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

onsemi 2SA1706S-AN

Name: 2SA1706S-AN
Brand: onsemi
SKU: 2SA1706S-AN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1706S-AN

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SC-71

Datasheet:: 2SA1706S-AN.pdf

Description:: TRANS PNP 50V 2A 3-NMP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA1706S-AN from onsemi is a PNP bipolar junction transistor rated for –50 V V_CEO, –2 A I_C, and 1 W P_C, featuring low V_CE(sat) (–0.3 V typ at –1 A/–50 mA), fast switching (t_on = 60 ns, t_f = 30 ns), and optimized for relay and lamp driver circuits in industrial control systems.

For engineers reviewing the 2SA1706S-AN datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) performance at high current, ASO robustness under inductive loads, h_FE rank S (140–280 at –100 mA), and SC-71 (NMP) package compatibility with automated assembly.

Technical Context

This PNP transistor uses FBET and MBIT processes to achieve wide active safe operating area (ASO) and stable gain across temperature. Its –50 V V_CEO and –60 V V_CBO support medium-voltage switching, while f_T = 150 MHz enables reliable operation in pulse-driven loads up to several hundred kHz.

The device operates with fixed-base drive logic (e.g., microcontroller GPIO + base resistor), delivering controlled saturation at I_C/I_B = 20. Verified thermal limits include T_j = 150 °C max and T_stg = –55 to +150 °C, supporting deployment in non-derated industrial ambient conditions.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–50 V - supports switching of 24–48 V DC loads without breakdown
I_C	–2 A continuous - handles relay coils and incandescent lamps up to ~100 W at 24 V
V_CE(sat)	–0.3 V (typ) at –1 A/–50 mA - minimizes conduction loss and self-heating in linear/switching modes
h_FE (Rank S)	140–280 at –2 V/–100 mA - ensures predictable base drive sizing for digital control interfaces
t_f	30 ns - enables clean turn-off in PWM-driven inductive loads with reduced voltage spikes
f_T	150 MHz - confirms sufficient bandwidth for fast transient response in feedback-controlled regulators
P_C	1 W at T_a = 25 °C - requires heatsinking or derating above 50 °C ambient for sustained 2 A operation

Pinout & Package

Package: SC-71 (JEITA/JEDEC), also designated NMP(Taping) - surface-mount, 3-pin, gull-wing leadframe, 2.54 mm pitch, 0.275 g mass.

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current sink node; connected to load return or ground rail in high-side switch configuration
2	Collector	Current source node; tied to positive supply rail when used as low-side switch (inverted topology)
3	Base	Control input; requires series resistor to limit I_B and ensure saturation at target I_C

Key Features

Feature	Design Value
Low V_CE(sat)	–0.3 V typical at –1 A/–50 mA - reduces power dissipation by >40% vs. standard PNP transistors at same current
Wide ASO	Validated up to I_C = –2 A and V_CE = –50 V in single-pulse test - withstands inductive kickback in relay drivers
Fast switching	t_on = 60 ns, t_f = 30 ns - enables PWM frequencies >100 kHz with minimal overlap loss
Rank-S h_FE	140–280 at –100 mA - simplifies base resistor selection for consistent saturation across production lots

Applications

Voltage Regulator Control	Relay Driver
Use Scenario: Linear pass transistor in adjustable negative-output LDO or shunt regulator circuits. IC Role / Device Role / Timing Role: PNP pass element regulating output voltage via emitter-follower configuration with feedback loop. Use Value: Low V_CE(sat) maintains regulation accuracy under load; wide ASO prevents secondary breakdown during line transients.	Use Scenario: Driving 24 VDC electromagnetic relays with coil resistance 100–500 Ω in PLC I/O modules. IC Role / Device Role / Timing Role: High-current saturated switch controlling relay coil current path. Use Value: Fast t_f suppresses back-EMF-induced contact arcing; –2 A rating supports dual-coil or latching relay variants.
Lamp Driver	Industrial Signal Interface
Use Scenario: Switching 12–24 V incandescent or halogen indicator lamps in HMI panels and control cabinets. IC Role / Device Role / Timing Role: Constant-current switch managing inrush-limited lamp turn-on and steady-state conduction. Use Value: Robust ASO accommodates cold-filament surge (up to 10× steady-state current); Pb-free NMP package meets RoHS compliance.	Use Scenario: Level-shifting and isolation interface between 3.3 V microcontrollers and –24 V field-side signaling buses. IC Role / Device Role / Timing Role: Inverting level translator enabling bidirectional signal conditioning in safety-critical diagnostics. Use Value: Verified h_FE consistency ensures deterministic switching thresholds; SC-71 footprint allows dense layout in space-constrained DIN-rail modules.

Voltage Regulator Control

Relay Driver

Use Scenario: Linear pass transistor in adjustable negative-output LDO or shunt regulator circuits.

IC Role / Device Role / Timing Role: PNP pass element regulating output voltage via emitter-follower configuration with feedback loop.

Use Value: Low V_CE(sat) maintains regulation accuracy under load; wide ASO prevents secondary breakdown during line transients.

Use Scenario: Driving 24 VDC electromagnetic relays with coil resistance 100–500 Ω in PLC I/O modules.

IC Role / Device Role / Timing Role: High-current saturated switch controlling relay coil current path.

Use Value: Fast t_f suppresses back-EMF-induced contact arcing; –2 A rating supports dual-coil or latching relay variants.

Lamp Driver

Industrial Signal Interface

Use Scenario: Switching 12–24 V incandescent or halogen indicator lamps in HMI panels and control cabinets.

IC Role / Device Role / Timing Role: Constant-current switch managing inrush-limited lamp turn-on and steady-state conduction.

Use Value: Robust ASO accommodates cold-filament surge (up to 10× steady-state current); Pb-free NMP package meets RoHS compliance.

Use Scenario: Level-shifting and isolation interface between 3.3 V microcontrollers and –24 V field-side signaling buses.

IC Role / Device Role / Timing Role: Inverting level translator enabling bidirectional signal conditioning in safety-critical diagnostics.

Use Value: Verified h_FE consistency ensures deterministic switching thresholds; SC-71 footprint allows dense layout in space-constrained DIN-rail modules.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
2SA1037AK-TL-E	V_CEO = –50 V, I_C = –150 mA, h_FE = 120–270 - lower current rating, smaller ASO	Suitable only for signal-level or low-power switching; not rated for 2 A loads	Select 2SA1037AK-TL-E only when board space or cost constraints outweigh current capacity needs.
MMDT3906-7-F	Dual PNP in SOT-363; V_CEO = –40 V, I_C = –200 mA per device - lower voltage margin and current capability	Used in compact dual-channel logic inverters or matched pair biasing; lacks single-device 2 A capability	Choose MMDT3906-7-F for space-constrained dual-signal paths where 2SA1706S-AN's single high-current channel is unnecessary.

Compared with 2SA1037AK-TL-E and MMDT3906-7-F, the 2SA1706S-AN uniquely delivers –2 A continuous current in a single SC-71 device with validated ASO and low V_CE(sat), making it irreplaceable for high-power discrete switching where thermal and voltage margins are critical.

Availability

2SA1706S-AN is available at Aetrix Electronics and suitable for voltage regulators, relay drivers, and lamp drivers requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for 2SA1706S-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 focused on energy-efficient electronics, with leadership in automotive, industrial, cloud, and IoT solutions.

The 2SA1706S-AN belongs to onsemi's general-purpose bipolar transistor product line, engineered specifically for robust, high-current switching in industrial control, power management, and electromechanical actuation applications.

FAQ

What is the maximum continuous collector current rating for the 2SA1706S-AN?

The 2SA1706S-AN is rated for –2 A continuous collector current (I_C) at T_a = 25 °C. Derating is required above 50 °C ambient; the device supports up to –2 A only with adequate PCB copper area or heatsinking. Pulse current reaches –4 A (I_CP) for ≤1 ms, validated per the datasheet's single-pulse ASO curve.

Does the 2SA1706S-AN have a Pb-free package?

Yes, the 2SA1706S-AN uses a Pb-free NMP (SC-71) taping package, compliant with RoHS Directive 2011/65/EU. The marking "2SA1706S-AN" on the device body and shipping documentation explicitly indicates Pb-free construction, confirmed in the onsemi ordering information table.

What is the h_FE range for the 2SA1706S-AN, and how is it binned?

The 2SA1706S-AN is binned to Rank S, with DC current gain (h_FE) specified as 140–280 at V_CE = –2 V and I_C = –100 mA. This binning is laser-marked on the device body as "S", distinguishing it from the 2SA1706T-AN (Rank T: 200–400). Both ranks share identical absolute maximum ratings and package.

Can the 2SA1706S-AN replace the 2SA1706T-AN in existing designs?

The 2SA1706S-AN and 2SA1706T-AN share identical package, pinout, and absolute maximum ratings, but differ in h_FE binning (S: 140–280 vs. T: 200–400). Substitution is acceptable if the circuit has sufficient base drive margin; however, designs relying on minimum h_FE ≥ 200 should verify saturation at worst-case V_BE(sat) and temperature.

What is the recommended base resistor value for switching a 24 V relay coil drawing 100 mA using the 2SA1706S-AN?

For reliable saturation with I_C = –100 mA, use I_B ≥ I_C/20 = –5 mA. With V_BE(sat) ≈ –1.0 V (typ) and 3.3 V GPIO drive, R_B = (3.3 V – 1.0 V)/5 mA = 460 Ω - a standard 470 Ω resistor ensures margin. Confirm with actual V_BE(sat) and temperature data from the 2SA1706S-AN datasheet curves.

2SA1706S-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):: 2 A

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

Vce Saturation (Max) @ Ib, Ic:: 700mV @ 50mA, 1A

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

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

Power - Max:: 1 W

Frequency - Transition:: 150MHz

Operating Temperature:: 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 3-NMP

2SA1706S-AN FAQ

1.How can I place an order for 2SA1706S-AN through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1706S-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 2SA1706S-AN reliable?

The price and inventory of 2SA1706S-AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1706S-AN is usually 5 days.

3.What payment methods are accepted for 2SA1706S-AN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1706S-AN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1706S-AN?

2SA1706S-AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1706S-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 2SA1706S-AN?

For technical support, including 2SA1706S-AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1706S-AN requirements.

6.How does Aetrix verify that 2SA1706S-AN is sourced from the original manufacturer or authorized distributors?

All 2SA1706S-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 2SA1706S-AN meets industry standards.

7.What is the process for return or replacement of 2SA1706S-AN?

All 2SA1706S-AN units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1706S-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 2SA1706S-AN part is unused and in its original packaging.

Return procedure for 2SA1706S-AN:

1.Submit a request within 90 days.

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

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