Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

STMicroelectronics 2STP535FP

Name: 2STP535FP
Brand: STMicroelectronics
SKU: 2STP535FP
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: 2STP535FP

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-220-3 Full Pack

Datasheet:: 2STP535FP.pdf

Description:: TRANS NPN DARL 180V 8A TO-220FP

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:919

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

2STP535FP from STMicroelectronics is a planar NPN power Darlington transistor in monolithic configuration with integrated antiparallel collector-emitter diode, rated for 180 V V_CEO, 8 A I_C, and 37 W P_tot at T_c ≤ 25 °C; used in electronic ignition systems where high DC current gain (h_FE = 1000–20000) and robust switching under inductive loads are required.

For engineers reviewing the 2STP535FP datasheet, 2STP535FP pinout, 2STP535FP application, or 2STP535FP equivalent, key selection criteria include its TO-220FP fully isolated package, 3.4 °C/W R_thj-case, integrated flyback diode (V_F = 2.8 V @ 10 A), V_CE(sat) = 2.5 V @ 8 A/80 mA, and 150 °C max junction temperature.

Technical Context

The 2STP535FP implements a monolithic Darlington pair with built-in antiparallel diode across C–E terminals, enabling self-commutated inductive load switching without external snubbers. Its high h_FE (min 1000 @ 3 A) reduces base drive requirements while maintaining saturation voltage below 2.5 V at full rated current.

Designed for high-reliability thermal cycling environments, it features a fully isolated TO-220FP package with R_thj-case = 3.4 °C/W and operates up to 150 °C junction temperature, supporting continuous conduction in motor control and alternator regulator circuits with minimal heatsinking.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	180 V - Sustains full supply voltage in automotive ignition and alternator field control without breakdown.
I_C	8 A continuous - Supports high-current switching in AC-DC motor drives and regulator output stages.
P_tot	37 W at T_c ≤ 25 °C - Enables compact thermal design when mounted on moderate heatsinks.
h_FE	1000–20000 @ I_C = 3–8 A - Reduces base driver complexity and power loss in discrete control logic interfaces.
V_F (diode)	2.8 V @ 10 A - Limits reverse recovery energy and clamps inductive kickback during turn-off.
R_thj-case	3.4 °C/W - Allows accurate junction temperature estimation for reliability validation in thermal simulations.

Pinout & Package

Package: TO-220FP fully isolated (plastic, metal tab electrically isolated from collector).

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitting terminal of Darlington pair	Low-side return path; connects to ground or load common in high-side switch configurations.
2 (Collector)	Output current sink node	Connected to inductive load (e.g., ignition coil primary); electrically isolated from mounting tab.
3 (Base)	Control input for Darlington pair	Drives both transistors; requires 80 mA for full 8 A saturation, enabling TTL/CMOS-compatible interface with series resistor.

Key Features

Feature	Design Value
Monolithic Darlington + integrated C–E diode	Eliminates need for external flyback diode, reducing BOM count and PCB footprint in ignition modules.
Very high DC current gain (h_FE ≥ 1000)	Permits direct drive from microcontroller GPIO or low-power logic gates without intermediate buffer stages.
TO-220FP fully isolated package	Enables safe mounting to shared heatsinks without electrical isolation hardware or insulating pads.
V_CE(sat) = 2.5 V @ 8 A	Limits conduction loss to ≤20 W at full load, improving thermal margin in sealed alternator regulator housings.

Applications

Electronic Ignition System

AC-DC Motor Control

Use Scenario: Switching primary current in automotive distributorless ignition coils with 300–400 V flyback spikes.

IC Role / Device Role / Timing Role: High-voltage, high-current Darlington switch controlling coil dwell time and spark timing.

Use Value: Integrated antiparallel diode clamps 400 V transients, while 180 V V_CEO and 15 A I_CM ensure single-pulse robustness.

Use Scenario: Controlling universal motor speed in power tools via phase-angle or PWM-based AC line switching.

IC Role / Device Role / Timing Role: Main power switch in half-wave or full-wave AC motor drive stage.

Use Value: 8 A continuous rating and 2.8 V diode forward drop suppress arcing during zero-cross commutation.

Alternator Field Regulator

Industrial Solenoid Driver

Use Scenario: Regulating rotor field current in 12 V/24 V vehicle alternators using duty-cycle-controlled switching.

IC Role / Device Role / Timing Role: Low-frequency (≤1 kHz) PWM switch modulating field winding current to maintain battery voltage.

Use Value: High h_FE enables direct drive from regulator IC output; 150 °C T_J rating supports under-hood ambient conditions.

Use Scenario: Driving 24 V DC solenoids in hydraulic valve manifolds requiring >5 A inrush current.

IC Role / Device Role / Timing Role: High-current DC switch interfacing PLC outputs to industrial actuators.

Use Value: 37 W power dissipation and 3.4 °C/W thermal resistance allow sustained operation without forced air cooling.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN Darlington transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TIP142	V_CEO = 100 V, h_FE = 1000 min, no integrated diode, TO-220 non-isolated	Requires external flyback diode; unsuitable for 180 V ignition systems	Select only if operating voltage ≤100 V and isolation not required.
BUX87	V_CEO = 160 V, I_C = 15 A, no integrated diode, TO-3 package	Larger footprint, higher thermal mass; needs external diode and insulator for heatsink mounting	Prefer for higher current but accept added BOM and layout complexity.

Compared with TIP142 and BUX87, the 2STP535FP uniquely combines 180 V rating, integrated diode, and fully isolated TO-220FP packaging-reducing component count, simplifying thermal design, and eliminating external protection components in automotive and industrial switching applications.

Availability

2STP535FP is available at Aetrix Electronics and suitable for electronic ignition systems, AC-DC motor control circuits, and alternator field regulators requiring stable component supply and long-term industrial availability.

Supply support for 2STP535FP 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 and discrete power devices for industrial, automotive, and consumer markets.

The 2STP535FP belongs to ST's high-voltage power transistor family, engineered specifically for ruggedized switching in automotive ignition, alternator regulation, and industrial actuator control where reliability under thermal and electrical stress is critical.

FAQ

Is the 2STP535FP pin-compatible with standard TO-220 NPN transistors?

No. While it uses the TO-220FP outline, the pin order is E–C–B (Emitter, Collector, Base), differing from conventional TO-220 NPN parts like TIP31 (C–B–E). Mounting orientation and PCB footprint must match ST's mechanical drawing, and the isolated tab requires no insulator but must be verified for circuit ground reference.

Does the integrated diode support bidirectional current flow?

No. The integrated antiparallel diode conducts only from emitter to collector (forward-biased when collector is negative relative to emitter), providing unidirectional flyback protection during inductive turn-off. It does not enable reverse conduction or H-bridge functionality.

What is the maximum safe operating frequency for PWM switching?

The 2STP535FP is optimized for low-frequency switching (≤5 kHz), typical in ignition dwell control and alternator regulation. At 1 kHz, measured V_CE(sat) rise is <5% due to minority carrier storage; above 10 kHz, switching losses increase significantly and h_FE degrades, limiting practical use to non-high-speed applications.

Can the 2STP535FP replace a MOSFET in motor control?

Only in low-frequency, high-current linear or saturated-switching roles where gate drive simplicity and cost outweigh efficiency needs. Unlike MOSFETs, it has 2.5 V V_CE(sat) and slower turn-off (µs range), resulting in higher conduction and switching losses above 1 kHz-making it unsuitable for high-efficiency or high-frequency motor inverters.

2STP535FP Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3 Full Pack

Packaging:: Tube

Product Status:: Active

Transistor Type:: NPN - Darlington

Current - Collector (Ic) (Max):: 8 A

Voltage - Collector Emitter Breakdown (Max):: 180 V

Vce Saturation (Max) @ Ib, Ic:: 2.5V @ 80mA, 8A

Current - Collector Cutoff (Max):: 50µA

DC Current Gain (hFE) (Min) @ Ic, Vce:: 1000 @ 3A, 4V

Power - Max:: 37 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220FP

2STP535FP FAQ

1.How can I place an order for 2STP535FP through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STP535FP 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 2STP535FP reliable?

The price and inventory of 2STP535FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STP535FP is usually 5 days.

3.What payment methods are accepted for 2STP535FP?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STP535FP transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STP535FP?

2STP535FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STP535FP 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 2STP535FP?

For technical support, including 2STP535FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STP535FP requirements.

6.How does Aetrix verify that 2STP535FP is sourced from the original manufacturer or authorized distributors?

All 2STP535FP 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 2STP535FP meets industry standards.

7.What is the process for return or replacement of 2STP535FP?

All 2STP535FP units undergo pre-shipment inspection (PSI). If there is an issue with 2STP535FP, 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 2STP535FP part is unused and in its original packaging.

Return procedure for 2STP535FP:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…