STMicroelectronics STS12N3LLH5

Overview

STS12N3LLH5 from STMicroelectronics is an N-channel 30 V Power MOSFET in SO-8 package, featuring R_DS(on) = 0.0068 Ω @ V_GS = 10 V, 6 A; total gate charge Q_g = 8 nC; and 12 A continuous drain current at T_C = 25 °C. It is optimized for high-efficiency DC-DC converters and synchronous rectification in industrial power supplies.

For engineers reviewing the STS12N3LLH5 datasheet, STS12N3LLH5 pinout, STS12N3LLH5 application, or STS12N3LLH5 equivalent, key selection criteria include low R_DS(on) × Q_g figure-of-merit, avalanche ruggedness (unclamped inductive switching rated), SO-8 thermal performance on FR-4 PCB, and gate drive compatibility with 4.5 V logic-level controllers.

Technical Context

This device uses STMicroelectronics' STripFET™ V process to achieve ultra-low on-resistance and minimized gate charge-critical for reducing conduction and switching losses in high-frequency switching topologies. Its 30 V V_DS rating and 12 A I_D capability target mid-power applications where voltage margin and thermal robustness are essential.

The MOSFET integrates a fast-recovery body diode (t_rr = 22 ns, Q_rr = 15 nC at T_j = 150 °C), enabling reliable operation in synchronous buck and half-bridge configurations without external anti-parallel diodes in many cases.

Key Specifications

Pinout & Package

STS12N3LLH5 is housed in a standard SO-8 surface-mount package (ECOPACK® compliant) with exposed drain pad for enhanced thermal dissipation. Pin numbering follows JEDEC MS-012AA.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel 30 V Power MOSFET applications.

Compared with IRLML6344TRPBF and DMN3025LSD-13, STS12N3LLH5 offers the best balance of low R_DS(on), moderate Q_g, and proven avalanche capability-making it optimal for 300–1000 kHz industrial SMPS where both efficiency and reliability are critical.

Availability

STS12N3LLH5 is available at Aetrix Electronics and suitable for industrial power supplies, motor control modules, and telecom DC-DC converters requiring stable component supply and long-term lifecycle support.

Supply support for STS12N3LLH5 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.

This device belongs to ST's STripFET™ V Power MOSFET product line, engineered specifically for high-efficiency, high-reliability switching in 24–48 V industrial power systems where thermal performance and avalanche robustness are non-negotiable.

FAQ

What is the maximum safe operating temperature for STS12N3LLH5?

The STS12N3LLH5 has a maximum operating junction temperature of 150 °C and a storage temperature range of −55 to 150 °C. When mounted on a 1 in² FR-4 PCB with 2 oz copper, its thermal resistance is 47 °C/W, allowing up to ~2.7 W dissipation at 25 °C ambient before reaching T_j = 150 °C. Derating is required above 25 °C ambient at 0.02 W/°C.

Can STS12N3LLH5 be driven directly by a 3.3 V microcontroller GPIO?

No-STS12N3LLH5 has a gate threshold voltage (V_GS(th)) of 1 V min, but requires ≥4.5 V for reliable enhancement and ≤0.0092 Ω R_DS(on). At 3.3 V, R_DS(on) rises significantly (>0.02 Ω), increasing conduction loss. A level-shifting gate driver or dedicated 5–10 V supply is required for full performance.

Does STS12N3LLH5 have built-in ESD protection?

Yes-the device features gate oxide protection with ±100 nA gate leakage (I_GSS) at ±20 V, and is qualified per JEDEC JS-001 Class 2 (2 kV HBM). However, external gate resistors and TVS diodes are still recommended in high-noise environments like motor drives or industrial power stages.

Is STS12N3LLH5 suitable for automotive applications?

No-STS12N3LLH5 is not qualified to AEC-Q101 and lacks automotive-grade screening, packaging, or guaranteed operation across −40 to 150 °C junction range. ST recommends the AEC-Q101-qualified STL12N3LLH6 or STD12N3LLH6 for automotive use, which share similar electrical specs but include extended qualification and traceability.