2N2604 BJT Derating Graph

2N2604 PNP BJT

2N2604 Temperature-Power Derating Curve [2N2605]
PNP Low Power Silicon Transistor. Package, TO-46 metal Can.
Transistor Applications: Designed for high speed switching applications.

2N2604 maximum power dissipation
2N2604 Air Temp. Derating Curve, TO-46 Package

Use the Graph to determine how much to derate power [wattage] based on ambient operational temperature. Note that both the 2N2604 and 2N2605 need to be derated for any temperate above 250C, and have a maximum operational ambient temperature range to 2000C
Derate linearly 2.28 mW/0C above an ambient temperature of 250C.
The derating curve or equation relate to a component in still air, applying forced air will lessen the requirement to derate the device. How ever the best design will use one of the two lower gray curves for 2N2604 operation. Additional Transistor Derating Curves.
Temperature derating is a standard design practice for electrical engineers.

Refer to MIL-PRF-19500/354K Semiconductor Device, Transistor, PNP, Silicon, Low-Power, Types 2N2604, 2N2605, 2N2604UB and 2N2605UB, JAN, JANTX, JANTXV, [TO-46, UB surface mount package]

2N2604 Maximum Ratings:
Collector Emitter Voltage (VCEO) = 60 volts dc [2N2604 / 2N2605]
Collector Base Voltage (VCBO) = 80 volts dc [2N2604]
Collector Base Voltage (VCBO) = 70 volts dc [2N2605]
Emitter Base Voltage (VEBO) = 6 volts dc [2N2604 / 2N2605]
Power Dissipation (PT) at 250C = 400mW
Operating Temperature (TJ) = -65 to +2000C, [Max Junction Temperature; 2000C]
Storage Temperature (Tstg) = -65 to +2000C,

The 2N2605 will have a higher hfe than the 2N2604 at the same Ic.
Consult the data sheet for additional information.

List of Transistor Manufacturers, Clip-on Heat Sink Manufacturers

Using either the 2N2604 Ambient temperature [above] or 2N2604 Case temperature [below], the gray curves are the preferred derating curves [110C or 125C]. The black curve that intersects at 150 degrees C is the line that the electrical tests for maximum temperature are performed. The upper most curve relates to the maximum junction temperature, and should be avoided.

How to derate a 2N2604 Transistor by Case Temperature
2N2604 Case Temperature Derating, TO-46 package

How to Derate; Guideline for Derating Electronic Components
Note that derating curves are not shown for a 2N2604 surface mount package.
The 2N2604 transistor is currently in production.

2N2604-UB SMD BJT Derating

2N2604UB Temperature-Power Derating Curve [2N2605]
PNP Low Power Silicon Transistor. Package, UB [Surface Mount].

Derating the 2N2604-UB and 2N2605-UB are as follows, in text:
The maximum junction temperature lies at 400mW until 90 degrees centigrade, and than falls in a linear manner down to 200C. The center curve which is used to generate the numbers found on data sheets starts at 400mW, but begins to fall at 40 C down to 150C. The two preferred operational curves begin at 300mW and 360mW and fall to 110C and 125C.

Refer to MIL-PRF-19500/354; Semiconductor Device, Transistor, PNP, Silicon, Low-Power, Types 2N2604, 2N2604UB, 2N2605, and 2N2605UB, JAN, [UB surface mount, TO-46]

2N2604-UB Maximum Operational Ratings:
Collector Emitter Voltage = 60 volts dc
Collector Base Voltage = 80 volts dc
Emitter Base Voltage = 6 volts dc
Power Dissipation 250C = 400mW
Operating Temperature = -65 to +2000C

Note that the derating curves are identical between a 2N2604UB and a 2N2605UB package.
For longest life use one of the preferred operational curves [gray curves not shown].

2N2604 Surface Mount terminal identification;
Pad 1 is Base, Pad 2 is Emitter, Pad 3 is Collector, and Pad 4 is Lid.
The lid; Pad 4 should be used for shielding the component.

Editor note; This page is not meant to replace a manufacturers data sheet. This topic covers the components indicated, a package style and a dearting graph which relates to those parts. Electrical characteristics are provided so that the reader gets a basic understanding of the type of transistor this is, but the electrical characteristics should not be used to replace those in the data sheet, although they should be identical. Most transistor data sheets don't bother to provide a derating graph.

TO-46 transistor package out-line
TO-46 Case Transistor

Related; PNP Low Power Transistor, BJT
Derating curves for a 2N2604UB BJT

Manufacturers of Fans

Technical note; Unless otherwise stated
all electrical characteristics are for 250C

2N2604 Surface Mount Package
2N2604 SMD

2N2604 Surface Mount Package Dimensions
2N2604UB Package Dimensions
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Modified 1/21/12
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