onsemi 2SA1709S-AN

Overview

2SA1709S-AN from onsemi is a PNP bipolar junction transistor rated for −100 V V_CEO, −2 A continuous collector current, and 1 W power dissipation in an SC-71 (NMP) surface-mount package. It delivers low V_CE(sat) of −0.22 V at −1 A/−100 mA drive and supports fast switching with 80 ns turn-on time, used in high-voltage DC-DC converter output stages and industrial relay drivers.

For engineers reviewing the 2SA1709S-AN datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, −100 V breakdown rating, SC-71 package thermal performance, h_FE rank S (140–280), and Pb-free taping compliance per ordering code AN.

Technical Context

This device belongs to the 2SA1709/2SC4489 complementary pair family fabricated using FBET and MBIT processes. It operates as a medium-power PNP switch with guaranteed V_(BR)CEO = −100 V and V_(BR)CBO = −120 V, supporting stable DC biasing up to T_j = 150 °C.

Its electrical behavior is characterized by h_FE = 140–280 at −5 V V_CE, f_T = 120 MHz at −10 V V_CE/−100 mA I_C, and Cob = 16 pF at −10 V V_CB, enabling use in high-speed linear and switching amplifiers where gain-bandwidth and capacitance trade-offs are critical.

Key Specifications

Pinout & Package

2SA1709S-AN uses the SC-71 (JEITA/IEC designation) package, also labeled NMP(Taping) by onsemi, with 3-pin surface-mount configuration and 0.275 g mass. Dimensions: 2.54 mm × 1.45 mm × 0.9 mm (L×W×H), 0.6 mm lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 2SA1709T-AN, the 2SA1709S-AN provides broader h_FE tolerance for robustness across temperature and aging, while MJD2955G trades miniaturization and speed for raw current capacity and thermal mass-making 2SA1709S-AN optimal for space-constrained, medium-speed, high-voltage switching.

Availability

2SA1709S-AN is available at Aetrix Electronics and suitable for industrial relay drivers, high-voltage DC-DC converters, linear voltage regulators, and motor control H-bridge upper arms requiring stable component supply and Pb-free compliance.

Supply support for 2SA1709S-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 for automotive, industrial, cloud, and IoT applications.

The 2SA1709 series belongs to onsemi's general-purpose bipolar transistor product line, engineered for reliable high-voltage switching and linear amplification in cost-sensitive industrial controls and power management circuits.

FAQ

What is the maximum operating junction temperature for the 2SA1709S-AN?

The 2SA1709S-AN has a maximum junction temperature (T_j) rating of 150 °C, verified per onsemi's Absolute Maximum Ratings table. This allows continuous operation in ambient temperatures up to 105 °C when mounted on 1-inch² 2-oz copper with 1 thermal via, assuming 1 W dissipation and typical PCB thermal resistance. Derating is required above 25 °C ambient per the PC–Ta curve in the datasheet.

Is the 2SA1709S-AN pin-compatible with the 2SA1709T-AN?

Yes, the 2SA1709S-AN and 2SA1709T-AN share identical SC-71 (NMP) package dimensions, pinout (Emitter–Collector–Base), and absolute maximum ratings. The only difference is h_FE binning: S-rank (140–280) vs. T-rank (200–400). Both are fully interchangeable at the board level, requiring no layout changes.

What does the "AN" suffix indicate in 2SA1709S-AN?

Per onsemi's ordering information, the "AN" suffix in 2SA1709S-AN denotes Pb-free (RoHS-compliant) taping packaging with 2,500 pieces per bag. It confirms compliance with JEDEC J-STD-020 moisture sensitivity level 1 and eliminates lead-based solder compatibility concerns in modern reflow assembly.

Can the 2SA1709S-AN be used in avalanche mode?

No, the 2SA1709S-AN is not rated or characterized for controlled avalanche operation. Its Absolute Maximum Ratings specify only V_(BR)CEO = −100 V and V_(BR)CBO = −120 V as DC breakdown limits-not repetitive avalanche energy. Using it beyond V_CEO risks permanent degradation; external clamping is required for inductive load protection.

What is the typical Cob value of the 2SA1709S-AN and how does it affect switching performance?

The 2SA1709S-AN has a typical output capacitance (C_ob) of 16 pF at V_CB = −10 V and f = 1 MHz. This low capacitance reduces Miller charging time during turn-off, contributing to its 50 ns fall time. In high-frequency switching, it helps maintain duty-cycle fidelity and limits shoot-through risk in half-bridge configurations when paired with complementary NPN devices like 2SC4489S-AN.