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Texas Instruments TLVH432IPKG3
- Part No.:
- TLVH432IPKG3
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432IPKG3.pdf
- Description:
- IC VREF SHUNT ADJ 1.5% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,441
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Product details
Overview
TLVH432IPKG3 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, and operation from –40°C to +125°C. It functions as an error amplifier or comparator with integrated reference in isolated flyback SMPS feedback loops.
For engineers reviewing the TLVH432IPKG3 datasheet, TLVH432IPKG3 pinout, TLVH432IPKG3 application, or TLVH432IPKG3 equivalent, key selection criteria include its 1.24 V reference accuracy, ultra-low 0.25 Ω dynamic impedance, SOT-89 thermal performance (RθJA = 52°C/W), and compatibility with optocoupler-based secondary-side regulation in 3.3 V systems.
Technical Context
The TLVH432IPKG3 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 mode enables precise voltage monitoring via comparator action, while closed-loop configuration with external resistors sets output voltage from 1.24 V to 18 V.
Unlike the TLVH431, the TLVH432IPKG3 uses reversed pinout (CATHODE–REF–ANODE) in SOT-89-3, enabling direct replacement in space-constrained layouts where anode-to-ground routing simplifies PCB trace routing. It achieves stable regulation without output capacitance due to internal compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage (VREF) | 1.24 V ±0.5% at 25°C - enables accurate low-voltage setpoints down to 1.24 V in feedback networks |
| Cathode Current Range | 100 μA to 70 mA - supports regulation in ultra-low-power standby modes and higher-current load conditions |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under varying load currents |
| Operating Temperature | –40°C to +125°C - qualified for automotive and industrial environments requiring extended thermal range |
| Output Voltage Range | 1.24 V to 18 V - adjustable via two external resistors, covering most DC-DC converter and sensing applications |
| Reference Input Current | 0.1–0.5 μA - minimizes resistor-divider loading error and power loss in precision voltage-setting circuits |
| Thermal Resistance (RθJA) | 52°C/W (SOT-89) - allows higher continuous power dissipation than SOT-23 variants under same ambient conditions |
Pinout & Package
SOT-89-3 package: 4.50 mm × 2.50 mm body, surface-mount, thermally enhanced with exposed pad (not electrically connected).
| 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 pin |
| 2: REF | Reference threshold input | Compares against internal 1.24 V reference; must be biased with ≥0.1 μA current via external resistor divider |
| 3: ANODE | Common return / ground reference | Typically connected to system ground; serves as voltage reference point for both REF and cathode terminals |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulating at 1.24 V cathode-to-anode voltage - enables use in 1.8 V, 2.5 V, and 3.3 V systems where TL431 cannot function |
| Ultra-low dynamic impedance | 0.25 Ω typical - reduces output voltage deviation under load transients, improving PSRR in feedback paths |
| High-temperature grade | –40°C to +125°C operation (Q-grade) - supports under-hood automotive and industrial control applications |
| Reversed SOT-89 pinout | CATHODE–REF–ANODE sequence - simplifies PCB layout by placing anode adjacent to ground plane for lower EMI and improved thermal conduction |
| Integrated reference + amplifier | No external reference required - eliminates component count and drift errors in comparator or error-amplifier configurations |
Applications
| Isolated Flyback SMPS Feedback | Voltage Monitoring & Threshold Detection |
|---|---|
|
Use Scenario: Secondary-side voltage regulation in 3.3 V isolated flyback converters using optocoupler feedback. IC Role / Device Role / Timing Role: Error amplifier and precision reference in closed-loop feedback path; compares sampled output against 1.24 V reference. Use Value: Enables stable regulation down to 2.7 V output (1.24 V + opto LED drop), meeting tight 3.3 V ±3% requirements across line/load/temperature. |
Use Scenario: Monitoring 5 V or 12 V power rails for undervoltage lockout or brownout detection. IC Role / Device Role / Timing Role: Comparator with built-in reference; triggers reset or alert when rail drops below programmable threshold. Use Value: Eliminates external reference IC and reduces BOM count; 0.1 μA REF current minimizes divider power loss and improves accuracy. |
| Zener Diode Replacement | Data Converter Reference |
|
Use Scenario: Replacing 2.5 V or 3.3 V Zener diodes in on-board LDO pre-regulation or biasing circuits. IC Role / Device Role / Timing Role: Precision shunt regulator providing stable reference voltage with sharp turn-on characteristic. Use Value: Reduces leakage current by >90% vs. Zener diodes, improving efficiency in battery-powered systems and reducing temperature drift. |
Use Scenario: Providing stable reference voltage for 12-bit to 16-bit SAR or delta-sigma ADCs in sensor signal chains. IC Role / Device Role / Timing Role: Low-noise, low-drift voltage reference source for analog front-end precision. Use Value: 0.25 Ω dynamic impedance and <12 mV VREF deviation over –40°C to +125°C ensure <0.1% reference error in high-resolution conversion. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432IDBZR | SOT-23-3 package (2.92 mm × 1.30 mm); same electrical specs but higher RθJA (206°C/W) | Better suited for space-constrained boards where thermal mass is limited; less effective in high-power dissipation scenarios | Select TLVH432IDBZR only when board area is critical and power dissipation remains <150 mW. |
| TLVH431IPK | Same SOT-89-3 package but standard pinout (REF–CATHODE–ANODE); identical electrical specs | Requires PCB layout revision to accommodate reversed REF/CATHODE routing; not drop-in compatible | Choose TLVH431IPK only if existing design uses TLVH431 pinout and thermal performance is acceptable. |
Compared with TLVH432IDBZR and TLVH431IPK, the TLVH432IPKG3 delivers superior thermal performance in SOT-89 form factor and enables simplified ground-plane routing via its CATHODE–REF–ANODE pin sequence-critical for noise-sensitive feedback paths in isolated power supplies.
Availability
TLVH432IPKG3 is available at Aetrix Electronics and suitable for isolated SMPS feedback, voltage monitoring, precision shunt regulation, and data converter reference applications requiring stable component supply across automotive, industrial, and telecom end equipment.
Supply support for TLVH432IPKG3 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 TLVH432IPKG3 belongs to TI's precision shunt regulator product line, designed specifically for low-voltage, high-accuracy feedback and reference applications in isolated power supplies, voltage supervision, and instrumentation systems.
FAQ
What is the reference voltage tolerance of TLVH432IPKG3 at 25°C?
The TLVH432IPKG3 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to the 'B' grade designation. This means its VREF falls between 1.234 V and 1.246 V under nominal conditions, ensuring high-accuracy voltage setting in feedback networks and reference circuits.
Can TLVH432IPKG3 operate with cathode voltages below 1.24 V?
No, TLVH432IPKG3 requires a minimum cathode-to-anode voltage of 1.24 V to enter regulation. Below this threshold, the device remains in cutoff and cannot maintain reference accuracy. Its functional range starts precisely at VREF and extends up to 18 V.
What is the maximum continuous cathode current rating for TLVH432IPKG3?
The absolute maximum cathode current for TLVH432IPKG3 is 70 mA under recommended operating conditions. Exceeding this value risks thermal overstress, especially given its SOT-89 package RθJA of 52°C/W; derating is advised above 50 mA in ambient temperatures >60°C.
How does the pinout of TLVH432IPKG3 differ from TLVH431IPKG3?
TLVH432IPKG3 uses CATHODE–REF–ANODE pinout (Pin 1–2–3), whereas TLVH431IPKG3 uses REF–CATHODE–ANODE. This reversal places the anode adjacent to the SOT-89 tab for improved grounding and thermal conduction-requiring PCB layout changes for direct substitution.
Is an output capacitor required for stability with TLVH432IPKG3?
No, TLVH432IPKG3 is internally compensated and stable without an output capacitor. However, if added, capacitive loads up to 10 nF can be used with proper phase margin verification per Figures 5-15 to 5-17 in the datasheet to avoid oscillation in high-gain feedback configurations.
TLVH432IPKG3 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
TLVH432IPKG3 FAQ
1.How can I place an order for TLVH432IPKG3 through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432IPKG3 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 TLVH432IPKG3 reliable?
The price and inventory of TLVH432IPKG3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432IPKG3 is usually 5 days.
3.What payment methods are accepted for TLVH432IPKG3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432IPKG3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432IPKG3?
TLVH432IPKG3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432IPKG3 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 TLVH432IPKG3?
For technical support, including TLVH432IPKG3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432IPKG3 requirements.
6.How does Aetrix verify that TLVH432IPKG3 is sourced from the original manufacturer or authorized distributors?
All TLVH432IPKG3 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 TLVH432IPKG3 meets industry standards.
7.What is the process for return or replacement of TLVH432IPKG3?
All TLVH432IPKG3 units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432IPKG3, 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 TLVH432IPKG3 part is unused and in its original packaging.
Return procedure for TLVH432IPKG3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432IPKG3 Tags
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TL431BQDBZR
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LM4040DIM3X-2.5/NOPB
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AZ431LANTR-G1
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