BCX51-16,135 Equivalent & Substitute Parts

Part Overview

The BCX51-16,135 is a PNP bipolar junction transistor manufactured by Nexperia USA Inc., rated for 45 V collector-emitter breakdown voltage and 1 A maximum collector current. The device is packaged in SOT-89 surface mount configuration and qualified to AEC-Q100 automotive standards. This part is currently active in production with 1530 units in stock.

Substitute parts are necessary when the primary part becomes unavailable, when alternative packaging formats are required, or when design flexibility permits selection from qualified alternatives meeting the same electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	1	A
Collector-Emitter Breakdown Voltage (Max)	45	V
Vce Saturation (Max)	500	mV @ 50mA, 500mA
Collector Cutoff Current (Max)	100	nA
DC Current Gain (hFE Min)	100	@ 150mA, 2V
Power Dissipation (Max)	1.3	W
Transition Frequency	145	MHz
Operating Temperature (Max)	150	°C
Package Type	SOT-89 (TO-243AA)	—
Mounting Type	Surface Mount	—
Grade	Automotive	—
Qualification	AEC-Q100	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the BCX51-16,135 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector current rating must be ≥ 1 A
Collector-emitter breakdown voltage must be ≥ 45 V
Vce saturation must be ≤ 500 mV at specified bias conditions
DC current gain (hFE) must support circuit bias requirements
Power dissipation must be ≥ 1.3 W

Mechanical Compatibility Requirements:

Package must be SOT-89 (TO-243AA) surface mount
Mounting type must be surface mount
Pin configuration must be compatible with SOT-89 footprint

Compliance Requirements:

RoHS3 compliance required
Automotive grade preferred for AEC-Q100 qualified applications
MSL rating of 1 (Unlimited) acceptable

Substitute parts are grouped into three categories based on their relationship to the main part:

Parametric Equivalent: Identical electrical specifications and packaging format, differing only in distribution packaging (Tape & Reel vs. Cut Tape).

Direct Manufacturer Equivalent: Functionally equivalent from different manufacturer with minor parameter variations within acceptable tolerances.

Similar Alternative: Parts meeting core electrical requirements but with variations in secondary parameters such as power rating, transition frequency, or DC current gain.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)	hFE (Min)	Power (Max)	Freq (MHz)	Package	Status
BCX51-16,135	Nexperia USA Inc.	1 A	45 V	100	1.3 W	145	SOT-89	Active
BCX51-16,115	Nexperia USA Inc.	1 A	45 V	100	1.3 W	145	SOT-89	Active
BCX5116TA	Diodes Incorporated	1 A	45 V	100	1 W	150	SOT-89-3	Active
BCX5110TA	Diodes Incorporated	1 A	45 V	63	1 W	150	SOT-89-3	Active
BCX5116H6327XTSA1	Infineon Technologies	1 A	45 V	100	2 W	125	PG-SOT89	Discontinued
BCX51H6327XTSA1	Infineon Technologies	1 A	45 V	40	2 W	125	PG-SOT89	Obsolete
BCX51TA	Diodes Incorporated	1 A	45 V	40	1 W	150	SOT-89-3	Active
BCX52TA	Diodes Incorporated	1 A	60 V	40	1 W	150	SOT-89-3	Active
DXT3906-13	Diodes Incorporated	0.2 A	40 V	100	1 W	250	SOT-89-3	Active
FCX1151ATA	Diodes Incorporated	3 A	40 V	250	2 W	145	SOT-89-3	Active
FCX591ATA	Diodes Incorporated	1 A	40 V	300	1 W	150	SOT-89-3	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

BCX51-16,115 is the optimal substitute for BCX51-16,135. Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications. The only difference is packaging format: BCX51-16,135 is supplied in Tape & Reel format, while BCX51-16,115 is supplied in Cut Tape with Digi-Reel. Both are AEC-Q100 qualified and active in production. This substitute requires no circuit redesign.

Secondary Substitutes (Functionally Equivalent with Minor Variations):

BCX5116TA (Diodes Incorporated) meets all core electrical requirements with 1 A collector current and 45 V breakdown voltage. The power rating is reduced to 1 W compared to 1.3 W in the main part, and transition frequency is increased to 150 MHz. This part is active and AEC-Q100 qualified. Selection is appropriate when the 1 W power rating is sufficient for the application.

BCX51TA (Diodes Incorporated) provides 1 A at 45 V with reduced DC current gain (40 vs. 100). This part is suitable for applications where lower current gain is acceptable. It is active in production with extended operating temperature range (-65°C to 150°C).

Conditional Substitutes (Application-Dependent):

BCX52TA (Diodes Incorporated) offers higher collector-emitter breakdown voltage (60 V vs. 45 V), making it suitable for circuits requiring higher voltage margin. Collector current and power dissipation remain at 1 A and 1 W respectively. This part is active with high inventory availability.

FCX591ATA (Diodes Incorporated) provides 1 A at 40 V with significantly higher DC current gain (300 vs. 100). This part is suitable for low-bias-current applications but operates at reduced breakdown voltage. It is active in production.

Not Recommended:

DXT3906-13 has maximum collector current of only 200 mA, insufficient for 1 A applications.

FCX1151ATA has maximum collector-emitter breakdown voltage of 40 V, below the 45 V requirement.

BCX5116H6327XTSA1 and BCX51H6327XTSA1 (Infineon Technologies) are discontinued or obsolete and should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can BCX51-16,115 be used as a direct replacement for BCX51-16,135?

A: Yes. Both parts are manufactured by Nexperia USA Inc. with identical electrical specifications (1 A, 45 V, 1.3 W, 145 MHz, hFE 100). The difference is packaging format only: BCX51-16,135 is Tape & Reel while BCX51-16,115 is Cut Tape with Digi-Reel. No circuit modification is required.

Q: What is the minimum DC current gain acceptable for substitution?

A: The BCX51-16,135 specifies hFE (Min) of 100 at 150 mA, 2V. Substitutes with lower hFE values (such as BCX51TA at 40 or BCX52TA at 40) are acceptable only if the circuit design does not depend on this specific gain value. Review bias network calculations to confirm compatibility.

Q: Can BCX52TA replace BCX51-16,135 in all applications?

A: BCX52TA is suitable for applications where the higher 60 V breakdown voltage is beneficial or neutral. However, it has reduced DC current gain (40 vs. 100) and lower power rating (1 W vs. 1.3 W). Verify that circuit bias requirements and power dissipation calculations remain valid before substitution.

Q: Are there differences between SOT-89 and SOT-89-3 packages?

A: Both designations refer to the same physical package (TO-243AA) with three leads. SOT-89-3 is the more recent standardized designation. Parts specified as SOT-89 or SOT-89-3 are mechanically and electrically compatible on the same PCB footprint.

Q: Why is FCX591ATA listed as a substitute if it has only 40 V breakdown voltage?

A: FCX591ATA is listed as a similar alternative, not a direct substitute. It meets the 1 A collector current requirement and provides higher DC current gain (300 vs. 100), which may be advantageous in some bias configurations. However, the 40 V breakdown voltage is below the 45 V specification. Use only if circuit design confirms that maximum collector-emitter voltage will not exceed 40 V.

Q: What is the significance of AEC-Q100 qualification?

A: AEC-Q100 qualification indicates the part meets automotive industry reliability and quality standards. BCX51-16,135 and BCX51-16,115 are both AEC-Q100 qualified. BCX5116TA is also AEC-Q100 qualified. For automotive applications, select only from AEC-Q100 qualified alternatives.

Q: Can DXT3906-13 be used in place of BCX51-16,135?

A: No. DXT3906-13 has maximum collector current of 200 mA, which is insufficient for applications requiring 1 A. This part is not suitable for direct substitution.

Q: What inventory considerations apply to these substitutes?

A: BCX51-16,135 has 1530 units in stock. BCX51-16,115 has significantly higher availability at 16512 units. BCX52TA has the highest inventory at 33087 units. For supply chain continuity, BCX52TA and BCX5110TA offer the most robust availability.

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