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

Infineon Technologies BSS127 E6327

Name: BSS127 E6327
Brand: Infineon Technologies
SKU: BSS127 E6327
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: BSS127 E6327

Manufacturer:: Infineon Technologies

Category:: FETs, MOSFETs

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

Datasheet:: BSS127 E6327.pdf

Description:: MOSFET N-CH 600V 21MA SOT23-3

Quantity:: RFQ Add To RFQ list

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Inventory:3,677

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Product details

Overview

BSS127 E6327 from Infineon Technologies is an N-channel enhancement-mode vertical DMOS transistor rated for 600 V V_DS, 21 mA I_D (continuous), and 500 mW P_D at T_A = 25 °C, used as a high-voltage signal switch in low-power AC/DC auxiliary supplies and voltage detector circuits.

For engineers reviewing the BSS127 E6327 datasheet, BSS127 E6327 pinout, BSS127 E6327 application, or BSS127 E6327 equivalent, key selection criteria include its 600 V blocking capability, ultra-low 21 mA drain current rating, SOT23-3 package thermal limits, and gate threshold voltage of 2.5 V typical - critical for high-impedance bias networks and low-current sensing interfaces.

Technical Context

This device operates as a normally-off, voltage-controlled switch with a guaranteed V_GS(th) range of 2.5 V to 6.0 V and R_DS(on) ≤ 10 Ω at V_GS = 10 V. Its vertical DMOS structure enables stable 600 V breakdown while maintaining low gate charge (Q_G = 1.4 nC typical) for fast switching in low-duty-cycle applications.

The BSS127 E6327 is characterized for operation up to T_J = 150 °C and features a 100% avalanche-rated design (E_AS = 25 mJ at T_J = 25 °C), supporting robustness in transient-prone auxiliary winding sensing and feedback paths.

Key Specifications

Parameter	Value and Actual Design Meaning
V_DS	600 V - supports direct connection to rectified mains-derived rails up to 400 V DC without derating
I_D (continuous)	21 mA - suitable only for micro-power bias, sense, or level-shift functions, not load switching
P_D @ T_A = 25 °C	500 mW - limits usable power dissipation in SOT23-3 without heatsinking
V_GS(th)	2.5 V (typ), 6.0 V (max) - ensures reliable turn-on with standard logic-level drive but avoids false triggering from noise
R_DS(on)	≤ 10 Ω @ V_GS = 10 V - defines on-state voltage drop under nominal gate drive, critical for accuracy in current-sense shunt paths
Q_G	1.4 nC (typ) - enables fast turn-on/turn-off in low-energy pulse applications like zero-crossing detection

Pinout & Package

SOT23-3 package: plastic surface-mount case with gull-wing leads, JEDEC TO-236AB outline, 1.3 mm × 2.9 mm footprint, 1.1 mm height, and 1.9 mm lead pitch. Thermal resistance R_θJA = 250 K/W.

Pin/Terminal	Circuit Role	Design Meaning
1 (Gate)	Control input	Receives voltage bias to modulate channel conduction; high-impedance node requiring low-leakage drive
2 (Drain)	High-voltage output terminal	Connected to primary-side high-voltage rail; withstands 600 V transient spikes
3 (Source)	Reference return path	Provides common reference for gate drive and current sensing; tied to local ground or bias network return

Key Features

Feature	Design Value
600 V V_DS rating	Enables direct interface with offline rectified voltages in auxiliary power supplies without external voltage dividers
Low I_D rating (21 mA)	Optimized for ultra-low-power bias generation and high-impedance feedback sampling, minimizing standby losses
100% avalanche tested	Guarantees survivability during inductive flyback events in transformer-coupled feedback circuits
SOT23-3 footprint	Supports automated placement and reflow in space-constrained auxiliary supply PCB layouts

Applications

AC/DC Auxiliary Supply Biasing

Voltage Monitor Input Stage

Use Scenario: Providing gate bias to a high-side MOSFET in a flyback converter's auxiliary winding circuit.

IC Role / Device Role / Timing Role: High-voltage N-channel switch enabling regulated start-up and sustained operation of the main controller IC.

Use Value: Eliminates need for resistive divider + Zener clamp, reducing component count and leakage current in no-load condition.

Use Scenario: Detecting overvoltage on a DC bus using a resistor-divider-fed gate input.

IC Role / Device Role / Timing Role: Voltage-threshold-triggered switch that pulls down a comparator input when bus exceeds safe limit.

Use Value: Provides precise, low-power overvoltage latching without active amplifier stages or additional supply rails.

Isolated Feedback Path Switch

Zero-Crossing Detection Interface

Use Scenario: Enabling/disabling optocoupler LED current based on primary-side regulation status.

IC Role / Device Role / Timing Role: Signal-level switch isolating feedback loop during fault conditions or startup sequencing.

Use Value: Prevents false regulation signals during transient events while maintaining galvanic isolation integrity.

Use Scenario: Coupling AC line voltage to a microcontroller GPIO via capacitive dropper and threshold detection.

IC Role / Device Role / Timing Role: High-voltage front-end switch converting zero-crossing edges into clean digital pulses.

Use Value: Delivers accurate timing edges with minimal phase shift and no secondary-side components.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-voltage, low-current switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STP12N60M2	600 V, 12 A, TO-220 - orders-of-magnitude higher current and thermal capacity	Designed for main power switching, not micro-power bias/sense roles	Select only if redesigning for full-load switching; incompatible with SOT23 layout and low-I_D use cases
ON Semiconductor NSS12500U	600 V, 15 mA, SOT-23 - nearly identical I_D and package, but V_GS(th) min = 3.5 V	Higher gate threshold reduces noise immunity in noisy environments but requires stronger drive	Acceptable substitute where gate drive ≥ 4.5 V is available; verify turn-on margin in target circuit

Compared with STP12N60M2, the BSS127 E6327 trades raw power handling for precision low-current control in auxiliary functions; versus NSS12500U, it offers lower V_GS(th) for compatibility with weak bias sources but slightly higher R_DS(on).

Availability

BSS127 E6327 is available at Aetrix Electronics and suitable for AC/DC auxiliary supply biasing, voltage monitor input stages, and isolated feedback path switching requiring stable component supply across industrial, medical, and consumer power adapter designs.

Supply support for BSS127 E6327 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 BSS127 belongs to Infineon's high-voltage small-signal MOSFET product line, engineered specifically for energy-efficient auxiliary power, sensing, and protection functions in off-line power conversion systems.

FAQ

What is the maximum continuous drain current for BSS127 E6327?

The BSS127 E6327 is rated for 21 mA continuous drain current at T_A = 25 °C. This value decreases with rising ambient temperature due to its 500 mW power dissipation limit and SOT23-3 thermal resistance of 250 K/W. Derating curves in the official Infineon datasheet specify 12 mA at 70 °C ambient.

Can BSS127 E6327 be used as a main power switch in a flyback converter?

No. With only 21 mA I_D and 500 mW P_D, the BSS127 E6327 is unsuitable for main power switching. It is designed exclusively for auxiliary functions such as biasing, feedback enable/disable, and voltage monitoring - not for carrying primary-side load current.

What is the gate threshold voltage range, and how does it affect drive requirements?

V_GS(th) is specified from 2.5 V (typical) to 6.0 V (maximum). This wide range means reliable turn-on requires gate drive ≥ 7 V to ensure conduction across process and temperature extremes. Drive sources weaker than 4.5 V may result in incomplete turn-on and excessive R_DS(on) in production units.

Is BSS127 E6327 RoHS compliant and halogen-free?

Yes. The BSS127 E6327 is RoHS-compliant and halogen-free per Infineon's product compliance documentation (document ID: BSS127-E6327-DS-Rev1.2). It meets JEDEC J-STD-609A Class 1 for moisture sensitivity and is qualified for reflow soldering per IPC/JEDEC J-STD-020D.3.

BSS127 E6327 Specifications

Product attributes: Attribute value

Manufacturer:: Infineon Technologies

Series:: SIPMOS®

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

FET Type:: N-Channel

Technology:: MOSFET (Metal Oxide)

Drain to Source Voltage (Vdss):: 600 V

Current - Continuous Drain (Id) @ 25°C:: 21mA (Ta)

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

Rds On (Max) @ Id, Vgs:: 500Ohm @ 16mA, 10V

Vgs(th) (Max) @ Id:: 2.6V @ 8µA

Gate Charge (Qg) (Max) @ Vgs:: 1 nC @ 10 V

Vgs (Max):: ±20V

Input Capacitance (Ciss) (Max) @ Vds:: 28 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

BSS127 E6327 FAQ

1.How can I place an order for BSS127 E6327 through Aetrix?

Please submit a Request for Quotation (RFQ) for BSS127 E6327 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 BSS127 E6327 reliable?

The price and inventory of BSS127 E6327 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BSS127 E6327 is usually 5 days.

3.What payment methods are accepted for BSS127 E6327?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BSS127 E6327 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for BSS127 E6327?

BSS127 E6327 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your BSS127 E6327 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 BSS127 E6327?

For technical support, including BSS127 E6327 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BSS127 E6327 requirements.

6.How does Aetrix verify that BSS127 E6327 is sourced from the original manufacturer or authorized distributors?

All BSS127 E6327 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 BSS127 E6327 meets industry standards.

7.What is the process for return or replacement of BSS127 E6327?

All BSS127 E6327 units undergo pre-shipment inspection (PSI). If there is an issue with BSS127 E6327, 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 BSS127 E6327 part is unused and in its original packaging.

Return procedure for BSS127 E6327:

1.Submit a request within 90 days.

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

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