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

onsemi 2SA1708S-AN

Name: 2SA1708S-AN
Brand: onsemi
SKU: 2SA1708S-AN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1708S-AN

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SC-71

Datasheet:: 2SA1708S-AN.pdf

Description:: TRANS PNP 100V 1A 3-NMP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA1708S-AN from onsemi is a PNP bipolar junction transistor designed for medium-power switching and linear amplification in industrial control, power supply regulation, and motor drive circuits. It delivers V_CEO = –100 V, I_C = –1 A, P_C = 1 W, V_CE(sat) = –0.6 V (max) at I_C = –400 mA, and f_T = 120 MHz - enabling fast, low-loss switching in DC-DC converters and relay drivers.

For engineers reviewing the 2SA1708S-AN datasheet, pinout, applications, or equivalent options, key selection criteria include its SC-71 (NMP) package, h_FE rank S (140–280), low saturation voltage, high breakdown rating, and Pb-free taping configuration suitable for automated SMT assembly.

Technical Context

The 2SA1708S-AN is a discrete PNP BJT fabricated using onsemi's FBET and MBIT processes, optimized for high-voltage switching with robust thermal performance. Its –120 V V_CBO, –100 V V_CEO, and 150 °C T_j rating support operation in demanding industrial environments where voltage transients and ambient temperature extremes occur.

It exhibits fast switching dynamics (t_on = 80 ns, t_stg = 850 ns, t_f = 50 ns) and low output capacitance (C_ob = 8.5 pF at V_CB = –10 V), making it suitable for high-frequency switching applications up to several MHz - particularly where complementary NPN pairing with 2SC4488S-AN is required.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–100 V - supports safe operation in 80 V rail systems with margin against transient overvoltage
I_C	–1 A continuous - enables direct drive of small solenoids, relays, and LED arrays without external buffering
V_CE(sat)	–0.6 V max at I_C = –400 mA - minimizes conduction loss and self-heating in saturated-switching topologies
f_T	120 MHz - allows stable amplification or switching up to ~10–20 MHz with adequate gain margin
h_FE	140–280 (Rank S) - ensures predictable current gain across production lots for consistent bias design
C_ob	8.5 pF at V_CB = –10 V - reduces Miller effect and improves turn-off speed in high-dV/dt circuits
P_C	1 W at T_A = 25 °C - requires minimal heatsinking in PCB-mounted applications with moderate duty cycles

Pinout & Package

Package: SC-71 (JEITA/IEC standard), also designated NMP (Taping) - surface-mount, 3-pin, plastic molded case with 0.275 g mass and 2.54 mm lead pitch. Dimensions: 2.5 × 1.45 × 0.9 mm (L × W × H).

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit node; connects to higher potential in PNP operation; referenced for base bias and current sensing
2	Collector	Current entry node; ties to load or supply rail; primary heat path and voltage stress point
3	Base	Control terminal; requires current-limited drive (e.g., R_B ≥ 1 kΩ) to achieve specified h_FE and switching speed

Key Features

Feature	Design Value
High breakdown voltage	V_CBO = –120 V enables use in 100 V bus systems with >20 % safety margin against surge events
Low V_CE(sat)	–0.6 V max reduces power dissipation by >30 % vs. legacy PNP transistors at same I_C
Fast switching	t_f = 50 ns and t_on = 80 ns support PWM frequencies up to 2 MHz in Class-D or SMPS designs
Rank-coded h_FE	S-rank (140–280) provides tighter gain distribution for production-critical bias networks
Pb-free taping	NMP(Taping) packaging meets RoHS and J-STD-020 reflow requirements for automated SMT lines

Applications

Industrial Power Supply Control	DC Motor Direction Switching
Use Scenario: High-side switch in 24–48 V offline SMPS feedback loop and auxiliary bias winding regulation. IC Role / Device Role / Timing Role: PNP switching transistor controlling optocoupler LED current and secondary-side reference voltage sampling. Use Value: Low V_CE(sat) and high V_CEO ensure stable regulation under line surges while minimizing standby losses.	Use Scenario: H-bridge half-bridge leg in brushed DC motor driver for HVAC actuators and valve positioners. IC Role / Device Role / Timing Role: Complementary PNP switch paired with 2SC4488S-AN to enable bidirectional current flow through motor windings. Use Value: Matched f_T and switching times between 2SA1708S-AN and 2SC4488S-AN reduce shoot-through risk and improve PWM fidelity.
Relay and Solenoid Driver	Linear Voltage Regulator Pass Element
Use Scenario: Driving 12–24 V DC relays and pneumatic solenoids in PLC I/O modules and factory automation controllers. IC Role / Device Role / Timing Role: Saturated-switch PNP transistor providing galvanically isolated coil current path with fast turn-off. Use Value: 850 ns storage time and 50 ns fall time allow rapid de-energization, reducing contact arcing and improving cycle life.	Use Scenario: Series pass element in adjustable linear regulators delivering up to 800 mA at ≤100 V input-to-output differential. IC Role / Device Role / Timing Role: High-voltage PNP pass transistor dissipating regulated output current while maintaining thermal stability. Use Value: 150 °C T_j rating and 1 W power dissipation support continuous operation with modest heatsinking in compact enclosures.

Industrial Power Supply Control

DC Motor Direction Switching

Use Scenario: High-side switch in 24–48 V offline SMPS feedback loop and auxiliary bias winding regulation.

IC Role / Device Role / Timing Role: PNP switching transistor controlling optocoupler LED current and secondary-side reference voltage sampling.

Use Value: Low V_CE(sat) and high V_CEO ensure stable regulation under line surges while minimizing standby losses.

Use Scenario: H-bridge half-bridge leg in brushed DC motor driver for HVAC actuators and valve positioners.

IC Role / Device Role / Timing Role: Complementary PNP switch paired with 2SC4488S-AN to enable bidirectional current flow through motor windings.

Use Value: Matched f_T and switching times between 2SA1708S-AN and 2SC4488S-AN reduce shoot-through risk and improve PWM fidelity.

Relay and Solenoid Driver

Linear Voltage Regulator Pass Element

Use Scenario: Driving 12–24 V DC relays and pneumatic solenoids in PLC I/O modules and factory automation controllers.

IC Role / Device Role / Timing Role: Saturated-switch PNP transistor providing galvanically isolated coil current path with fast turn-off.

Use Value: 850 ns storage time and 50 ns fall time allow rapid de-energization, reducing contact arcing and improving cycle life.

Use Scenario: Series pass element in adjustable linear regulators delivering up to 800 mA at ≤100 V input-to-output differential.

IC Role / Device Role / Timing Role: High-voltage PNP pass transistor dissipating regulated output current while maintaining thermal stability.

Use Value: 150 °C T_j rating and 1 W power dissipation support continuous operation with modest heatsinking in compact enclosures.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP bipolar transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1708T-AN	Same package and absolute ratings, but h_FE rank T (200–400) - higher and wider gain range	Preferred where tighter closed-loop gain stability or higher current drive capability is needed	Select 2SA1708T-AN when circuit requires guaranteed h_FE ≥ 200 at I_C = –100 mA
MJD2955G	TO-252 (DPAK) package, V_CEO = –60 V, I_C = –10 A, P_C = 15 W - higher power, lower voltage, larger footprint	Suitable for higher-current, lower-voltage applications where board space permits larger package	Choose MJD2955G only if system demands >1 A continuous current and can accommodate DPAK thermal and layout constraints

Compared with 2SA1708T-AN, the 2SA1708S-AN offers more conservative h_FE bounds for predictable bias design, while MJD2955G trades voltage headroom and miniaturization for raw current capacity - making 2SA1708S-AN optimal for compact, medium-voltage, precision-gain switching roles.

Availability

2SA1708S-AN is available at Aetrix Electronics and suitable for industrial power supply control, DC motor direction switching, and relay/solenoid driver applications requiring stable component supply, RoHS-compliant taping, and consistent h_FE binning.

Supply support for 2SA1708S-AN 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The 2SA1708S-AN belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliability and consistency in industrial switching and amplification - emphasizing high-voltage tolerance, low saturation loss, and manufacturability in high-volume SMT assembly.

FAQ

What is the maximum collector-emitter voltage rating for the 2SA1708S-AN?

The 2SA1708S-AN has a maximum collector-to-emitter voltage rating (V_CEO) of –100 V at T_A = 25 °C. This rating is confirmed in the Absolute Maximum Ratings table of the official onsemi datasheet No. 3094-2/8. Exceeding this voltage may cause irreversible breakdown. Derating is required above 25 °C ambient per the PC–Ta derating curve in the datasheet.

Is the 2SA1708S-AN RoHS compliant and lead-free?

Yes, the 2SA1708S-AN is RoHS compliant and Pb-free, as explicitly stated in the Ordering Information section of the onsemi datasheet: "2SA1708S-AN - NMP(Taping), 2,500 pcs./box, Pb Free." The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for reflow soldering.

How does the h_FE rank 'S' differ from 'T' in the 2SA1708S-AN versus 2SA1708T-AN?

The 'S' rank in 2SA1708S-AN specifies a DC current gain (h_FE) range of 140–280 at V_CE = –5 V and I_C = –100 mA, whereas the 'T' rank (2SA1708T-AN) guarantees 200–400 under identical conditions. Both share identical absolute ratings and package, but the S-rank offers tighter lower-bound predictability for conservative bias design.

What is the thermal resistance junction-to-ambient (R_θJA) for the 2SA1708S-AN?

The datasheet does not specify R_θJA directly; however, using P_C = 1 W at T_A = 25 °C and T_j(max) = 150 °C, the implied R_θJA is approximately 125 °C/W. Actual value depends on PCB copper area and airflow - typical SC-71 devices achieve 100–140 °C/W on 1-in² 2-oz copper with no forced air.

Can the 2SA1708S-AN be used as a direct replacement for the 2SA1015 in existing designs?

No - the 2SA1015 has V_CEO = –50 V and I_C = –150 mA, while the 2SA1708S-AN is rated for –100 V and –1 A. Although both are PNP transistors in similar packages, the 2SA1708S-AN's higher voltage/current capability introduces different parasitic capacitance, switching behavior, and bias requirements. Redesign validation is required before substitution.

2SA1708S-AN Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

Package/Case:: SC-71

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 1 A

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

Vce Saturation (Max) @ Ib, Ic:: 600mV @ 40mA, 400mA

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 100mA, 5V

Power - Max:: 1 W

Frequency - Transition:: 120MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-NMP

2SA1708S-AN FAQ

1.How can I place an order for 2SA1708S-AN through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1708S-AN 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 2SA1708S-AN reliable?

The price and inventory of 2SA1708S-AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1708S-AN is usually 5 days.

3.What payment methods are accepted for 2SA1708S-AN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1708S-AN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1708S-AN?

2SA1708S-AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1708S-AN 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 2SA1708S-AN?

For technical support, including 2SA1708S-AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1708S-AN requirements.

6.How does Aetrix verify that 2SA1708S-AN is sourced from the original manufacturer or authorized distributors?

All 2SA1708S-AN 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 2SA1708S-AN meets industry standards.

7.What is the process for return or replacement of 2SA1708S-AN?

All 2SA1708S-AN units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1708S-AN, 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 2SA1708S-AN part is unused and in its original packaging.

Return procedure for 2SA1708S-AN:

1.Submit a request within 90 days.

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

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