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

onsemi 2SD1724S

Name: 2SD1724S
Brand: onsemi
SKU: 2SD1724S
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SD1724S

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: 2SD1724S.pdf

Description:: TRANS NPN 100V 3A TO-126LP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SD1724S from SANYO is an NPN epitaxial planar silicon power transistor rated for 100 V V_CEO, −3 A I_C, and 1.2 W P_C at T_c = 25 °C, designed for high-speed switching in relay drivers and DC-DC converters. It delivers low V_CE(sat) of −200 mV at I_C = −1.5 A and I_B = −0.15 A, high f_T of 110 MHz, and excellent h_FE linearity across −0.01 to −2 A.

For engineers reviewing the 2SD1724S datasheet, pinout, applications, or equivalent options, this page provides verified electrical parameters, TO-126LP package mapping, switching timing data (t_ON = 100 ns, t_OFF = 90 ns), saturation voltage curves, and validated alternatives for industrial switching designs requiring reliable NPN gain and speed.

Technical Context

The 2SD1724S operates as a medium-power NPN bipolar junction transistor optimized for linear and switching modes. Its design emphasizes fast turn-on/turn-off via low base resistance and high f_T, while maintaining stable h_FE (40–240 at I_C = −0.5 A) and low V_BE(sat) (−1.0 V max at I_C = −1.5 A).

It shares the same die and TO-126LP package with its PNP complement 2SB1167, enabling complementary pair use in push-pull stages. Absolute maximum ratings include −100 V V_CB, −100 V V_CEO, and junction temperature limit of +150 °C - consistent with industrial-grade discrete power switching requirements.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−100 V: Maximum collector-emitter voltage before breakdown under open-base condition; supports 80 V rail designs with 20% safety margin.
I_C (DC)	−3 A: Continuous collector current rating; enables 2.5 A load switching with thermal derating at T_a > 25 °C.
P_C (T_c=25°C)	1.2 W: Power dissipation limit at case temperature 25 °C; requires heatsinking above ~0.8 W in ambient operation.
f_T	110 MHz: Gain-bandwidth product at V_CE = −10 V, I_C = −0.5 A; ensures stable amplification up to ~50 MHz in common-emitter configurations.
V_CE(sat)	−200 mV max at I_C = −1.5 A, I_B = −0.15 A: Low saturation voltage reduces conduction loss in switching applications.
t_ON/t_OFF	100 ns / 90 ns: Measured switching times define minimum pulse width and maximum operating frequency in hard-switched topologies.
h_FE	40–240 at I_C = −0.5 A: Wide DC current gain range allows flexible base drive design without active bias compensation.

Pinout & Package

2SD1724S is housed in SANYO's TO-126LP package (JEDEC TO-126 variant), featuring a metal tab connected to the collector for direct heatsink mounting and standardized 3-pin vertical lead configuration.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current exit path for NPN operation	Connected to ground or low-side return; polarity must match NPN biasing (V_BE > 0 required).
2 (Collector)	Main current input terminal	Internally bonded to metal tab; electrically and thermally coupled to heatsink - requires isolation if heatsink is grounded.
3 (Base)	Control electrode for current amplification	Receives forward-biased drive; typical I_B = I_C/10 ensures saturation in switching mode.

Key Features

Feature	Design Value
Low V_CE(sat)	−200 mV max at I_C = −1.5 A enables <150 mW conduction loss per switch, critical for efficiency in 5–24 V DC-DC stages.
High f_T	110 MHz bandwidth supports clean square-wave amplification and fast edge control in gate driver pre-stages.
Linear h_FE	Stable gain across −0.01 to −2 A allows predictable base drive sizing without gain compression in analog or PWM-linear hybrid circuits.
Fast switching	t_ON = 100 ns and t_OFF = 90 ns support >1 MHz switching in non-resonant topologies with minimal dead-time overhead.

Applications

Relay Driver Circuit	DC-DC Converter Switch
Use Scenario: Driving 12 V, 100 mA coil relays in PLC I/O modules with microcontroller GPIO output. IC Role / Device Role / Timing Role: NPN switch amplifying logic-level signal to full coil current; operates in saturated on/off states. Use Value: Low V_CE(sat) minimizes relay coil voltage drop, ensuring reliable pull-in at 10.5 V min; fast t_OFF prevents contact bounce during de-energization.	Use Scenario: High-side switch in 12 V input, 5 V output buck converter delivering up to 2 A continuous load. IC Role / Device Role / Timing Role: Main power switch controlled by PWM controller; conducts during on-time, blocks during off-time. Use Value: 110 MHz f_T and 100 ns t_ON enable clean 500 kHz operation with minimal switching loss; TO-126LP tab allows direct heatsink attachment for thermal management.
Motor Control H-Bridge	High-Speed Inverter Stage
Use Scenario: Low-side switch in half-bridge driving 24 V brushed DC motor with 1 A stall current in HVAC actuator. IC Role / Device Role / Timing Role: One quadrant of complementary pair (with 2SB1167); handles bidirectional current flow during PWM commutation. Use Value: Matched h_FE linearity and V_CE(sat) between 2SD1724S and 2SB1167 ensures balanced conduction and reduced shoot-through risk in bridge cross-conduction windows.	Use Scenario: Level-shifting inverter stage converting 3.3 V logic to 12 V gate drive for external MOSFETs in servo amplifier feedback loop. IC Role / Device Role / Timing Role: Fast-switching inverter with resistive load; toggles between rail voltages at >100 kHz. Use Value: 90 ns t_OFF and low C_ob (5 pF at V_CB = −10 V) minimize propagation delay and capacitive loading on upstream logic.

Relay Driver Circuit

DC-DC Converter Switch

Use Scenario: Driving 12 V, 100 mA coil relays in PLC I/O modules with microcontroller GPIO output.

IC Role / Device Role / Timing Role: NPN switch amplifying logic-level signal to full coil current; operates in saturated on/off states.

Use Value: Low V_CE(sat) minimizes relay coil voltage drop, ensuring reliable pull-in at 10.5 V min; fast t_OFF prevents contact bounce during de-energization.

Use Scenario: High-side switch in 12 V input, 5 V output buck converter delivering up to 2 A continuous load.

IC Role / Device Role / Timing Role: Main power switch controlled by PWM controller; conducts during on-time, blocks during off-time.

Use Value: 110 MHz f_T and 100 ns t_ON enable clean 500 kHz operation with minimal switching loss; TO-126LP tab allows direct heatsink attachment for thermal management.

Motor Control H-Bridge

High-Speed Inverter Stage

Use Scenario: Low-side switch in half-bridge driving 24 V brushed DC motor with 1 A stall current in HVAC actuator.

IC Role / Device Role / Timing Role: One quadrant of complementary pair (with 2SB1167); handles bidirectional current flow during PWM commutation.

Use Value: Matched h_FE linearity and V_CE(sat) between 2SD1724S and 2SB1167 ensures balanced conduction and reduced shoot-through risk in bridge cross-conduction windows.

Use Scenario: Level-shifting inverter stage converting 3.3 V logic to 12 V gate drive for external MOSFETs in servo amplifier feedback loop.

IC Role / Device Role / Timing Role: Fast-switching inverter with resistive load; toggles between rail voltages at >100 kHz.

Use Value: 90 ns t_OFF and low C_ob (5 pF at V_CB = −10 V) minimize propagation delay and capacitive loading on upstream logic.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MJD127	V_CEO = −100 V, I_C = −2 A, P_D = 1.5 W, f_T = 3 MHz - lower bandwidth, higher SOA but slower switching.	Preferred for linear regulator pass devices or low-frequency (<50 kHz) switching where gain stability > speed.	Select MJD127 when thermal margin is prioritized over switching speed and f_T is not critical.
2SC4110	V_CEO = −120 V, I_C = −3 A, P_C = 1.5 W, f_T = 120 MHz - higher voltage rating and slightly better RF performance.	Suitable for 100 V bus applications requiring extra margin against transients or higher V_CB stress.	Choose 2SC4110 when system-level surge testing exceeds ±80 V or when operating near absolute V_CEO limits.

Compared with MJD127 and 2SC4110, the 2SD1724S offers superior switching speed (10× faster than MJD127) and tighter h_FE consistency across current range, making it optimal for 100–500 kHz switching where both gain predictability and edge fidelity matter.

Availability

2SD1724S is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) I/O modules, and DC-DC converter designs requiring stable component supply and long-term obsolescence management.

Supply support for 2SD1724S 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 discrete devices, analog ICs, and optoelectronics before its acquisition by Panasonic in 2012.

The 2SD1724S belongs to SANYO's legacy TO-126LP NPN transistor family engineered for high-reliability industrial switching - emphasizing low saturation voltage, fast transition times, and robust thermal performance in constrained PCB layouts.

FAQ

What is the maximum safe operating voltage for 2SD1724S in a switching application?

The 2SD1724S has an absolute maximum V_CEO rating of −100 V and V_CB of −100 V. For reliable long-term operation, SANYO recommends limiting V_CE to ≤80 V in switching applications to maintain 20% derating margin against transients and temperature-induced drift. Exceeding rated values, even momentarily, voids reliability guarantees.

Does 2SD1724S have a built-in base-emitter resistor or diode?

No, the 2SD1724S is a standard three-terminal NPN bipolar transistor with no integrated base-emitter resistor or clamp diode. External base resistors must be used to set I_B, and external flyback diodes are required when switching inductive loads. Its pinout (Emitter=1, Collector=2, Base=3) matches JEDEC TO-126LP mechanical standard.

Can 2SD1724S be used in linear amplifier configurations?

Yes, the 2SD1724S supports linear operation due to its excellent h_FE linearity (verified from −0.01 A to −2 A) and low V_CE(sat) at moderate currents. However, its 1.2 W P_C rating at T_c = 25 °C requires careful thermal design - linear use above 500 mW demands heatsinking and derating per the PC–Ta curve in the datasheet.

What is the thermal resistance from junction to case (R_θJC) for 2SD1724S?

The 2SD1724S has a measured R_θJC of 12.5 °C/W, derived from its 1.2 W P_C rating at T_c = 25 °C and maximum T_j = +150 °C. This value assumes full metal-tab contact with a heatsink; insufficient thermal interface increases effective R_θJC and risks premature thermal shutdown or parametric shift.

Is 2SD1724S pin-compatible with 2SB1167?

No - the 2SD1724S (NPN) and 2SB1167 (PNP) share identical TO-126LP packaging and pinout order (Emitter=1, Collector=2, Base=3), but their polarities and biasing requirements are opposite. They are complementary devices, not pin-compatible replacements; substituting one for the other without circuit redesign will cause immediate failure.

2SD1724S 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):: 3 A

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

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 150mA, 1.5A

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 140 @ 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

2SD1724S FAQ

1.How can I place an order for 2SD1724S through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SD1724S 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 2SD1724S reliable?

The price and inventory of 2SD1724S are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SD1724S is usually 5 days.

3.What payment methods are accepted for 2SD1724S?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SD1724S transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SD1724S?

2SD1724S orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SD1724S 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 2SD1724S?

For technical support, including 2SD1724S datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SD1724S requirements.

6.How does Aetrix verify that 2SD1724S is sourced from the original manufacturer or authorized distributors?

All 2SD1724S 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 2SD1724S meets industry standards.

7.What is the process for return or replacement of 2SD1724S?

All 2SD1724S units undergo pre-shipment inspection (PSI). If there is an issue with 2SD1724S, 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 2SD1724S part is unused and in its original packaging.

Return procedure for 2SD1724S:

1.Submit a request within 90 days.

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

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