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Texas Instruments TL432AQDBZRG4
- Part No.:
- TL432AQDBZRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432AQDBZRG4.pdf
- Description:
- IC VREF SHUNT ADJ 1% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,830
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Product details
Overview
TL432AQDBZRG4 from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, featuring 1% initial reference voltage tolerance at 25°C, −40°C to +125°C operating temperature range, and 14 mV max reference voltage deviation over full temperature range. It delivers 0.2 Ω typical dynamic impedance and supports 1–100 mA sink current for feedback regulation in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432AQDBZRG4 datasheet, TL432AQDBZRG4 pinout, TL432AQDBZRG4 application, or TL432AQDBZRG4 equivalent, key selection criteria include automotive-grade thermal stability (Q-temp), SOT-23-3 footprint compatibility, adjustable output from 2.47 V to 36 V via two external resistors, and low-noise operation critical for closed-loop voltage sensing.
Technical Context
The TL432AQDBZRG4 implements a three-terminal adjustable shunt regulator architecture with an internal precision bandgap reference and high-gain error amplifier. Its REF–ANODE–CATHODE pinout differs from TL431, enabling direct integration into compact feedback networks without layout rework when replacing legacy TL431 designs in Q-temp applications.
It operates as a voltage-controlled current sink: when the REF pin voltage exceeds 2.47 V (min), the device pulls cathode current to maintain regulation. Thermal drift is stabilized by on-die compensation, yielding ≤34 mV total deviation across −40°C to +125°C - verified per TL432AQ electrical characteristics table.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.47–2.52 V at 25°C (1% A-grade tolerance); sets minimum adjustable output of external resistor divider. |
| Temp Range | −40°C to +125°C (Q-grade); qualified for under-hood automotive and industrial motor drive environments. |
| Vref Deviation | Max ±14 mV over full temperature range; ensures <±0.56% output voltage drift in 25 V systems. |
| Dynamic Impedance | 0.2 Ω typical (≤0.5 Ω max); maintains tight regulation under fast load transients in switching PSUs. |
| Sink Current | 1–100 mA continuous; supports direct interface with optocoupler LEDs in isolated flyback feedback loops. |
| Output Noise | Low broadband noise (typ. 20 µVRMS over 10 Hz–10 kHz); minimizes jitter in precision voltage monitoring. |
| Ref Input Current | 2–4 µA at 25°C; enables high-impedance resistor dividers (e.g., 1 MΩ top + 100 kΩ bottom) without loading error. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm body, 0.95 mm height), surface-mount, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE | Current sink output | Connects to switched node (e.g., optocoupler anode or error amp input); carries full regulation current. |
| REF | Reference input threshold | Sense point for external resistor divider; triggers regulation when voltage ≥2.47 V. |
| ANODE | Common return path | Typically tied to system ground or PSU output common; completes current loop for shunt operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive-Qualified Temp Range | −40°C to +125°C operation (Q-grade) enables use in engine control units and traction inverters. |
| Precision Reference Tolerance | 1% initial accuracy (A-grade) reduces need for post-production calibration in factory-set power rails. |
| Low Dynamic Impedance | 0.2 Ω typical impedance ensures <10 mV output shift during 50 mA load steps in telecom PSUs. |
| Adjustable Output Range | 2.47 V to 36 V via two-resistor divider; replaces multiple fixed Zener diodes in multi-rail systems. |
| Low Ref Input Current | 2–4 µA max allows >100 kΩ divider networks, minimizing standby power in battery-backed circuits. |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Secondary-side voltage regulation in 48 V input, 12 V/50 A isolated server PSU with digital PMBus control. IC Role / Device Role / Timing Role: Shunt reference in optocoupler feedback loop, setting precise 12.0 V ±1% output. Use Value: 1% Vref tolerance and 14 mV temp drift ensure output stays within Intel VR14 spec limits across chassis thermal gradients. |
Use Scenario: Output voltage sensing in 3-phase 400 VAC-to-24 VDC industrial rectifier with active PFC stage. IC Role / Device Role / Timing Role: Precision shunt reference driving TL431-based error amplifier in secondary-side regulation circuit. Use Value: 0.2 Ω dynamic impedance suppresses ripple-induced output variation during 10 kHz PFC switching noise coupling. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring in 220 VAC-fed variable-frequency drive for HVAC compressors. IC Role / Device Role / Timing Role: High-stability reference for analog-to-digital converter input scaling in bus voltage protection circuit. Use Value: −40°C to +125°C rating guarantees accurate 750 V bus measurement even inside sealed inverter enclosures at full load. |
Use Scenario: Feedback reference for dual-loop (current + velocity) control in 400 W servo amplifier with resolver interface. IC Role / Device Role / Timing Role: Stable 2.5 V reference for DAC output buffering and current-sense amplifier offset calibration. Use Value: Low 2–4 µA input current prevents loading error in high-precision 16-bit DAC output stages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431AQDBZR | Same A-grade tolerance and Q-temp rating, but TL431 pinout (REF–ANODE–CATHODE vs TL432's CATHODE–REF–ANODE). | Requires PCB layout revision due to reversed REF/CATHODE pins; not drop-in compatible. | Select only if redesigning feedback network layout and leveraging TL431's broader design documentation base. |
| TLVH431AQDBZR | Lower 1.24 V reference (vs 2.47 V), 1% tolerance, same Q-temp range; higher 20 µA ref current. | Better suited for low-voltage rails (<5 V); unsuitable for 12 V+ outputs without level-shifting. | Choose when designing sub-3.3 V auxiliary supplies where lower Vref improves divider resolution and reduces power loss. |
Compared with TL431AQDBZR, TL432AQDBZRG4 avoids board re-spin in space-constrained SOT-23-3 layouts; versus TLVH431AQDBZR, it provides higher Vref headroom essential for industrial 24 V and 48 V systems without additional amplification.
Availability
TL432AQDBZRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and AC inverter drives requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432AQDBZRG4 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 ICs, with decades of expertise in precision reference and power control technologies.
The TL43x family was designed for high-reliability voltage regulation in safety-critical power systems, emphasizing thermal stability, low noise, and wide operating range - particularly for automotive, industrial, and telecom infrastructure.
FAQ
What is the reference voltage tolerance of TL432AQDBZRG4 at 25°C?
The TL432AQDBZRG4 has a 1% initial reference voltage tolerance at 25°C, meaning its Vref falls between 2.470 V and 2.520 V under nominal conditions. This A-grade specification is confirmed in Section 6.10 of the TI SLVS543S datasheet and applies specifically to the TL432AQ variant in DBZ packaging.
How does TL432AQDBZRG4 differ from TL431AQDBZR in pin configuration?
The TL432AQDBZRG4 uses a CATHODE–REF–ANODE pinout (Pin 1–2–3), while TL431AQDBZR uses REF–ANODE–CATHODE. This reversal means direct substitution requires PCB layout changes. The TL432AQDBZRG4 pinout is optimized for simplified optocoupler feedback routing in compact SOT-23-3 designs.
What is the maximum reference voltage deviation over temperature for TL432AQDBZRG4?
The TL432AQDBZRG4 exhibits a maximum reference voltage deviation of ±14 mV over its full −40°C to +125°C operating range, as specified in Table 6.7 (TL432Q) and Table 6.10 (TL432AQ) of the datasheet. This corresponds to ±0.56% drift relative to 2.5 V nominal.
Can TL432AQDBZRG4 be used in place of a Zener diode?
Yes - the TL432AQDBZRG4 functions as a precision, adjustable shunt regulator and is explicitly positioned as a superior replacement for Zener diodes in applications like onboard regulation and switching power supplies. Its sharp turn-on characteristic, low dynamic impedance (0.2 Ω), and tight tolerance make it ideal for high-accuracy feedback paths where Zeners lack stability.
What is the recommended minimum cathode current for regulation in TL432AQDBZRG4?
The TL432AQDBZRG4 requires a minimum cathode current of 0.4 mA to maintain regulation, per Section 6.10 Electrical Characteristics. This Imin value ensures stable operation even under light-load conditions in standby or low-power modes of industrial power supplies.
TL432AQDBZRG4 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:
- Discontinued at Digi-Key
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.495V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
TL432AQDBZRG4 FAQ
1.How can I place an order for TL432AQDBZRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432AQDBZRG4 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 TL432AQDBZRG4 reliable?
The price and inventory of TL432AQDBZRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432AQDBZRG4 is usually 5 days.
3.What payment methods are accepted for TL432AQDBZRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432AQDBZRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432AQDBZRG4?
TL432AQDBZRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432AQDBZRG4 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 TL432AQDBZRG4?
For technical support, including TL432AQDBZRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432AQDBZRG4 requirements.
6.How does Aetrix verify that TL432AQDBZRG4 is sourced from the original manufacturer or authorized distributors?
All TL432AQDBZRG4 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 TL432AQDBZRG4 meets industry standards.
7.What is the process for return or replacement of TL432AQDBZRG4?
All TL432AQDBZRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL432AQDBZRG4, 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 TL432AQDBZRG4 part is unused and in its original packaging.
Return procedure for TL432AQDBZRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432AQDBZRG4 Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
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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
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