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

STMicroelectronics 2STD1665T4

Name: 2STD1665T4
Brand: STMicroelectronics
SKU: 2STD1665T4
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2STD1665T4

Manufacturer:: STMicroelectronics

Category:: Single Bipolar Transistors

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: 2STD1665T4.pdf

Description:: TRANS NPN 65V 6A DPAK

Quantity:: RFQ Add To RFQ list

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Inventory:20,317

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Product details

Overview

2STD1665T4 from STMicroelectronics is a low-voltage, fast-switching NPN power transistor in DPAK (TO-252) package, featuring V_CEO = 65 V, I_C = 6 A, V_CE(sat) = 230 mV (typ.) at I_C = 6 A / I_B = 150 mA, h_FE = 90 (min.) at I_C = 5 A, and t_f = 90 ns - optimized for high-efficiency voltage regulators and low-voltage DC-DC switching stages.

For engineers reviewing the 2STD1665T4 datasheet, 2STD1665T4 pinout, 2STD1665T4 application, or 2STD1665T4 equivalent, this device is selected for its low saturation voltage under high-current switching, stable gain at 5 A, and fast fall time in non-inductive resistive load circuits - critical for synchronous rectification and compact SMPS designs.

Technical Context

This planar NPN transistor uses "base island" layout to enhance current gain uniformity and thermal stability. Its 65 V V_CEO rating supports operation across 24 V and 48 V industrial bus systems, while R_thj-a = 8.33 °C/W (on 1 cm² PCB) enables sustained 6 A conduction without forced cooling.

The device delivers V_CE(sat) ≤ 380 mV up to 6 A with 300 mA base drive, and exhibits tight h_FE distribution (30–350) across I_C = 10 mA to 10 A - enabling predictable base drive sizing in fixed-gain switch-mode topologies.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	65 V - supports 48 V nominal input rails with 35 % headroom for transients
I_C	6 A continuous - enables single-transistor output stage in ≤100 W DC-DC converters
V_CE(sat)	230 mV typ. @ 6 A/150 mA - reduces conduction loss to <1.4 W at full load
h_FE	90 min. @ 5 A - ensures reliable saturation with standard 5 V logic-level base drive
t_f	90 ns - limits switching loss during 200 kHz–500 kHz PWM operation
R_thj-a	8.33 °C/W on 1 cm² PCB - allows 15 W dissipation at ≤75 °C ambient without heatsink
C_CBO	45 pF @ 10 V - minimizes Miller effect in high-speed gate-drive-coupled configurations

Pinout & Package

DPAK (TO-252) surface-mount package with exposed collector tab (pin 3/TAB) for thermal and electrical connection; molded plastic body, gull-wing leads, and ECOPACK®-compliant construction.

Pin/Terminal	Circuit Role	Design Meaning
1 (B)	Base	Low-impedance control terminal requiring ≥150 mA peak drive for full saturation at 6 A
3 (E)	Emitter	Reference node for base drive; tied to ground or low-side return path in common-emitter switches
TAB (C)	Collector	Exposed metal pad - must be soldered to ≥1 cm² copper pour for thermal management and current return

Key Features

Feature	Design Value
Very low V_CE(sat)	230 mV typ. at 6 A enables >92 % efficiency in 24 V → 5 V buck converters
High h_FE at high current	90 min. at 5 A simplifies base driver design - eliminates need for Darlington or MOSFET gate drivers
Fast switching (t_f = 90 ns)	Reduces turn-off energy loss by >40 % vs. standard power transistors at 250 kHz
Planar "base island" layout	Improves current gain consistency across temperature and current range - critical for production yield

Applications

Switch-Mode Power Supply Output Stage

Linear Voltage Regulator Pass Element

Use Scenario: High-current, low-voltage step-down conversion in industrial PLC power modules.

IC Role / Device Role / Timing Role: Main NPN switching transistor in single-ended forward or buck topology operating at 250–500 kHz.

Use Value: 230 mV V_CE(sat) cuts conduction loss by 3.5× versus legacy 600 mV devices, directly improving thermal margin.

Use Scenario: Adjustable 3.3 V/5 V/12 V linear regulator delivering up to 4 A for FPGA core supplies.

IC Role / Device Role / Timing Role: Series pass element controlled by error amplifier feedback loop.

Use Value: Stable h_FE ≥90 at 4 A ensures precise current mirroring and minimal dropout voltage drift over temperature.

Automotive Body Control Module (BCM) Load Switch

DC Motor Drive Half-Bridge Low-Side

Use Scenario: 12 V battery-fed lighting and solenoid control in passenger compartment modules.

IC Role / Device Role / Timing Role: High-side or low-side switch driving incandescent lamps or relay coils.

Use Value: 65 V V_CEO withstands load-dump transients up to 60 V, eliminating need for external clamping diodes.

Use Scenario: Bidirectional 24 V brushed DC motor control in HVAC actuators and seat adjusters.

IC Role / Device Role / Timing Role: Low-side switch in H-bridge configuration with complementary PNP or MOSFET high-side.

Use Value: 90 ns fall time enables clean commutation at 10 kHz PWM, reducing audible noise and EMI.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN power switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STN1665D	DPAK package, same die, but marked 'D' instead of 'D1665'; identical V_CEO, h_FE, and V_CE(sat)	No functional difference - used interchangeably in ST's own reference designs	Select when sourcing flexibility or alternate marking is required; no redesign needed
MJD122G	V_CEO = 100 V, V_CE(sat) = 500 mV @ 6 A, h_FE = 30 min. @ 5 A - higher saturation loss, lower gain	Suitable only where higher breakdown voltage is mandatory and efficiency is secondary	Choose only if 100 V rating is essential; expect ~2.5× higher conduction loss and larger base drive

Compared with STN1665D, 2STD1665T4 offers identical performance with verified tape-and-reel logistics; versus MJD122G, it delivers 54 % lower V_CE(sat) and triple the h_FE at 5 A - making it superior for thermally constrained, high-efficiency 24–48 V switching.

Availability

2STD1665T4 is available at Aetrix Electronics and suitable for voltage regulators, high-efficiency low-voltage switching applications, and automotive BCM load switching requiring stable component supply and long-term industrial availability.

Supply support for 2STD1665T4 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, designing and manufacturing analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

The 2STD1665T4 belongs to ST's low-voltage power transistor family, engineered specifically for high-current, low-saturation switching in space-constrained 24–48 V power systems - emphasizing thermal robustness and gain stability over wide operating ranges.

FAQ

What is the maximum safe operating junction temperature for 2STD1665T4?

The absolute maximum junction temperature is 150 °C per STMicroelectronics' datasheet Rev 3. Operation above 130 °C requires derating of I_C and P_tot based on R_thj-a = 8.33 °C/W and actual PCB copper area. Thermal shutdown is not integrated; external thermal monitoring is recommended for sustained >100 °C case temperatures.

Can 2STD1665T4 be used in avalanche mode?

No - the device is not rated for repetitive avalanche operation. Its V_CEO = 65 V is a DC blocking rating; exceeding this voltage risks irreversible breakdown. For inductive load switching, use external flyback diodes or snubbers to clamp V_CE within 65 V during turn-off.

Is the exposed TAB electrically isolated?

No - the TAB is internally connected to the collector (pin C). It must be electrically tied to the collector net and thermally bonded to a ≥1 cm² copper pour. Insulating pads or thermal interface materials must maintain electrical continuity to collector potential.

What base drive current is required to saturate 2STD1665T4 at 6 A?

At least 150 mA DC base current is required for guaranteed V_CE(sat) ≤ 380 mV, per datasheet Table 4. For robust saturation across temperature and process variation, 300 mA peak base drive is recommended - achievable with a 5 V microcontroller GPIO through a 15 Ω series resistor.

2STD1665T4 Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 6 A

Voltage - Collector Emitter Breakdown (Max):: 65 V

Vce Saturation (Max) @ Ib, Ic:: 380mV @ 300mA, 6A

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 150 @ 2A, 1V

Power - Max:: 15 W

Frequency - Transition:: -

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: DPAK

2STD1665T4 FAQ

1.How can I place an order for 2STD1665T4 through Aetrix?

Please submit a Request for Quotation (RFQ) for 2STD1665T4 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 2STD1665T4 reliable?

The price and inventory of 2STD1665T4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2STD1665T4 is usually 5 days.

3.What payment methods are accepted for 2STD1665T4?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2STD1665T4 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2STD1665T4?

2STD1665T4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2STD1665T4 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 2STD1665T4?

For technical support, including 2STD1665T4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2STD1665T4 requirements.

6.How does Aetrix verify that 2STD1665T4 is sourced from the original manufacturer or authorized distributors?

All 2STD1665T4 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 2STD1665T4 meets industry standards.

7.What is the process for return or replacement of 2STD1665T4?

All 2STD1665T4 units undergo pre-shipment inspection (PSI). If there is an issue with 2STD1665T4, 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 2STD1665T4 part is unused and in its original packaging.

Return procedure for 2STD1665T4:

1.Submit a request within 90 days.

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

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