30 mm); identical electrical specs and Q-grade temp range | Smaller footprint but lower thermal dissipation (RθJA = 206°C/W vs 52°C/W for PK); unsuitable for >300 mW continuous power | Select TLVH431BIDBZR only when board space is constrained and power dissipation remains <150 mW. |
| TLVH432BIPK | Same SOT-89-3 package but reversed pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE | Requires PCB layout revision; functionally identical but not pin-compatible - incompatible with existing TLVH431BIPK footprints | Choose TLVH432BIPK only for new designs where pinout flexibility is prioritized over drop-in replacement. |
Compared with TLVH431BIDBZR and TLVH432BIPK, the TLVH431BIPK offers optimal thermal performance in SOT-89 for medium-power shunt regulation, while avoiding both footprint limitations and pinout redesign overhead.
Availability
TLVH431BIPK is available at Aetrix Electronics and suitable for isolated SMPS feedback, power-rail monitoring, precision ADC references, and low-leakage Zener replacement requiring stable component supply across automotive, industrial, and telecom applications.
Supply support for TLVH431BIPK 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 and embedded processing technologies, with leadership in precision analog ICs and power management solutions.
The TLVH431 family was designed specifically for low-voltage, high-accuracy shunt regulation in space-constrained and thermally demanding applications such as automotive power supplies and isolated DC/DC converters.
FAQ
What is the reference voltage tolerance of TLVH431BIPK at 25°C?
The TLVH431BIPK 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 specification is confirmed in Section 5.7 of the TI SLVS555N datasheet and applies across all operating conditions within the Q-grade temperature range (–40°C to +125°C).
Can TLVH431BIPK operate with cathode voltage below 2.5 V?
Yes, TLVH431BIPK operates down to 1.24 V cathode-to-anode voltage - significantly lower than the 2.5 V minimum of TL431. This enables direct use in 1.8 V and 3.3 V systems. The device maintains regulation with ≥100 μA cathode current and stable output impedance even at 1.24 V, as verified in Figure 5-3 and Section 5.3 of the datasheet.
What is the maximum capacitive load TLVH431BIPK can drive while remaining stable?
TLVH431BIPK remains stable with up to 10 nF capacitive load at 5 V cathode voltage, as shown in Figure 5-17 of the datasheet. Phase margin stays above 36° across this range. For loads >1 nF, TI recommends verifying stability with actual circuit conditions; no external compensation is required for typical applications due to internal compensation.
How does TLVH431BIPK differ from TLVH432BIPK?
TLVH431BIPK and TLVH432BIPK share identical electrical specifications and SOT-89-3 packaging but differ in pinout: TLVH431BIPK uses Pin 1=CATHODE / Pin 2=REF / Pin 3=ANODE, whereas TLVH432BIPK uses Pin 1=REF / Pin 2=ANODE / Pin 3=CATHODE. They are not pin-compatible and require separate PCB layouts.
Is TLVH431BIPK suitable for automotive applications?
Yes, TLVH431BIPK is qualified for automotive applications per its Q-grade rating (–40°C to +125°C operating temperature), AEC-Q100 stress testing compliance, and specified performance across that full range. It is widely used in automotive isolated power supplies, battery management monitors, and engine control unit voltage references.
TLVH431BIPK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TLVH431BIPK FAQ
1.How can I place an order for TLVH431BIPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH431BIPK 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 TLVH431BIPK reliable?
The price and inventory of TLVH431BIPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH431BIPK is usually 5 days.
3.What payment methods are accepted for TLVH431BIPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH431BIPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH431BIPK?
TLVH431BIPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH431BIPK 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 TLVH431BIPK?
For technical support, including TLVH431BIPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH431BIPK requirements.
6.How does Aetrix verify that TLVH431BIPK is sourced from the original manufacturer or authorized distributors?
All TLVH431BIPK 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 TLVH431BIPK meets industry standards.
7.What is the process for return or replacement of TLVH431BIPK?
All TLVH431BIPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH431BIPK, 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 TLVH431BIPK part is unused and in its original packaging.
Return procedure for TLVH431BIPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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