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Texas Instruments TL432QDBZR
- Part No.:
- TL432QDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
TL432QDBZR.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,887
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Product details
Overview
TL432QDBZR from Texas Instruments is a precision programmable shunt voltage reference in SOT-23-3 package, delivering 2.495 V nominal reference voltage with ±0.5% initial tolerance (B grade), 14 mV max temperature drift over −40°C to 125°C, 0.2 Ω typical dynamic impedance, and 1–100 mA sink-current capability. It serves as a stable feedback element in isolated DC/DC converters and industrial power supplies.
For engineers reviewing the TL432QDBZR datasheet, TL432QDBZR pinout, TL432QDBZR application, or TL432QDBZR equivalent, key selection criteria include automotive-grade temperature range (−40°C to 125°C), low-output-impedance regulation, adjustable output from 2.5 V to 36 V via two external resistors, and compatibility with flyback and forward converter feedback loops.
Technical Context
The TL432QDBZR implements a three-terminal adjustable shunt regulator architecture with an internal error amplifier, reference, and NPN output stage. Its sharp turn-on characteristic and active output circuitry enable precise voltage regulation without external compensation in most applications.
Unlike the TL431, the TL432QDBZR uses a distinct pinout (CATHODE–REF–ANODE) in the SOT-23-3 package, requiring PCB layout revision when substituting. It shares identical electrical specifications with TL431Q variants but is not pin-compatible.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V nominal (2.483–2.507 V for B grade at 25°C); sets precise feedback threshold in closed-loop power supplies. |
| Initial Tolerance | ±0.5% at 25°C (B grade); enables high-accuracy output regulation without post-manufacturing trimming. |
| Temp Range | −40°C to +125°C (Q grade); qualified for under-hood automotive and industrial control environments. |
| Temp Drift | ≤14 mV over full temperature range; ensures ≤0.56% output variation across operating extremes. |
| Dynamic Impedance | 0.2 Ω typical; maintains stable regulation under fast load transients and high-frequency ripple. |
| Sink Current | 1–100 mA continuous; supports direct interface with optocoupler LEDs in isolated feedback paths. |
| Output Noise | Low broadband noise (typ. 220 nV/√Hz @ 1 kHz); minimizes jitter in sensitive analog control loops. |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, RoHS-compliant. Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 1) | Shunt current input / voltage sensing node | Connects to switched-node side of optocoupler LED or directly to regulated output; sinks current to maintain reference accuracy. |
| REF (Pin 2) | Reference input threshold | Internal 2.495 V comparator input; tied to resistor divider midpoint to set output voltage (VOUT = VREF × (1 + R1/R2)). |
| ANODE (Pin 3) | Common return / ground reference | Typically connected to system ground or power supply return; defines reference potential for all internal circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.5 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage references in multi-rail systems. |
| Sharp turn-on characteristic | Fast response to voltage deviations (<1 µs pulse rise time) - improves transient regulation in switching supplies. |
| Low output impedance | 0.2 Ω typical - suppresses output perturbations caused by optocoupler CTR variation or PCB trace inductance. |
| Automotive temperature grade | Qualified for −40°C to +125°C operation - meets AEC-Q100 stress test requirements for engine control modules. |
| Low reference input current | 2–4 µA typical - reduces divider network power loss and resistor self-heating errors in high-impedance designs. |
Applications
| Industrial AC/DC Power Supply | Rack Server Power |
|---|---|
Use Scenario: Primary-side feedback in 80 PLUS Titanium-certified 1.5 kW server PSUs using SiC MOSFETs and digital controllers. IC Role / Device Role / Timing Role: Shunt reference providing precise 12 V output regulation via optocoupler-coupled feedback loop. Use Value: Enables <±0.5% output accuracy across line/load/temp, meeting strict server rail tolerance specs without secondary-side sensing. |
Use Scenario: Secondary-side voltage monitoring in redundant 48 V intermediate bus converters feeding CPU/GPU VRMs. IC Role / Device Role / Timing Role: Precision reference for analog supervisor ICs detecting overvoltage/undervoltage faults. Use Value: Guarantees fault detection threshold stability within ±10 mV over temperature, preventing false shutdowns during thermal cycling. |
| AC Inverter & VF Drives | Servo Drive Control Module |
Use Scenario: DC bus voltage scaling and feedback in 3-phase 22 kW industrial inverters with IGBT gate drivers. IC Role / Device Role / Timing Role: High-stability reference for ADC input scaling and analog protection comparators. Use Value: Maintains <0.1% measurement linearity from −40°C startup to 125°C steady-state, ensuring torque accuracy and safe shutdown. |
Use Scenario: Isolated current-sense amplifier reference in dual-axis servo drives with resolver feedback. IC Role / Device Role / Timing Role: Stable bias source for instrumentation amplifiers measuring motor phase currents. Use Value: Limits current-sense offset drift to <50 µV/°C, preserving <0.2% torque resolution across full ambient range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431QDBZR | Same electrical specs and Q-temp rating, but TL431 pinout (CATHODE–ANODE–REF) in SOT-23-3; requires PCB redesign. | Direct functional replacement only if board layout accommodates reversed REF/ANODE pins. | Select TL431QDBZR only when reusing legacy TL431-based layouts; TL432QDBZR avoids pinout conflict in new designs. |
| MAX6008AEUR+T | Fixed 2.5 V output, ±0.2% initial accuracy, 30 ppm/°C tempco, 10 µA max quiescent current; no adjustability. | Suitable for non-adjustable, ultra-low-power references where 2.5 V suffices and drift budget is tighter. | Choose MAX6008AEUR+T for battery-powered sensors needing minimal current draw; TL432QDBZR preferred for adjustable, high-current power feedback. |
Compared with TL431QDBZR, TL432QDBZR eliminates pinout-induced layout errors in new designs; versus MAX6008AEUR+T, it trades fixed-accuracy for wide-range adjustability and higher sink capability-critical for isolated power regulation.
Availability
TL432QDBZR is available at Aetrix Electronics and suitable for industrial AC/DC power supplies, rack server power units, and servo drive control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for TL432QDBZR 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 technologies, with decades of expertise in precision reference design.
The TL43x family was engineered for high-reliability voltage regulation in power conversion systems, targeting automotive, industrial, and computing applications demanding tight tolerance and wide-temperature stability.
FAQ
What is the exact pin configuration of TL432QDBZR?
The TL432QDBZR uses a SOT-23-3 package with Pin 1 = CATHODE, Pin 2 = REF, Pin 3 = ANODE. This differs from TL431 variants (CATHODE–ANODE–REF), so direct substitution requires PCB layout modification. The pinout is confirmed in TI's SLVS543S datasheet Figure 5, page 4.
Does TL432QDBZR support adjustable output voltages above 30 V?
Yes, TL432QDBZR supports adjustable output from 2.5 V up to 36 V using two external resistors per the standard feedback equation VOUT = VREF × (1 + R1/R2). At 36 V cathode voltage, it maintains regulation with ≤100 mA sink current and remains within absolute maximum ratings.
How does the temperature drift of TL432QDBZR compare to commercial-grade TL432 variants?
TL432QDBZR exhibits ≤14 mV total deviation over −40°C to +125°C, whereas TL432C (0°C to 70°C) is rated at ≤6 mV. The Q-grade drift reflects wider thermal excursion, not inferior performance-it meets automotive qualification requirements with verified stability across the full range.
Can TL432QDBZR replace a Zener diode in high-precision applications?
Yes, TL432QDBZR replaces Zener diodes in precision applications due to its 0.5% initial tolerance, 0.2 Ω dynamic impedance, and sharp turn-on. Unlike Zeners, it delivers stable regulation independent of current variation and offers predictable temperature behavior-verified in TI's Figure 6-1 and 6-5.
What is the minimum cathode current required for regulation in TL432QDBZR?
TL432QDBZR requires ≥0.4 mA minimum cathode current (Imin) to maintain regulation, per Section 6.7 of the datasheet. Below this threshold, the device exits active regulation and output voltage rises toward cathode potential-critical for optocoupler LED biasing in low-load conditions.
TL432QDBZR 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:
- 100 mA
- Tolerance:
- ±2.2%
- 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
TL432QDBZR FAQ
1.How can I place an order for TL432QDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for TL432QDBZR 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 TL432QDBZR reliable?
The price and inventory of TL432QDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL432QDBZR is usually 5 days.
3.What payment methods are accepted for TL432QDBZR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL432QDBZR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL432QDBZR?
TL432QDBZR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL432QDBZR 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 TL432QDBZR?
For technical support, including TL432QDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL432QDBZR requirements.
6.How does Aetrix verify that TL432QDBZR is sourced from the original manufacturer or authorized distributors?
All TL432QDBZR 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 TL432QDBZR meets industry standards.
7.What is the process for return or replacement of TL432QDBZR?
All TL432QDBZR units undergo pre-shipment inspection (PSI). If there is an issue with TL432QDBZR, 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 TL432QDBZR part is unused and in its original packaging.
Return procedure for TL432QDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL432QDBZR Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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