BC635-16,126 Equivalent & Substitute Parts

Part Overview

The BC635-16,126 is an NPN bipolar junction transistor manufactured by NXP USA Inc., designed for general-purpose switching and amplification applications. This device features a maximum collector current of 1 A, collector-emitter breakdown voltage of 45 V, and maximum power dissipation of 830 mW in a through-hole TO-92-3 package. The BC635-16,126 is classified as obsolete, necessitating identification of functionally equivalent substitute components for new designs and production continuity. Equivalent parts maintain identical electrical specifications while offering alternative packaging formats and active product status from current manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	1	A
Voltage - Collector Emitter Breakdown (Max)	45	V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 50 mA, 500 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150 mA, 2 V	—
Power - Max	830	mW
Frequency - Transition	180	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the BC635-16,126 are qualified based on matching the following critical electrical parameters: NPN transistor type, 1 A maximum collector current, 45 V collector-emitter breakdown voltage, 500 mV saturation voltage at specified bias conditions, 100 nA maximum collector cutoff current, 100 minimum DC current gain at 150 mA and 2 V, and 180 MHz transition frequency. All substitute parts maintain identical electrical performance specifications and operating temperature range of 150°C maximum junction temperature.

Substitutes are differentiated by mounting technology and package format. The BC635-16,126 uses through-hole TO-92-3 packaging. Equivalent parts are available in surface-mount configurations including SOT-223 (BCP54 series) and SOT-89 (BCX54 series) packages. These alternatives provide enhanced power dissipation capabilities (960 mW for SOT-223 and 1.25 W for SOT-89) compared to the original 830 mW rating, ensuring thermal margin in equivalent or upgraded applications. All substitute parts are manufactured by Nexperia USA Inc. and maintain active product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Parameter Comparison

Parameter	BC635-16,126	BCP54-16,115	BCP54-16,135	BCX54-16,115	BCX54-16,135
Manufacturer	NXP USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	NPN	NPN	NPN	NPN	NPN
Current - Collector (Ic) Max	1 A	1 A	1 A	1 A	1 A
Voltage - Collector Emitter Breakdown (Max)	45 V	45 V	45 V	45 V	45 V
Vce Saturation (Max) @ Ib, Ic	500 mV @ 50 mA, 500 mA	500 mV @ 50 mA, 500 mA	500 mV @ 50 mA, 500 mA	500 mV @ 50 mA, 500 mA	500 mV @ 50 mA, 500 mA
Current - Collector Cutoff (Max)	100 nA	100 nA	100 nA	100 nA	100 nA
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150 mA, 2 V	100 @ 150 mA, 2 V	100 @ 150 mA, 2 V	100 @ 150 mA, 2 V	100 @ 150 mA, 2 V
Power - Max	830 mW	960 mW	960 mW	1.25 W	1.25 W
Frequency - Transition	180 MHz	180 MHz	180 MHz	180 MHz	180 MHz
Operating Temperature (TJ)	150°C	150°C	150°C	150°C	150°C
Mounting Type	Through Hole	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-92-3	SOT-223	SOT-223	SOT-89	SOT-89
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

All four substitute parts (BCP54-16,115, BCP54-16,135, BCX54-16,115, and BCX54-16,135) provide direct electrical equivalence to the BC635-16,126 across all specified performance parameters. Selection between substitutes depends on application requirements and circuit board design constraints.

For through-hole applications requiring direct footprint compatibility: The BC635-16,126 is obsolete with limited inventory (1046 pcs). No through-hole substitute maintains identical TO-92-3 packaging; however, through-hole to surface-mount adapter boards or manual rework may be employed if through-hole mounting is mandatory.

For surface-mount designs with standard thermal requirements: The BCP54-16,115 and BCP54-16,135 provide SOT-223 packaging with 960 mW power dissipation. Both parts are active products with full availability. BCP54-16,115 is supplied in Cut Tape and Digi-Reel format (33,330 pcs in stock), while BCP54-16,135 is supplied in Tape & Reel format (1,178 pcs in stock). Selection between these variants depends on procurement and assembly requirements.

For surface-mount designs with enhanced thermal performance: The BCX54-16,115 and BCX54-16,135 provide SOT-89 packaging with 1.25 W power dissipation, offering 50% greater thermal capacity than the original BC635-16,126. BCX54-16,115 is supplied in Cut Tape and Digi-Reel format (5,200 pcs in stock), while BCX54-16,135 is supplied in Tape & Reel format (6,553 pcs in stock). These parts are recommended for applications with elevated ambient temperatures or continuous high-current operation.

All substitute parts maintain RoHS3 compliance, unlimited moisture sensitivity rating (MSL 1), and identical electrical performance specifications. Product status is active for all substitutes, ensuring long-term availability and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the BC635-16,126 be directly replaced with BCP54-16,115 or BCP54-16,135?

A: Electrical substitution is direct. All electrical parameters are identical. However, package format differs: BC635-16,126 uses through-hole TO-92-3, while BCP54 series uses surface-mount SOT-223. Circuit board redesign or adapter solutions are required for physical integration.

Q: What is the difference between BCP54-16,115 and BCP54-16,135?

A: Both parts are electrically and functionally identical. The difference is packaging format: BCP54-16,115 is supplied in Cut Tape and Digi-Reel format, while BCP54-16,135 is supplied in Tape & Reel format. Selection depends on assembly equipment compatibility and procurement preferences.

Q: Why do BCX54 parts have higher power ratings (1.25 W) than the original BC635-16,126 (830 mW)?

A: BCX54 series uses SOT-89 packaging, which provides superior thermal characteristics compared to TO-92-3 packaging. The higher power rating reflects improved heat dissipation capability of the package, not increased electrical performance. All electrical specifications remain identical.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. BC635-16,126, BCP54-16,115, BCP54-16,135, BCX54-16,115, and BCX54-16,135 are all RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1).

Q: Which substitute part should be selected for new designs?

A: For new surface-mount designs, BCX54-16,115 or BCX54-16,135 are recommended due to active product status, enhanced thermal performance, and superior long-term availability. For existing through-hole designs, BCP54 or BCX54 series with adapter solutions provide electrical equivalence.

Q: Is the BC635-16,126 still available for purchase?

A: BC635-16,126 is classified as obsolete. Current inventory is limited to 1,046 pcs. For production continuity, migration to active substitute parts is recommended.

Q: Can BCX54 parts be used in applications originally designed for BC635-16,126?

A: Yes. BCX54-16,115 and BCX54-16,135 provide complete electrical equivalence with identical performance specifications. The enhanced power dissipation of SOT-89 packaging ensures compatibility with or exceeds original design requirements.

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