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

onsemi 2SA1706T-AN

Name: 2SA1706T-AN
Brand: onsemi
SKU: 2SA1706T-AN
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 2SA1706T-AN

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

Package:: SC-71

Datasheet:: 2SA1706T-AN.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

2SA1706T-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 min at –1 A/–50 mA), fast switching (t_on = 60 ns, t_f = 30 ns), and h_FE range of 200–400 at –100 mA - used in relay drivers, lamp drivers, and voltage regulators.

For engineers reviewing the 2SA1706T-AN datasheet, pinout, applications, or equivalent options, key selection criteria include verified V_CE(sat) performance at high current, SC-71 (NMP) package thermal limits, h_FE rank T classification, and switching time validation under –25 V V_CC test conditions.

Technical Context

This PNP transistor employs FBET and MBIT processes to achieve wide Safe Operating Area (ASO) and large continuous current capacity. Its design supports linear and switching operation with guaranteed V_(BR)CEO = –50 V and V_(BR)CBO = –60 V, enabling robust use in inductive load control circuits.

Electrical behavior is characterized at T_a = 25°C with specified test circuits for switching parameters (t_on, t_stg, t_f) and DC gain (h_FE1/h_FE2). The device exhibits f_T = 150 MHz and C_ob = 22 pF at V_CB = –10 V, confirming suitability for medium-frequency switching applications.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	–50 V - maximum allowable collector-emitter voltage before breakdown in common-emitter configuration
I_C	–2 A - continuous collector current rating defining safe DC conduction capability
V_CE(sat)	–0.3 V to –0.7 V at I_C = –1 A, I_B = –50 mA - low saturation voltage enables efficient power switching with minimal heat generation
h_FE	200–400 at V_CE = –2 V, I_C = –100 mA - high DC current gain supports low-base-drive designs
f_T	150 MHz at V_CE = –10 V, I_C = –50 mA - usable bandwidth for medium-speed digital and analog switching
t_f	30 ns - fast fall time reduces switching losses in pulse-driven loads like relays and lamps
P_C	1 W at T_a = 25°C - thermal dissipation limit requiring heatsinking above ambient derating thresholds

Pinout & Package

Package: SC-71 (JEITA/IEC designation), also labeled NMP (Taping) by onsemi - surface-mount, 3-pin, plastic molded case with 0.275 g mass and standardized tape-and-reel packing (2,500 pcs./box).

Pin/Terminal	Circuit Role	Design Meaning
1	Emitter	Current exit terminal in PNP configuration; connected to most positive rail in typical switch topology
2	Collector	Current entry terminal; tied to load and negative supply in high-side switching applications
3	Base	Control input; requires sufficient reverse bias (V_EB) to ensure full turn-off in saturated switching

Key Features

Feature	Design Value
Low V_CE(sat)	–0.3 V minimum at –1 A ensures <1.5% conduction loss in 5 V relay driver circuits
Wide ASO	Rated for single-pulse I_CP = –4 A and DC I_C = –2 A with defined derating curve up to 75°C ambient
Fast switching	t_on/t_f = 60 ns/30 ns enables >1 MHz PWM operation without significant overlap loss
Rank T h_FE	200–400 gain band guarantees consistent base drive requirements across production lots

Applications

Relay Driver Circuit	Lamp Driver Module
Use Scenario: Driving 12 V, 500 mA electromagnetic relay coil with microcontroller GPIO output. IC Role / Device Role / Timing Role: High-side PNP switch controlling coil current path to ground; operates in saturation and cutoff modes. Use Value: Low V_CE(sat) minimizes coil voltage drop, ensuring reliable relay pull-in at marginal supply voltages.	Use Scenario: Switching incandescent indicator lamps (12 V, 300 mA) in automotive dashboard systems. IC Role / Device Role / Timing Role: Load switch with fast turn-off (t_f = 30 ns) to prevent lamp flicker during rapid state changes. Use Value: Confirmed t_stg = 450 ns allows predictable timing margins in 100 Hz blink sequences without ghost illumination.
Voltage Regulator Pass Element	Industrial Control Interface
Use Scenario: Series pass transistor in discrete –5 V linear regulator supplying analog sensor circuitry. IC Role / Device Role / Timing Role: Linear-mode current amplifier adjusting emitter output to maintain regulated V_OUT. Use Value: h_FE ≥ 200 ensures stable regulation with ≤10 μA base current from error amplifier output.	Use Scenario: Level-shifting interface between 3.3 V logic and –24 V industrial fieldbus signaling. IC Role / Device Role / Timing Role: Inverting level translator with defined V_(BR)EBO = –6 V protecting MCU pins from reverse transients. Use Value: V_(BR)CBO = –60 V provides 2.5× safety margin against common-mode surges in factory floor environments.

Relay Driver Circuit

Lamp Driver Module

Use Scenario: Driving 12 V, 500 mA electromagnetic relay coil with microcontroller GPIO output.

IC Role / Device Role / Timing Role: High-side PNP switch controlling coil current path to ground; operates in saturation and cutoff modes.

Use Value: Low V_CE(sat) minimizes coil voltage drop, ensuring reliable relay pull-in at marginal supply voltages.

Use Scenario: Switching incandescent indicator lamps (12 V, 300 mA) in automotive dashboard systems.

IC Role / Device Role / Timing Role: Load switch with fast turn-off (t_f = 30 ns) to prevent lamp flicker during rapid state changes.

Use Value: Confirmed t_stg = 450 ns allows predictable timing margins in 100 Hz blink sequences without ghost illumination.

Voltage Regulator Pass Element

Industrial Control Interface

Use Scenario: Series pass transistor in discrete –5 V linear regulator supplying analog sensor circuitry.

IC Role / Device Role / Timing Role: Linear-mode current amplifier adjusting emitter output to maintain regulated V_OUT.

Use Value: h_FE ≥ 200 ensures stable regulation with ≤10 μA base current from error amplifier output.

Use Scenario: Level-shifting interface between 3.3 V logic and –24 V industrial fieldbus signaling.

IC Role / Device Role / Timing Role: Inverting level translator with defined V_(BR)EBO = –6 V protecting MCU pins from reverse transients.

Use Value: V_(BR)CBO = –60 V provides 2.5× safety margin against common-mode surges in factory floor environments.

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 and no pulse current spec	Not suitable for >200 mA loads; limited ASO prevents use in relay/lamp drivers	Select only for low-power signal switching where I_C ≤ 150 mA and V_CE(sat) < –0.5 V is acceptable
MMDT3906-7-F	Dual PNP SOT-363 package; V_CEO = –40 V, I_C = –200 mA per device - lower voltage/current ratings and different footprint	Requires PCB redesign; unsuitable for single-device –2 A switching	Consider only when dual-channel integration and space constraints outweigh need for 2SA1706T-AN's current capability

Compared with 2SA1706T-AN, both alternatives offer smaller packages and lower cost but sacrifice absolute current handling, pulse capability, and thermal robustness - making them viable only in low-power signal-level roles, not in the relay, lamp, or regulator applications where 2SA1706T-AN is validated.

Availability

2SA1706T-AN is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and voltage regulators requiring stable component supply across industrial control, automotive instrumentation, and embedded power management programs.

Supply support for 2SA1706T-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 innovation, serving automotive, industrial, cloud, medical, and IoT markets with discrete, analog, and power management solutions.

The 2SA1706T-AN belongs to onsemi's general-purpose bipolar transistor product line, engineered for high-reliability switching and linear applications in harsh ambient environments with extended temperature operation and robust SOA.

FAQ

What is the h_FE range for 2SA1706T-AN and how is it binned?

The 2SA1706T-AN is ranked "T", specifying a DC current gain (h_FE) range of 200 to 400 when measured at V_CE = –2 V and I_C = –100 mA. This binning is laser-marked on the device body as "T" and is distinct from the "S" rank (140–280). The 2SA1706T-AN's higher h_FE band reduces required base drive current in high-gain amplifier or low-power switching configurations.

Does 2SA1706T-AN support pulsed operation, and what is its peak current rating?

Yes, the 2SA1706T-AN supports pulsed operation with a specified Collector Current (Pulse) I_CP = –4 A at duty cycle ≤ 1% and pulse width ≤ 1 ms. This rating is validated under single-pulse conditions per the datasheet's ASO graph (No.3026-4/6), enabling short-duration surge handling in relay coil energization or lamp inrush suppression - beyond its –2 A DC limit.

What is the package type and mounting compatibility of 2SA1706T-AN?

The 2SA1706T-AN uses the SC-71 package (JEITA/IEC designation), also labeled NMP by onsemi - a 3-pin surface-mount plastic package with 2.54 mm lead pitch and standardized tape-and-reel packaging (2,500 pcs./box). It is compatible with standard SMT reflow profiles and fits footprints designed for JEDEC TO-236AB or SC-59 equivalents, though mechanical dimensions must be verified against outline drawing EN3026B.

How does V_CE(sat) of 2SA1706T-AN compare at different operating points?

The 2SA1706T-AN specifies V_CE(sat) = –0.3 V (min) to –0.7 V (max) at I_C = –1 A and I_B = –50 mA. At lower currents (e.g., I_C = –100 mA), V_CE(sat) drops further - typically ≤ –0.2 V - improving efficiency in low-load applications. These values are measured under defined test conditions and remain stable across the –25°C to +75°C ambient range shown in the V_CE(sat) vs. I_C curves (No.3026-3/6).

Is 2SA1706T-AN RoHS compliant and what marking indicates this?

Yes, the 2SA1706T-AN is RoHS compliant and Pb-free, as confirmed by onsemi's ordering information stating "Pb Free" for the 2SA1706T-AN variant. The device marking includes "2SA1706T-AN", "A1706", lot number, and rank "T" - with no lead-containing indicators. Compliance is documented under onsemi's environmental policy and aligns with EU Directive 2011/65/EU.

2SA1706T-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:: 200 @ 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

2SA1706T-AN FAQ

1.How can I place an order for 2SA1706T-AN through Aetrix?

Please submit a Request for Quotation (RFQ) for 2SA1706T-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 2SA1706T-AN reliable?

The price and inventory of 2SA1706T-AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 2SA1706T-AN is usually 5 days.

3.What payment methods are accepted for 2SA1706T-AN?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 2SA1706T-AN transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 2SA1706T-AN?

2SA1706T-AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 2SA1706T-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 2SA1706T-AN?

For technical support, including 2SA1706T-AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 2SA1706T-AN requirements.

6.How does Aetrix verify that 2SA1706T-AN is sourced from the original manufacturer or authorized distributors?

All 2SA1706T-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 2SA1706T-AN meets industry standards.

7.What is the process for return or replacement of 2SA1706T-AN?

All 2SA1706T-AN units undergo pre-shipment inspection (PSI). If there is an issue with 2SA1706T-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 2SA1706T-AN part is unused and in its original packaging.

Return procedure for 2SA1706T-AN:

1.Submit a request within 90 days.

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

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