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Texas Instruments TLVH432QPK
- Part No.:
- TLVH432QPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432QPK.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,998
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Product details
Overview
TLVH432QPK 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 (B-grade), 0.25 Ω typical dynamic impedance, and operation from –40°C to +125°C. It functions as a programmable voltage reference or comparator in isolated flyback SMPS feedback loops, secondary-side regulation, and low-leakage Zener replacement circuits.
For engineers reviewing the TLVH432QPK datasheet, TLVH432QPK pinout, TLVH432QPK application, or TLVH432QPK equivalent, key selection criteria include cathode current range (100 μA to 70 mA), reference voltage temperature stability (±31 mV over –40°C to +125°C), output voltage adjustability (1.24 V to 18 V), and SOT-89 thermal performance (RθJA = 52°C/W).
Technical Context
The TLVH432QPK implements a precision bandgap reference with high-gain error amplifier and Darlington sink output stage. Its internal architecture enables stable closed-loop shunt regulation when feedback is applied between cathode and reference pins, or open-loop comparator operation with integrated 1.24 V threshold.
Unlike the TLVH431, the TLVH432QPK uses reversed pinout in SOT-89: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - enabling direct compatibility with optocoupler-based feedback networks where cathode connects to LED anode and reference ties to divider node.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 1.24 V ±0.5% at 25°C - sets minimum programmable output voltage and defines accuracy of regulated rail or comparator trip point. |
| VOUT Range | 1.24 V to 18 V - adjustable via two external resistors; supports 3.3 V/5 V/12 V SMPS outputs without external op-amp. |
| IK Range | 100 μA to 70 mA - enables regulation at ultra-low bias currents (e.g., standby mode) and robust load handling (e.g., optocoupler drive). |
| |zKA| | 0.25 Ω typical - ensures tight voltage regulation under dynamic load steps; critical for stable feedback in isolated converters. |
| TA Range | –40°C to +125°C - qualified for automotive under-hood and industrial control applications requiring extended temperature reliability. |
| IREF | 0.1–0.5 μA - ultra-low reference pin current minimizes divider network error and power loss in high-impedance feedback paths. |
| VKA(max) | 20 V absolute max - defines maximum cathode-to-anode voltage stress; supports 18 V regulated output with 2 V margin. |
Pinout & Package
SOT-89-3 package (4.50 mm × 2.50 mm body), surface-mount, thermally enhanced with exposed pad (not electrically connected). Designed for high-power-density PCB layouts and improved heat dissipation vs. SOT-23.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - CATHODE | Current sink input | Primary current path into device; connects to SMPS output or optocoupler LED anode; carries full regulation current. |
| 2 - ANODE | Common return node | Typically tied to system ground or power rail return; serves as voltage reference point for cathode and reference terminals. |
| 3 - REF | Feedback sense input | Monitors voltage divider output; forces cathode voltage to maintain VREF × (1 + R1/R2); requires ≥0.1 μA bias current. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Operates down to 1.24 V cathode-anode differential - enables regulation in 1.8 V, 2.5 V, and 3.3 V systems where legacy TL431 fails. |
| B-grade precision | ±0.5% VREF tolerance at 25°C - reduces output voltage error in precision power supplies without trimming. |
| Wide cathode current range | 100 μA minimum regulation current - supports energy-efficient standby modes and low-power sensor interfaces. |
| Stable without output capacitor | Internally compensated - eliminates need for external cathode-to-anode capacitor in most feedback designs, simplifying layout. |
| High-temperature qualification | Specified from –40°C to +125°C - meets AEC-Q100 Grade 1 requirements for automotive powertrain and body electronics. |
Applications
| Isolated Flyback SMPS Feedback | Zener Diode Replacement |
|---|---|
Use Scenario: Secondary-side voltage sensing in 3.3 V/5 V isolated DC-DC converters using optocoupler feedback to primary controller. IC Role / Device Role / Timing Role: Adjustable shunt regulator and error amplifier - compares divided output voltage against internal 1.24 V reference and sinks cathode current to modulate optocoupler LED brightness. Use Value: Enables <2.7 V regulated output (1.24 V + opto VF) and improves transient response vs. discrete Zener + op-amp solutions. | Use Scenario: Precision voltage clamping or rail monitoring in battery-powered IoT nodes and portable medical devices. IC Role / Device Role / Timing Role: Low-leakage programmable shunt reference - replaces 1N47xx Zeners with 100× lower IOFF (0.02 μA vs. >1 μA) and tighter VZ tolerance. Use Value: Reduces quiescent current by >95% in always-on monitoring circuits while maintaining ±1% output accuracy over temperature. |
| Voltage Monitoring for Power Rails | Comparator with Integrated Reference |
Use Scenario: Real-time detection of brownout or overvoltage on FPGA core rails (e.g., 1.0 V, 1.2 V) in industrial PLCs. IC Role / Device Role / Timing Role: Threshold detector - configured open-loop with REF tied to monitored rail and CATHODE pulled up to enable signal assertion at precise VREF. Use Value: Eliminates external reference IC and resistor divider, reducing BOM count and improving trip-point repeatability across –40°C to +125°C. | Use Scenario: Level-shifting and logic-level translation between 3.3 V microcontroller GPIO and 5 V analog sensor outputs. IC Role / Device Role / Timing Role: Single-supply comparator - uses internal 1.24 V reference to compare input against fixed threshold without external components. Use Value: Achieves <1 μs propagation delay with rail-to-rail output swing, enabling fast fault detection in motor control safety circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431QPK | Different pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE - incompatible without PCB redesign. | Same electrical specs but reverse pin assignment; unsuitable for drop-in replacement in TLVH432QPK layouts. | Select TLVH431QPK only when redesigning feedback network to route reference signal to Pin 1. |
| TLVH432BPK | Same pinout and package; differs only in grade - B-grade (±0.5%) vs. Q-grade (–40°C to +125°C temp range). | TLVH432BPK rated for 0°C to 70°C only; not suitable for automotive or extended-temp industrial use. | Choose TLVH432BPK for commercial-grade cost-sensitive applications where ambient temperature stays below 70°C. |
Compared with TLVH431QPK and TLVH432BPK, TLVH432QPK uniquely combines automotive-grade temperature range (–40°C to +125°C) with TLVH432-specific SOT-89 pinout - making it the only option for drop-in replacement in existing high-reliability flyback designs requiring both extended temperature operation and optocoupler-compatible terminal mapping.
Availability
TLVH432QPK is available at Aetrix Electronics and suitable for isolated SMPS feedback, precision voltage monitoring, and low-leakage Zener replacement applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432QPK 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 leader specializing in analog, embedded processing, and power management technologies with over 90 years of innovation in precision analog ICs.
The TLVH432 product line delivers low-voltage, high-accuracy shunt references optimized for isolated power supply feedback, battery monitoring, and comparator applications demanding tight tolerance and wide temperature operation.
FAQ
What is the exact pin configuration of TLVH432QPK in the SOT-89 package?
TLVH432QPK uses Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - confirmed in Figure 4-7 of the official datasheet. This reversed pinout versus TLVH431 enables direct connection to optocoupler anodes in isolated feedback topologies without signal inversion or board rework.
Does TLVH432QPK require an external capacitor for stability in shunt regulator mode?
No, TLVH432QPK is internally compensated and remains stable without an external cathode-to-anode capacitor in standard configurations. However, if capacitive loading exceeds 1 nF, consult Figures 5-15 to 5-17 in the TLVH432QPK datasheet to select a series resistor that maintains phase margin above 45°.
What is the minimum cathode current required for regulation across temperature for TLVH432QPK?
TLVH432QPK specifies IK(min) = 100 μA maximum at 25°C, with typical value of 60 μA. Over the full –40°C to +125°C range, the worst-case minimum cathode current remains ≤100 μA - verified in Figure 5-5 and Section 5.5 of the TLVH432QPK datasheet.
How does the reference voltage tolerance of TLVH432QPK compare to TLVH431QPK?
TLVH432QPK and TLVH431QPK share identical reference voltage specifications: 1.24 V ±0.5% at 25°C for B-grade, ±1% for A-grade, and ±1.5% for standard grade. The "Q" suffix denotes the same –40°C to +125°C temperature qualification for both parts.
Can TLVH432QPK be used as a standalone comparator without external resistors?
Yes - when configured open-loop with ANODE grounded, REF tied to input signal, and CATHODE pulled up to VCC, TLVH432QPK acts as a comparator with built-in 1.24 V threshold. Output swings rail-to-rail, and propagation delay is <1 μs per Figure 5-12 in the TLVH432QPK datasheet.
TLVH432QPK 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TLVH432QPK FAQ
1.How can I place an order for TLVH432QPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432QPK 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 TLVH432QPK reliable?
The price and inventory of TLVH432QPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432QPK is usually 5 days.
3.What payment methods are accepted for TLVH432QPK?
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4.How is shipping managed for TLVH432QPK?
TLVH432QPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432QPK 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 TLVH432QPK?
For technical support, including TLVH432QPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432QPK requirements.
6.How does Aetrix verify that TLVH432QPK is sourced from the original manufacturer or authorized distributors?
All TLVH432QPK 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 TLVH432QPK meets industry standards.
7.What is the process for return or replacement of TLVH432QPK?
All TLVH432QPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432QPK, 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 TLVH432QPK part is unused and in its original packaging.
Return procedure for TLVH432QPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432QPK Tags
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