FJA4313 bipolar transistor — Specifications & Equivalents

About the FJA4313

The FJA4313 is an NPN bipolar transistor with a collector–emitter voltage (V_CEO) rating of 250 V, a continuous collector current (I_C) of 17 A and a DC current gain (h_FE) of minimum 55. It can dissipate up to 130 W. It is supplied in the TO3PN package.

At a glance

• Type: NPN bipolar transistor
• Max collector–emitter voltage (V_CEO): 250 V
• Max collector current (I_C): 17 A
• DC current gain (h_FE): minimum 55
• Power dissipation (P_D): 130 W
• Package: TO3PN

Typical applications

Judging from its ratings the FJA4313 is generally applied in power output and driver stages.

The quoted current gain of minimum 55 determines the base drive needed: divide your target collector current by the minimum h_FE, not the typical figure, when sizing the base resistor.

Biasing and absolute maximum ratings

Absolute-maximum breakdown limits are V_CEO 250 V, V_CBO 250 V and V_EBO 5 V (magnitudes). The emitter–base rating is the easiest to overlook and is often only a few volts, so protect the junction against reverse drive.

Dissipation is capped at 130 W, and that figure assumes the datasheet's mounting and ambient conditions — derate it for your own thermal design.

Choosing a replacement for the FJA4313

A drop-in substitute for the FJA4313 must be the same NPN type and offer a collector–emitter rating of at least 250 V, a collector current rating of at least 17 A and current gain in the same ballpark as minimum 55.

Mechanically, check the replacement against the TO3PN footprint and confirm the pin order — parts sharing a package outline do not always share a pinout.

Where the application switches inductive loads or runs near the voltage limit, keep extra headroom rather than choosing a part that only just meets the original numbers.

Frequently asked questions

What is the FJA4313?

The FJA4313 is an NPN bipolar junction transistor (BJT). It is rated for 250 V collector-emitter and 17 A continuous collector current.

What is the maximum voltage of the FJA4313?

Maximum collector-emitter voltage (Vceo) is 250 V, and collector-base (Vcbo) is 250 V.

How much current can the FJA4313 handle?

Continuous collector current is rated at 17 A, with dissipation limited to 130 W.

What is the hFE of the FJA4313?

DC current gain (hFE) is quoted as minimum 55. Size base drive from the minimum value so the transistor saturates fully across production spread.

What package does the FJA4313 come in?

It is listed in TO3PN. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the FJA4313?

This page lists 17 candidate equivalents matched on electrical ratings and package. Any replacement should meet or exceed the original voltage, current and dissipation figures and use a compatible drive level.