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

onsemi 2SD1682T

Name: 2SD1682T
Brand: onsemi
SKU: 2SD1682T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1682T

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: TO-225AA, TO-126-3

Datasheet:: 2SD1682T.pdf

Description:: TRANS NPN 50V 2.5A TO-126ML

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Product details

Overview

2SD1682T from SANYO is an NPN epitaxial planar silicon transistor rated for 50V V_CEO, 2.5A I_C, and 1.5W P_C at T_c=25°C, optimized for high-speed switching in relay drivers, lamp drivers, and DC power supplies. It features low V_CE(sat) (−100 mV typ. at I_C=−1A, I_B=−10mA), f_T = 140 MHz, and h_FE = 140–400 at I_C=−100mA.

For engineers reviewing the 2SD1682T datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) performance at 2.5A, TO-126ML package thermal resistance, h_FE binning (RSTU grade), and safe operating area (ASO) compliance under pulsed switching conditions.

Technical Context

This device operates as a medium-power NPN bipolar junction transistor with FBET/MBIT process technology enabling fast turn-on/turn-off times (t_on = 35 ns, t_off = 30 ns) and stable gain across temperature (h_FE maintained from −25°C to 75°C). Its V_CEO = 50V and V_CBO = 60V support robust voltage margin in inductive load switching.

The 2SD1682T is electrically characterized with fixed test conditions: V_CE = −2V for h_FE, V_CB = −10V for C_ob, and I_C = −50mA for f_T. Saturation parameters are specified at I_C/I_B = 20, matching standard driver interface design practices.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	50 V - Maximum collector-emitter voltage before breakdown; defines safe operating ceiling for 24V/48V DC supply switching.
I_C (max)	2.5 A - Continuous collector current rating; supports relay coils up to 2.5A and lamp loads >30W at 12V.
P_C (T_c=25°C)	1.5 W - Thermal power dissipation limit at case temperature; requires heatsinking above ~1.2A continuous operation.
V_CE(sat)	−100 mV (typ.) at I_C=−1A, I_B=−10mA - Low saturation voltage reduces conduction loss and self-heating in high-duty-cycle switches.
f_T	140 MHz - Gain-bandwidth product enables stable operation up to ~10–20 MHz switching frequencies with adequate gain margin.
h_FE	140–400 (RSTU grade, I_C=−100mA) - Tight DC current gain binning ensures predictable base drive requirements across production lots.
t_on/t_off	35 ns / 30 ns - Fast switching times minimize transition losses and EMI generation in PWM-controlled loads.

Pinout & Package

SANYO TO-126ML plastic molded package with integral heat slug; 3-pin through-hole mounting; pin 1 = Emitter, pin 2 = Collector (connected to tab), pin 3 = Base. Tab is electrically connected to collector for direct heatsink mounting with isolation washer required if heatsink is grounded.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for NPN operation	Connected to ground or low-side return; must handle full load current and be routed with low-inductance layout.
2 (Collector)	Current entry path; tied to metal tab	Electrically common with heatsink-mounting surface; requires insulating pad when heatsink is grounded to avoid short circuit.
3 (Base)	Control terminal for minority-carrier injection	Driven by TTL/CMOS-compatible logic via series resistor; base current must be sized per h_FE bin and I_C target.

Key Features

Feature	Design Value
Low V_CE(sat)	−100 mV typical at I_C=−1A ensures <0.1W conduction loss, critical for thermally constrained relay driver PCBs.
Wide ASO (Area of Safe Operation)	Validated up to 5A peak (10ms pulse) at V_CE=20V - supports inductive kickback energy absorption without secondary breakdown.
High f_T (140 MHz)	Enables clean square-wave switching at ≥10 MHz, reducing harmonic content and easing EMI filter design in high-frequency SMPS stages.
FBET/MBIT process	Delivers consistent h_FE and V_BE(sat) across temperature (−25°C to +75°C), minimizing base drive recalibration in industrial ambient.

Applications

Relay Driver Circuit	Lamp Dimming Module
Use Scenario: Driving 24V/2A electromagnetic relays in PLC I/O modules with 5V microcontroller GPIO control. IC Role / Device Role / Timing Role: NPN switch amplifying logic-level base current to deliver full coil current; operates in saturation during ON state. Use Value: Low V_CE(sat) limits relay coil voltage drop to ≤0.1V, ensuring reliable pull-in at end-of-life contact resistance.	Use Scenario: PWM-controlled 12V automotive incandescent lamp (28W) in dashboard backlighting system. IC Role / Device Role / Timing Role: High-current, high-speed switch modulating lamp current at 200 Hz–1 kHz; handles inductive flyback via built-in ASO margin. Use Value: 35 ns t_on/30 ns t_off minimizes dead-time distortion, preserving dimming linearity across 0–100% duty cycle.
DC Power Supply Output Stage	Industrial Solenoid Actuator
Use Scenario: Pass transistor in linear-regulated 5V/2A output stage of bench power supply with thermal foldback protection. IC Role / Device Role / Timing Role: Linear-mode current amplifier; dissipates up to 1.5W continuously with external heatsink. Use Value: 1.5W P_C rating and TO-126ML thermal path enable stable regulation without derating below 75°C ambient.	Use Scenario: 48V/1.8A solenoid valve driver in factory automation panel with 100 ms ON pulses. IC Role / Device Role / Timing Role: High-pulse-current switch handling 5A surge during solenoid pull-in; operates in active region during hold phase. Use Value: RSTU-grade h_FE (140–400) ensures consistent base drive sizing across production, eliminating field calibration.

Relay Driver Circuit

Lamp Dimming Module

Use Scenario: Driving 24V/2A electromagnetic relays in PLC I/O modules with 5V microcontroller GPIO control.

IC Role / Device Role / Timing Role: NPN switch amplifying logic-level base current to deliver full coil current; operates in saturation during ON state.

Use Value: Low V_CE(sat) limits relay coil voltage drop to ≤0.1V, ensuring reliable pull-in at end-of-life contact resistance.

Use Scenario: PWM-controlled 12V automotive incandescent lamp (28W) in dashboard backlighting system.

IC Role / Device Role / Timing Role: High-current, high-speed switch modulating lamp current at 200 Hz–1 kHz; handles inductive flyback via built-in ASO margin.

Use Value: 35 ns t_on/30 ns t_off minimizes dead-time distortion, preserving dimming linearity across 0–100% duty cycle.

DC Power Supply Output Stage

Industrial Solenoid Actuator

Use Scenario: Pass transistor in linear-regulated 5V/2A output stage of bench power supply with thermal foldback protection.

IC Role / Device Role / Timing Role: Linear-mode current amplifier; dissipates up to 1.5W continuously with external heatsink.

Use Value: 1.5W P_C rating and TO-126ML thermal path enable stable regulation without derating below 75°C ambient.

Use Scenario: 48V/1.8A solenoid valve driver in factory automation panel with 100 ms ON pulses.

IC Role / Device Role / Timing Role: High-pulse-current switch handling 5A surge during solenoid pull-in; operates in active region during hold phase.

Use Value: RSTU-grade h_FE (140–400) ensures consistent base drive sizing across production, eliminating field calibration.

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN high-speed switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SD1733	V_CEO = 60V, I_C = 3A, P_C = 2W, h_FE = 100–320 (no RSTU binning)	Higher voltage/current headroom but wider h_FE spread increases base resistor tolerance sensitivity.	Select 2SD1733 only when >50V bus voltage or >2.5A steady-state current is required; verify thermal design for 2W dissipation.
MJD127G	V_CEO = 100V, I_C = 2A, P_C = 1.5W, TO-220 package, h_FE = 100–300	Same power rating but larger TO-220 footprint and higher V_CE(sat) (−1.5V min), increasing conduction loss.	Choose MJD127G only if board layout allows TO-220 and system voltage exceeds 60V; not recommended for low-loss 24V relay drivers.

Compared with 2SD1682T, 2SD1733 offers higher voltage/current margins but looser h_FE control, while MJD127G trades package compatibility and saturation efficiency for elevated voltage capability-neither is pin-compatible, requiring PCB redesign.

Availability

2SD1682T is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and DC power supplies requiring stable component supply, consistent h_FE binning, and proven TO-126ML thermal reliability in industrial ambient.

Supply support for 2SD1682T 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

SANYO Electric Co., Ltd. was a Japanese semiconductor manufacturer specializing in power transistors, analog ICs, and optoelectronics before its acquisition by Panasonic in 2012; known for high-reliability discrete devices.

The 2SD1682T belongs to SANYO's high-speed switching transistor family designed specifically for industrial control interfaces where low saturation loss, tight gain consistency, and robust ASO are mandatory.

FAQ

What is the maximum continuous collector current rating for the 2SD1682T?

The 2SD1682T has a maximum continuous collector current (I_C) rating of 2.5 A at case temperature T_c = 25°C. This rating assumes proper heatsinking; derating is required above 25°C case temperature per the PC–Ta curve in the datasheet. At ambient temperature (T_a), sustained operation above ~1.2A typically requires a heatsink to maintain safe junction temperature.

Does the 2SD1682T have a defined h_FE binning specification?

Yes, the 2SD1682T is binned into the RSTU grade with h_FE = 140–400 at I_C = −100 mA and V_CE = −2 V. This tight gain range ensures predictable base drive requirements across production lots and simplifies design of fixed-resistor bias networks in relay and lamp driver circuits.

What package type does the 2SD1682T use, and how is the collector terminal connected?

The 2SD1682T uses the SANYO TO-126ML package, a 3-pin through-hole molded plastic case with an integral metal tab. Pin 2 (Collector) is electrically connected to the metal tab, which serves as the primary thermal path. When mounting to a heatsink, electrical isolation (e.g., mica washer + thermal grease) is required if the heatsink is grounded.

Can the 2SD1682T be used in linear regulator applications?

Yes, the 2SD1682T can operate in linear mode for low-noise, low-EMI regulation, provided power dissipation remains within its 1.5W limit at T_c = 25°C and junction temperature stays below 150°C. Its low V_CE(sat) and stable h_FE support precise current amplification, but thermal design must account for worst-case V_IN–V_OUT × I_LOAD dissipation.

What are the absolute maximum ratings for base-emitter reverse voltage on the 2SD1682T?

The absolute maximum V_BO (base-emitter reverse voltage) for the 2SD1682T is −6 V at T_a = 25°C. Exceeding this value-even momentarily-risks permanent degradation of the base-emitter junction. In microcontroller-driven applications, a clamping diode or series resistor limiting base current is recommended when driving inductive loads with flyback risk.

2SD1682T Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: TO-225AA, TO-126-3

Packaging:: Bulk

Product Status:: Active

Transistor Type:: NPN

Current - Collector (Ic) (Max):: 2.5 A

Voltage - Collector Emitter Breakdown (Max):: 50 V

Vce Saturation (Max) @ Ib, Ic:: 300mV @ 50mA, 1A

Current - Collector Cutoff (Max):: 100nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 100mA, 2V

Power - Max:: 1.5 W

Frequency - Transition:: 140MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126ML

2SD1682T FAQ

1.How can I place an order for 2SD1682T through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1682T 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 2SD1682T reliable?

The price and inventory of 2SD1682T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1682T is usually 5 days.

3.What payment methods are accepted for 2SD1682T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1682T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1682T?

2SD1682T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1682T 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 2SD1682T?

For technical support, including 2SD1682T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1682T requirements.

6.How does Aetrix verify that 2SD1682T is sourced from the original manufacturer or authorized distributors?

All 2SD1682T 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 2SD1682T meets industry standards.

7.What is the process for return or replacement of 2SD1682T?

All 2SD1682T units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1682T, 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 2SD1682T part is unused and in its original packaging.

Return procedure for 2SD1682T:

1.Submit a request within 90 days.

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

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