LM431SCCMLX

LM431SCCMLX is Texas Instruments’ LM431 programmable precision shunt regulator (three-terminal adjustable reference) in a small SMD package (the LX suffix indicates RoHS/lead‑free packaging, e.g., SOT-23/SC‑70 style).
What it is
- A 2.495 V reference with an error amplifier that holds Ref about 2.495 V above the Anode, while current flows from Cathode to Anode.
- Used as a precise voltage reference or as an adjustable shunt regulator.
Key specs (typical)
- Reference: Vref ≈ 2.495 V
- Input range: up to about 36 V across Cathode–Anode
- Operating current: I_K(min) ~ 1 mA (for regulation) to I_K(max) ~ 100 mA
- Packaging: RoHS, lead-free SMD (SCCMLX variant in small 3-pin package)
- Temp range: common industrial range (-40°C to 125°C)
How to use
- Basic circuit: R1 from Vout to Ref, R2 from Ref to Anode (ground). Vout ≈ Vref × (1 + R1/R2) + Iref × R1 (Iref is small and often neglected).
- Pinout: Cathode (K), Anode (A), Reference (Ref).
Applications
- Precision references, post-regulation, simple adjustable regulators in power supplies.

Concise features of LM431SCCMLX (adjustable precision shunt regulator):
- Precision shunt regulator with 2.495 V reference (TL431-compatible)
- Output set by external resistor divider (adjustable regulation)
- Wide cathode-to-anode operating range (approximately 2.5 V to 36 V)
- Minimum cathode current to maintain regulation (typical ~1 mA); maximum cathode current around tens of mA up to ~100 mA
- Low dynamic impedance and good line/load regulation
- Wide temperature range (-40°C to 125°C) for harsh environments
- Small package: SC-70/SOT-23-3 family (SCCMLX variant), RoHS compliant, MSL rating 3
- Suitable for reference, voltage regulation, OVP, and programmable shunt regulator applications
Note: Specific performance (accuracy, impedance, and tempco) varies with lot and package; consult the datasheet for exact values.

SC-70 3-pin small-outline package (SC-70-3). The MLX suffix indicates RoHS lead-free packaging.

Pin count: 3 pins.
Function: Three-terminal adjustable precision shunt regulator (programmable zener) with a 2.495 V reference. Used to regulate voltage by shunting current; pins are Ref (control), Anode, and Cathode (K). The cathode voltage is limited by the external feedback network to keep the reference at ~2.495 V.

The LM431SCCMLX is manufactured by Texas Instruments (TI).
Texas Instruments is an American multinational semiconductor company that designs and manufactures analog and embedded processing ICs, and is one of the world’s largest semiconductor makers.

LM431SCCMLX is an adjustable precision shunt regulator (programmable zener). Common applications:
- Precision voltage reference for ADC/DAC and instrumentation
- Feedback/reference element in linear regulators and switch-mode power supplies
- Post-regulation and overvoltage protection in power supplies
- LED driver and current-regulation circuits (with sense resistor)
- Battery chargers and general circuits needing a stable reference or zener substitute

LM431SCCMLX is a 2.495 V programmable shunt regulator. Common equivalents (pin-compatible 3‑pin packages) include:
- TL431 family (TL431, TL431A, TL431B)
- TLV431
- LMV431
- NCP431
- KA431 (and other vendor 2.495 V shunt references)