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Texas Instruments LM431CCM3/NOPB
- Part No.:
- LM431CCM3/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
LM431CCM3/NOPB.pdf
- Description:
- IC VREF SHUNT -0.6/+0.4% SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,876
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Product details
Overview
LM431CCM3/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 for regulation, and SOT-23-3 package. It replaces Zener diodes in voltage monitoring and linear power supply feedback circuits.
For engineers reviewing the LM431CCM3/NOPB datasheet, LM431CCM3/NOPB pinout, LM431CCM3/NOPB application, or LM431CCM3/NOPB equivalent, this page delivers verified electrical specs, thermal behavior, real-world shunt regulator design constraints, and validated alternative parts for commercial-temperature (0°C to 70°C) applications.
Technical Context
The LM431CCM3/NOPB implements an internal bandgap reference and transconductance amplifier driving an NPN output stage, enabling precise shunt regulation via external resistor divider feedback on the REF pin. Its operation requires ≥1 mA cathode current to maintain regulation and exhibits low 0.5 Ω dynamic impedance at DC.
It operates in closed-loop mode where REF senses output voltage through R1/R2, adjusting cathode current to hold VOUT = VREF × (1 + R1/R2). Thermal hysteresis arises from package stress, not circuit topology, and ESD rating is ±2500 V HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (VREF) | 2.485–2.51 V at 25°C; sets minimum programmable output at 2.5 V |
| Reference deviation over temp | ±17 mV across 0°C to 70°C; defines worst-case output error without trimming |
| Dynamic output impedance | 0.5 Ω typical at DC; ensures stable regulation under load transients up to 100 mA |
| Min cathode current (IZ(MIN)) | 0.4–1 mA; must be supplied externally to sustain regulation |
| Cathode voltage range | 2.5 V to 36 V; determines maximum output voltage when used as shunt regulator |
| Reference input current | 2–4 μA; loads feedback divider minimally, enabling high-resistance networks |
| ESD rating (HBM) | ±2500 V; requires standard handling but no special ESD protection circuitry |
Pinout & Package
SOT-23-3 package: 2.92 mm × 1.30 mm body, single-row 3-pin surface-mount outline with gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode | Output / Shunt current sink | Connects to regulated output node; carries total load + shunt current |
| Anode | Ground reference | Typically tied to system ground; defines return path for shunt current |
| Reference | Feedback sense input | Monitors output via resistor divider; triggers regulation when voltage exceeds VREF |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable output voltage | Programmable from 2.5 V to 36 V using two external resistors; eliminates need for multiple fixed Zeners |
| Low-reference-input current | 2–4 μA max; enables use of >1 MΩ feedback dividers without significant error |
| Temperature-compensated reference | Ensured stability over full 0°C to 70°C range; avoids external compensation components |
| Fast turn-on response | Enables use in overvoltage protection and crowbar circuits with sub-microsecond reaction |
| Low-output noise | Supports precision analog sensing and reference applications without added filtering |
Applications
| Switch-Mode Power Supply Feedback | Voltage Monitoring Circuit |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters. IC Role / Device Role / Timing Role: Shunt regulator providing optocoupler bias and error signal generation. Use Value: Enables accurate ±1% output regulation across line/load/temperature without transformer auxiliary winding. |
Use Scenario: Overvoltage detection in battery management systems. IC Role / Device Role / Timing Role: Precision threshold comparator triggering shutdown when cell voltage exceeds safe limit. Use Value: Delivers 2.5 V reference accuracy with <17 mV drift, eliminating calibration during production. |
| Current Sink for LED Driver | Zener Diode Replacement |
Use Scenario: Constant-current bias for high-brightness LEDs in automotive interior lighting. IC Role / Device Role / Timing Role: Adjustable shunt element setting LED current via sense resistor feedback. Use Value: Maintains stable current despite 12 V supply variation and ambient temperature shifts from −40°C to 85°C. |
Use Scenario: Voltage reference in legacy industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Drop-in replacement for 2.5 V Zener diodes with superior temperature stability. Use Value: Reduces reference drift from >100 ppm/°C (Zener) to 50 ppm/°C without board redesign. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431CDBVR | Same 2.5 V reference, ±25 mV temp drift (0°C–70°C), 0.22 Ω dynamic impedance, SOT-23-3 | Higher initial tolerance but tighter dynamic impedance; preferred for high-precision feedback loops | Select TL431CDBVR when <0.3 Ω output impedance is required and ±25 mV reference drift is acceptable |
| AS431ASTZTR-G1 | 2.5 V reference, ±20 mV temp drift (−40°C–85°C), 0.6 Ω dynamic impedance, SOT-23-3 | Wider temperature range; lower ESD rating (±2000 V HBM); RoHS-compliant lead finish | Choose AS431ASTZTR-G1 for extended temperature operation where 0.6 Ω impedance meets stability requirements |
Compared with LM431CCM3/NOPB, TL431CDBVR offers lower dynamic impedance for improved transient response but higher reference drift, while AS431ASTZTR-G1 supports −40°C operation at the cost of slightly higher impedance-both require identical PCB layout and feedback network design.
Availability
LM431CCM3/NOPB is available at Aetrix Electronics and suitable for switch-mode power supply feedback, voltage monitoring, LED current sinking, and Zener diode replacement applications requiring stable component supply across commercial temperature ranges.
Supply support for LM431CCM3/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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets.
The LM431 product line was designed as a precision, temperature-stable shunt regulator family to replace discrete Zener diodes in feedback, monitoring, and reference applications across commercial and industrial environments.
FAQ
What is the minimum cathode current required for LM431CCM3/NOPB to regulate?
The LM431CCM3/NOPB requires a minimum cathode current of 0.4–1 mA to maintain regulation, as specified in its Electrical Characteristics table. This current must be supplied externally through the series resistor between input and cathode. Below this threshold, the device exits regulation and output voltage collapses. Designers must ensure worst-case conditions-lowest input voltage and highest load current-still deliver ≥1 mA to the LM431CCM3/NOPB cathode.
Can LM431CCM3/NOPB be used in place of a standard 2.5 V Zener diode?
Yes, LM431CCM3/NOPB can directly replace a 2.5 V Zener diode in most applications, offering superior temperature stability (50 ppm/°C vs. >100 ppm/°C for Zeners) and lower dynamic impedance (0.5 Ω vs. 10–50 Ω). Unlike Zeners, it requires a reference connection and minimum cathode current, but needs no additional components for basic operation. Its SOT-23-3 footprint matches many Zener packages, simplifying board-level substitution.
What is the operating temperature range for LM431CCM3/NOPB?
The LM431CCM3/NOPB is rated for commercial temperature operation from 0°C to 70°C, as confirmed by TI's orderable addendum and Recommended Operating Conditions table. This range applies specifically to the "C" grade variant (LM431C), distinguishing it from "I" grade (−40°C to 85°C) versions like LM431CIM3/NOPB. Designs operating outside 0°C–70°C must select an appropriate grade variant.
How does the reference input current affect feedback resistor selection for LM431CCM3/NOPB?
The LM431CCM3/NOPB reference input current is 2–4 μA, which flows into the REF pin and biases the internal amplifier. This current creates voltage drop across the upper feedback resistor (R1), introducing error in the output voltage equation VOUT = VREF × (1 + R1/R2). To keep error <0.1%, R1 should be ≤100 kΩ. Higher values increase error proportionally; e.g., R1 = 1 MΩ adds ~3–4 mV offset due to IREF × R1.
Is LM431CCM3/NOPB pin-compatible with other LM431 variants in SOT-23-3 package?
Yes, all LM431 variants in SOT-23-3 (e.g., LM431ACM3/NOPB, LM431BCM3/NOPB, LM431CIM3/NOPB) share identical pinout: Cathode (Pin 1), Anode (Pin 3), Reference (Pin 2). The LM431CCM3/NOPB differs only in reference voltage tolerance (±1% for "C" grade) and temperature range (0°C–70°C), not pin assignment or package dimensions. PCB layouts designed for any SOT-23-3 LM431 can accommodate LM431CCM3/NOPB without modification.
LM431CCM3/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
LM431CCM3/NOPB FAQ
1.How can I place an order for LM431CCM3/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM431CCM3/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 LM431CCM3/NOPB reliable?
The price and inventory of LM431CCM3/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM431CCM3/NOPB is usually 5 days.
3.What payment methods are accepted for LM431CCM3/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM431CCM3/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM431CCM3/NOPB?
LM431CCM3/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM431CCM3/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 LM431CCM3/NOPB?
For technical support, including LM431CCM3/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM431CCM3/NOPB requirements.
6.How does Aetrix verify that LM431CCM3/NOPB is sourced from the original manufacturer or authorized distributors?
All LM431CCM3/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 LM431CCM3/NOPB meets industry standards.
7.What is the process for return or replacement of LM431CCM3/NOPB?
All LM431CCM3/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM431CCM3/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 LM431CCM3/NOPB part is unused and in its original packaging.
Return procedure for LM431CCM3/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM431CCM3/NOPB Tags
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