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Texas Instruments TLVH432CPK
- Part No.:
- TLVH432CPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432CPK.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,953
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Product details
Overview
TLVH432CPK from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, featuring 1.24 V reference voltage (±1.5% at 25°C), 100 μA to 70 mA cathode current range, 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 TLVH432CPK datasheet, TLVH432CPK pinout, TLVH432CPK application, or TLVH432CPK equivalent, key selection criteria include its 1.24 V minimum regulation voltage, SOT-89 pin configuration (CATHODE–REF–ANODE), thermal stability across automotive-grade temperature range, and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432CPK implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation via external resistor divider between CATHODE and REF pins. Its internal 1.24 V reference is stable over –40°C to +125°C with <31 mV total deviation for Q-grade variants.
Unlike the TLVH431, the TLVH432CPK uses reversed pinout in SOT-89: Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE - enabling direct integration into compact power supply layouts where cathode-to-ground routing is preferred. It operates without external compensation under capacitive loads ≤1 nF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1.5% at 25°C; sets minimum adjustable output voltage in shunt regulator configurations |
| Cathode Current Range | 100 μA to 70 mA; supports low-power monitoring and high-current regulation without external boost |
| Dynamic Impedance | 0.25 Ω typical; ensures tight voltage regulation under load transients in feedback loops |
| Operating Temperature | –40°C to +125°C; qualified for automotive under-hood and industrial control applications |
| Output Voltage Range | VREF to 18 V; adjustable via two external resistors, enabling flexible rail monitoring and regulation |
| Reference Input Current | 0.1–0.5 μA; enables high-impedance feedback networks with minimal loading error |
| Off-State Cathode Current | 0.02–0.1 μA at VKA = 18 V; ensures low leakage during system standby or fault conditions |
Pinout & Package
SOT-89-3 package: 4.50 mm × 2.50 mm body, 1.0 mm max height, gull-wing leads, thermal pad on underside for PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current input / output node | Connects to regulated rail or optocoupler LED anode; sinks current to maintain reference voltage at REF |
| 2: REF | Reference input threshold node | Compares against internal 1.24 V bandgap; requires ≥0.1 μA bias current and must not float |
| 3: ANODE | Common return / ground reference | Typically connected to system ground; forms return path for cathode current and reference bias |
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 TL431 cannot function |
| Ultra-low reference current | 0.1–0.5 μA REF pin current - permits >10 MΩ feedback dividers without accuracy loss |
| High-temperature grade | Specified from –40°C to +125°C - suitable for automotive engine control units and industrial motor drives |
| Stable without output capacitor | No mandatory cathode-to-anode capacitor - simplifies layout and improves reliability in space-constrained designs |
| Reversed SOT-89 pinout | CATHODE–REF–ANODE arrangement - optimizes PCB routing for flyback feedback paths with minimal trace inductance |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary Side Regulation in Flyback SMPSs |
|---|---|
Use Scenario: Provides stable reference for 12–16-bit SAR and delta-sigma ADCs in battery-powered sensors. IC Role / Device Role / Timing Role: Precision shunt reference establishing VREF for analog front-end scaling. Use Value: 1.5% initial tolerance and <31 mV full-range drift ensure <0.02% gain error contribution across temperature. |
Use Scenario: Error amplifier in isolated 3.3 V/5 V flyback converters using PC817 or SFH615A optocouplers. IC Role / Device Role / Timing Role: Closed-loop shunt regulator comparing optocoupler feedback voltage to internal 1.24 V reference. Use Value: 0.25 Ω dynamic impedance maintains <1% output voltage deviation under 50% load steps. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replaces 2.4 V–12 V Zener diodes in LDO bias networks and microcontroller reset circuits. IC Role / Device Role / Timing Role: Adjustable shunt clamp with sharp turn-on characteristic and sub-μA leakage. Use Value: 0.02–0.1 μA off-state cathode current reduces standby power by >95% versus standard Zeners. |
Use Scenario: Monitors 1.8 V core rail in FPGA or SoC power sequencing with programmable undervoltage lockout. IC Role / Device Role / Timing Role: Open-loop comparator comparing rail voltage to scaled reference at REF pin. Use Value: 100 μA minimum cathode current enables reliable detection even with weak pull-up sources. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432IPK | Same SOT-89-3 package and pinout; tighter 1% reference tolerance (A-grade) at 25°C | Better suited for precision feedback loops requiring <10 mV absolute reference error | Select TLVH432IPK when system-level accuracy demands tighter initial VREF tolerance without changing layout |
| TLVH432BPK | Same SOT-89-3 package and pinout; 0.5% reference tolerance (B-grade) at 25°C | Used in high-reliability industrial instrumentation where long-term drift must be minimized | Choose TLVH432BPK only if calibration budget allows for highest-grade reference and cost premium is justified |
Compared with TLVH432CPK, TLVH432IPK offers improved initial accuracy but identical thermal drift and dynamic impedance, while TLVH432BPK delivers lowest VREF uncertainty at 25°C but requires validation of long-term stability in mission-critical applications.
Availability
TLVH432CPK is available at Aetrix Electronics and suitable for automotive power management, industrial SMPS design, and precision analog monitoring requiring stable component supply across extended temperature ranges.
Supply support for TLVH432CPK 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 TLVH432CPK belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback in isolated and non-isolated DC/DC converters, voltage monitors, and reference replacement applications.
FAQ
What is the exact pin configuration of TLVH432CPK in the SOT-89 package?
The TLVH432CPK uses a CATHODE–REF–ANODE pinout in SOT-89-3: Pin 1 is CATHODE, Pin 2 is REF, and Pin 3 is ANODE. This differs from TLVH431PK (REF–ANODE–CATHODE) and is confirmed in Figure 4-7 of the SLVS555N datasheet. Correct orientation is critical for functional feedback loop implementation.
Does TLVH432CPK require an output capacitor for stability?
No, TLVH432CPK is internally compensated and remains stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is added for noise filtering, Figures 5-15 through 5-17 in the datasheet specify maximum allowable values (≤1 nF at VKA = 1.25 V) to avoid phase margin degradation.
What is the minimum cathode current required for regulation in TLVH432CPK?
The TLVH432CPK requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 of the datasheet. Below this threshold, open-loop gain drops significantly, causing poor reference tracking and potential instability in closed-loop configurations.
Can TLVH432CPK replace a standard Zener diode directly?
Yes, TLVH432CPK can directly replace Zener diodes rated from 1.24 V to 18 V. Its advantages include lower leakage (0.02–0.1 μA vs. 1–10 μA for Zeners), sharper knee voltage, and adjustable output via external resistors - all without requiring changes to existing SOT-89 footprint.
What temperature range is TLVH432CPK qualified for?
TLVH432CPK is qualified for operation from –40°C to +125°C (Q-grade), with electrical characteristics fully specified across this range. The "C" suffix denotes the commercial-grade version, but the PK package variant is tested and guaranteed for the full automotive temperature range per datasheet Section 5.3.
TLVH432CPK 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:
- ±1.5%
- 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-89-3
TLVH432CPK FAQ
1.How can I place an order for TLVH432CPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432CPK 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 TLVH432CPK reliable?
The price and inventory of TLVH432CPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432CPK is usually 5 days.
3.What payment methods are accepted for TLVH432CPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432CPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432CPK?
TLVH432CPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432CPK 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 TLVH432CPK?
For technical support, including TLVH432CPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432CPK requirements.
6.How does Aetrix verify that TLVH432CPK is sourced from the original manufacturer or authorized distributors?
All TLVH432CPK 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 TLVH432CPK meets industry standards.
7.What is the process for return or replacement of TLVH432CPK?
All TLVH432CPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432CPK, 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 TLVH432CPK part is unused and in its original packaging.
Return procedure for TLVH432CPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432CPK Tags
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TL431AIDBZR
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TL431BQDBZR
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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