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Texas Instruments TLVH432BIPK
- Part No.:
- TLVH432BIPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432BIPK.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,319
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Product details
Overview
TLVH432BIPK from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, providing 1.24 V reference voltage with ±0.5% initial tolerance at 25°C, 0.25 Ω typical dynamic impedance, and operation from 1.24 V to 18 V output range. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops requiring tight regulation below 3.3 V.
For engineers reviewing the TLVH432BIPK datasheet, TLVH432BIPK pinout, TLVH432BIPK application, or TLVH432BIPK equivalent, key selection criteria include cathode current range (100 μA–70 mA), thermal stability over –40°C to +125°C, ultra-low reference input current (0.1–0.5 μA), and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432BIPK 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 divider feedback between cathode and reference pins, or open-loop comparator operation with integrated 1.24 V threshold.
Unlike the TLVH431, the TLVH432BIPK uses reversed pinout in SOT-89: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - enabling direct replacement in layouts where anode-grounded configurations simplify PCB routing and reduce parasitic inductance in high-frequency SMPS feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets precise regulation point for feedback networks without external trimming |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, supporting 3.3 V, 5 V, and 12 V rail monitoring and regulation |
| Cathode Current Range | 100 μA to 70 mA - enables stable operation in low-power sensing and high-current shunt applications |
| Dynamic Impedance | 0.25 Ω typical - ensures minimal output voltage deviation under load transients in error amplifier configurations |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments |
| Reference Input Current | 0.1–0.5 μA - reduces resistor-divider power loss and improves accuracy in high-impedance feedback networks |
| VKA vs VREF Drift | –1.5 to –2.7 mV/V - quantifies cathode voltage sensitivity, critical for stability analysis in capacitive-load compensation |
Pinout & Package
SOT-89-3 package (4.50 mm × 2.50 mm), surface-mount, thermally enhanced with exposed pad (not electrically connected); pin 2 (ANODE) serves as common ground reference and thermal path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CATHODE | Shunt current sink input | Connects to regulated output node; sinks current to maintain VREF at pin 3 when feedback loop is closed |
| 2 - ANODE | Common return / ground reference | Must be connected to system ground; provides thermal conduction path and defines voltage reference for VREF |
| 3 - REF | Internal reference sense input | Monitors voltage divider output; forces cathode current to regulate external voltage to 1.24 V × (1 + R1/R2) |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation at 1.24 V - enables use in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 cannot function |
| Ultra-low reference current | 0.1–0.5 μA - permits >1 MΩ feedback dividers, minimizing standby power and noise coupling in battery-powered designs |
| Sharp turn-on characteristic | High open-loop gain (>80 dB) - delivers fast response in overvoltage detection and comparator-mode rail monitoring |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode bypass cap in most SMPS feedback designs |
| Grade-B precision | ±0.5% VREF tolerance - reduces calibration overhead in factory-programmed power supplies and data converter references |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
|
Use Scenario: Provides stable reference for 12–16-bit SAR and delta-sigma ADCs in portable instrumentation. IC Role / Device Role / Timing Role: Precision shunt reference sourcing <1 μA into ADC REF pin while rejecting supply ripple. Use Value: Enables ±0.5 LSB integral nonlinearity by maintaining 1.24 V ±6.2 mV across –40°C to +125°C without trimming. |
Use Scenario: Regulates 3.3 V output in isolated AC/DC adapter using PC817 optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier comparing sampled output to 1.24 V reference, driving optocoupler LED. Use Value: Achieves <±1% output regulation with 100 μA minimum cathode current, enabling efficient light-load performance. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
|
Use Scenario: Replaces 2.4 V Zener in FPGA core voltage supervisor circuit with lower leakage and tighter tolerance. IC Role / Device Role / Timing Role: Adjustable shunt clamp activated when rail exceeds threshold set by R1/R2 divider. Use Value: Reduces off-state cathode current to 0.02–0.1 μA (vs 5–50 μA for Zeners), cutting quiescent power by >95%. |
Use Scenario: Monitors 5 V USB-C PD port voltage for overvoltage lockout in embedded host controllers. IC Role / Device Role / Timing Role: Comparator with integrated 1.24 V reference detecting >5.5 V via resistive scaling. Use Value: Eliminates external reference IC; responds within 1 μs to overvoltage events due to high open-loop gain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432BIDBZR | SOT-23-3 package, same B-grade tolerance and electrical specs; pinout: Pin 1=REF, Pin 2=ANODE, Pin 3=CATHODE | Smaller footprint (2.92 mm × 1.30 mm) but higher thermal resistance (206°C/W vs 52°C/W), limiting >30 mA continuous use | Select for space-constrained boards where thermal load is low and layout supports reversed SOT-23 pin mapping |
| TLVH431BIPK | Identical SOT-89-3 package and thermal performance, but TLVH431 variant has standard pinout: Pin 1=REF, Pin 2=ANODE, Pin 3=CATHODE | Requires PCB trace re-routing to match TLVH432BIPK's reversed cathode/anode placement; identical regulation behavior otherwise | Select when existing layout uses TLVH431 pinout and redesign is impractical; verify feedback polarity during validation |
Compared with TLVH432BIDBZR and TLVH431BIPK, the TLVH432BIPK uniquely combines SOT-89 thermal robustness with cathode-first pinout - simplifying high-current feedback routing and reducing ground bounce in noisy SMPS environments.
Availability
TLVH432BIPK is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and medical sensor interfaces requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for TLVH432BIPK 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 TLVH432BIPK belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback in isolated power conversion, data acquisition, and system supervision applications.
FAQ
What is the maximum cathode voltage rating for TLVH432BIPK?
The TLVH432BIPK has an absolute maximum cathode-to-anode voltage (VKA) of 20 V. Operating beyond this risks permanent damage. For reliable long-term use, the recommended maximum is 18 V per the datasheet's operating conditions - aligning with its adjustable output range and ensuring margin against transient spikes in SMPS applications.
Does TLVH432BIPK require an external capacitor for stability?
No, TLVH432BIPK is internally compensated and remains stable without an output capacitor between cathode and anode under typical conditions. However, if a capacitive load is present (e.g., optocoupler CTR variation or long PCB traces), Figures 5-15–5-17 in the datasheet provide phase-margin guidance for selecting ≤1 nF ceramic capacitors to maintain ≥45° phase margin.
How does the TLVH432BIPK pinout differ from TLVH431BIPK?
TLVH432BIPK uses reversed SOT-89 pinout: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF. TLVH431BIPK uses standard order: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This reversal allows direct cathode connection to high-side nodes without crossing traces, improving layout efficiency in flyback feedback paths.
Can TLVH432BIPK operate with cathode current below 100 µA?
TLVH432BIPK specifies 100 µA as the minimum cathode current (IK(min)) for guaranteed regulation. Below this, gain drops significantly - causing poor line/load regulation and delayed response. While it may conduct at 60 µA (typical min), design margins require ≥100 µA across –40°C to +125°C per Section 5.5 of the datasheet.
What is the reference input current (Iref) specification for TLVH432BIPK?
TLVH432BIPK exhibits reference input current (Iref) of 0.1–0.5 μA at 25°C, with full-temperature deviation up to 0.5 μA for Q-grade devices. This ultra-low value minimizes divider resistor self-heating and enables high-impedance feedback networks essential for low-power IoT sensors and battery-backed systems.
TLVH432BIPK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-243AA
- 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:
- ±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
TLVH432BIPK FAQ
1.How can I place an order for TLVH432BIPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432BIPK 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 TLVH432BIPK reliable?
The price and inventory of TLVH432BIPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432BIPK is usually 5 days.
3.What payment methods are accepted for TLVH432BIPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432BIPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432BIPK?
TLVH432BIPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432BIPK 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 TLVH432BIPK?
For technical support, including TLVH432BIPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432BIPK requirements.
6.How does Aetrix verify that TLVH432BIPK is sourced from the original manufacturer or authorized distributors?
All TLVH432BIPK 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 TLVH432BIPK meets industry standards.
7.What is the process for return or replacement of TLVH432BIPK?
All TLVH432BIPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432BIPK, 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 TLVH432BIPK part is unused and in its original packaging.
Return procedure for TLVH432BIPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432BIPK Tags
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