13003 bipolar transistor — Specifications & Equivalents

About the 13003

The 13003 is an NPN bipolar transistor with a collector–emitter voltage (V_CEO) rating of 400 V, a continuous collector current (I_C) of 1.25 A and a DC current gain (h_FE) of minimum 10. It can dissipate up to 20 W and is rated to a junction temperature of 150 °C. It is supplied in the TO126 package.

At a glance

• Type: NPN bipolar transistor
• Max collector–emitter voltage (V_CEO): 400 V
• Max collector current (I_C): 1.25 A
• DC current gain (h_FE): minimum 10
• Transition frequency (f_T): 8 MHz
• Power dissipation (P_D): 20 W
• Max junction temperature (T_J): 150 °C
• Package: TO126

Typical applications

Judging from its ratings the 13003 is generally applied in power output and driver stages and high-voltage switching such as offline converters and lamp drivers.

A transition frequency (f_T) of 8 MHz indicates the frequency range over which useful current gain remains available.

The quoted current gain of minimum 10 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 400 V, V_CBO 600 V and V_EBO 9 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 20 W, and that figure assumes the datasheet's mounting and ambient conditions — derate it for your own thermal design.

Choosing a replacement for the 13003

A drop-in substitute for the 13003 must be the same NPN type and offer a collector–emitter rating of at least 400 V, a collector current rating of at least 1.25 A, current gain in the same ballpark as minimum 10 and a transition frequency of at least 8 MHz for the same bandwidth.

Mechanically, check the replacement against the TO126 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 13003?

The 13003 is an NPN bipolar junction transistor (BJT). It is rated for 400 V collector-emitter and 1.25 A continuous collector current.

What is the maximum voltage of the 13003?

Maximum collector-emitter voltage (Vceo) is 400 V, and collector-base (Vcbo) is 600 V.

How much current can the 13003 handle?

Continuous collector current is rated at 1.25 A, with dissipation limited to 20 W.

What is the hFE of the 13003?

DC current gain (hFE) is quoted as minimum 10. Size base drive from the minimum value so the transistor saturates fully across production spread.

What package does the 13003 come in?

It is listed in TO126. Verify the pinout of the specific variant, as one outline can carry different pin assignments.

What can I use to replace the 13003?

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.