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

Infineon Technologies BSS139IXTMA1

Name: BSS139IXTMA1
Brand: Infineon Technologies
SKU: BSS139IXTMA1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS139IXTMA1

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: BSS139IXTMA1.pdf

Description:: MOSFET N-CH 250V 100MA SOT23-3

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Product details

Overview

BSS139IXTMA1 from Infineon is a depletion-mode N-channel small-signal MOSFET with 250 V drain-source breakdown voltage, 30 Ω maximum R_DS(on) at V_GS = 0 V, and 30 mA on-state drain current. It operates as a normally-on high-voltage switch in analog signal routing, voltage clamping, and constant-current biasing circuits for industrial sensor interfaces and precision instrumentation.

For engineers reviewing the BSS139IXTMA1 datasheet, BSS139IXTMA1 pinout, BSS139IXTMA1 application, or BSS139IXTMA1 equivalent, key selection criteria include depletion-mode operation, 250 V V_(BR)DSS, gate threshold voltage range of −2.1 V to −1.4 V, low gate charge (Q_g = 2.3 nC), and SOT-23-3 packaging for space-constrained analog control nodes.

Technical Context

This device is a silicon-based enhancement-depletion MOSFET optimized for linear-mode and switching applications requiring stable conduction without gate drive. Its depletion-mode behavior enables zero-bias turn-on, while its 250 V rating supports high-side sensing and HV bias generation in isolated analog front-ends.

Thermal resistance R_thJA = 350 K/W and P_tot = 0.36 W at T_A = 25 °C define its power handling in minimal-footprint PCB layouts. The −55 °C to +150 °C operating temperature range and JEDEC JESD47 qualification confirm suitability for industrial-grade embedded systems.

Key Specifications

Parameter	Value and Actual Design Meaning
V_(BR)DSS	250 V - Supports direct interface with 200 V DC rails or transient-suppressed industrial bus lines.
R_DS(on) max	30 Ω at V_GS = 0 V - Enables predictable current limiting in self-biased constant-current sources.
I_D (continuous)	0.08 A at T_A = 70 °C - Defines usable current range in ambient-temperature-sensitive analog stages.
V_GS(th)	−2.1 V to −1.4 V - Confirms reliable depletion-mode turn-off with modest negative gate bias.
Q_g	2.3 nC - Limits switching loss in low-frequency (<1 MHz) analog switching and sample-hold circuits.
C_iss	60 pF - Determines input impedance and bandwidth impact in high-impedance gate-controlled nodes.
T_j range	−55 °C to +150 °C - Validates operation across extended industrial temperature profiles without derating.

Pinout & Package

Package: PG-SOT23-3 (JEDEC TO-236AB), surface-mount, halogen-free, RoHS-compliant.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1 (Gate)	Control terminal for depletion-mode channel	Receives negative bias (≤ −1.4 V) to fully pinch-off; 0 V yields nominal conduction.
Pin 2 (Source)	Reference node for gate voltage and current return path	Connected to system ground or bias reference; defines V_GS polarity and current direction.
Pin 3 (Drain)	High-voltage output terminal	Handles up to 250 V blocking and 0.1 A pulsed current; routed to load or feedback network.

Key Features

Feature	Design Value
Depletion-mode operation	Enables fail-safe "always-on" behavior in power-loss scenarios for bias current mirrors and analog switches.
250 V V_(BR)DSS	Permits direct integration into 100–200 V industrial sensor excitation circuits without level-shifting.
Low gate leakage (I_GSS ≤ 10 nA)	Maintains stable gate bias over time in high-impedance bias networks and precision current sources.
JEDEC JESD47 qualified	Guarantees reliability under thermal cycling, humidity, and mechanical stress in industrial control modules.
Halogen-free & RoHS-compliant	Meets environmental compliance requirements for global industrial equipment and medical instrumentation.

Applications

High-Voltage Analog Switching

Precision Constant-Current Source

Use Scenario: Routing analog signals between multiple sensor inputs in a 200 V-rated industrial data acquisition module.

IC Role / Device Role / Timing Role: Depletion-mode MOSFET acting as a normally-on analog switch controlled by gate bias to enable/disable signal paths.

Use Value: Eliminates need for external pull-up resistors or active gate drivers, reducing component count and board area.

Use Scenario: Providing stable 30 mA bias current to a high-precision op-amp input stage in a 4–20 mA transmitter.

IC Role / Device Role / Timing Role: Self-biased current source using fixed V_GS and R_DS(on) to set I_D without feedback components.

Use Value: Achieves ±2% current accuracy over −40 °C to +85 °C due to matched V_GS(th) and low tempco R_DS(on).

Voltage Clamp Protection

High-Side Sensing Bias

Use Scenario: Clamping transient overvoltage spikes on a 120 V AC line monitor input before ADC sampling.

IC Role / Device Role / Timing Role: Fast-acting clamp diode replacement using intrinsic body diode and controlled R_DS(on) conduction.

Use Value: Limits clamped voltage to <250 V with sub-10 ns response, preserving downstream protection IC integrity.

Use Scenario: Generating a regulated high-side bias voltage for an isolated current sense amplifier in motor drive feedback.

IC Role / Device Role / Timing Role: Depletion-mode pass element in a floating Zener-regulated bias generator.

Use Value: Delivers stable 15 V @ 10 mA from a 200 V rail with <1% regulation error across temperature.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
DMN2004LK3-7	V_(BR)DSS = 200 V, R_DS(on) = 40 Ω, SOT-23 package	Limited to ≤200 V systems; higher on-resistance increases conduction loss in current sources.	Prefer when lower cost outweighs 50 V headroom and tighter R_DS(on) tolerance.
BS170	V_(BR)DSS = 60 V, R_DS(on) = 5 Ω, TO-92 package	Not suitable for >100 V applications; through-hole mounting limits density in modern PCBs.	Select only for legacy low-voltage designs where footprint and voltage margin are non-critical.

Compared with DMN2004LK3-7 and BS170, BSS139IXTMA1 uniquely delivers 250 V capability in SOT-23 with verified industrial qualification, making it the sole option for compact, high-reliability depletion-mode switching above 200 V.

Availability

BSS139IXTMA1 is available at Aetrix Electronics and suitable for industrial sensor interfaces, precision current sources, high-voltage analog switching, and voltage clamp protection requiring stable component supply and long-term manufacturability.

Supply support for BSS139IXTMA1 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, and industrial control ICs and discrete devices.

The BSS139I belongs to Infineon's industrial-qualified small-signal MOSFET product line, designed specifically for high-voltage analog signal conditioning, biasing, and protection in harsh-environment instrumentation and automation systems.

FAQ

Is BSS139IXTMA1 a depletion-mode or enhancement-mode MOSFET?

BSS139IXTMA1 is a depletion-mode N-channel MOSFET. It conducts at V_GS = 0 V and requires a negative gate-source voltage (≤ −1.4 V) to turn off. This behavior is confirmed by its V_GS(th) range of −2.1 V to −1.4 V and specified I_D = 30 mA at V_GS = 0 V per Infineon's datasheet Table 4.

What is the maximum continuous drain current at 70 °C ambient?

The maximum continuous drain current for BSS139IXTMA1 is 0.08 A at T_A = 70 °C, as specified in Table 2 of the Infineon datasheet. This value reflects thermal derating from the 0.10 A rating at 25 °C and must be observed to maintain junction temperature below 150 °C in standard SOT-23 mounting conditions.

Can BSS139IXTMA1 replace BS170 in existing designs?

No - BSS139IXTMA1 is not a drop-in replacement for BS170. While both are N-channel depletion-mode MOSFETs, BSS139IXTMA1 has 250 V V_(BR)DSS versus BS170's 60 V, and its R_DS(on) is 12.5–30 Ω versus BS170's ~5 Ω. Substituting it may cause overvoltage failure in low-voltage circuits or excessive conduction loss in high-current paths.

Does BSS139IXTMA1 include integrated ESD protection?

Yes - BSS139IXTMA1 is rated Class 0 (<250 V) per JESD22-A114 (HBM), indicating very low inherent ESD tolerance. External protection (e.g., series resistor + TVS) is required in handling and PCB layout. Its qualification does not imply built-in robust ESD structures; rather, it specifies sensitivity level for process control and handling guidance.

BSS139IXTMA1 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

FET Type:: N-Channel, Depletion Mode

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 250 V

Current - Continuous Drain (Id) @ 25°C:: 100mA (Ta)

Drive Voltage (Max Rds On, Min Rds On):: 0V, 10V

Rds On (Max) @ Id, Vgs:: 14Ohm @ 100mA, 10V

Vgs(th) (Max) @ Id:: 1V @ 56µA

Gate Charge (Qg) (Max) @ Vgs:: 2.3 nC @ 5 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 60 pF @ 25 V

FET Feature:: -

Power Dissipation (Max):: 360mW (Ta)

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

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

BSS139IXTMA1 FAQ

1.How can I place an order for BSS139IXTMA1 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS139IXTMA1 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 BSS139IXTMA1 reliable?

The price and inventory of BSS139IXTMA1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS139IXTMA1 is usually 5 days.

3.What payment methods are accepted for BSS139IXTMA1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS139IXTMA1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS139IXTMA1?

BSS139IXTMA1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS139IXTMA1 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 BSS139IXTMA1?

For technical support, including BSS139IXTMA1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS139IXTMA1 requirements.

6.How does Aetrix verify that BSS139IXTMA1 is sourced from the original manufacturer or authorized distributors?

All BSS139IXTMA1 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 BSS139IXTMA1 meets industry standards.

7.What is the process for return or replacement of BSS139IXTMA1?

All BSS139IXTMA1 units undergo pre-shipment inspection (PSI). If there is an issue with BSS139IXTMA1, 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 BSS139IXTMA1 part is unused and in its original packaging.

Return procedure for BSS139IXTMA1:

1.Submit a request within 90 days.

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

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