onsemi 2SA1709T-AN

Overview

2SA1709T-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 −0.13 V (typ) at I_C = −1 A / I_B = −100 mA and supports fast switching with t_on = 80 ns, t_f = 40 ns, used in high-voltage DC-DC converter output stages.

For engineers reviewing the 2SA1709T-AN datasheet, pinout, applications, or equivalent options, key selection criteria include verified PNP polarity, −100 V breakdown rating, h_FE rank T (200–400), SC-71 mechanical compatibility, and low-saturation performance under pulsed −3 A loads.

Technical Context

This device belongs to the 2SA1709/2SC4489 complementary pair family fabricated using FBET and MBIT processes. Its PNP structure provides symmetric high-voltage switching capability alongside the NPN 2SC4489T-AN, enabling push-pull and H-bridge topologies requiring matched V_(BR)CEO, f_T ≈ 120 MHz, and Cob ≈ 16 pF.

Designed for discrete power control, it operates with guaranteed V_(BR)CBO = −120 V and thermal limits up to T_j = 150 °C. The SC-71 package supports automated placement and offers 0.275 g mass with JEITA/JEDEC-standardized footprint and terminal layout.

Key Specifications

Pinout & Package

Package: SC-71 (JEITA/IEC standard), also designated NMP(Taping) by onsemi; surface-mount, 3-terminal, plastic-molded case with 0.275 g mass and standardized tape-and-reel packaging (2,500 pcs./bag).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Compared with 2SA1709S-AN, the 2SA1709T-AN offers tighter h_FE control for precision base-drive design; versus MJD2955G, it trades current/power capability for compact SC-71 integration and faster switching-ideal for space-constrained, medium-voltage SMPS.

Availability

2SA1709T-AN is available at Aetrix Electronics and suitable for industrial motor drives, telecom power supplies, and LED lighting systems requiring stable component supply with traceable Pb-free compliance and 2,500 pcs./bag taping format.

Supply support for 2SA1709T-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 2SA1709/2SC4489 family was designed specifically for complementary high-voltage switching in compact power conversion and motor control circuits where SC-71 footprint and matched PNP/NPN characteristics are essential.

FAQ

What is the h_FE range guaranteed for 2SA1709T-AN?

The 2SA1709T-AN is binned to h_FE Rank T, guaranteeing a DC current gain of 200 to 400 when measured at V_CE = −5 V and I_C = −100 mA. This tighter range than the S-rank variant enables more predictable base resistor selection and improved current regulation stability in production designs using the 2SA1709T-AN.

Is 2SA1709T-AN RoHS and Pb-free compliant?

Yes, the 2SA1709T-AN is Pb-free and RoHS-compliant, as confirmed in the official onsemi ordering information which specifies "Pb Free" for this part number. The device meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for SC-71 packages and is qualified for lead-free reflow soldering per J-STD-020 standards.

What is the maximum pulsed collector current rating for 2SA1709T-AN?

The 2SA1709T-AN has a rated collector current pulse (I_CP) of −3 A, specified under non-repetitive conditions with appropriate duty cycle and thermal management. This rating allows short-duration overload handling-such as motor startup surges or capacitor charging spikes-without device failure, provided average power remains within the 1 W continuous dissipation limit.

Can 2SA1709T-AN be used in place of 2SA1709S-AN without circuit modification?

No, direct substitution of 2SA1709T-AN for 2SA1709S-AN is not recommended without verifying base drive design. Although both share identical absolute ratings and package, the 2SA1709T-AN's higher h_FE range (200–400 vs. 140–280) may cause excessive collector current or thermal stress if the original base resistor was sized for the lower-gain S-rank version of the 2SA1709T-AN.

What is the thermal resistance junction-to-ambient (R_θJA) for 2SA1709T-AN in standard FR-4 PCB layout?

onsemi does not publish a specific R_θJA value for the 2SA1709T-AN in the available datasheet. However, based on SC-71 package thermal performance benchmarks and typical 1-inch² 2-oz copper pad layouts, R_θJA is estimated between 250–300 °C/W. For reliable operation, thermal design must ensure junction temperature stays ≤150 °C using calculated power dissipation and ambient conditions-always validate with actual board-level thermal testing for the 2SA1709T-AN.