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Texas Instruments ATL432EBQDBZR
- Part No.:
- ATL432EBQDBZR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
ATL432EBQDBZR.pdf
- Description:
- IC VREF SHUNT 2.5V SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,399
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Product details
Overview
ATL432EBQDBZR from Texas Instruments is a 2.5V adjustable precision shunt regulator in SOT-23 package, designed for secondary-side voltage regulation in isolated flyback converters. It delivers 0.5% initial reference voltage tolerance at 25°C, supports cathode current from 35µA to 100mA, exhibits ≤0.3Ω dynamic impedance, and operates across –40°C to +125°C for automotive-grade reliability.
For engineers reviewing the ATL432EBQDBZR datasheet, ATL432EBQDBZR pinout, ATL432EBQDBZR application, or ATL432EBQDBZR equivalent, this device serves as a low-IQ Zener replacement with stable open-loop comparator and closed-loop shunt regulation modes - critical for power isolation, adjustable referencing, and no-load efficiency in SMPS designs.
Technical Context
The ATL432EBQDBZR implements an internally compensated error amplifier with integrated 2.5V bandgap reference, enabling stable operation without external capacitance. Its Darlington output stage provides sharp turn-on and sink-current control based on REF-to-ANODE differential voltage.
It operates in two distinct functional modes: open-loop comparator (for voltage monitoring) and closed-loop shunt regulator (for feedback in isolated supplies). Cathode voltage range spans 2.5V–36V, with minimum regulation current fixed at 35µA (max), and reference input current capped at 150nA (max).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF tolerance | ±0.5% at 25°C - ensures tight initial setpoint accuracy for high-precision feedback loops |
| Temp range | –40°C to +125°C (Q grade) - qualified for under-hood automotive and industrial environments |
| IK(min) | 35µA max - enables ultra-low standby power in flyback PSUs with <100µA no-load consumption |
| |zKA| | ≤0.3Ω - maintains stable regulation under fast load transients up to 100mA |
| IREF | ≤150nA - minimizes resistor-divider error and enables high-impedance feedback networks |
| Voltage range | 2.5V to 36V - programmable output via two external resistors, supporting wide-input DC/DC topologies |
| Stability | No external capacitor required - simplifies layout and eliminates ESR sensitivity in isolated feedback paths |
Pinout & Package
ATL432EBQDBZR uses a 3-pin SOT-23 (DBZ) package, 2.90mm × 1.60mm nominal body size, with thermal resistance RθJA = 331.8°C/W. Pin functions are validated per TI SLVSCV5E datasheet Figure 4-2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - REF | Reference input | Senses voltage relative to ANODE; requires ≥0.1µA bias current for proper NPN base drive |
| 2 - CATHODE | Shunt current output | Sinks regulated current to maintain VREF; connects to optocoupler LED or feedback divider midpoint |
| 3 - ANODE | Common return | Typically grounded in non-isolated circuits; serves as voltage reference point for REF and VKA measurements |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output range | 2.5V–36V via two external resistors - replaces multiple Zener diodes with single BOM item |
| Low IQ operation | 35µA min cathode current - cuts no-load power loss by >20× vs TL431 in standby mode |
| Temperature drift | 6mV over –40°C to +125°C - ensures ±0.024% output stability across full automotive range |
| Dynamic impedance | 0.05Ω typical - sustains regulation during rapid load steps without external compensation |
| ESD robustness | ±2000V HBM - withstands handling and board assembly without protection circuitry |
Applications
| Secondary-Side Regulation | Overvoltage Monitoring |
|---|---|
Use Scenario: Isolated 24V flyback converter with optocoupler feedback loop. IC Role / Device Role / Timing Role: Shunt regulator and error amplifier - compares sampled output voltage against internal 2.5V reference and drives optocoupler LED current. Use Value: Enables precise output regulation (<±1%) across line/load/temperature while reducing no-load power by >20× versus legacy TL431. |
Use Scenario: Microcontroller supply rail monitoring for brown-out detection. IC Role / Device Role / Timing Role: Open-loop comparator - triggers reset when input exceeds 3.3V threshold set by resistor divider. Use Value: Integrates accurate 2.5V reference and high-gain amplifier in one device, eliminating external voltage reference IC and op-amp. |
| Adjustable Current Reference | Zener Diode Replacement |
Use Scenario: Programmable LED driver with constant-current setpoint. IC Role / Device Role / Timing Role: Precision shunt reference - sets current-sense voltage across sense resistor via REF pin feedback. Use Value: Achieves <0.5% current accuracy over temperature using only two resistors and no trimming. |
Use Scenario: 5V LDO pre-regulator with coarse voltage clamping. IC Role / Device Role / Timing Role: Adjustable shunt clamp - regulates input to 5.0V using R1=10kΩ, R2=10kΩ network. Use Value: Replaces discrete 5.1V Zener with superior tempco (6mV vs >50mV), lower leakage (<0.2µA), and tighter tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431BIDBZR | 1% VREF tolerance, –40°C to +85°C operation, higher IK(min) = 100µA | Limited to commercial/industrial temp range; unsuitable for under-hood automotive use | Select when cost sensitivity outweighs temp range and no-load power requirements |
| ATL431EBQDBZR | Identical electrical specs and Q-grade temp range, but REF and CATHODE pins swapped (pin 1/2 reversed) | Requires PCB layout revision - not drop-in compatible due to pinout mismatch | Choose only if redesigning layout to accommodate ATL431's alternate pin configuration |
Compared with TL431BIDBZR, ATL432EBQDBZR delivers 20× lower minimum cathode current and extended temperature range - essential for automotive isolation and ultra-low-power standby. Against ATL431EBQDBZR, it offers identical performance but avoids layout rework due to matching DBZ pinout.
Availability
ATL432EBQDBZR is available at Aetrix Electronics and suitable for automotive power systems, industrial flyback converters, and portable device battery management requiring stable component supply with guaranteed long-term availability.
Supply support for ATL432EBQDBZR 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 delivering analog and embedded processing solutions, with leadership in power management, signal chain, and automotive electronics.
ATL432EBQDBZR belongs to TI's advanced shunt regulator product line, engineered specifically to replace TL431 in automotive and high-reliability isolated power supplies where low IQ, extended temperature range, and stable no-capacitor operation are mandatory.
FAQ
What is the operating temperature range of ATL432EBQDBZR?
The ATL432EBQDBZR is rated for operation from –40°C to +125°C, meeting automotive-grade Q-temperature specifications. This range is confirmed in Section 5.3 of the TI SLVSCV5E datasheet and applies across all electrical characteristics including VREF tolerance, IK(min), and dynamic impedance. The "Q" suffix in ATL432EBQDBZR explicitly denotes this extended qualification.
How does ATL432EBQDBZR differ from TL431 in no-load performance?
ATL432EBQDBZR reduces minimum cathode current for regulation to 35µA (max), which is >20× lower than TL431's 100µA requirement. This directly enables sub-100µA no-load input power in flyback converters - a key advantage verified in TI application report SLVA685. The ATL432EBQDBZR achieves this via optimized Darlington output stage and lower reference bias current.
Can ATL432EBQDBZR be used without an output capacitor?
Yes - ATL432EBQDBZR is internally compensated and stable with zero output capacitance between CATHODE and ANODE, as stated in Section 1 Features and validated in Figures 5-14 through 5-21 of the datasheet. This eliminates ESR sensitivity and simplifies feedback design in optocoupler-based isolated supplies, unlike TL431 which often requires careful capacitor selection.
What is the maximum cathode voltage rating for ATL432EBQDBZR?
The absolute maximum cathode-to-anode voltage (VKA) for ATL432EBQDBZR is 40V, per Section 5.1 Absolute Maximum Ratings in the TI SLVSCV5E datasheet. Continuous operation is recommended up to 36V, aligning with its specified adjustable output range. Exceeding 40V risks permanent damage regardless of current level.
Is ATL432EBQDBZR pin-compatible with ATL431EBQDBZR?
No - ATL432EBQDBZR and ATL431EBQDBZR share identical electrical specs and Q-grade temperature range but feature reversed REF and CATHODE pins in the SOT-23 (DBZ) package. As shown in Figures 4-1 and 4-2 of the datasheet, ATL432EBQDBZR has REF on pin 1 and CATHODE on pin 2, whereas ATL431EBQDBZR swaps these. PCB layout must be modified for substitution.
ATL432EBQDBZR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 36 V
- Current - Output:
- 100 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 92ppm/°C
- 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
ATL432EBQDBZR FAQ
1.How can I place an order for ATL432EBQDBZR through Aetrix?
Please submit a Request for Quotation (RFQ) for ATL432EBQDBZR 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 ATL432EBQDBZR reliable?
The price and inventory of ATL432EBQDBZR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATL432EBQDBZR is usually 5 days.
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Once your ATL432EBQDBZR 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 ATL432EBQDBZR?
For technical support, including ATL432EBQDBZR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATL432EBQDBZR requirements.
6.How does Aetrix verify that ATL432EBQDBZR is sourced from the original manufacturer or authorized distributors?
All ATL432EBQDBZR 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 ATL432EBQDBZR meets industry standards.
7.What is the process for return or replacement of ATL432EBQDBZR?
All ATL432EBQDBZR units undergo pre-shipment inspection (PSI). If there is an issue with ATL432EBQDBZR, 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 ATL432EBQDBZR part is unused and in its original packaging.
Return procedure for ATL432EBQDBZR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATL432EBQDBZR 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
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
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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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