KSB772OS Equivalent & Substitute Parts

Part Overview

The KSB772OS is a PNP bipolar junction transistor manufactured by onsemi, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 3 A, collector-emitter breakdown voltage of 30 V, and a maximum power dissipation of 1 W in a Through Hole TO-126-3 package.

The KSB772OS is classified as an obsolete product. Identification of equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications where this transistor is specified in existing designs.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	3	A
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	500mV @ 200mA, 2A	—
Current - Collector Cutoff (Max)	1	µA (ICBO)
Power - Max	1	W
Frequency - Transition	80	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-126-3	—

Substitute Part Grouping Explanation

Substitution of the KSB772OS is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor Type: PNP
Current - Collector (Ic) (Max): 3 A
Voltage - Collector Emitter Breakdown (Max): 30 V
Vce Saturation (Max) @ Ib, Ic: 500mV @ 200mA, 2A
Current - Collector Cutoff (Max): 1 µA (ICBO)
Power - Max: 1 W
Frequency - Transition: 80 MHz
Operating Temperature (TJ): 150 °C
Mounting Type: Through Hole
Package / Case: TO-126-3

The KSB772YS manufactured by Fairchild Semiconductor meets all critical electrical and mechanical parameters required for direct substitution. This part maintains identical voltage and current ratings, thermal characteristics, and package configuration, enabling functional equivalence in circuit applications.

Parameter Comparison

Parameter	KSB772OS (onsemi)	KSB772YS (Fairchild Semiconductor)	Match Status
Transistor Type	PNP	PNP	Equivalent
Current - Collector (Ic) (Max)	3 A	3 A	Equivalent
Voltage - Collector Emitter Breakdown (Max)	30 V	30 V	Equivalent
Vce Saturation (Max) @ Ib, Ic	500mV @ 200mA, 2A	500mV @ 200mA, 2A	Equivalent
Current - Collector Cutoff (Max)	1 µA (ICBO)	1 µA (ICBO)	Equivalent
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 1A, 2V	160 @ 1A, 2V	KSB772YS exceeds minimum
Power - Max	1 W	1 W	Equivalent
Frequency - Transition	80 MHz	80 MHz	Equivalent
Operating Temperature (TJ)	150 °C	150 °C	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	TO-126-3	TO-126-3	Equivalent
Product Status	Obsolete	Active	Substitute is active

Engineering Selection Recommendations

The KSB772YS is a direct electrical and mechanical equivalent to the KSB772OS. The substitute part maintains all critical performance specifications and is housed in the identical TO-126-3 Through Hole package, ensuring pin-for-pin compatibility and direct board-level substitution.

The KSB772YS is classified as an active product with current manufacturing status, providing supply chain continuity and long-term availability compared to the obsolete KSB772OS. The DC current gain (hFE) of the KSB772YS exceeds the minimum specification of the original part, indicating enhanced performance characteristics within the same electrical envelope.

Both parts carry identical ECCN classification (EAR99), confirming equivalent export control status. Selection of the KSB772YS eliminates obsolescence risk while maintaining full functional compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the KSB772YS be used as a direct replacement for the KSB772OS in existing designs?

A: Yes. The KSB772YS meets all electrical and mechanical specifications of the KSB772OS, including collector current, breakdown voltage, saturation characteristics, power dissipation, and transition frequency. The identical TO-126-3 package ensures pin-for-pin compatibility without circuit modification.

Q: What is the primary advantage of substituting the KSB772YS for the KSB772OS?

A: The KSB772YS is an active product with current manufacturing status, whereas the KSB772OS is obsolete. This substitution eliminates supply chain discontinuity and ensures long-term component availability for production and maintenance applications.

Q: Are there any performance differences between these parts?

A: The KSB772YS exhibits a higher minimum DC current gain (hFE) of 160 @ 1A, 2V compared to the KSB772OS specification of 100 @ 1A, 2V. This represents improved performance within the same electrical operating envelope and does not create incompatibility with existing designs.

Q: Is the package configuration identical between these parts?

A: Yes. Both the KSB772OS and KSB772YS use the TO-126-3 Through Hole package. No PCB layout modifications or mechanical changes are required for substitution.

Q: Are there any compliance or regulatory differences between these parts?

A: Both parts carry identical ECCN classification (EAR99), confirming equivalent export control status. No additional compliance considerations apply to this substitution.

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