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Texas Instruments TL432LIBQDBZRQ1
- Part No.:
- TL432LIBQDBZRQ1
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432LIBQDBZRQ1.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:11,964
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Product details
Overview
TL432LIBQDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade programmable shunt regulator in SOT-23 (DBZ) package, featuring 0.5% reference voltage tolerance at 25°C, 2.495 V nominal Vref, 0.3 Ω typical dynamic impedance, and sink-current capability up to 15 mA. It serves as a precision voltage reference and error amplifier in feedback loops for DC/DC converters and LED current sinks.
For engineers reviewing the TL432LIBQDBZRQ1 datasheet, TL432LIBQDBZRQ1 pinout, TL432LIBQDBZRQ1 application, or TL432LIBQDBZRQ1 equivalent, key selection considerations include its optimized IREF (≤0.4 µA) and II(dev) (≤0.3 µA) for high-accuracy regulation, grade-1 temperature range (–40°C to +125°C), and DBZ-package pinout distinct from TL431LI-Q1.
Technical Context
The TL432LIBQDBZRQ1 implements a three-terminal shunt topology with an internal 2.495 V bandgap reference and high-gain op-amp driving a Darlington output stage. Its closed-loop operation relies on resistive feedback between cathode and reference pins to set output voltage from Vref to 36 V.
It operates in two functional modes: open-loop comparator mode (with integrated reference) requiring ≥0.6 mA cathode current for stable gain, and closed-loop shunt regulation mode where it maintains precise voltage or current by sinking cathode current proportional to reference-pin error. Thermal drift is limited to 27 mV over –40°C to +125°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Vref | 2.495 V nominal; sets minimum adjustable output voltage and defines regulation threshold accuracy (±0.5% at 25°C for B grade) |
| VKA Range | 2.495 V to 36 V; determines maximum output voltage achievable with external resistor divider |
| IKA Max | 15 mA; maximum continuous cathode sink current defining power handling and loop drive capability |
| Imin | 0.6 mA (max); minimum cathode current required to maintain regulation and avoid dropout |
| IREF Max | 0.4 µA; low input bias current enabling high-resistance feedback networks without significant error |
| |ZKA| Typ | 0.3 Ω; low dynamic impedance ensures stable regulation under load transients and minimal output voltage deviation |
| VI(dev) | 27 mV max over –40°C to +125°C; quantifies total reference voltage drift, critical for automotive thermal stability |
Pinout & Package
TL432LIBQDBZRQ1 is housed in a 3-pin SOT-23 (DBZ) package measuring 2.90 mm × 1.30 mm, optimized for space-constrained automotive PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 2) | Shunt current output / voltage sense node | Sinks regulated current; connects to feedback network output and power rail; voltage here is controlled relative to ANODE |
| REF (Pin 1) | Reference input / error-sense node | Compares external voltage to internal 2.495 V reference; requires ≤0.4 µA bias current; must not be left floating |
| ANODE (Pin 3) | Common return / ground reference | Establishes 0 V reference for both REF and VKA measurements; typically connected to system ground or low-side return path |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for automotive ambient temperatures from –40°C to +125°C, supporting engine bay and powertrain applications |
| 0.5% initial Vref tolerance (B grade) | Enables high-accuracy voltage setting without trimming, reducing BOM count and calibration cost in safety-critical systems |
| Optimized IREF and II(dev) | 0.4 µA max IREF and 0.3 µA max II(dev) minimize resistor-divider error and improve system-level accuracy across temperature |
| 0.3 Ω typical dynamic impedance | Provides sharp turn-on and tight regulation under fast load steps, outperforming standard Zener diodes in transient response |
| Pin-to-pin compatible alternative to TL431-Q1 | Same functionality as TL431LI-Q1 but with DBZ-package pinout swap (REF and CATHODE positions exchanged), enabling layout reuse with minor routing adjustment |
Applications
| DC/DC Converter Feedback | LED Lighting Current Sink |
|---|---|
Use Scenario: Regulating output voltage of isolated flyback or non-isolated buck converter via optocoupler feedback loop. IC Role / Device Role / Timing Role: Precision shunt reference and error amplifier comparing sampled output to 2.495 V reference. Use Value: Enables ±0.5% output regulation accuracy over temperature using low-cost resistors and optocoupler, meeting automotive power supply specs. | Use Scenario: Driving constant current through high-brightness LEDs in headlamp or interior lighting modules. IC Role / Device Role / Timing Role: Reference-controlled current sink regulating LED string current via external MOSFET or BJT. Use Value: Delivers stable 100 mA LED current with <1% error over –40°C to +125°C, ensuring consistent brightness and color point. |
| On-Board Charger (OBC) Voltage Monitor | Engine Management Actuator Control |
Use Scenario: Monitoring intermediate DC bus voltage during bidirectional OBC operation to trigger overvoltage protection. IC Role / Device Role / Timing Role: Comparator with integrated reference detecting voltage thresholds above 2.495 V. Use Value: Eliminates need for external reference IC; responds within microseconds to overvoltage events while consuming <1 µA quiescent current. | Use Scenario: Providing regulated bias voltage and error signal conditioning for solenoid driver circuits in transmission control units. IC Role / Device Role / Timing Role: Adjustable shunt regulator setting gate-drive reference and closed-loop current limit threshold. Use Value: Supports ASIL-B functional safety requirements via AEC-Q100 qualification and predictable failure modes under thermal stress. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431LIBQDBZRQ1 | Identical electrical specs and thermal performance, but reversed DBZ pinout: REF = Pin 2, CATHODE = Pin 1 | Requires PCB layout revision to swap REF/CATHODE connections; same thermal and accuracy behavior | Select TL431LIBQDBZRQ1 only when reusing existing TL431-based layouts; TL432LIBQDBZRQ1 avoids redesign if migrating from TL432 variants |
| TLVH431QDBVRQ1 | Lower Vref (1.24 V), higher IREF (1.5 µA), wider temp range (–40°C to +125°C), same DBZ package | Better suited for low-voltage rails (<5 V); less accurate at high temperatures due to higher VI(dev) (±50 mV) | Choose TLVH431QDBVRQ1 only when 1.24 V reference is required and 0.5% tolerance at 25°C is acceptable; not drop-in for 2.495 V designs |
Compared with TL431LIBQDBZRQ1, TL432LIBQDBZRQ1 enables direct replacement in TL432-designs without layout change, while TLVH431QDBVRQ1 offers lower reference voltage at the cost of reduced accuracy and higher bias current - making TL432LIBQDBZRQ1 optimal for 2.495 V–36 V automotive regulation where precision and thermal stability are critical.
Availability
TL432LIBQDBZRQ1 is available at Aetrix Electronics and suitable for automotive power conversion, LED lighting control, on-board charger monitoring, and engine management actuator circuits requiring stable component supply across extended temperature ranges.
Supply support for TL432LIBQDBZRQ1 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 automotive, industrial, and power management solutions.
The TL43xLI-Q1 product line delivers AEC-Q100-qualified shunt regulators optimized for high-accuracy voltage reference and error amplification in automotive power systems, replacing discrete Zener diodes with superior thermal stability and lower leakage.
FAQ
What is the reference voltage tolerance of TL432LIBQDBZRQ1 at 25°C?
The TL432LIBQDBZRQ1 has a reference voltage tolerance of ±0.5% at 25°C, corresponding to a nominal Vref of 2.495 V with a range of 2.483 V to 2.507 V. This B-grade accuracy is specified in the Electrical Characteristics table of the SNVSBA4A datasheet and applies across the full operating temperature range when combined with its 27 mV max VI(dev) specification.
How does the pinout of TL432LIBQDBZRQ1 differ from TL431LI-Q1 in the DBZ package?
TL432LIBQDBZRQ1 uses a swapped DBZ pinout versus TL431LI-Q1: REF is on Pin 1 and CATHODE on Pin 2, whereas TL431LI-Q1 places REF on Pin 2 and CATHODE on Pin 1. Both share identical ANODE on Pin 3 and identical SOT-23 footprint. This difference is explicitly documented in the "Pin Configuration and Functions" section of the datasheet and requires PCB trace revision for direct substitution.
What is the minimum cathode current required for TL432LIBQDBZRQ1 to regulate properly?
The TL432LIBQDBZRQ1 requires a minimum cathode current (Imin) of 0.6 mA to enter and maintain regulation. Below this threshold, the device exits linear operation and cannot sustain stable reference voltage at the REF pin. This value is specified in Section 7.5 of the datasheet under "Electrical Characteristics" and must be ensured in all operating conditions, including light-load or standby states.
Can TL432LIBQDBZRQ1 be used as a comparator, and what design considerations apply?
Yes, TL432LIBQDBZRQ1 can operate as an open-loop comparator with integrated 2.495 V reference. Key considerations include supplying ≥0.6 mA cathode current for sufficient gain, limiting input resistance to <10 kΩ to minimize IREF-induced voltage drop at the REF pin, and ensuring ≥10% overdrive (e.g., >2.75 V input) for fast response. These guidelines are detailed in Section 10.2.1 and Figure 20 of the datasheet.
What is the dynamic impedance of TL432LIBQDBZRQ1, and why does it matter in regulation?
The TL432LIBQDBZRQ1 has a typical dynamic impedance |ZKA| of 0.3 Ω, measured as ΔVKA/ΔIKA under regulation. This low value ensures minimal output voltage deviation during load transients - for example, a 10 mA step change causes only ~3 mV shift. It directly impacts regulation accuracy in switching power supplies and current sinks, distinguishing TL432LIBQDBZRQ1 from higher-impedance alternatives like standard Zener diodes.
TL432LIBQDBZRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432LIBQDBZRQ1 FAQ
1.How can I place an order for TL432LIBQDBZRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432LIBQDBZRQ1 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 TL432LIBQDBZRQ1 reliable?
The price and inventory of TL432LIBQDBZRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432LIBQDBZRQ1 is usually 5 days.
3.What payment methods are accepted for TL432LIBQDBZRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432LIBQDBZRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432LIBQDBZRQ1?
TL432LIBQDBZRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432LIBQDBZRQ1 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 TL432LIBQDBZRQ1?
For technical support, including TL432LIBQDBZRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432LIBQDBZRQ1 requirements.
6.How does Aetrix verify that TL432LIBQDBZRQ1 is sourced from the original manufacturer or authorized distributors?
All TL432LIBQDBZRQ1 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 TL432LIBQDBZRQ1 meets industry standards.
7.What is the process for return or replacement of TL432LIBQDBZRQ1?
All TL432LIBQDBZRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with TL432LIBQDBZRQ1, 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 TL432LIBQDBZRQ1 part is unused and in its original packaging.
Return procedure for TL432LIBQDBZRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432LIBQDBZRQ1 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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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
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
Texas Instruments
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LM4041DIM3-ADJ/NOPB
Texas Instruments
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LM4040DIM3X-2.5/NOPB
Texas Instruments
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LM4040DIM3-2.5/NOPB
Texas Instruments
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AZ431LANTR-G1
Diodes Incorporated
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