onsemi 2SD1683T

Overview

2SD1683T from onsemi is an NPN bipolar junction transistor in TO-126ML package, rated for 50 V V_CEO, 4 A I_C, and 1.5 W P_C at T_c = 25°C, with low V_CE(sat) of 190–500 mV at I_C = 2 A / I_B = 100 mA. It serves as a high-current switching device in relay drivers and lamp drivers.

For engineers reviewing the 2SD1683T datasheet, pinout, applications, or equivalent options, key selection criteria include its 150 MHz f_T, wide ASO, low saturation voltage, h_FE rank T (200–400 at I_C = 100 mA), and TO-126ML thermal performance under pulsed and DC operation.

Technical Context

The 2SD1683T uses FBET and MBIT processes to achieve low V_CE(sat) and high current capability. Its h_FE is specified across two test conditions: 200–400 at V_CE = 2 V / I_C = 100 mA (rank T), and ≥40 at V_CE = 2 V / I_C = 3 A - confirming stable gain under high-current switching.

Switching performance is characterized with t_on = 70 ns, t_stg = 650 ns, and t_f = 35 ns under defined test circuit conditions (V_CC = 25 V, R_L = 25 Ω, I_C/I_B = 20). Cob = 25 pF at V_CB = –10 V enables predictable high-frequency turn-off behavior.

Key Specifications

Pinout & Package

Package: TO-126ML (JEDEC TO-126 compatible), surface-mountable with tab-connected collector, thermally enhanced for PCB copper area mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MJD127G and 2SC4110, the 2SD1683T offers optimal balance of 50 V rating, 150 MHz f_T, and TO-126ML through-hole compatibility - making it ideal for cost-sensitive, medium-voltage industrial controls where thermal management via PCB copper is preferred over SMT heatsinking.

Availability

2SD1683T is available at Aetrix Electronics and suitable for relay drivers, lamp drivers, and voltage regulators requiring stable component supply, consistent h_FE binning, and proven TO-126ML thermal performance in industrial environments.

Supply support for 2SD1683T 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 2SD1683T belongs to onsemi's general-purpose bipolar transistor product line, designed specifically for high-reliability, medium-power discrete switching in industrial control and power management systems.

FAQ

What is the h_FE range for 2SD1683T and how is it binned?

The 2SD1683T is ranked as "T", meaning its DC current gain h_FE is guaranteed between 200 and 400 when measured at V_CE = 2 V and I_C = 100 mA. This binning ensures consistent base drive requirements across production lots. The 2SD1683T maintains h_FE ≥40 even at I_C = 3 A, supporting reliable saturation under high-current load conditions.

Is 2SD1683T pin-compatible with 2SB1143T?

No - the 2SD1683T is an NPN transistor while the 2SB1143T is its complementary PNP counterpart. Both share identical TO-126ML packaging and pinout (Emitter–Collector–Base), but polarity reversal means they cannot be substituted without circuit redesign. The 2SD1683T pinout is E–C–B; using it in place of 2SB1143T would invert switching logic and risk damage.

What is the maximum pulsed collector current rating for 2SD1683T?

The 2SD1683T supports a pulsed collector current I_CP of 6 A, specified under short-duration conditions (e.g., 100 ms duty cycle). This rating enables handling of inductive kickback and cold-filament inrush currents beyond its 4 A DC limit. Thermal design must account for pulse energy dissipation to avoid junction temperature exceedance.

Does 2SD1683T meet lead-free (RoHS) requirements?

Yes - the 2SD1683T is manufactured as a Pb-free (RoHS-compliant) device, confirmed by onsemi's ordering information indicating "Pb Free" for the "S" variant and standard compliance for the "T" variant. The device uses matte tin plating and meets JEDEC J-STD-020 moisture sensitivity level (MSL) requirements for standard PCB assembly.

How does the TO-126ML package differ from standard TO-126?

The TO-126ML is a modified TO-126 outline with tighter dimensional tolerances and optimized thermal pad geometry, retaining JEDEC TO-126 mechanical compatibility while improving thermal resistance to PCB copper. Its 0.97 g mass and 15.5 mm × 11.0 mm footprint allow direct substitution in legacy TO-126 layouts, and the metal tab remains collector-connected for heatsinking - critical for stable operation of the 2SD1683T under sustained 2–3 A loads.