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Texas Instruments TLVH432AQPKG3
- Part No.:
- TLVH432AQPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432AQPKG3.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,938
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Product details
Overview
TLVH432AQPKG3 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, 100 μA to 70 mA cathode current range, and operation from –40°C to +125°C. It functions as an error amplifier or voltage reference in isolated flyback SMPS feedback loops, replacing Zener diodes with lower leakage and sharper turn-on.
For engineers reviewing the TLVH432AQPKG3 datasheet, TLVH432AQPKG3 pinout, TLVH432AQPKG3 application, or TLVH432AQPKG3 equivalent, key selection criteria include reference accuracy grade (Q-grade for automotive temp range), SOT-89 pin configuration (CATHODE–REF–ANODE), dynamic impedance (0.25 Ω), and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432AQPKG3 implements a bandgap-referenced error amplifier with Darlington output stage, enabling precise shunt regulation down to 1.24 V while maintaining stability without external compensation. Its open-loop comparator mode supports voltage monitoring, while closed-loop operation with resistive feedback sets output from VREF to 18 V.
Unlike the TLVH431, the TLVH432AQPKG3 uses reversed pinout in SOT-89 (Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE), optimizing PCB layout for high-side sensing in isolated power supplies. It delivers 0.25 Ω typical dynamic impedance and <0.5 μA reference input current across –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C - enables accurate low-voltage regulation starting at 1.24 V, critical for 3.3 V and 2.5 V system rails. |
| Cathode Current Range | 100 μA to 70 mA - supports ultra-low-power monitoring and high-current shunt regulation without external boost. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control applications requiring extended thermal robustness. |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load conditions, superior to discrete Zener diodes. |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error, enabling high-impedance feedback networks for precision setpoints. |
| Voltage Regulation Range | VOUT = VREF × (1 + R1/R2) up to 18 V - allows flexible output programming with two external resistors, no additional ICs required. |
| Output Capacitance Stability | Stable without output capacitor - eliminates mandatory bulk capacitance, simplifying design for space-constrained isolated supplies. |
Pinout & Package
SOT-89-3 package (4.50 mm × 2.50 mm body, 1.8 mm height), thermally enhanced with exposed pad (not electrically connected), rated for 52°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to maintain reference voltage at REF pin; connects to optocoupler LED anode in isolated SMPS. |
| 2: REF | Reference voltage sense input | High-impedance input (≤0.5 μA) tied to resistor divider; internal comparator compares this to 1.24 V bandgap reference. |
| 3: ANODE | Common return / ground reference | Low-impedance common node; must be connected to system ground or power return; defines voltage reference point for all internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V - enables direct use in 1.8 V, 2.5 V, and 3.3 V systems without level-shifting or auxiliary bias. |
| Grade-A Q-temp accuracy | ±0.5% VREF at 25°C, ±31 mV over –40°C to +125°C - meets automotive AEC-Q100 Grade 1 requirements for precision feedback. |
| Ultra-low IREF | 0.1–0.5 μA - reduces resistor-divider power loss and voltage error, allowing >1 MΩ feedback networks for minimal quiescent current impact. |
| Sharp turn-on characteristic | Sub-100 μA minimum cathode current (IK(min)) - ensures reliable regulation start-up even in low-power standby modes. |
| SOT-89 pinout optimization | CATHODE–REF–ANODE sequence - places high-current cathode adjacent to thermal pad for improved heat dissipation in power supply designs. |
Applications
| Isolated Flyback SMPS Feedback | Zener Diode Replacement |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in 3.3 V/5 V AC-DC adapters using optocoupler-coupled feedback. IC Role / Device Role / Timing Role: Precision shunt regulator and error amplifier - compares sampled output voltage against internal 1.24 V reference and drives optocoupler LED current. Use Value: Enables <2.7 V minimum regulated output (1.24 V + opto VF) and improves cross-regulation vs. primary-side sensing. |
Use Scenario: On-board 3.3 V rail monitoring with hysteresis-free threshold detection. IC Role / Device Role / Timing Role: Comparator with integrated reference - REF pin senses divided rail voltage; CATHODE sinks current when threshold exceeded. Use Value: Eliminates external reference IC and reduces BOM count; 0.5 μA IREF cuts standby power vs. standard comparators. |
| Adjustable Data Converter Reference | Industrial Sensor Excitation |
|
Use Scenario: Programmable reference for 12-bit SAR ADCs in battery-powered data loggers. IC Role / Device Role / Timing Role: Adjustable voltage reference - configured with R1/R2 to deliver stable 2.048 V or 4.096 V reference to ADC REF pin. Use Value: ±0.5% initial accuracy and <31 mV drift over temperature ensure <0.5 LSB error contribution across full operating range. |
Use Scenario: Constant-current excitation for RTD or strain gauge bridges in PLC analog input modules. IC Role / Device Role / Timing Role: Shunt-based current source - REF pin biased to fixed voltage; cathode current set by series resistor to generate precise 1 mA or 2 mA bridge current. Use Value: 0.25 Ω dynamic impedance maintains current stability despite supply ripple; –40°C to +125°C rating matches industrial ambient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432AQDBZR | SOT-23-3 package (2.92 mm × 1.30 mm); identical electrical specs; pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE | Better suited for space-constrained layouts where thermal mass is less critical; lower thermal resistance not required | Select TLVH432AQDBZR when board area is premium and power dissipation ≤300 mW; verify PCB footprint and routing compatibility. |
| TLVH431AQPKG3 | Same SOT-89-3 package and Q-grade temp range, but TLVH431 pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE | Requires PCB layout revision due to reversed CATHODE/REF pin positions; functionally identical otherwise | Choose TLVH431AQPKG3 only if legacy design uses TLVH431 pinout; TLVH432AQPKG3 offers direct optocoupler anode connection without trace crossing. |
Compared with TLVH432AQDBZR and TLVH431AQPKG3, the TLVH432AQPKG3 uniquely combines automotive-grade accuracy, SOT-89 thermal performance, and cathode-first pinout-enabling simpler, more robust optocoupler interface in high-reliability isolated power supplies without layout redesign.
Availability
TLVH432AQPKG3 is available at Aetrix Electronics and suitable for automotive power management, industrial sensor interfaces, and isolated DC-DC converters requiring stable component supply with guaranteed long-term availability and full traceability.
Supply support for TLVH432AQPKG3 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 decades of expertise in precision references and power conversion ICs.
The TLVH432AQPKG3 belongs to TI's precision shunt regulator product line, designed specifically for high-accuracy, low-voltage feedback in isolated switching power supplies and industrial sensing systems demanding AEC-Q100 compliance.
FAQ
What is the exact pin configuration of TLVH432AQPKG3 in the SOT-89 package?
The TLVH432AQPKG3 uses a non-standard SOT-89 pinout: Pin 1 is CATHODE, Pin 2 is REF, and Pin 3 is ANODE (viewed from top, marking side up). This differs from TLVH431 variants and optimizes current path routing to optocouplers in flyback designs. Always verify against TI's SLVS555N Figure 4-7 before layout.
Does TLVH432AQPKG3 require an output capacitor for stability?
No, TLVH432AQPKG3 is internally compensated and remains stable without an output capacitor between CATHODE and ANODE. However, if a capacitor is added for noise filtering, TI's Figure 5-15 through 5-17 provide phase-margin guidance for values up to 10 nF depending on cathode voltage and load conditions.
What is the minimum cathode current needed for regulation in TLVH432AQPKG3?
The TLVH432AQPKG3 requires ≥100 μA cathode current (IK(min)) to enter regulation, per Section 5.5 of the datasheet. Below this, gain drops significantly - especially at temperature extremes - risking inaccurate reference tracking or open-loop behavior in feedback circuits.
How does the Q-grade temperature specification affect TLVH432AQPKG3 performance?
The "Q" suffix in TLVH432AQPKG3 denotes qualification for –40°C to +125°C operation, with VREF deviation limited to ±31 mV across that range. This ensures consistent regulation in automotive engine-control units and industrial motor drives where ambient temperatures exceed commercial-grade limits.
Can TLVH432AQPKG3 replace a standard 3.3 V Zener diode directly?
Yes - TLVH432AQPKG3 replaces 3.3 V Zeners with superior performance: 0.5% reference accuracy vs. ±5% Zener tolerance, 0.25 Ω dynamic impedance vs. 10–100 Ω Zener impedance, and <0.1 μA off-state current vs. 1–10 μA Zener leakage. Use R1/R2 to set VOUT = 3.3 V and connect CATHODE to supply rail.
TLVH432AQPKG3 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%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 100 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TLVH432AQPKG3 FAQ
1.How can I place an order for TLVH432AQPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432AQPKG3 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 TLVH432AQPKG3 reliable?
The price and inventory of TLVH432AQPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432AQPKG3 is usually 5 days.
3.What payment methods are accepted for TLVH432AQPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432AQPKG3 transactions.
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4.How is shipping managed for TLVH432AQPKG3?
TLVH432AQPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432AQPKG3 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 TLVH432AQPKG3?
For technical support, including TLVH432AQPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432AQPKG3 requirements.
6.How does Aetrix verify that TLVH432AQPKG3 is sourced from the original manufacturer or authorized distributors?
All TLVH432AQPKG3 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 TLVH432AQPKG3 meets industry standards.
7.What is the process for return or replacement of TLVH432AQPKG3?
All TLVH432AQPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432AQPKG3, 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 TLVH432AQPKG3 part is unused and in its original packaging.
Return procedure for TLVH432AQPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432AQPKG3 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
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LM4040CYM3-2.5-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
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