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Texas Instruments LM431CCZ/NOPB
- Part No.:
- LM431CCZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM431CCZ/NOPB.pdf
- Description:
- IC VREF SHUNT -0.6%/+0.4% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,820
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Product details
Overview
LM431CCZ/NOPB from Texas Instruments is a 3-terminal adjustable precision shunt regulator with 2.5 V reference voltage, ±17 mV reference voltage deviation over temperature, 0.5 Ω dynamic output impedance, 1 mA minimum cathode current for regulation, and TO-92 package for through-hole mounting in linear power supplies and voltage monitoring circuits.
For engineers reviewing the LM431CCZ/NOPB datasheet, LM431CCZ/NOPB pinout, LM431CCZ/NOPB application, or LM431CCZ/NOPB equivalent, this page delivers verified electrical specs, thermal derating guidance, real-world shunt regulator design constraints, and validated alternative parts for precision reference replacement scenarios.
Technical Context
The LM431CCZ/NOPB operates as a two-input comparator driving an internal NPN transistor to regulate cathode voltage via shunt current control. Its reference input (2.5 V nominal) compares against a resistor-divider feedback network, enabling programmable output from 2.5 V to 36 V. The device uses bandgap-derived reference circuitry with on-chip temperature compensation.
It functions in closed-loop shunt mode with 1–100 mA cathode current range and supports open-loop comparator use. Thermal hysteresis is induced by package stress, not semiconductor drift, and its low 50 ppm/°C average temperature coefficient ensures stable regulation across 0°C to 70°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference voltage (VREF) | 2.485–2.51 V at 10 mA - defines minimum programmable output and sets accuracy baseline for external resistor divider. |
| Reference voltage deviation | ±17 mV over full temperature range - limits worst-case output error without trimming. |
| Dynamic output impedance | 0.5 Ω at DC - enables tight load regulation and low output noise in shunt configurations. |
| Minimum cathode current | 0.4–1 mA - determines smallest usable series resistor value for reliable turn-on under light-load conditions. |
| Cathode voltage range | 2.5 V to 36 V - sets maximum output programmability and defines absolute maximum rating margin (37 V). |
| Operating temperature | 0°C to 70°C - defines commercial-grade thermal envelope for stable reference performance. |
| ESD rating (HBM) | ±2500 V - informs handling requirements during PCB assembly and test. |
Pinout & Package
LM431CCZ/NOPB uses a 3-pin TO-92 package (4.30 mm × 4.30 mm body), optimized for through-hole mounting and manual prototyping. Pin 1 is Cathode (I/O), Pin 2 is Reference (input), Pin 3 is Anode (output, typically grounded).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current path / regulated output node | Connects to supply rail via series resistor; voltage at this pin is the regulated output (2.5–36 V). |
| Reference (Pin 2) | Feedback input | Connected to resistor divider midpoint; senses output voltage and triggers regulation when ≥2.485 V. |
| Anode (Pin 3) | Current sink / ground return | Typically tied to system ground; carries total cathode current minus reference input current (≤4 μA). |
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 Zener diodes. |
| Temperature-compensated reference | Average tempco of 50 ppm/°C over 0°C–70°C - maintains <±0.35% output drift across operating range. |
| Fast turn-on response | Enables stable regulation during transient load steps without external compensation - critical for crowbar and protection circuits. |
| Low-output noise | Minimizes ripple injection into sensitive analog rails - measured with <10 μV RMS typical noise floor. |
| Low-dynamic output impedance | 0.5 Ω at DC - sustains <10 mV load regulation error for 10 mA load step changes. |
Applications
| Switching Power Supply Feedback | Voltage Monitoring Circuit |
|---|---|
Use Scenario: Secondary-side voltage sensing in isolated flyback converters using optocoupler feedback loop. IC Role / Device Role / Timing Role: Adjustable shunt regulator providing precise 2.5 V reference to drive optocoupler LED current proportional to output voltage. Use Value: Enables ±1% output regulation without secondary-side LDO; replaces discrete Zener + transistor with single IC and tighter tolerance. |
Use Scenario: Overvoltage detection in 12 V automotive subsystems triggering shutdown before damage occurs. IC Role / Device Role / Timing Role: Precision threshold comparator with hysteresis added externally; reference pin biased to 12.5 V via resistor divider. Use Value: Detects >12.5 V with ±0.2 V accuracy over temperature, avoiding false trips caused by Zener tolerance stack-up. |
| Constant Current Sink | Zener Diode Replacement |
Use Scenario: LED biasing in industrial status indicators requiring stable 20 mA drive independent of supply variation. IC Role / Device Role / Timing Role: Shunt regulator configured with cathode tied to LED anode and reference pin set to 2.5 V; sinks excess current to ground. Use Value: Delivers <±2% current stability from 5 V to 24 V input, eliminating thermal runaway risk of basic Zener-based sinks. |
Use Scenario: Replacing 3.3 V, 5.1 V, and 12 V Zener diodes in legacy analog power rails where space and BOM count matter. IC Role / Device Role / Timing Role: Programmable shunt element substituting for fixed-voltage Zeners using same TO-92 footprint and pinout. Use Value: Reduces inventory SKUs by 75% while improving reference accuracy from ±5% (Zener) to ±0.4% (LM431CCZ/NOPB). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACZ | Same 2.5 V reference, but ±2% initial tolerance (vs. ±0.4% for LM431CCZ/NOPB); higher 2.2 Ω dynamic impedance. | Acceptable for non-critical feedback loops where cost is prioritized over precision. | Select TL431ACZ only when ±2% output tolerance and reduced thermal stability are acceptable. |
| AS431AZTR-E1 | Pin-compatible TO-92 variant with ±1% reference tolerance and 1.2 Ω dynamic impedance; rated for -40°C to 105°C. | Suitable for extended-temperature industrial environments where LM431CCZ/NOPB's 0°C–70°C range is insufficient. | Choose AS431AZTR-E1 when operating above 70°C or requiring tighter initial tolerance than LM431CCZ/NOPB offers. |
Compared with TL431ACZ and AS431AZTR-E1, LM431CCZ/NOPB provides the tightest reference tolerance (±0.4%) and lowest dynamic impedance (0.5 Ω) in the commercial temperature grade, making it optimal for high-accuracy linear regulators and precision monitoring where stability outweighs extended temperature range or cost sensitivity.
Availability
LM431CCZ/NOPB is available at Aetrix Electronics and suitable for switching power supply feedback, voltage monitoring circuits, constant current sink designs, and Zener diode replacement applications requiring stable component supply and long-term BOM continuity.
Supply support for LM431CCZ/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 high-accuracy voltage regulation in cost-sensitive, space-constrained applications-delivering Zener-level simplicity with IC-grade precision, temperature stability, and programmability.
FAQ
What is the reference voltage tolerance of LM431CCZ/NOPB?
The LM431CCZ/NOPB has a reference voltage (VREF) tolerance of ±0.4% - specified as 2.485 V to 2.51 V at 10 mA and 25°C. This tight tolerance enables high-accuracy output programming in shunt regulator circuits without external trimming, distinguishing it from standard Zener diodes with ±5% tolerance.
Can LM431CCZ/NOPB replace a standard Zener diode directly?
Yes, LM431CCZ/NOPB can directly replace many Zener diodes in through-hole designs due to its identical TO-92 package, 3-pin configuration, and shunt-regulator functionality. However, it requires two external resistors to set output voltage and draws ~4 μA reference current - unlike passive Zeners, which need no bias network.
What is the minimum cathode current required for regulation in LM431CCZ/NOPB?
The LM431CCZ/NOPB requires a minimum cathode current (IZ(MIN)) of 0.4–1 mA to maintain regulation, per datasheet Section 6.5. This defines the upper limit of the series resistor value in shunt configurations - if current falls below this threshold, output voltage collapses and regulation is lost.
Does LM431CCZ/NOPB support operation above 70°C?
No, LM431CCZ/NOPB is rated for 0°C to 70°C operation only. For industrial or extended-temperature applications, TI offers the LM431CIZ/NOPB variant (-40°C to 85°C) in the same TO-92 package, with identical electrical specs except for thermal range and part marking.
How does the dynamic output impedance of LM431CCZ/NOPB affect load regulation?
The LM431CCZ/NOPB has a dynamic output impedance of 0.5 Ω at DC, meaning a 10 mA load change causes only ~5 mV output shift. This low impedance ensures stable voltage under varying load conditions - critical for feedback loops and precision references where Zener diodes (typically >10 Ω) would exhibit excessive droop.
LM431CCZ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM431CCZ/NOPB FAQ
1.How can I place an order for LM431CCZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM431CCZ/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 LM431CCZ/NOPB reliable?
The price and inventory of LM431CCZ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM431CCZ/NOPB is usually 5 days.
3.What payment methods are accepted for LM431CCZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM431CCZ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM431CCZ/NOPB?
LM431CCZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM431CCZ/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 LM431CCZ/NOPB?
For technical support, including LM431CCZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM431CCZ/NOPB requirements.
6.How does Aetrix verify that LM431CCZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM431CCZ/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 LM431CCZ/NOPB meets industry standards.
7.What is the process for return or replacement of LM431CCZ/NOPB?
All LM431CCZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM431CCZ/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 LM431CCZ/NOPB part is unused and in its original packaging.
Return procedure for LM431CCZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM431CCZ/NOPB Tags
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AZ431LANTR-G1
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