BCP51E6327HTSA1 Equivalent & Substitute Parts

Part Overview

The BCP51E6327HTSA1 is a PNP bipolar junction transistor manufactured by Infineon Technologies, rated for 45 V collector-emitter breakdown voltage and 1 A maximum collector current. This device is packaged in PG-SOT223-4-10 surface mount configuration and is currently classified as obsolete. Due to its obsolete status, equivalent and substitute parts from active manufacturers are necessary for new designs and ongoing production requirements. Substitute parts must maintain electrical compatibility within the specified parameter ranges while meeting current manufacturing and compliance standards.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	45	V
Current - Collector (Ic) (Max)	1	A
Vce Saturation (Max) @ Ib, Ic	500mV @ 50mA, 500mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	40 @ 150mA, 2V	—
Power - Max	2	W
Frequency - Transition	125	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution logic for the BCP51E6327HTSA1 is based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP (mandatory match)
Voltage - Collector Emitter Breakdown: ≥45 V (equal or higher acceptable)
Current - Collector (Ic) (Max): ≥1 A (equal or higher acceptable)
Vce Saturation: ≤500mV @ specified test conditions
Current - Collector Cutoff: ≤100nA
DC Current Gain (hFE): ≥40 @ 150mA, 2V
Power - Max: ≥2 W (equal or higher acceptable)
Frequency - Transition: ≥125 MHz
Mounting Type: Surface Mount (mandatory match)
Package / Case: TO-261-4 or TO-261AA (mandatory match)
Moisture Sensitivity Level: 1 (Unlimited)

Substitute Parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (45 V, 1 A, 2 W)

BCP51TA (Diodes Incorporated): Active product, SOT-223-3 package, identical electrical specifications
FZT591TA (Diodes Incorporated): Active product, 60 V rated (higher voltage margin), 2 W power rating

Category 2: Automotive-Grade Alternatives (45 V, 1 A, 1 W, AEC-Q100)

BCP51,115 (Nexperia USA Inc.): Active product, AEC-Q100 qualified, 145 MHz transition frequency
BCP51-10,135 (Nexperia USA Inc.): Active product, AEC-Q100 qualified, automotive grade
BCP51-16,115 (Nexperia USA Inc.): Active product, AEC-Q100 qualified, hFE 100 @ 150mA
BCP51-16,135 (Nexperia USA Inc.): Active product, AEC-Q100 qualified, hFE 100 @ 150mA

Category 3: Higher Voltage Alternatives (60 V, 1 A)

BCP52-16,115 (Nexperia USA Inc.): Active product, 60 V rated, AEC-Q100 qualified
BCP52TA (Diodes Incorporated): Active product, 60 V rated, 2 W power rating
BSP31,115 (NXP USA Inc.): Active product, 60 V rated, 1.3 W power rating

Category 4: Higher Current Alternative (40 V, 3 A)

FZT1151ATA (Diodes Incorporated): Active product, 40 V rated, 3 A collector current, 2.5 W power rating

Parameter Comparison

Part Number	Manufacturer	Product Status	Vce(BR) (V)	Ic (A)	Vce Sat (mV)	hFE @ 150mA, 2V	Power (W)	fT (MHz)	Package	RoHS	AEC-Q100
BCP51E6327HTSA1	Infineon	Obsolete	45	1	500	40	2	125	PG-SOT223-4-10	—	—
BCP51TA	Diodes Inc.	Active	45	1	500	40	2	125	SOT-223-3	ROHS3	—
BCP51,115	Nexperia	Active	45	1	500	63	1	145	SOT-223	ROHS3	Yes
BCP51-10,135	Nexperia	Active	45	1	500	63	1	145	SOT-223	ROHS3	Yes
BCP51-16,115	Nexperia	Active	45	1	500	100	1	145	SOT-223	ROHS3	Yes
BCP51-16,135	Nexperia	Active	45	1	500	100	1	145	SOT-223	ROHS3	Yes
BCP52-16,115	Nexperia	Active	60	1	500	100	1	145	SOT-223	ROHS3	Yes
BCP52TA	Diodes Inc.	Active	60	1	500	40	2	125	SOT-223-3	ROHS3	—
BSP31,115	NXP USA	Active	60	1	500	100	1.3	100	SOT-223	—	—
FZT591TA	Diodes Inc.	Active	60	1	600	100	2	150	SOT-223-3	ROHS3	—
FZT1151ATA	Diodes Inc.	Active	40	3	300	250	2.5	145	SOT-223-3	ROHS3	—

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

BCP51TA from Diodes Incorporated is the primary direct substitute. It maintains all critical electrical parameters of the BCP51E6327HTSA1 (45 V, 1 A, 2 W, 125 MHz) while offering active product status and ROHS3 compliance. The SOT-223-3 package is mechanically compatible with TO-261-4 footprints. This part is recommended for applications requiring no design modification.

For Automotive Applications:

BCP51,115, BCP51-10,135, BCP51-16,115, and BCP51-16,135 from Nexperia USA Inc. are all AEC-Q100 qualified alternatives. These parts meet automotive-grade requirements and offer improved DC current gain (63–100 @ 150mA, 2V) and higher transition frequency (145 MHz). Power rating is reduced to 1 W, which is acceptable for most applications operating within the 1 A collector current specification. These parts are recommended for automotive and mission-critical applications.

For Higher Voltage Margin Applications:

BCP52-16,115 and BCP52TA provide 60 V collector-emitter breakdown voltage, offering additional voltage margin over the 45 V specification. BCP52-16,115 includes AEC-Q100 qualification. BCP52TA maintains the 2 W power rating. These parts are recommended when circuit design includes voltage transients or when higher voltage headroom is required.

For Higher Current Capability:

FZT1151ATA from Diodes Incorporated supports 3 A collector current at 40 V breakdown voltage. This part is suitable for applications requiring higher current handling while maintaining compatible package and saturation characteristics. The 40 V rating is lower than the original 45 V specification and must be evaluated against circuit voltage requirements.

Compliance Considerations:

All recommended substitutes are ROHS3 compliant. Nexperia parts include AEC-Q100 automotive qualification. All parts maintain MSL 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected for all substitutes.

Frequently Asked Questions (FAQ)

Q1: Can BCP51TA directly replace BCP51E6327HTSA1 without circuit modification?

A: Yes. BCP51TA maintains identical electrical specifications (45 V, 1 A, 2 W, 125 MHz, hFE 40 @ 150mA, 2V, Vce Sat 500mV). The SOT-223-3 package is mechanically compatible with TO-261-4 footprints. No circuit modification is required.

Q2: What is the difference between BCP51 and BCP52 series?

A: The primary difference is collector-emitter breakdown voltage. BCP51 series is rated for 45 V maximum, while BCP52 series is rated for 60 V maximum. All other electrical parameters (1 A collector current, saturation voltage, current gain) remain equivalent. BCP52 provides higher voltage margin for applications with voltage transients.

Q3: Why do Nexperia BCP51 variants show 1 W power rating instead of 2 W?

A: Nexperia BCP51,115, BCP51-10,135, BCP51-16,115, and BCP51-16,135 are rated for 1 W maximum power dissipation, compared to 2 W for the original BCP51E6327HTSA1 and Diodes BCP51TA. This difference reflects thermal design specifications. For applications operating within 1 A collector current and typical saturation voltages, 1 W rating is sufficient. Verify thermal requirements for your specific application.

Q4: What does AEC-Q100 qualification mean?

A: AEC-Q100 is an automotive electronics qualification standard. Parts bearing this qualification have undergone stress testing and reliability validation for automotive applications. Nexperia BCP51 and BCP52 variants include AEC-Q100 qualification, making them suitable for automotive and mission-critical designs.

Q5: Can FZT1151ATA be used as a substitute?

A: FZT1151ATA is functionally compatible but with design considerations. It supports 3 A collector current (higher than 1 A requirement) but is rated for 40 V breakdown voltage (lower than 45 V specification). Use this part only if circuit voltage remains below 40 V and higher current capability is beneficial. Verify voltage margins in your application.

Q6: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts are ROHS3 compliant. The original BCP51E6327HTSA1 does not specify RoHS status due to its obsolete classification.

Q7: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape and Tape & Reel are distribution formats, not device specifications. Both formats contain identical components. Tape & Reel is used for high-volume automated assembly; Cut Tape is used for lower-volume or manual assembly. Electrical and mechanical specifications are identical.

Q8: Can I use FZT591TA as a direct replacement?

A: FZT591TA is electrically compatible with higher voltage margin (60 V vs. 45 V) and improved transition frequency (150 MHz vs. 125 MHz). However, Vce saturation is specified at 600mV @ 100mA, 1A (compared to 500mV @ 50mA, 500mA for the original). Verify saturation voltage requirements in your circuit before substitution.

Q9: What is the significance of hFE (DC Current Gain) variations among substitutes?

A: hFE variations (40 to 250 @ 150mA, 2V) indicate different current gain characteristics. Higher hFE requires less base current to achieve the same collector current. For switching applications, higher hFE improves switching efficiency. For linear amplification, verify that circuit biasing accommodates the specified hFE range. All listed substitutes maintain minimum hFE ≥40, meeting the original specification.

Q10: Is the PG-SOT223-4-10 package identical to SOT-223-3?

A: PG-SOT223-4-10 and SOT-223-3 are both surface mount packages with compatible footprints and pin configurations. The primary difference is pin count designation in manufacturer nomenclature. Both are mechanically and electrically compatible for PCB layout purposes.

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