BC636 Equivalent & Substitute Parts

Part Overview

The BC636 is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. The device operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 45 V and delivers 1 W of power dissipation. The BC636 features a transition frequency of 100 MHz and is housed in a TO-92-3 through-hole package.

The BC636 is classified as an obsolete product. Locating equivalent substitute parts is necessary to support ongoing maintenance, repair, and production requirements for legacy equipment and systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100nA (ICBO)	—
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	—
Power - Max	1	W
Frequency - Transition	100	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitute parts for the BC636 are identified based on electrical and mechanical parameter equivalence. The following criteria determine substitution eligibility:

Electrical Parameters:

Transistor type must be PNP
Maximum collector current (Ic) must be 1 A or greater
Collector-emitter breakdown voltage must be 45 V or greater
Vce saturation characteristics must match: 500mV @ 50mA, 500mA
DC current gain (hFE) minimum must be 40 @ 150mA, 2V
Maximum power dissipation must be 1 W or greater
Transition frequency must be 100 MHz or greater
Maximum operating junction temperature must be 150°C or greater

Mechanical Parameters:

Mounting type must be through-hole
Package must be TO-92-3 or equivalent TO-226-3 configuration

Parts meeting all electrical and mechanical criteria are classified as direct substitutes and may be used interchangeably in circuit applications designed for the BC636.

Parameter Comparison

Parameter	BC636	BC636TA	Match
Transistor Type	PNP	PNP	✓
Current - Collector (Ic) (Max)	1 A	1 A	✓
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	✓
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	500mV @ 50mA, 500mA	✓
Current - Collector Cutoff (Max)	100nA (ICBO)	100nA (ICBO)	✓
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	40 @ 150mA, 2V	✓
Power - Max	1 W	1 W	✓
Frequency - Transition	100 MHz	100 MHz	✓
Operating Temperature (TJ)	150°C	150°C	✓
Mounting Type	Through Hole	Through Hole	✓
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	✓

Engineering Selection Recommendations

BC636TA is a direct electrical and mechanical equivalent to the BC636. All specified electrical parameters, including collector current, breakdown voltage, saturation characteristics, current gain, power rating, transition frequency, and operating temperature, are identical. Both devices utilize the same TO-92-3 through-hole package configuration.

The BC636TA is classified as Last Time Buy, indicating limited availability. The BC636TA is RoHS3 compliant and REACH unaffected. Selection between BC636 and BC636TA should be based on application requirements, supply chain availability, and compliance mandates specific to the end-use system.

Frequently Asked Questions (FAQ)

Q: Can BC636TA be used as a direct replacement for BC636?

A: Yes. The BC636TA meets all electrical and mechanical specifications of the BC636. Both devices are PNP transistors with identical maximum ratings for collector current (1 A), breakdown voltage (45 V), power dissipation (1 W), transition frequency (100 MHz), and operating temperature (150°C). Both are packaged in TO-92-3 through-hole configuration.

Q: What is the difference between BC636 and BC636TA?

A: The primary differences are packaging format and product status. BC636 is supplied in standard packaging and is classified as obsolete. BC636TA is supplied in cut tape (CT) format and is classified as Last Time Buy. Electrically and mechanically, both devices are equivalent.

Q: Are there any compliance differences between BC636 and BC636TA?

A: BC636TA is RoHS3 compliant, while BC636 compliance status is not specified in the provided data. Both devices are REACH unaffected and carry the same ECCN (EAR99) and HTSUS (8541.29.0075) classifications.

Q: Can I use BC636TA in a circuit designed for BC636?

A: Yes. The BC636TA is electrically and mechanically equivalent to the BC636. No circuit modifications are required. The device will function identically in switching and amplification applications.

Q: What is the significance of the TO-92-3 package?

A: The TO-92-3 package is a three-lead through-hole configuration with formed leads. This package type is compatible with standard PCB through-hole mounting processes and breadboard prototyping. Both BC636 and BC636TA utilize this package standard.

Q: Why is BC636 classified as obsolete?

A: Product obsolescence indicates that the manufacturer has discontinued production and support for the BC636. Substitute parts such as BC636TA remain available to support legacy equipment and systems.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message