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Texas Instruments TLVH432QPKG3
- Part No.:
- TLVH432QPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432QPKG3.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,000
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Product details
Overview
TLVH432QPKG3 from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, featuring 1.24 V reference voltage (±0.5% at 25°C), –40°C to +125°C operation, 100 μA to 70 mA cathode current range, and 0.25 Ω typical dynamic impedance. It serves as an error amplifier or voltage reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432QPKG3 datasheet, TLVH432QPKG3 pinout, TLVH432QPKG3 application, or TLVH432QPKG3 equivalent, key selection criteria include reference accuracy grade (Q-grade for automotive temp range), SOT-89 pin compatibility with TLVH431 variants, cathode-to-anode voltage headroom down to 1.24 V, and stability without output capacitance in closed-loop regulation.
Technical Context
The TLVH432QPKG3 implements a precision bandgap reference and high-gain transconductance amplifier in a 3-terminal shunt topology. Its internal architecture forces the REF pin to 1.24 V relative to ANODE when sufficient cathode current (≥100 μA) flows, enabling adjustable output voltage from 1.24 V to 18 V via two external resistors.
Unlike the TLVH431, the TLVH432QPKG3 uses reversed pinout in SOT-89: Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF - enabling direct replacement in layouts where cathode routing requires top-side connection. It operates stably without output capacitors but supports capacitive load compensation per Figures 5-15–5-17.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% at 25°C; defines minimum regulation voltage and sets feedback divider ratio. |
| Temp Range | –40°C to +125°C (Q-grade); qualified for under-hood automotive power supply monitoring. |
| Cathode Current Range | 100 μA to 70 mA; enables low-power biasing and high-current shunt regulation without external amplification. |
| Dynamic Impedance | 0.25 Ω typical; ensures tight output voltage regulation under varying load conditions in feedback loops. |
| Output Voltage Range | 1.24 V to 18 V (adjustable); supports 3.3 V, 5 V, and 12 V rail monitoring and regulation with single device. |
| Ref Input Current | 0.1–0.5 μA; minimizes divider resistor loading error and enables high-impedance feedback networks. |
| VKA vs VREF Drift | –1.5 to –2.7 mV/V; quantifies reference voltage shift under cathode voltage variation-critical for wide-input-range SMPS. |
Pinout & Package
SOT-89-3 package (4.50 mm × 2.50 mm × 1.60 mm), surface-mount, thermally enhanced with exposed pad connected to ANODE internally.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: CATHODE | Shunt current input / output node | Primary current path; sinks regulated current to ANODE; connects to optocoupler LED anode in isolated SMPS. |
| 2: ANODE | Common return / ground reference | Must be tied to system ground or lowest potential node; thermal pad connects here for heat dissipation. |
| 3: REF | Feedback threshold input | Compares against internal 1.24 V reference; connects to voltage divider midpoint for adjustable regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Regulates down to 1.24 V cathode-to-anode voltage-enables use in 1.8 V and 3.3 V systems where TL431 fails. |
| Ultra-low reference current | 0.1–0.5 μA REF pin current minimizes power loss and resistor thermal drift in high-impedance dividers. |
| Automotive-grade temperature range | –40°C to +125°C operation with 0.5% initial tolerance meets AEC-Q100 stress test requirements for power rail monitors. |
| Stable without output capacitor | Internally compensated design eliminates need for cathode-to-anode bypass capacitor-reduces BOM count and layout area. |
| Sharp turn-on characteristic | High open-loop gain enables fast comparator response (<1 µs rise time in Figure 5-12), suitable for overvoltage latch detection. |
Applications
| Secondary-Side Regulation | Zener Diode Replacement |
|---|---|
Use Scenario: Isolated 3.3 V flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Error amplifier and precision voltage reference on secondary side. Use Value: Enables regulation down to 2.7 V output (1.24 V + opto LED drop), improving efficiency over TL431-based designs. | Use Scenario: Low-leakage voltage clamp on 5 V microcontroller I/O line. IC Role / Device Role / Timing Role: Adjustable shunt regulator replacing discrete Zener diode. Use Value: 0.02–0.1 μA off-state cathode current reduces standby power by >95% versus 500 μA Zener leakage. |
| Voltage Monitoring | Comparator with Integrated Reference |
Use Scenario: Real-time monitoring of 12 V battery rail in automotive ECU. IC Role / Device Role / Timing Role: Precision threshold detector with hysteresis via external resistor network. Use Value: Q-grade temp stability ensures ±12 mV max VREF deviation across –40°C to +125°C-no calibration required. | Use Scenario: Overvoltage protection circuit triggering at 4.2 V for Li-ion charging path. IC Role / Device Role / Timing Role: Open-loop comparator comparing divided input to internal 1.24 V reference. Use Value: Eliminates external reference IC; 100 μA min cathode current enables direct MCU GPIO drive without buffer. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431QPKG3 | Different pinout: Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE in same SOT-89 package. | Requires PCB layout change; not drop-in compatible-used where REF routing dominates top layer. | Select TLVH431QPKG3 only if existing layout places REF on pin 1; otherwise TLVH432QPKG3 simplifies cathode routing. |
| TLVH432AQDBZR | SOT-23-3 package (2.92 mm × 1.30 mm); same pinout (CATHODE-REF-ANODE) but smaller footprint and lower thermal mass. | Lower power dissipation capability (RθJA = 206°C/W vs 52°C/W); unsuitable for >150 mW continuous loads. | Choose TLVH432AQDBZR for space-constrained consumer electronics; retain TLVH432QPKG3 for automotive thermal reliability. |
Compared with TLVH431QPKG3, TLVH432QPKG3 offers reversed pinout for optimized cathode routing in high-current SMPS; compared with TLVH432AQDBZR, it delivers 4× better thermal performance in SOT-89-critical for sustained 70 mA operation in engine-control modules.
Availability
TLVH432QPKG3 is available at Aetrix Electronics and suitable for automotive power rail monitoring, isolated flyback SMPS feedback, and precision voltage clamping requiring stable component supply across extended temperature ranges.
Supply support for TLVH432QPKG3 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 solutions, with leadership in precision analog ICs and automotive-qualified components.
The TLVH432 product line delivers low-voltage, high-accuracy shunt references for safety-critical power management in automotive, industrial, and telecom systems-designed specifically to replace TL431 in next-generation 3.3 V and 1.8 V architectures.
FAQ
What is the reference voltage tolerance of TLVH432QPKG3 at 25°C?
The TLVH432QPKG3 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a 1.24 V nominal value ranging from 1.234 V to 1.246 V. This B-grade accuracy is specified in Section 5.7 of the TI datasheet SLVS555N and applies across the full Q-grade temperature range (–40°C to +125°C) with ≤31 mV total deviation.
How does the pinout of TLVH432QPKG3 differ from TLVH431QPKG3?
The TLVH432QPKG3 uses Pin 1 = CATHODE, Pin 2 = ANODE, Pin 3 = REF in its SOT-89 package, whereas TLVH431QPKG3 uses Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE. This reversal allows direct cathode connection to top-layer traces in SMPS layouts without vias, as confirmed in Figure 4-7 of the datasheet.
Can TLVH432QPKG3 operate without an output capacitor?
Yes, TLVH432QPKG3 is internally compensated and operates stably without a cathode-to-anode output capacitor. Its architecture avoids the phase-margin degradation seen in uncompensated shunt regulators. However, if a capacitor is added, Figures 5-15–5-17 provide phase-margin guidance for 1.25 V, 2.5 V, and 5 V cathode voltages.
What is the minimum cathode current required for regulation in TLVH432QPKG3?
The TLVH432QPKG3 requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 (IK(min)) of the datasheet. Below this threshold, open-loop gain drops significantly-verified in Figure 5-5 showing IK(min) rising to 120 μA at +125°C-so designs must ensure ≥100 μA under worst-case conditions.
Is TLVH432QPKG3 qualified for automotive applications?
Yes, TLVH432QPKG3 carries the "Q" suffix indicating qualification for automotive applications, with guaranteed operation from –40°C to +125°C and compliance with AEC-Q100 stress testing requirements. Its 0.5% reference tolerance and low thermal drift make it suitable for engine control, ADAS power monitoring, and infotainment system voltage supervision.
TLVH432QPKG3 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
TLVH432QPKG3 FAQ
1.How can I place an order for TLVH432QPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432QPKG3 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 TLVH432QPKG3 reliable?
The price and inventory of TLVH432QPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432QPKG3 is usually 5 days.
3.What payment methods are accepted for TLVH432QPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432QPKG3 transactions.
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4.How is shipping managed for TLVH432QPKG3?
TLVH432QPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432QPKG3 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 TLVH432QPKG3?
For technical support, including TLVH432QPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432QPKG3 requirements.
6.How does Aetrix verify that TLVH432QPKG3 is sourced from the original manufacturer or authorized distributors?
All TLVH432QPKG3 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 TLVH432QPKG3 meets industry standards.
7.What is the process for return or replacement of TLVH432QPKG3?
All TLVH432QPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432QPKG3, 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 TLVH432QPKG3 part is unused and in its original packaging.
Return procedure for TLVH432QPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432QPKG3 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
Microchip Technology
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LM4040CYM3-4.1-TR
Microchip Technology
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LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
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