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

onsemi 2SD1725T

Name: 2SD1725T
Brand: onsemi
SKU: 2SD1725T
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1725T

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SD1725T.pdf

Description:: TRANS NPN 100V 4A TO-126LP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SD1725T from SANYO is an NPN epitaxial planar silicon transistor designed for large-current switching applications, with V_CEO = −100 V, I_C = −4 A, P_C = 1.2 W at T_A = 25 °C, and f_T = 130 MHz - used in relay drivers, high-speed inverters, and DC-DC converters.

For engineers reviewing the 2SD1725T datasheet, pinout, applications, or equivalent options, key selection criteria include guaranteed h_FE range (140–280 at I_C = −0.5 A), low V_CE(sat) (−200 mV max at I_C = −2 A, I_B = −0.2 A), and TO-126LP package thermal performance under pulsed and DC operation.

Technical Context

The 2SD1725T operates as a medium-power NPN bipolar junction transistor optimized for fast switching in industrial power control circuits. Its design emphasizes low saturation voltage, high current gain linearity across I_C = −0.01 A to −3 A, and stable f_T > 100 MHz at V_CE = −10 V, I_C = −0.5 A.

It features a monolithic epitaxial planar structure with emitter ballasting for improved second breakdown immunity and uniform current distribution. The device supports both DC and pulsed operation up to I_CP = −8 A (100 µs, duty cycle ≤ 1%), with thermal derating defined for T_A and T_C per JEDEC TO-126LP limits.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V: Maximum collector-to-emitter voltage before breakdown under open-base condition - sets safe operating voltage ceiling in switching topologies.
I_C (DC)	−4 A: Continuous collector current rating at T_A = 25 °C - defines steady-state load drive capability without heatsink.
P_C	1.2 W: Maximum power dissipation at ambient temperature - determines thermal margin in compact PCB layouts.
f_T	130 MHz: Gain-bandwidth product at V_CE = −10 V, I_C = −0.5 A - enables reliable operation in sub-100 ns switching applications.
V_CE(sat)	−200 mV max at I_C = −2 A, I_B = −0.2 A: Low saturation voltage reduces conduction loss in high-current switch nodes.
h_FE	140–280 at V_CE = −5 V, I_C = −0.5 A: Tight DC current gain binning ensures predictable base drive requirements.
t_ON/t_OFF	100 ns / 80 ns typical: Fast switching times support PWM frequencies up to ~1 MHz in converter designs.

Pinout & Package

2SD1725T uses the TO-126LP plastic package (SANYO designation), with standard lead configuration: Emitter (Pin 1), Collector (Pin 2), Base (Pin 3). The collector tab is electrically connected to Pin 2 and serves as primary heat path.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit node for NPN operation	Connected to ground or low-side return path; requires low-inductance routing for fast switching.
2 (Collector)	Current entry node; tied to collector tab	Tab must be mounted to heatsink or copper pour; electrically active - isolation required if heatsink is grounded.
3 (Base)	Control terminal for minority-carrier injection	Driven by TTL/CMOS-compatible logic or dedicated driver; requires series resistor to limit I_B and prevent overdrive.

Key Features

Feature	Design Value
Low V_CE(sat)	−200 mV max at I_C = −2 A ensures <1.2 W conduction loss at full rated current - critical for thermal management in sealed enclosures.
High f_T	130 MHz bandwidth supports clean square-wave switching up to 100 kHz with minimal rise/fall time degradation.
Linear h_FE	Stable gain across I_C = −0.01 A to −3 A enables accurate analog current amplification and predictable digital switching thresholds.
Short switching time	t_ON = 100 ns, t_OFF = 80 ns - minimizes overlap loss in complementary-switching configurations like H-bridges.

Applications

Relay Driver Circuit	DC-DC Converter Switch
Use Scenario: Driving 24 V, 100 mA coil relays in industrial PLC output modules. IC Role / Device Role / Timing Role: NPN switch controlling relay coil current path with TTL-level base input. Use Value: V_CE(sat) ≤ −200 mV ensures <20 mW coil-side loss and eliminates need for snubber diodes in most cases.	Use Scenario: High-side switch in 12 V → 5 V buck converter operating at 200 kHz. IC Role / Device Role / Timing Role: Main power switch handling peak I_C = −3.5 A pulses with 50% duty cycle. Use Value: f_T = 130 MHz and t_OFF = 80 ns enable efficient operation with <5% dead-time penalty.
Inverter Output Stage	Motor Control Interface
Use Scenario: Push-pull output stage in 24 V AC inverter feeding resistive heating elements. IC Role / Device Role / Timing Role: Medium-power switching element in totem-pole configuration driving transformer primary. Use Value: I_C = −4 A rating and P_C = 1.2 W allow continuous 50 W load switching with minimal heatsinking.	Use Scenario: Directional control switch for brushed DC motor (24 V, 2 A) in HVAC actuator. IC Role / Device Role / Timing Role: Low-side current sink enabling bidirectional PWM control via H-bridge topology. Use Value: h_FE linearity ensures consistent torque response across 0–100% duty cycle without gain-induced nonlinearity.

Relay Driver Circuit

DC-DC Converter Switch

Use Scenario: Driving 24 V, 100 mA coil relays in industrial PLC output modules.

IC Role / Device Role / Timing Role: NPN switch controlling relay coil current path with TTL-level base input.

Use Value: V_CE(sat) ≤ −200 mV ensures <20 mW coil-side loss and eliminates need for snubber diodes in most cases.

Use Scenario: High-side switch in 12 V → 5 V buck converter operating at 200 kHz.

IC Role / Device Role / Timing Role: Main power switch handling peak I_C = −3.5 A pulses with 50% duty cycle.

Use Value: f_T = 130 MHz and t_OFF = 80 ns enable efficient operation with <5% dead-time penalty.

Inverter Output Stage

Motor Control Interface

Use Scenario: Push-pull output stage in 24 V AC inverter feeding resistive heating elements.

IC Role / Device Role / Timing Role: Medium-power switching element in totem-pole configuration driving transformer primary.

Use Value: I_C = −4 A rating and P_C = 1.2 W allow continuous 50 W load switching with minimal heatsinking.

Use Scenario: Directional control switch for brushed DC motor (24 V, 2 A) in HVAC actuator.

IC Role / Device Role / Timing Role: Low-side current sink enabling bidirectional PWM control via H-bridge topology.

Use Value: h_FE linearity ensures consistent torque response across 0–100% duty cycle without gain-induced nonlinearity.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SD1898	V_CEO = −120 V, I_C = −3 A, f_T = 100 MHz - higher voltage rating but lower current and bandwidth.	Better suited for 100 V bus applications where peak voltage overshoot exceeds −100 V, but less optimal for high-frequency, high-current loads.	Select 2SD1898 when system transient voltage exceeds −100 V; otherwise 2SD1725T offers superior f_T and I_C.
MJD127	V_CEO = −100 V, I_C = −8 A, P_C = 1.5 W - higher current and power, but f_T = 3 MHz limits switching speed.	Preferred for linear or low-frequency (<10 kHz) high-current switching where gain stability matters more than speed.	Choose MJD127 for robustness in overload-prone motor drives; use 2SD1725T where fast PWM response is mandatory.

Compared with 2SD1898 and MJD127, the 2SD1725T uniquely balances −100 V rating, −4 A current, 130 MHz f_T, and tight h_FE binning - making it optimal for medium-power, medium-frequency switching where both efficiency and controllability are critical.

Availability

2SD1725T is available at Aetrix Electronics and suitable for relay drivers, DC-DC converters, and motor control interfaces requiring stable component supply and long-term industrial availability.

Supply support for 2SD1725T 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 known for high-reliability discrete devices and analog ICs before its acquisition by Panasonic in 2012.

The 2SD1725T belongs to SANYO's general-purpose epitaxial planar NPN transistor family, engineered specifically for industrial switching applications demanding predictable gain, low saturation voltage, and repeatable thermal behavior.

FAQ

What is the maximum continuous collector current rating for the 2SD1725T?

The 2SD1725T has a maximum continuous collector current (I_C) rating of −4 A at ambient temperature T_A = 25 °C with no heatsink. Derating applies above 25 °C per the PC–T_A curve in the datasheet; at T_A = 75 °C, usable I_C drops to approximately −2.5 A. This rating assumes proper PCB copper area and airflow - actual current capability depends on thermal design.

Does the 2SD1725T have a built-in base-emitter resistor?

No, the 2SD1725T is a standard three-terminal NPN bipolar transistor without any integrated base-emitter resistors. It requires external base drive circuitry - typically a series resistor between controller output and base (Pin 3) - to set appropriate I_B and ensure saturation under load. This discrete architecture gives designers full control over switching speed and gain staging.

What is the guaranteed h_FE range for the 2SD1725T at I_C = −0.5 A?

The 2SD1725T is binned for h_FE = 140–280 when measured at V_CE = −5 V and I_C = −0.5 A. This specification appears in the "h_FE Classification" table on page 2 of the ENN2048B datasheet. The tighter binning compared to generic transistors simplifies base drive design and improves consistency across production batches of the 2SD1725T.

Can the 2SD1725T be used in avalanche mode?

No, the 2SD1725T is not rated or characterized for avalanche operation. Its absolute maximum V_CEO = −100 V is specified under open-base conditions only, and SANYO explicitly warns against exceeding rated values even momentarily. For circuits subject to inductive kickback, external clamping (e.g., flyback diode or TVS) is mandatory - the 2SD1725T itself provides no controlled avalanche energy absorption.

What is the thermal resistance junction-to-ambient (R_θJA) for the 2SD1725T in TO-126LP package?

The datasheet does not specify a single R_θJA value for the 2SD1725T because it depends entirely on PCB layout. Instead, SANYO provides derating curves: PC = 1.2 W at T_A = 25 °C, decreasing linearly to zero at T_A = 150 °C. With 1-inch² 2-oz copper pad, typical R_θJA is ~100 °C/W; with minimal copper, it may exceed 200 °C/W. Always validate thermal performance using the PC–T_A plot in the 2SD1725T datasheet.

2SD1725T 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):: 4 A

Voltage - Collector Emitter Breakdown (Max):: 100 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 200mA, 2A

Current - Collector Cutoff (Max):: 1µA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 200 @ 500mA, 5V

Power - Max:: 1.2 W

Frequency - Transition:: 180MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-126LP

2SD1725T FAQ

1.How can I place an order for 2SD1725T through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1725T 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 2SD1725T reliable?

The price and inventory of 2SD1725T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1725T is usually 5 days.

3.What payment methods are accepted for 2SD1725T?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1725T transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1725T?

2SD1725T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1725T 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 2SD1725T?

For technical support, including 2SD1725T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1725T requirements.

6.How does Aetrix verify that 2SD1725T is sourced from the original manufacturer or authorized distributors?

All 2SD1725T 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 2SD1725T meets industry standards.

7.What is the process for return or replacement of 2SD1725T?

All 2SD1725T units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1725T, 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 2SD1725T part is unused and in its original packaging.

Return procedure for 2SD1725T:

1.Submit a request within 90 days.

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

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