LM431SCCMLX

LM431SCCMLX is TI’s variant of the LM431 programmable precision shunt regulator (TL431 family). It provides a stable 2.495 V reference on the REF pin and regulates current on the cathode to keep that reference, adjustable by an external resistor divider to set the trip/regulation voltage. It can be used as a precision reference, an error amplifier in power-supply feedback, or as a programmable zener in DC-DC and LED-driver circuits.
Key points:
- Vref ≈ 2.495 V (typical)
- Supply range (anode–cathode) up to about 36 V
- Minimum cathode current to maintain regulation ≈ 1 mA
- Maximum cathode current ≈ tens to ~100 mA (datasheet value)
- Low dynamic impedance and good line/load regulation
- Three terminals: REF, ANODE, CATHODE
The SCCMLX suffix denotes a specific packaging/revision. For package details, pinout, and exact electrical specs, consult the official datasheet.

LM431SCCMLX is a 2.495 V programmable shunt regulator. Common equivalents (pin/package differences apply): TL431 family (TL431, TL431A, TL431B, TL431C); TLV431; KA431; NCP431; REF431; LMV431; MCP431. Always verify pinout, current ranges, and temperature specs before substituting.

Here are the key features of the LM431SCCMLX (3-pin adjustable precision shunt regulator):
- 2.495 V reference (typical) for a TL431-compatible device
- Adjustable output via external resistor divider (Vout ≈ Vref × (1 + R2/R1) ± Iref×R2)
- Maximum cathode-to-anode voltage up to 36 V
- Minimum cathode current requirement for regulation (and ability to sink current to regulate)
- 3-pin device (REF, ANODE, CATHODE) with TL431-compatible pinout
- Temperature range typically -40°C to 125°C (industrial/extended range variant)
- Low dynamic impedance and fast transient response
- Suitable for precision shunt regulation, voltage references, battery charging, and post-regulation in power supplies
- RoHS-compliant in the SCCM/LX packaging family (compact SC-70/SOT-23 style)
Note: Exact tolerances and operating ranges depend on the specific grade and package variant.

- Pin count: 3 pins
- Function: Programmable precision shunt regulator (3-terminal, like a TL431). Maintains ~2.495 V between REF and ANODE; CATHODE serves as the output that shunts current to regulate the voltage set by an external resistor network.
- Typical pinout (SC-70 / LM431 in SCC package): Pin 1 = REF, Pin 2 = ANODE, Pin 3 = CATHODE.

- Manufacturer: Texas Instruments (TI).
- Company type: An American multinational semiconductor company that designs and manufactures analog and embedded processing ICs.

LM431SCCMLX is a precision adjustable shunt regulator (programmable zener) with a 2.495 V reference and external‑resistor programming. Common applications:
- Precision voltage reference and regulation in linear power supplies
- Programmable reference for ADC/DACs and instrumentation
- Battery‑charging circuits and general power‑management reference
- Overvoltage protection or crowbar-style regulation with an error amplifier
- Low‑power, compact reference in smt designs (SCCMLX package)
Note: Used where an adjustable, stable reference or shunt regulator is needed in analog control loops.

SC-70 package (3-pin, SMD).