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Texas Instruments TLVH432IPK
- Part No.:
- TLVH432IPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432IPK.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,824
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Product details
Overview
TLVH432IPK 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 (B-grade), 100 μA minimum cathode current for regulation, 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 engineers reviewing the TLVH432IPK datasheet, TLVH432IPK pinout, TLVH432IPK application, or TLVH432IPK equivalent, key selection criteria include reference accuracy at temperature extremes, cathode current headroom in low-power designs, stability with capacitive loads, and pinout compatibility in SOT-89-based power supply layouts.
Technical Context
The TLVH432IPK implements a three-terminal shunt-regulator architecture with internal 1.24 V bandgap reference and high-gain transconductance amplifier driving a Darlington output stage. Its open-loop comparator mode enables precise voltage monitoring without external reference components.
In closed-loop configuration, it functions as a programmable shunt regulator where output voltage is set between 1.24 V and 18 V using two external resistors. The device achieves stable regulation with no mandatory output capacitor, though phase margin vs. capacitive load curves guide compensation design for >10 nF loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - sets minimum programmable output and defines accuracy baseline for feedback networks |
| Output Voltage Range | 1.24 V to 18 V - achieved via resistor divider from cathode to reference pin, enabling wide-range adjustable regulation |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power biasing while maintaining regulation and enables high-current shunt applications |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions in feedback circuits |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control environments requiring extended thermal range |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and enables high-impedance feedback networks |
| Thermal Resistance | 52 °C/W (junction-to-ambient) - allows 1.2 W max power dissipation at 85°C ambient in standard PCB layout |
Pinout & Package
SOT-89-3 package: 4.50 mm × 2.50 mm body, 1.0 mm nominal height, gull-wing leads, thermal pad on underside for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary current path for regulation; connects to feedback network output or optocoupler LED anode in isolated supplies |
| REF (Pin 2) | Reference input / threshold sense | High-impedance input sensing voltage divider output; must be biased with ≥0.1 μA to maintain regulation |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance return path for cathode and reference currents; connects to system ground or negative rail |
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 cannot function |
| Sharp turn-on characteristic | High open-loop gain with Darlington output - provides clean switching behavior in comparator mode for voltage monitoring |
| No external capacitor required | Internally compensated - eliminates need for output capacitor in most shunt regulator configurations, reducing BOM count |
| Ultra-low reference current | 0.1–0.5 μA - permits use of MΩ-range feedback resistors, minimizing quiescent current in battery-powered designs |
| Grade-selectable accuracy | B-grade (±0.5%) - delivers high-precision regulation for data converter references and closed-loop power supply feedback |
Applications
| Secondary-Side Regulation in Flyback SMPS | Zener Diode Replacement |
|---|---|
Use Scenario: Used with optocoupler in isolated 3.3 V flyback converter to regulate output voltage on secondary side. IC Role / Device Role / Timing Role: Acts as error amplifier and precision reference, comparing sampled output voltage against internal 1.24 V reference. Use Value: Enables regulation as low as 2.7 V output (1.24 V + optocoupler VF), supporting modern low-voltage rails with <±1% accuracy over –40°C to +125°C. | Use Scenario: Replaces discrete Zener diodes in on-board voltage clamping and rail monitoring circuits. IC Role / Device Role / Timing Role: Functions as programmable shunt regulator with sharp knee and low leakage (<0.1 μA off-state). Use Value: Reduces leakage current by >90% versus 3.3 V Zener diodes, improving standby efficiency in always-on subsystems. |
| Voltage Monitoring for Power Rails | Adjustable Reference for Data Converters |
Use Scenario: Monitors 5 V or 12 V system rails for undervoltage lockout or fault detection in industrial controllers. IC Role / Device Role / Timing Role: Operates in open-loop comparator mode, triggering reset or alert when rail drops below programmed threshold. Use Value: Integrates reference and comparator in one device, eliminating external precision reference and reducing component count by 2–3 parts. | Use Scenario: Provides stable, adjustable reference voltage for SAR or delta-sigma ADCs in test equipment and sensor interfaces. IC Role / Device Role / Timing Role: Supplies low-noise, thermally stable reference to ADC REF+ pin via resistor divider. Use Value: Delivers ±0.5% initial accuracy and <31 mV total drift over –40°C to +125°C, directly improving ADC effective resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431IPK | Identical electrical specs but SOT-89 pinout: REF–ANODE–CATHODE (vs. TLVH432IPK's CATHODE–REF–ANODE) | Requires PCB layout revision due to reversed pin assignment; not drop-in compatible | Select TLVH431IPK only when redesigning layout to match its pinout or when sourcing legacy designs originally specified with TLVH431IPK |
| TLV431BIDBVR | SC70-5 package; 1.24 V reference, ±0.5%, but 1.5 mA min cathode current and higher 0.5 Ω impedance | Higher minimum current limits use in ultra-low-power systems; SC70 footprint incompatible with SOT-89 | Choose TLV431BIDBVR only for space-constrained designs where SOT-89 is unavailable and 1.5 mA cathode current is acceptable |
Compared with TLVH431IPK, TLVH432IPK offers inverted pinout for improved routing in optocoupler-coupled feedback paths; compared with TLV431BIDBVR, it delivers lower minimum cathode current and superior dynamic impedance, making it preferable for high-accuracy, low-quiescent-power shunt regulation.
Availability
TLVH432IPK is available at Aetrix Electronics and suitable for isolated flyback SMPS, voltage monitoring systems, and precision data converter references requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432IPK 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 TLVH432IPK belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback in isolated power supplies and voltage supervision circuits.
FAQ
What is the pin configuration of TLVH432IPK?
The TLVH432IPK uses a SOT-89-3 package with pin 1 = CATHODE, pin 2 = REF, and pin 3 = ANODE. This pinout differs from TLVH431IPK (REF–ANODE–CATHODE) and is optimized for direct connection to optocoupler anodes in isolated feedback topologies. Always verify pinout against TI's SLVS555N datasheet Figure 4-7 before PCB layout.
Does TLVH432IPK require an output capacitor for stability?
No, TLVH432IPK is internally compensated and operates stably without an output capacitor between cathode and anode. However, if a capacitive load >10 nF is used, consult Figures 5-15 through 5-17 in the TLVH432IPK datasheet to select a series resistor that maintains ≥45° phase margin across operating conditions.
What is the minimum cathode current needed for regulation in TLVH432IPK?
The TLVH432IPK requires a minimum cathode current of 100 μA to maintain regulation across its full temperature range (–40°C to +125°C). At 25°C, regulation is guaranteed down to 60 μA, but design margins should target 100 μA to ensure robust performance in automotive and industrial applications.
Can TLVH432IPK replace a Zener diode in voltage clamp circuits?
Yes, TLVH432IPK replaces Zener diodes with superior performance: it offers ±0.5% reference accuracy (vs. ±5% typical for Zeners), <0.1 μA off-state current (vs. >1 μA for most Zeners), and 0.25 Ω dynamic impedance (vs. 5–50 Ω for Zeners). Its sharp turn-on also improves transient response in overvoltage protection circuits.
How does TLVH432IPK differ from TLVH431IPK?
TLVH432IPK and TLVH431IPK share identical electrical specifications but differ in SOT-89 pinout: TLVH432IPK is CATHODE–REF–ANODE, while TLVH431IPK is REF–ANODE–CATHODE. This inversion simplifies routing in optocoupler-based feedback paths but makes them non-interchangeable without PCB modification.
TLVH432IPK 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:
- ±1.5%
- 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
TLVH432IPK FAQ
1.How can I place an order for TLVH432IPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432IPK 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 TLVH432IPK reliable?
The price and inventory of TLVH432IPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432IPK is usually 5 days.
3.What payment methods are accepted for TLVH432IPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432IPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432IPK?
TLVH432IPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432IPK 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 TLVH432IPK?
For technical support, including TLVH432IPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432IPK requirements.
6.How does Aetrix verify that TLVH432IPK is sourced from the original manufacturer or authorized distributors?
All TLVH432IPK 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 TLVH432IPK meets industry standards.
7.What is the process for return or replacement of TLVH432IPK?
All TLVH432IPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432IPK, 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 TLVH432IPK part is unused and in its original packaging.
Return procedure for TLVH432IPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432IPK Tags
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