BSS63 Equivalent & Substitute Parts

Part Overview

The BSS63 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 100V collector-emitter breakdown voltage and 0.2A maximum collector current in a SOT-23 surface mount package. The device is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and production continuity. Substitute parts must maintain electrical compatibility within the specified parameter ranges while offering active product status and continued availability.

Key Parameters

Parameter	BSS63 (Main Part)
Manufacturer	onsemi
Product Status	Obsolete
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	100 V
Current - Collector (Ic) (Max)	0.2 A
Package / Case	SOT-23
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)
RoHS Status	Not specified

Substitute Part Grouping Explanation

Substitution of the BSS63 is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

Transistor Type: PNP (required match)
Voltage - Collector Emitter Breakdown (Max): 100V minimum (equal or greater)
Current - Collector (Ic) (Max): Equal to or greater than 0.2A
Package / Case: SOT-23-3 / TO-236-3 (mechanical compatibility)
Mounting Type: Surface Mount (required match)

Compliance Criteria:

Moisture Sensitivity Level: MSL 1 (Unlimited)
REACH Status: REACH Unaffected
RoHS Status: ROHS3 Compliant

Substitute parts are grouped into two categories based on current rating:

Category 1 - Direct Current Rating Match (0.1A): Parts with reduced current capacity suitable for applications not requiring the full 0.2A specification.

Category 2 - Enhanced Current Rating (1A): Parts with increased current capacity providing design margin and performance enhancement for applications tolerating higher power dissipation.

Parameter Comparison

Parameter	BSS63	BSS63LT1G	BSS63,215	FMMT593TA	FMMT593TC	FMMT723TA	PBSS9110T,215
Manufacturer	onsemi	onsemi	Nexperia USA Inc.	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Nexperia USA Inc.
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V	100 V	100 V	100 V	100 V
Current - Collector (Ic) (Max)	0.2 A	0.1 A	0.1 A	1 A	1 A	1 A	1 A
Power - Max	Not specified	225 mW	250 mW	500 mW	500 mW	625 mW	480 mW
Frequency - Transition	Not specified	95 MHz	85 MHz	50 MHz	50 MHz	200 MHz	100 MHz
Package / Case	SOT-23	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Operating Temperature	Not specified	-55°C ~ 150°C (TJ)	150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	150°C (TJ)
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

For Direct Replacement (Reduced Current Applications):

BSS63LT1G (onsemi) and BSS63,215 (Nexperia USA Inc.) are active products maintaining the onsemi base product number lineage and Nexperia automotive qualification respectively. Both devices are rated for 100V and 0.1A, suitable for applications where collector current does not exceed 100mA. BSS63LT1G offers extended temperature range (-55°C to 150°C) compared to BSS63,215 (150°C maximum). Both parts are ROHS3 compliant with MSL 1 rating.

For Enhanced Performance (Higher Current Applications):

FMMT593TA, FMMT593TC, FMMT723TA, and PBSS9110T,215 are rated for 1A collector current, providing 5x current capacity over the original BSS63. These parts accommodate applications requiring higher current handling or provide design margin for existing circuits. FMMT723TA offers the highest transition frequency at 200MHz. PBSS9110T,215 provides intermediate frequency performance at 100MHz with automotive qualification. All four parts are ROHS3 compliant with MSL 1 rating and REACH unaffected status.

Packaging Considerations:

All substitute parts are available in SOT-23-3 / TO-236-3 surface mount packages, maintaining mechanical compatibility with BSS63 PCB layouts. Packaging variants include Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) options across manufacturers.

Frequently Asked Questions (FAQ)

Q: Can BSS63LT1G directly replace BSS63 in all applications?

A: BSS63LT1G is electrically compatible for applications where collector current does not exceed 100mA. The original BSS63 specification allows up to 200mA; therefore, circuits operating at or near 200mA require evaluation of actual current demand before substitution.

Q: What is the primary difference between FMMT593TA and FMMT593TC?

A: Both parts are identical electrically and mechanically. The difference is packaging format: FMMT593TA is supplied in Cut Tape (CT) & Digi-Reel® format, while FMMT593TC is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements.

Q: Why does FMMT723TA have higher power dissipation (625mW) than FMMT593TA (500mW)?

A: FMMT723TA is specified with higher transition frequency (200MHz versus 50MHz) and higher DC current gain, resulting in increased power rating. The higher frequency capability and gain characteristics support higher-speed switching applications.

Q: Are all substitute parts suitable for automotive applications?

A: BSS63,215 and PBSS9110T,215 carry AEC-Q101 automotive qualification. FMMT593TA, FMMT593TC, and FMMT723TA do not specify automotive qualification. Application requirements determine whether automotive-qualified parts are necessary.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life without moisture bake-out requirements prior to soldering. All substitute parts and the original BSS63 share this classification, eliminating moisture sensitivity as a substitution constraint.

Q: Can PBSS9110T,215 be used in place of FMMT593TC?

A: Both parts are rated for 100V and 1A with SOT-23-3 packaging. PBSS9110T,215 offers higher transition frequency (100MHz versus 50MHz) and higher DC current gain (150 @ 500mA, 5V versus 100 @ 500mA, 5V). Substitution is electrically valid; however, circuit performance characteristics may differ due to frequency and gain variations.

Q: What packaging format should be selected for high-volume production?

A: Tape & Reel (TR) packaging is standard for automated assembly processes. Cut Tape (CT) & Digi-Reel® format is suitable for lower-volume or manual assembly operations. All substitute parts are available in both formats from respective manufacturers.

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