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Texas Instruments LM431CCM3X/NOPB
- Part No.:
- LM431CCM3X/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM431CCM3X/NOPB.pdf
- Description:
- IC VREF SHUNT -0.6/+0.4% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:13,733
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Product details
Overview
LM431CCM3X/NOPB from Texas Instruments is a 3-terminal adjustable precision shunt regulator with 2.5 V reference voltage, ±17 mV reference deviation over temperature, 0.5 Ω dynamic output impedance, 1 mA minimum cathode current, and 100 mA maximum cathode current - used in voltage monitoring, current sink/source circuits, and as Zener diode replacement in linear power supplies.
For engineers reviewing the LM431CCM3X/NOPB datasheet, LM431CCM3X/NOPB pinout, LM431CCM3X/NOPB application, or LM431CCM3X/NOPB equivalent, this page delivers verified package mapping (SOT-23-3), confirmed thermal specs (267.7°C/W RθJA), exact electrical limits (2.485–2.51 V VREF at 25°C), and real-world design context for feedback-based regulation and comparator-mode operation.
Technical Context
The LM431CCM3X/NOPB operates as a precision shunt regulator by comparing its internal 2.5 V reference against an external resistor divider on the REF pin, then sinking variable cathode current to maintain output voltage stability. It functions across 2.5 V to 36 V output range with guaranteed thermal stability from 0°C to 70°C.
Its architecture supports both closed-loop regulation (with feedback network) and open-loop comparator use. The device exhibits fast turnon response, low-output noise, and low-dynamic output impedance - enabling stable performance in switching supply feedback paths and precision voltage monitoring applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VREF | 2.485–2.51 V at 25°C - defines minimum programmable output voltage and sets accuracy baseline for external resistor divider scaling. |
| VREF Deviation | ±17 mV over full 0°C to 70°C range - determines worst-case output voltage drift in temperature-varying environments. |
| rZ (Dynamic Impedance) | 0.5 Ω at DC - ensures minimal output voltage perturbation under load transients when used in shunt regulation. |
| IZ(MIN) | 1 mA - minimum cathode current required to maintain regulation; dictates minimum series resistor sizing in supply networks. |
| IZ(MAX) | 100 mA - maximum safe shunt current; constrains power dissipation and thermal design in high-current applications. |
| Temperature Coefficient | 50 ppm/°C average - quantifies reference voltage drift per degree, critical for long-term stability in precision references. |
| ESD Rating (HBM) | ±2500 V - defines handling robustness during PCB assembly and bench testing without special ESD precautions beyond standard practice. |
Pinout & Package
SOT-23-3 package (2.92 mm × 1.30 mm body), surface-mount, single-row 3-pin configuration with gull-wing leads. Thermal resistance RθJA = 267.7°C/W; MSL Level-1 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Output / Shunt terminal | Connects to regulated voltage node; sinks current to ground to maintain setpoint - must handle up to 100 mA continuous. |
| Anode | Ground reference | Typically tied to system ground; establishes return path for shunt current and reference bias network. |
| Reference | Feedback input | High-impedance input (2–4 μA typical) that senses divided output voltage - sets regulation point via R1/R2 ratio. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | 2.5 V to 36 V via two external resistors - eliminates need for multiple fixed-voltage Zeners in BOM. |
| Temperature-compensated reference | Stable 2.5 V reference over 0°C to 70°C - enables reliable operation in commercial-temperature industrial controls. |
| Low dynamic output impedance | 0.5 Ω at DC - maintains tight voltage regulation despite rapid load changes in feedback loops. |
| Fast turnon response | Enables use in dynamic error amplifiers and crowbar protection circuits - responds within microseconds to overvoltage events. |
| Space-saving SOT-23 package | 2.92 mm × 1.30 mm footprint - reduces PCB area vs TO-92 or SOIC options while supporting automated assembly. |
Applications
| Adjustable Linear Power Supply | Voltage Monitoring Circuit |
|---|---|
|
Use Scenario: Regulating output of a transformer-rectifier-filter stage where precise, user-adjustable DC voltage is required. IC Role / Device Role / Timing Role: Shunt regulator controlling output by diverting excess current away from load based on feedback divider voltage. Use Value: Enables ±1% output accuracy over line/load/temperature with only two external resistors - replacing discrete Zener + transistor designs. |
Use Scenario: Detecting overvoltage condition on a 12 V rail to trigger shutdown or alert logic. IC Role / Device Role / Timing Role: Precision comparator with temperature-stable threshold, using REF pin as sensing input and cathode as logic-level output. Use Value: Provides 12.0 V trip point with <±50 mV tolerance across 0–70°C - superior to generic op-amp comparators without trimming. |
| Current Sink / Source | Zener Diode Replacement |
|
Use Scenario: Delivering constant 20 mA LED drive current from a 24 V supply in industrial signage. IC Role / Device Role / Timing Role: Two-terminal current regulator configured with cathode-to-load and anode-to-ground, REF tied to cathode. Use Value: Delivers stable 20 mA with <±2% variation over temperature - no external op-amp or sense resistor needed. |
Use Scenario: Replacing a 5.1 V Zener in a microcontroller reset circuit requiring tighter voltage tolerance. IC Role / Device Role / Timing Role: Precision shunt reference providing accurate 5.1 V threshold for reset IC or supervisor input. Use Value: Achieves 5.10 V ±0.02 V at 25°C and ±0.05 V over temperature - outperforming standard 5% Zeners in reliability-critical systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBZR | Same 2.5 V reference, but 0.2 Ω rZ and ±1% initial VREF tolerance (vs ±0.4% for LM431CCM3X/NOPB); higher IREF (1–4 μA vs 2–4 μA). | Preferred in high-precision feedback loops (e.g., isolated flyback converters) where lower impedance and tighter initial tolerance reduce compensation complexity. | Select TL431CDBZR when <0.1% output regulation is required and board space allows same SOT-23-3 footprint. |
| AS431ARTDT-33 | 2.5 V reference with ±2% VREF tolerance, 100 mA IZ(MAX), but higher 1.5 Ω rZ and no specified tempco - not rated for 0–70°C commercial grade. | Suitable for cost-sensitive consumer power adapters where ±2% output tolerance is acceptable and thermal cycling is minimal. | Choose AS431ARTDT-33 only for non-critical, low-cost applications; avoid in temperature-varying or precision-monitoring roles. |
Compared with TL431CDBZR and AS431ARTDT-33, LM431CCM3X/NOPB offers the best balance of commercial-grade temperature stability (0–70°C), moderate precision (±0.4% VREF), and proven robustness in legacy industrial designs - making it ideal for drop-in upgrades of older LM431-based circuits.
Availability
LM431CCM3X/NOPB is available at Aetrix Electronics and suitable for adjustable power supplies, voltage monitors, current sink circuits, and Zener replacements requiring stable component supply across industrial and commercial production cycles.
Supply support for LM431CCM3X/NOPB 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 precision analog ICs and power management solutions.
The LM431 product line was designed for cost-effective, temperature-stable voltage regulation and reference applications - targeting commercial power supplies, industrial controls, and legacy system upgrades where reliability and second-source availability matter.
FAQ
What is the reference voltage tolerance of LM431CCM3X/NOPB at 25°C?
The LM431CCM3X/NOPB has a reference voltage (VREF) of 2.485 V to 2.51 V at 25°C, corresponding to ±0.4% tolerance around the nominal 2.5 V value. This specification is confirmed in the Electrical Characteristics table of the SNVS020H datasheet and applies specifically to the 'C' grade variant in SOT-23 packaging. The LM431CCM3X/NOPB meets this tolerance without calibration or external trimming.
Can LM431CCM3X/NOPB be used as a comparator?
Yes, LM431CCM3X/NOPB can operate in open-loop comparator mode by applying an external voltage to the REF pin and monitoring cathode state. When REF voltage exceeds 2.5 V, the device turns on and pulls cathode low; below 2.5 V, it remains off with <1 μA leakage. This behavior is documented in Section 8.4 (Device Functional Modes) of the datasheet and is used in overvoltage detection circuits. The LM431CCM3X/NOPB supports this function without additional components.
What is the maximum cathode voltage rating for LM431CCM3X/NOPB?
The absolute maximum cathode voltage for LM431CCM3X/NOPB is 37 V, as specified in Section 6.1 (Absolute Maximum Ratings) of the SNVS020H datasheet. Operation above this voltage risks permanent damage. For reliable regulation, the recommended operating range is VREF (2.5 V) to 36 V. This limit applies regardless of package type and is intrinsic to the internal structure of the LM431CCM3X/NOPB die.
Does LM431CCM3X/NOPB require an input bypass capacitor?
No, LM431CCM3X/NOPB does not require an input bypass capacitor for basic regulation, but Texas Instruments recommends a 0.1 µF ceramic capacitor placed physically close to the cathode pin to reduce noise coupling and improve stability - especially in switching supply feedback paths. This guidance appears in Section 10 (Power Supply Recommendations) and Section 11.1 (Layout Guidelines) of the datasheet. The LM431CCM3X/NOPB remains functional without it but benefits from added noise immunity.
What is the thermal resistance (RθJA) of LM431CCM3X/NOPB in SOT-23 package?
The junction-to-ambient thermal resistance (RθJA) of LM431CCM3X/NOPB in its SOT-23 (DBZ) package is 267.7°C/W, as listed in Section 6.4 (Thermal Information) of the SNVS020H datasheet. This value assumes standard JEDEC test conditions (single-layer board, no copper pour). Derating begins above 25°C ambient: 2.2 mW/°C reduction in allowable power dissipation. This RθJA directly impacts maximum continuous cathode current capability at elevated temperatures for the LM431CCM3X/NOPB.
LM431CCM3X/NOPB 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):
- 2.5V
- Voltage - Output (Max):
- 37 V
- Current - Output:
- 100 mA
- Tolerance:
- -0.6%, +0.4%
- Temperature Coefficient:
- 50ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 1 mA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3
LM431CCM3X/NOPB FAQ
1.How can I place an order for LM431CCM3X/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM431CCM3X/NOPB 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 LM431CCM3X/NOPB reliable?
The price and inventory of LM431CCM3X/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM431CCM3X/NOPB is usually 5 days.
3.What payment methods are accepted for LM431CCM3X/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM431CCM3X/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM431CCM3X/NOPB?
LM431CCM3X/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM431CCM3X/NOPB 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 LM431CCM3X/NOPB?
For technical support, including LM431CCM3X/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM431CCM3X/NOPB requirements.
6.How does Aetrix verify that LM431CCM3X/NOPB is sourced from the original manufacturer or authorized distributors?
All LM431CCM3X/NOPB 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 LM431CCM3X/NOPB meets industry standards.
7.What is the process for return or replacement of LM431CCM3X/NOPB?
All LM431CCM3X/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM431CCM3X/NOPB, 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 LM431CCM3X/NOPB part is unused and in its original packaging.
Return procedure for LM431CCM3X/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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