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Home > Products > Discrete Semiconductor Products > Transistors > FETs, MOSFETs > FETs, MOSFETs

STMicroelectronics STS12NH3LL

Name: STS12NH3LL
Brand: STMicroelectronics
SKU: STS12NH3LL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STS12NH3LL

Manufacturer:: STMicroelectronics

Category:: FETs, MOSFETs

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: STS12NH3LL.pdf

Description:: MOSFET N-CH 30V 12A 8SO

Quantity:: RFQ Add To RFQ list

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Inventory:7,639

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Product details

Overview

STS12NH3LL from STMicroelectronics is an N-channel 30 V, 12 A ultra-low-Qg Power MOSFET in SO-8 package, featuring R_DS(on) = 0.008 Ω @ V_GS = 10 V, Q_g = 9 nC (typ.), and optimized for high-frequency DC-DC converter high-side switching in telecom and computing power supplies.

For engineers reviewing the STS12NH3LL datasheet, STS12NH3LL pinout, STS12NH3LL application, or STS12NH3LL equivalent, key selection criteria include gate charge trade-off at 4.5 V, low C_iss (965 pF), fast switching (t_d(on) = 15 ns), thermal resistance (R_thj-amb = 47 °C/W on FR-4), and SO-8 footprint compatibility with high-density board layouts.

Technical Context

This MOSFET employs ST's STripFET™ III technology with an optimized cell layout to minimize both R_DS(on) × Q_g and input capacitance (C_iss = 965 pF). Its low threshold voltage (V_GS(th) = 1 V typ.) enables robust turn-on with 4.5 V logic-level drive.

The device supports pulsed drain current up to 48 A and exhibits fast reverse recovery (t_rr = 24 ns, Q_rr = 17.4 nC) with source-drain diode forward voltage of 1.3 V at 12 A - critical for synchronous rectification and inductive load switching.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	30 V - maximum blocking voltage compatible with 24 V input rails and transient margin in telecom DC-DC stages
R_DS(on) @ 10 V	0.008 Ω - conduction loss of 1.15 W at 12 A continuous, enabling compact thermal design
Q_g	9 nC (typ.) - reduces gate driver power demand and enables >1 MHz switching in high-efficiency converters
C_iss	965 pF - low input capacitance minimizes Miller effect and improves EMI profile during hard switching
t_d(on)	15 ns - short turn-on delay supports precise timing control in digitally regulated power stages
T_J max	150 °C - rated junction temperature allows operation under sustained 100 °C case conditions with derated I_D = 7.5 A

Pinout & Package

STS12NH3LL is housed in a standard SO-8 surface-mount package (ECOPACK® compliant, lead-free, JEDEC MS-012AC), with exposed drain pad for enhanced thermal dissipation. Pin 1 is gate (G), pins 2–4 and 6–8 are source (S), and pin 5 is drain (D).

Pin/Terminal	Circuit Role	Design Meaning
1	Gate (G)	Control terminal; low input capacitance (C_iss) and 1 V threshold enable direct microcontroller drive
2, 3, 4, 6, 7, 8	Source (S)	Common return path; six parallel pins reduce source inductance and improve switching stability
5	Drain (D)	Main power output node; connected to exposed pad for low R_thj-amb (47 °C/W on FR-4)

Key Features

Feature	Design Value
Ultra-low Q_g × R_DS(on) product	Optimized at 4.5 V gate drive for minimal switching + conduction loss trade-off in 500 kHz–2 MHz converters
Low threshold voltage	V_GS(th) = 1 V (typ.) ensures reliable enhancement-mode turn-on with 3.3 V or 5 V logic controllers
Fast body diode recovery	t_rr = 24 ns and Q_rr = 17.4 nC reduce shoot-through risk and switching losses in synchronous buck topologies
SO-8 with exposed drain	Standard footprint with thermal pad enables drop-in replacement while improving power density vs. DPAK alternatives

Applications

Telecom DC-DC Converters

Server VRMs

Use Scenario: High-frequency (1–2 MHz) point-of-load buck converter supplying core voltage to ASICs in 48 V telecom systems.

IC Role / Device Role: High-side synchronous switch managing 12 A peak load current with minimal dead-time loss.

Use Value: Low Q_g and fast t_d(on)/t_f enable tight regulation and <1% output ripple at full load.

Use Scenario: Multiphase CPU voltage regulator module delivering dynamic 12 A loads with <100 ns transient response.

IC Role / Device Role: Primary high-side FET in each phase, driven by dedicated PWM controller with 4.5 V gate bias.

Use Value: 0.008 Ω R_DS(on) limits conduction loss to ≤1.2 W per phase, supporting 92% efficiency at 12 V input.

Industrial PLC Power Supplies

Networking Switch PSUs

Use Scenario: Compact 24 V input, 5 V/12 A isolated DC-DC module powering I/O modules in harsh industrial environments.

IC Role / Device Role: Main switch in active-clamp forward topology operating at 500 kHz with 150 °C ambient tolerance.

Use Value: 150 °C T_J rating and 7.5 A derated current at 100 °C case ensure reliability without forced air cooling.

Use Scenario: 48 V backplane-fed PoE++ midspan supply with dual-output (57 V/54 V) requiring high-efficiency primary-side switching.

IC Role / Device Role: High-side switch in resonant LLC half-bridge primary stage handling 12 A RMS current.

Use Value: Low C_oss (285 pF) and C_rss (38 pF) minimize capacitive losses and improve ZVS behavior above 300 kHz.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STL12N3LLH6	Same R_DS(on) (0.008 Ω), but H6 package (PowerFLAT 3.3×3.3 mm); Q_g = 10.5 nC; no exposed drain pad	Better thermal performance in space-constrained layouts; unsuitable for SO-8 footprint reuse	Select when board area is limited and thermal pad soldering is feasible
IRF7470PBF	Higher R_DS(on) (0.012 Ω @ 10 V); Q_g = 14 nC; SO-8 but non-ECOPACK	Higher conduction loss (+50%) and slower switching; legacy RoHS-compliant only	Use only if STS12NH3LL is unavailable and thermal margin permits 1.7 W loss

Compared with STL12N3LLH6 and IRF7470PBF, STS12NH3LL delivers the lowest combined switching-conduction loss in SO-8 format, with verified 4.5 V drive capability and ECOPACK® compliance - making it optimal for new telecom and server PSU designs requiring footprint continuity and high-frequency efficiency.

Availability

STS12NH3LL is available at Aetrix Electronics and suitable for telecom DC-DC converters, server VRMs, industrial PLC power supplies, and networking switch PSUs requiring stable component supply and SO-8 footprint compatibility.

Supply support for STS12NH3LL 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, digital, and mixed-signal ICs for automotive, industrial, and power applications.

STS12NH3LL belongs to ST's STripFET™ III Power MOSFET product line, engineered specifically for high-frequency, high-efficiency DC-DC conversion in space-constrained telecom and computing infrastructure.

FAQ

Is STS12NH3LL suitable for 3.3 V microcontroller gate drive?

Yes. With a typical gate threshold voltage of 1 V and guaranteed turn-on at V_GS ≥ 2.5 V, STS12NH3LL fully enhances using 3.3 V logic outputs. Its low Q_g (9 nC) ensures fast switching without external gate drivers in moderate-current applications.

What is the maximum continuous drain current at 85 °C case temperature?

Per the datasheet's derating curve, at T_C = 85 °C, the maximum continuous drain current is approximately 9.2 A. This is derived from linear interpolation between ID = 12 A at 25 °C and ID = 7.5 A at 100 °C, maintaining safe SOA operation.

Does STS12NH3LL have integrated ESD protection on the gate?

No. The device does not include on-chip gate ESD protection diodes. External gate resistors (≥10 Ω) and TVS clamping are recommended in systems exposed to handling or system-level transients to prevent gate oxide damage from ±18 V absolute maximum V_GS violations.

Can STS12NH3LL replace STB12NH3LL in existing designs?

No. STB12NH3LL uses TO-263 (D2PAK) packaging with different thermal and electrical parasitics. While both share identical die characteristics, the SO-8 footprint, pinout, and lower R_thj-amb of STS12NH3LL require PCB redesign and layout validation before substitution.

STS12NH3LL Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: STripFET™

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 30 V

Current - Continuous Drain (Id) @ 25°C:: 12A (Tc)

Drive Voltage (Max Rds On, Min Rds On):: 4.5V, 10V

Rds On (Max) @ Id, Vgs:: 10.5mOhm @ 6A, 10V

Vgs(th) (Max) @ Id:: 1V @ 250µA

Gate Charge (Qg) (Max) @ Vgs:: 12 nC @ 4.5 V

Vgs (Max):: ±16V

Input Capacitance (Ciss) (Max) @ Vds:: 965 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 2.7W (Tc)

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 8-SOIC

STS12NH3LL FAQ

1.How can I place an order for STS12NH3LL through Aetrix?

Please submit a Request for Quotation (RFQ) for STS12NH3LL 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 STS12NH3LL reliable?

The price and inventory of STS12NH3LL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STS12NH3LL is usually 5 days.

3.What payment methods are accepted for STS12NH3LL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STS12NH3LL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STS12NH3LL?

STS12NH3LL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STS12NH3LL 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 STS12NH3LL?

For technical support, including STS12NH3LL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STS12NH3LL requirements.

6.How does Aetrix verify that STS12NH3LL is sourced from the original manufacturer or authorized distributors?

All STS12NH3LL 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 STS12NH3LL meets industry standards.

7.What is the process for return or replacement of STS12NH3LL?

All STS12NH3LL units undergo pre-shipment inspection (PSI). If there is an issue with STS12NH3LL, 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 STS12NH3LL part is unused and in its original packaging.

Return procedure for STS12NH3LL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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