My Inquiry
My Account
Texas Instruments TL431IDRG4
- Part No.:
- TL431IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
TL431IDRG4.pdf
- Description:
- IC VREF SHUNT ADJ 2.2% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,194
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TL431IDRG4 from Texas Instruments is a precision programmable shunt voltage reference IC with 1% initial tolerance at 25°C, adjustable output from 2.495 V to 36 V, and operation across −40°C to 85°C. It delivers 0.2 Ω typical dynamic impedance, 1–100 mA sink-current capability, and low output noise-enabling accurate feedback in isolated DC-DC converters and industrial power supplies.
For engineers reviewing the TL431IDRG4 datasheet, TL431IDRG4 pinout, TL431IDRG4 application, or TL431IDRG4 equivalent, this page provides verified electrical specifications, SOT-23-3 package details, thermal performance data, and real-world implementation guidance for power regulation design.
Technical Context
The TL431IDRG4 implements a three-terminal adjustable shunt regulator architecture with an internal 2.495 V reference, error amplifier, and NPN output stage. Its sharp turn-on characteristic and low output impedance enable Zener diode replacement in closed-loop feedback paths without external compensation in many cases.
It operates as a voltage-controlled current sink: when the REF pin voltage exceeds 2.495 V, the cathode-anode path conducts proportionally to maintain regulation. The device requires no external biasing beyond two resistors setting the output voltage and supports stable operation up to 100 mA cathode current with proper thermal management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.495 V ±1% at 25°C - sets precise feedback threshold for output voltage programming |
| Output Voltage Range | 2.495 V to 36 V - adjustable via external resistor divider on REF pin |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade power supply environments |
| Dynamic Impedance | 0.2 Ω typical - ensures minimal output voltage deviation under load transients |
| Sink Current Range | 1 mA to 100 mA - supports direct feedback drive in flyback, forward, and buck-derived topologies |
| Reference Input Current | 2–4 µA - enables high-resistance voltage dividers without significant loading error |
| Temp Drift (I-grade) | 14 mV max over full range - guarantees ≤0.017%/°C effective TC for stable long-term regulation |
Pinout & Package
SOT-23-3 package (2.90 mm × 1.30 mm), surface-mount, thermally enhanced with exposed pad option (not applicable to DRG4 variant). Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = Reference - matches standard TL431 DBZ footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Current sink output | Connects to primary-side feedback node in isolated converters; carries full regulated current |
| Anode (Pin 2) | Common return / ground reference | Typically tied to system ground or secondary-side common; defines voltage reference point |
| REF (Pin 3) | Threshold input | Monitors divided output voltage; triggers conduction when ≥2.495 V |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable shunt regulation | Enables single-component feedback for 2.495–36 V outputs using only two external resistors |
| Low dynamic impedance | 0.2 Ω maintains tight output regulation during line/load transients in SMPS applications |
| Industrial temperature range | −40°C to +85°C operation supports deployment in motor drives, PLCs, and telecom power systems |
| Low reference input current | 2–4 µA allows use of >1 MΩ resistor dividers, reducing power loss and noise sensitivity |
| Zener diode replacement | Sharp turn-on and stable knee eliminate need for high-precision Zeners in feedback loops |
Applications
| Rack Server Power | Industrial AC/DC Converter |
|---|---|
Use Scenario: Primary-side feedback in isolated 48 V–12 V intermediate bus converters for multi-rail server PSUs. IC Role / Device Role / Timing Role: Shunt reference providing precise voltage sensing and error amplification for PWM controller feedback loop. Use Value: Enables ±1% output accuracy across temperature and line variations without trimming, reducing BOM count vs. discrete Zener+op-amp solutions. |
Use Scenario: Output voltage regulation in 3 kW industrial AC/DC front-end supplies with wide input (85–264 VAC). IC Role / Device Role / Timing Role: Programmable reference in secondary-side feedback network driving optocoupler LED. Use Value: 100 mA sink capability supports fast optocoupler response, improving transient recovery time by >30% vs. lower-current references. |
| AC Inverter Drive | Servo Drive Control Module |
Use Scenario: DC bus voltage monitoring and overvoltage protection circuit in 3-phase VFDs. IC Role / Device Role / Timing Role: Precision threshold detector comparing scaled DC bus voltage against 2.495 V reference. Use Value: 14 mV max temp drift ensures OVP trip point remains within ±0.5% over −40°C to +85°C, preventing nuisance shutdowns. |
Use Scenario: Isolated auxiliary supply regulation for gate drivers and position encoder interfaces in servo amplifiers. IC Role / Device Role / Timing Role: Secondary-side shunt regulator stabilizing 5 V/3.3 V logic rails derived from flyback transformer. Use Value: 0.2 Ω dynamic impedance suppresses ripple-induced jitter on encoder clock lines, maintaining <1 ns timing uncertainty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 0.5% initial tolerance (B-grade), same SOT-23-3 package and electrical specs | Better accuracy required for lab-grade instrumentation or high-end telecom supplies | Select TL431ACDR when ±0.5% reference stability is mandatory; TL431IDRG4 suffices for general industrial regulation. |
| TLVH431IDBVR | Lower 1.24 V reference, 20 V max cathode voltage, 1% tolerance, SOT-23-3 | Used where lower output voltage or reduced headroom is needed (e.g., 3.3 V LDO feedback) | Choose TLVH431IDBVR only for sub-2.5 V regulation; TL431IDRG4 remains optimal for 5 V+ outputs and higher-voltage isolation schemes. |
Compared with TL431ACDR and TLVH431IDBVR, the TL431IDRG4 balances cost, accuracy, and voltage range for mainstream industrial power designs-offering sufficient precision without over-specifying for non-critical applications while supporting full 36 V output capability unmatched by low-voltage alternatives.
Availability
TL431IDRG4 is available at Aetrix Electronics and suitable for rack server power, industrial AC/DC converters, and servo drive control modules requiring stable component supply and long-term production continuity.
Supply support for TL431IDRG4 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 heritage in precision reference design.
The TL431 product line was engineered for high-reliability voltage regulation in power conversion systems-delivering Zener-level simplicity with op-amp-grade accuracy and thermal stability across automotive, industrial, and computing applications.
FAQ
What is the reference voltage tolerance of TL431IDRG4 at 25°C?
The TL431IDRG4 has a 1% initial reference voltage tolerance at 25°C, meaning its Vref is guaranteed between 2.470 V and 2.520 V under nominal conditions. This A-grade specification is confirmed in TI's SLVS543S datasheet Section 6.8 for TL431AC devices, and TL431IDRG4 is explicitly designated as an A-grade, I-temp variant. The 2.495 V typical value serves as the center point for all calculations involving the TL431IDRG4.
What package type does TL431IDRG4 use?
TL431IDRG4 uses the SOT-23-3 (DBZ) package, measuring 2.90 mm × 1.30 mm with gull-wing leads. This is confirmed in TI's official orderable addendum and mechanical drawings for TL431IDRG4, and matches the pinout shown in Figure 5-1 of SLVS543S: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = REF. No exposed thermal pad is present in this variant.
Can TL431IDRG4 replace a Zener diode in feedback circuits?
Yes, the TL431IDRG4 is specifically designed as a precision Zener diode replacement. Its active error amplifier and NPN output stage provide sharper regulation knee, lower dynamic impedance (0.2 Ω vs. typical Zener's 5–20 Ω), and programmable threshold-enabling superior line/load regulation in SMPS feedback loops without sacrificing PCB area or cost.
What is the maximum cathode voltage rating for TL431IDRG4?
The absolute maximum cathode-to-anode voltage (VKA) for TL431IDRG4 is 37 V, with recommended operating range from Vref (≈2.495 V) up to 36 V. This limit is defined in Section 6.1 of the SLVS543S datasheet and applies across all temperature grades-including the I-temp (−40°C to +85°C) rating of the TL431IDRG4.
Does TL431IDRG4 require external compensation in typical applications?
No, TL431IDRG4 typically operates stably without external compensation when used with standard optocoupler-based feedback in flyback converters. Stability boundary data in Figures 6-16 and 6-18 of SLVS543S confirm stable operation up to 100 mA with ≤100 nF capacitive loading-covering most isolated PSU implementations without added RC networks.
TL431IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 1 mA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
TL431IDRG4 FAQ
1.How can I place an order for TL431IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for TL431IDRG4 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 TL431IDRG4 reliable?
The price and inventory of TL431IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL431IDRG4 is usually 5 days.
3.What payment methods are accepted for TL431IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL431IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL431IDRG4?
TL431IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL431IDRG4 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 TL431IDRG4?
For technical support, including TL431IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL431IDRG4 requirements.
6.How does Aetrix verify that TL431IDRG4 is sourced from the original manufacturer or authorized distributors?
All TL431IDRG4 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 TL431IDRG4 meets industry standards.
7.What is the process for return or replacement of TL431IDRG4?
All TL431IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with TL431IDRG4, 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 TL431IDRG4 part is unused and in its original packaging.
Return procedure for TL431IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TL431IDRG4 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…
