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

Infineon Technologies BSS119NH7978XTSA1

Name: BSS119NH7978XTSA1
Brand: Infineon Technologies
SKU: BSS119NH7978XTSA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS119NH7978XTSA1

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: BSS119NH7978XTSA1.pdf

Description:: SMALL SIGNAL N-CHANNEL MOSFET

Quantity:: RFQ Add To RFQ list

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Product details

Overview

BSS119NH7978XTSA1 from Infineon Technologies is an N-channel enhancement-mode logic-level MOSFET rated for 100 V V_DS, 0.19 A continuous drain current at 25 °C, and 10 Ω R_DS(on) at V_GS = 4.5 V. It features avalanche rating, AEC-Q101 qualification, and SOT-23 package - used in low-power load switching, LED drivers, and automotive body electronics where compact size and 4.5 V gate drive compatibility are critical.

For engineers reviewing the BSS119NH7978XTSA1 datasheet, BSS119NH7978XTSA1 pinout, BSS119NH7978XTSA1 application, or BSS119NH7978XTSA1 equivalent, this part supports logic-level drive in space-constrained 12 V automotive subsystems, offers verified avalanche energy (2.0 mJ), and delivers stable R_DS(on) performance across −55 °C to 150 °C junction temperature range.

Technical Context

This OptiMOS™ small-signal transistor operates in enhancement mode with a gate threshold voltage of 1.3–2.3 V and supports full conduction at 4.5 V logic-level drive. Its 100 V breakdown voltage and 2.0 mJ single-pulse avalanche energy enable robust operation in inductive load switching.

Dynamic parameters include C_iss = 20.9 pF max, t_r = 3.3 ns, and t_f = 18.8 ns, supporting fast switching in low-duty-cycle control circuits. The integrated body diode has V_SD = 0.8–1.1 V at I_F = 0.19 A and t_rr = 12 ns, suitable for freewheeling in DC-DC converters and relay drivers.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS max	100 V - supports 12 V/24 V automotive and industrial bus systems with margin against transients
R_DS(on) @ 4.5 V	10 Ω max - enables full on-state conduction using standard 3.3 V/5 V microcontroller GPIO
I_D continuous	0.19 A @ T_A = 25 °C - suitable for driving LEDs, small solenoids, and signal-path loads
E_AS	2.0 mJ - withstands inductive kickback without failure in relay or motor-gate applications
V_GS(th)	1.3–2.3 V - ensures reliable turn-on with low-voltage logic while avoiding false triggering
t_rr	12 ns - minimizes reverse recovery loss in high-frequency PWM-controlled loads
Q_g	0.6 nC - reduces gate drive power requirement and simplifies driver selection

Pinout & Package

Package: PG-SOT23 (standard SOT-23-3, JEDEC TO-236AB); footprint optimized for minimal PCB area with thermal pad not present; RoHS-compliant, halogen-free, lead-free construction.

Pin/Terminal	Circuit Role	Design Meaning
1 (Drain)	High-side or low-side current path terminal	Connected to load or supply rail; carries full switched current; electrically isolated from package tab
2 (Gate)	Control input node	Receives logic-level voltage; requires <20 V absolute max; sensitive to ESD (Class HBM 0)
3 (Source)	Reference node for gate drive and current return	Typically tied to ground (low-side) or load (high-side); defines V_GS reference point

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive applications including interior lighting, door modules, and sensor interface circuits
Logic-level gate drive	Guaranteed turn-on at V_GS = 4.5 V, compatible with 3.3 V and 5 V MCU outputs without level-shifting
Avalanche-rated	Withstands 2.0 mJ single-pulse energy - eliminates need for external snubbers in inductive switching
Halogen-free & RoHS	Complies with automotive environmental standards and end-of-life recycling requirements
Low Q_gd/Q_g ratio	Q_gd = 0.25 nC of total 0.6 nC - improves switching controllability and reduces Miller-induced shoot-through risk

Applications

Automotive Interior Lighting

Industrial Sensor Interface

Use Scenario: Switching 12 V LED strings in door handle illumination and map lights.

IC Role / Device Role / Timing Role: Low-side load switch controlled by CAN/LIN node MCU GPIO.

Use Value: 10 Ω R_DS(on) at 4.5 V ensures <200 mW conduction loss per channel; AEC-Q101 qualification guarantees reliability over 15-year vehicle lifetime.

Use Scenario: Enabling/disabling analog sensor bias rails in programmable logic controllers.

IC Role / Device Role / Timing Role: Precision power gating element isolating 5 V sensor supply during standby.

Use Value: Sub-1 µA I_DSS at 100 V ensures negligible leakage in always-on monitoring circuits; 1.3–2.3 V V_GS(th) prevents false turn-on from noise coupling.

USB-C Power Path Control

Smart Home Actuator Driver

Use Scenario: Reverse-current blocking and load disconnect in USB-C port protection IC auxiliary paths.

IC Role / Device Role / Timing Role: High-side switch managing V_BUS routing between upstream/downstream ports.

Use Value: 100 V V_DS rating accommodates 20 V PD3.1 transients; 12 ns t_rr limits cross-conduction during hot-swap transitions.

Use Scenario: Driving miniature latching solenoids in smart lock actuators and HVAC dampers.

IC Role / Device Role / Timing Role: Pulse-controlled power switch delivering 0.77 A peak current for mechanical actuation.

Use Value: 2.0 mJ E_AS safely clamps inductive flyback without external components; SOT-23 footprint fits tight mechanical envelopes.

Equivalent & Alternatives

The following parts are listed as comparable options for similar N-channel logic-level MOSFET applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2016LFG-7	R_DS(on) = 8.5 Ω @ 4.5 V; lower V_GS(th) (0.5–1.2 V); no AEC-Q101 rating	Preferred for consumer-grade portable devices where automotive qualification is unnecessary	Select when lower on-resistance is prioritized over automotive reliability validation
FDV303N	R_DS(on) = 3.1 Ω @ 4.5 V; higher I_D (0.22 A); non-automotive, no avalanche rating	Suitable for cost-sensitive IoT endpoints with benign electrical environments	Choose only if system-level transient immunity is managed externally and AEC-Q101 is not required

Compared with DMN2016LFG-7 and FDV303N, BSS119NH7978XTSA1 trades slightly higher R_DS(on) for guaranteed avalanche ruggedness and automotive qualification - making it the sole choice for safety-critical 12 V load switching where field reliability is non-negotiable.

Availability

BSS119NH7978XTSA1 is available at Aetrix Electronics and suitable for automotive interior lighting, industrial sensor interface, USB-C power path control, and smart home actuator driver applications requiring stable component supply across extended product lifecycles.

Supply support for BSS119NH7978XTSA1 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

Infineon Technologies is a German semiconductor manufacturer specializing in power management, automotive electronics, and security solutions, with global manufacturing and R&D infrastructure.

The BSS119N belongs to Infineon's OptiMOS™ small-signal MOSFET product line, engineered specifically for logic-level switching in space-constrained automotive and industrial control nodes where reliability under transient stress is essential.

FAQ

Is BSS119NH7978XTSA1 pin-compatible with standard SOT-23 MOSFETs?

Yes - it uses the industry-standard PG-SOT23-3 package with Drain (pin 1), Gate (pin 2), and Source (pin 3) pinout matching JEDEC TO-236AB. No adapter or footprint change is needed when replacing other SOT-23 N-channel MOSFETs with identical pin assignment.

What is the maximum safe operating temperature for continuous use?

The device supports continuous operation up to T_j = 150 °C. At ambient temperatures above 70 °C, derating applies: I_D drops linearly from 0.19 A at 25 °C to 0.15 A at 70 °C, with thermal resistance R_thJA = 250 K/W on minimal FR4 footprint.

Does BSS119NH7978XTSA1 require a gate resistor for typical MCU drive?

A series gate resistor of 10–100 Ω is recommended to damp ringing and limit peak gate current. With Q_g = 0.6 nC and typical MCU output impedance, this ensures clean 3.3 V/5 V edge transitions while preventing overshoot beyond ±20 V V_GS absolute maximum.

Can this MOSFET replace BSS138 in existing designs?

No - BSS138 has V_DS = 50 V and R_DS(on) = 3.5 Ω @ 10 V, but BSS119N offers 100 V rating and logic-level drive at 4.5 V. Direct replacement is unsafe unless circuit voltage stays ≤50 V and gate drive remains ≥10 V; redesign is required for full specification compliance.

BSS119NH7978XTSA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: OptiMOS™

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Bulk

Product Status:: Active

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 100 V

Current - Continuous Drain (Id) @ 25°C:: 190mA (Ta)

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

Rds On (Max) @ Id, Vgs:: 6Ohm @ 190mA, 10V

Vgs(th) (Max) @ Id:: 2.3V @ 13µA

Gate Charge (Qg) (Max) @ Vgs:: 0.6 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 20.9 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 500mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: PG-SOT23-3-5

BSS119NH7978XTSA1 FAQ

1.How can I place an order for BSS119NH7978XTSA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS119NH7978XTSA1 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 BSS119NH7978XTSA1 reliable?

The price and inventory of BSS119NH7978XTSA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS119NH7978XTSA1 is usually 5 days.

3.What payment methods are accepted for BSS119NH7978XTSA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS119NH7978XTSA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS119NH7978XTSA1?

BSS119NH7978XTSA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS119NH7978XTSA1 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 BSS119NH7978XTSA1?

For technical support, including BSS119NH7978XTSA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS119NH7978XTSA1 requirements.

6.How does Aetrix verify that BSS119NH7978XTSA1 is sourced from the original manufacturer or authorized distributors?

All BSS119NH7978XTSA1 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 BSS119NH7978XTSA1 meets industry standards.

7.What is the process for return or replacement of BSS119NH7978XTSA1?

All BSS119NH7978XTSA1 units undergo pre-shipment inspection (PSI). If there is an issue with BSS119NH7978XTSA1, 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 BSS119NH7978XTSA1 part is unused and in its original packaging.

Return procedure for BSS119NH7978XTSA1:

1.Submit a request within 90 days.

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

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