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Texas Instruments LM431CCM/NOPB
- Part No.:
- LM431CCM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM431CCM/NOPB.pdf
- Description:
- IC VREF SHUNT -0.6%/+0.4% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,380
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Product details
Overview
LM431CCM/NOPB from Texas Instruments is a 3-terminal adjustable precision shunt regulator with 2.485 V to 2.51 V reference voltage (VREF), ±17 mV reference voltage deviation over 0°C to 70°C, 0.5 Ω typical dynamic output impedance, and stable operation up to 36 V cathode voltage - used in feedback loops of linear/switching power supplies for precise output voltage control.
For engineers reviewing the LM431CCM/NOPB datasheet, LM431CCM/NOPB pinout, LM431CCM/NOPB application, or LM431CCM/NOPB equivalent, this page delivers verified electrical specs, SOIC-8 package terminal mapping, real-world use cases including voltage monitoring and Zener replacement, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM431CCM/NOPB operates as a precision shunt regulator by comparing its internal 2.5 V bandgap reference against an external resistor divider on the REF pin, then sinking variable cathode current to maintain regulated output voltage. It functions in closed-loop mode with 1 mA to 100 mA cathode current range and supports open-loop comparator use via direct REF pin drive.
Its architecture includes temperature-compensated bandgap reference, low-noise error amplifier, and high-gain output stage enabling fast turn-on response and low-output noise. The device achieves 50 ppm/°C average temperature coefficient and maintains regulation across full commercial temperature range (0°C to 70°C) without external compensation.
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 0°C to 70°C; determines worst-case output voltage drift in temperature-sensitive applications |
| rZ (Dynamic Impedance) | 0.5 Ω typical at 0 Hz; ensures minimal output voltage variation under dynamic load transients |
| Cathode Voltage Range | 2.5 V to 36 V; enables wide-range output programming while maintaining regulation and thermal safety |
| Min Cathode Current | 0.4–1 mA; minimum shunt current required to sustain regulation - critical for low-power standby designs |
| Reference Input Current | 2–4 μA; ultra-low bias current minimizes divider resistor power loss and improves high-impedance feedback stability |
| ESD Rating (HBM) | ±2500 V; defines handling robustness during PCB assembly and field service without gate oxide damage |
Pinout & Package
LM431CCM/NOPB is housed in an 8-pin SOIC (D) package measuring 4.90 mm × 3.91 mm, rated for 0.81 W internal power dissipation at 25°C ambient with 126.9°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pins 2, 3, 6, 7) | Ground reference node | Common return path for internal reference and amplifier; must be low-impedance connection to system ground |
| Cathode (Pin 1) | Regulated output / shunt current sink | Connects to output node; sinks variable current to maintain set voltage - primary power path for regulation |
| Reference (Pin 8) | Feedback input | High-impedance input sensing divided output voltage; determines regulation point via external R1/R2 network |
| NC (Pins 4, 5) | No internal connection | Unused terminals; must remain unconnected - no routing or grounding required |
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-voltage Zeners |
| Temperature Stability | 50 ppm/°C average tempco and full-range compensation - enables stable references in non-temperature-controlled environments |
| Fast Turn-On Response | Sharp turn-on characteristic supports rapid regulation recovery after line/load transients - critical for SMPS feedback |
| Low Dynamic Output Impedance | 0.5 Ω typical rZ ensures <1 mV output shift under 10 mA load step - maintains tight voltage tolerance in dynamic systems |
| Low-Output Noise | Sub-μV RMS noise floor preserves signal integrity in precision analog circuits and sensor excitation paths |
Applications
| Adjustable Power Supply Regulation | Voltage Monitoring & Protection |
|---|---|
|
Use Scenario: Feedback control loop in 5 V/12 V buck converter where output must track ±1% over line, load, and temperature. IC Role / Device Role / Timing Role: Shunt regulator providing precision voltage reference to optocoupler-based isolated feedback path. Use Value: Enables 2.5 V to 36 V programmability with ±17 mV VREF drift - reduces BOM count vs. discrete Zener + op-amp solutions. |
Use Scenario: Overvoltage detection circuit triggering shutdown when 24 V rail exceeds 26.5 V threshold. IC Role / Device Role / Timing Role: Precision comparator with temperature-stable trip point set by REF pin divider. Use Value: 50 ppm/°C tempco ensures <±0.1 V trip error across 0°C–70°C - outperforms standard Zener-based monitors. |
| Current Source/Sink Circuits | Zener Diode Replacement |
|
Use Scenario: Constant-current LED driver delivering 20 mA to high-brightness indicator with minimal thermal drift. IC Role / Device Role / Timing Role: Two-terminal current regulator configured with cathode-anode as current path and REF tied to cathode. Use Value: 0.4–1 mA minimum cathode current allows stable 20 mA sourcing down to 3 V supply - extends battery life vs. higher-IQ alternatives. |
Use Scenario: Replacing 5.1 V Zener diode in legacy industrial controller power rail clamp. IC Role / Device Role / Timing Role: Adjustable shunt element programmed to 5.1 V with 1% tolerance via 1% resistors. Use Value: 0.5 Ω dynamic impedance provides 5× lower output impedance than typical 5.1 V Zener - improves ripple rejection by >10 dB. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDR | 2.495 V nominal VREF (±0.5%), 0.22 Ω rZ, SOIC-8, same 0°C–70°C rating | Lower dynamic impedance improves transient response; tighter VREF tolerance enhances absolute accuracy | Select TL431ACDR when ±0.5% initial accuracy and sub-0.3 Ω rZ are required for high-precision feedback |
| AS431ASTZTR-G1 | 2.5 V nominal VREF (±1%), 0.6 Ω rZ, TO-92 package, -40°C to 85°C rating | Wider temperature range but higher rZ and larger TO-92 footprint limits high-frequency stability | Choose AS431ASTZTR-G1 only if extended temp range is mandatory and SOIC-8 layout space is unavailable |
Compared with LM431CCM/NOPB, TL431ACDR offers superior accuracy and lower output impedance for demanding feedback loops, while AS431ASTZTR-G1 trades performance for wider temperature coverage and through-hole compatibility - neither is pin-compatible due to differing pinouts and internal NC placements.
Availability
LM431CCM/NOPB is available at Aetrix Electronics and suitable for adjustable power supplies, voltage monitoring systems, and precision current source designs requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM431CCM/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 as a drop-in upgrade to discrete Zener+transistor shunt regulators, targeting cost-sensitive yet accuracy-critical applications in industrial power, telecom infrastructure, and consumer electronics.
FAQ
What is the reference voltage tolerance of LM431CCM/NOPB over temperature?
The LM431CCM/NOPB has a reference voltage (VREF) of 2.485 V to 2.51 V at 25°C and exhibits ±17 mV maximum deviation across the full 0°C to 70°C operating range. This corresponds to approximately ±0.68% total variation, enabling reliable voltage setting in commercial-temperature applications without external calibration.
Can LM431CCM/NOPB replace a standard Zener diode directly?
Yes, LM431CCM/NOPB can replace many Zener diodes in shunt regulator configurations, but requires two external resistors to set the output voltage and has three terminals (anode, cathode, reference) versus two for a Zener. Its 2.5 V minimum output and adjustable range up to 36 V provide greater flexibility than fixed Zeners, though PCB layout must accommodate the third pin.
What is the minimum cathode current needed for regulation in LM431CCM/NOPB?
The LM431CCM/NOPB requires a minimum cathode current (IZ(MIN)) of 0.4 mA to 1 mA to maintain regulation, depending on operating conditions. This value is specified at VZ = VREF and defines the lowest shunt current that sustains stable output voltage - critical for designing series resistor (RS) values in low-power applications.
Does LM431CCM/NOPB support operation above 36 V cathode voltage?
No, LM431CCM/NOPB has an absolute maximum cathode voltage rating of 37 V, with recommended operation limited to ≤36 V. Exceeding this risks permanent damage per Absolute Maximum Ratings. For higher-voltage applications, external clamping or series limiting components must be added - the device itself is not rated beyond 36 V.
How does the SOIC-8 package of LM431CCM/NOPB affect thermal performance?
The LM431CCM/NOPB in SOIC-8 package has a junction-to-ambient thermal resistance (RθJA) of 126.9°C/W and maximum internal power dissipation of 0.81 W at 25°C ambient. Derating is required above 25°C - at 70°C ambient, usable power drops to ~0.45 W - making heatsinking unnecessary for typical <100 mA cathode currents but critical near thermal limits.
LM431CCM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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:
- 8-SOIC
LM431CCM/NOPB FAQ
1.How can I place an order for LM431CCM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM431CCM/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 LM431CCM/NOPB reliable?
The price and inventory of LM431CCM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM431CCM/NOPB is usually 5 days.
3.What payment methods are accepted for LM431CCM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM431CCM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM431CCM/NOPB?
LM431CCM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM431CCM/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 LM431CCM/NOPB?
For technical support, including LM431CCM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM431CCM/NOPB requirements.
6.How does Aetrix verify that LM431CCM/NOPB is sourced from the original manufacturer or authorized distributors?
All LM431CCM/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 LM431CCM/NOPB meets industry standards.
7.What is the process for return or replacement of LM431CCM/NOPB?
All LM431CCM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM431CCM/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 LM431CCM/NOPB part is unused and in its original packaging.
Return procedure for LM431CCM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM431CCM/NOPB 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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