My Inquiry
My Account
Texas Instruments TLVH432ACPK
- Part No.:
- TLVH432ACPK
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-243AA
- Datasheet:
-
TLVH432ACPK.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,291
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TLVH432ACPK from Texas Instruments is a low-voltage adjustable precision shunt regulator in SOT-89-3 package, providing 1.24 V reference voltage with ±1% 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.
For engineers reviewing the TLVH432ACPK datasheet, TLVH432ACPK pinout, TLVH432ACPK application, or TLVH432ACPK equivalent, key selection criteria include reference accuracy over temperature, dynamic impedance (0.25 Ω), cathode voltage headroom (down to 1.24 V), and compatibility with optocoupler-based secondary-side regulation circuits.
Technical Context
The TLVH432ACPK 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 comparator mode enables precise voltage monitoring without external reference components.
In closed-loop configuration, it regulates output voltage via resistive divider feedback between cathode and reference pins, supporting adjustable output from 1.24 V to 18 V. The device achieves thermal stability across industrial and automotive temperature ranges without requiring external compensation capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±1% at 25°C - sets minimum regulation threshold and defines feedback divider ratio |
| Cathode Current Range | 100 μA to 70 mA - determines minimum bias for stable regulation and maximum shunt power handling |
| Dynamic Impedance | 0.25 Ω typical - ensures tight output voltage regulation under load transients |
| Operating Temperature | –40°C to +125°C - supports automotive and industrial environments without derating |
| Output Voltage Range | 1.24 V to 18 V - enables flexible adjustment using two external resistors |
| Reference Input Current | 0.1–0.5 μA - minimizes divider current error and improves accuracy at high resistor values |
Pinout & Package
SOT-89-3 package (4.50 mm × 2.50 mm body) with gull-wing leads; thermally enhanced tab connected to anode for PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / output node | Primary connection point for regulated voltage rail; sinks current to maintain reference voltage at REF pin |
| REF (Pin 2) | Feedback input / reference threshold sense | Compares external voltage against internal 1.24 V reference; requires ≥0.1 μA input current for proper biasing |
| ANODE (Pin 3) | Common return / ground reference | Low-impedance return path; must be connected to system ground or lowest potential node in shunt configuration |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | Starts regulation 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 reference input current | 0.1–0.5 μA - allows high-value feedback resistors (>1 MΩ), reducing power loss and improving noise immunity |
| Stable without output capacitor | Internally compensated - eliminates need for cathode-to-anode capacitor in most applications, simplifying layout |
| Sharp turn-on characteristic | High open-loop gain and Darlington output - provides fast response in comparator mode for voltage monitoring and fault detection |
| Wide cathode current range | 100 μA to 70 mA - supports both ultra-low-power sensing and high-current shunt regulation in same device |
Applications
| Adjustable Voltage Reference for Data Converters | Secondary-Side Regulation in Flyback SMPS |
|---|---|
Use Scenario: Precision ADC/DAC reference in battery-powered instrumentation requiring stable 2.048 V or 4.096 V reference derived from 3.3 V rail. IC Role / Device Role / Timing Role: Adjustable shunt reference generating accurate, low-drift reference voltage independent of supply variation. Use Value: 1.24 V base reference with ±1% tolerance and 0.25 Ω dynamic impedance ensures <0.01% reference error across operating conditions. | Use Scenario: Isolated feedback path in 3.3 V/5 V offline flyback converter using PC817 optocoupler. IC Role / Device Role / Timing Role: Error amplifier and voltage reference on secondary side, comparing output voltage against internal 1.24 V and driving optocoupler LED. Use Value: Enables regulation down to 2.7 V output (1.24 V + optocoupler VF) with stable loop response across –40°C to +125°C. |
| Zener Diode Replacement | Voltage Monitoring for Power Rails |
Use Scenario: Replacing 3.3 V Zener diode in microcontroller reset circuit with lower leakage and tighter tolerance. IC Role / Device Role / Timing Role: Precision shunt element providing sharp knee and predictable breakdown behavior. Use Value: Off-state cathode current ≤0.1 μA at 18 V and 1.24 V reference tolerance eliminate false resets caused by Zener leakage drift. | Use Scenario: Monitoring 12 V automotive subsystem rail for undervoltage lockout at 10.5 V threshold. IC Role / Device Role / Timing Role: Comparator with integrated reference detecting rail collapse below programmable threshold. Use Value: Open-loop gain >10,000 and reference stability over temperature ensure reliable trip point without external reference IC. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH432CPK | ±1.5% reference tolerance at 25°C; wider initial error band | Suitable for cost-sensitive non-precision applications where 1.24 V ±1.5% is acceptable | Select TLVH432CPK when reference accuracy requirements are relaxed and BOM cost reduction is prioritized |
| TLVH432BPK | ±0.5% reference tolerance at 25°C; tighter initial accuracy | Required for high-accuracy feedback in telecom or test equipment where <0.5% error budget is mandated | Select TLVH432BPK when system-level calibration margin demands sub-0.5% reference contribution |
Compared with TLVH432CPK and TLVH432BPK, the TLVH432ACPK delivers balanced performance: tighter accuracy than the C-grade for robust design margins, yet more cost-effective than the B-grade where ±1% meets system specifications.
Availability
TLVH432ACPK is available at Aetrix Electronics and suitable for isolated power supplies, precision analog references, voltage supervision circuits, and industrial sensor interfaces requiring stable component supply across extended temperature ranges.
Supply support for TLVH432ACPK 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 TLVH43x family was designed specifically for low-voltage shunt regulation and error amplification in isolated DC/DC converters, replacing discrete Zener diodes while delivering superior accuracy, temperature stability, and noise performance.
FAQ
What is the reference voltage tolerance of TLVH432ACPK at 25°C?
The TLVH432ACPK has a reference voltage tolerance of ±1% at 25°C, corresponding to a 1.24 V nominal reference with bounds of 1.228 V to 1.252 V. This A-grade accuracy is confirmed in Section 5.6 of the TI SLVS555N datasheet and applies specifically to the TLVH432ACPK variant in SOT-89 package.
How does TLVH432ACPK differ from TLVH431ACPK?
The TLVH432ACPK uses reversed pinout (CATHODE-REF-ANODE) versus TLVH431ACPK (REF-CATHODE-ANODE) in the same SOT-89 package. This alternate pinout simplifies PCB layout when routing feedback signals from cathode to reference in flyback designs. Both share identical electrical specs, including 1.24 V ±1% reference and –40°C to +125°C operation.
What is the minimum cathode current required for regulation in TLVH432ACPK?
The TLVH432ACPK requires a minimum cathode current of 100 μA to maintain regulation, as specified in Section 5.5 of the datasheet under IK(min). This value holds across the full operating temperature range and is critical for ensuring stable reference voltage during light-load or standby conditions in SMPS designs.
Can TLVH432ACPK operate without an output capacitor?
Yes, TLVH432ACPK is internally compensated and operates stably without an output capacitor between cathode and anode in most configurations. Section 7.3 confirms this capability, though Figure 5-15 through 5-17 provide guidance for selecting optional capacitors when driving capacitive loads exceeding 1 nF in sensitive feedback paths.
What is the dynamic impedance specification for TLVH432ACPK?
The TLVH432ACPK has a typical dynamic impedance of 0.25 Ω, measured at 1 kHz with cathode current ranging from 0.1 mA to 70 mA. This low impedance directly determines output voltage regulation error under load transients and is validated in Section 5.5's |zKA| parameter table for TLVH432 devices.
TLVH432ACPK 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
TLVH432ACPK FAQ
1.How can I place an order for TLVH432ACPK through Aetrix?
Please submit a Request for Quotation (RFQ) for TLVH432ACPK 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 TLVH432ACPK reliable?
The price and inventory of TLVH432ACPK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TLVH432ACPK is usually 5 days.
3.What payment methods are accepted for TLVH432ACPK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TLVH432ACPK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TLVH432ACPK?
TLVH432ACPK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TLVH432ACPK 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 TLVH432ACPK?
For technical support, including TLVH432ACPK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TLVH432ACPK requirements.
6.How does Aetrix verify that TLVH432ACPK is sourced from the original manufacturer or authorized distributors?
All TLVH432ACPK 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 TLVH432ACPK meets industry standards.
7.What is the process for return or replacement of TLVH432ACPK?
All TLVH432ACPK units undergo pre-shipment inspection (PSI). If there is an issue with TLVH432ACPK, 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 TLVH432ACPK part is unused and in its original packaging.
Return procedure for TLVH432ACPK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TLVH432ACPK Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
