KSA708CYBU Equivalent & Substitute Parts

Part Overview

The KSA708CYBU is a PNP bipolar junction transistor manufactured by onsemi, designed for small-signal switching and amplification applications. This component operates at a maximum collector current of 700 mA with a collector-emitter breakdown voltage of 60 V and delivers a maximum power dissipation of 800 mW. The device is housed in a TO-92-3 through-hole package suitable for through-hole PCB assembly.

The KSA708CYBU is classified as an obsolete product. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for legacy systems and new designs requiring equivalent electrical performance.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) (Max)	700	mA
Voltage - Collector Emitter Breakdown (Max)	60	V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	V
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 50mA, 2V	—
Power - Max	800	mW
Frequency - Transition	50	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the KSA708CYBU is determined by strict equivalence across all critical electrical and mechanical parameters. The following parameters establish the substitution criteria:

Electrical Parameters:

Transistor Type: PNP configuration
Maximum Collector Current (Ic): 700 mA
Collector-Emitter Breakdown Voltage: 60 V
Vce Saturation characteristics: 700mV @ 50mA, 500mA
Collector Cutoff Current (ICBO): 100 nA
DC Current Gain (hFE): Minimum 120 @ 50mA, 2V
Maximum Power Dissipation: 800 mW
Transition Frequency: 50 MHz
Maximum Operating Temperature: 150°C

Mechanical Parameters:

Mounting Type: Through Hole
Package Configuration: TO-92-3 (TO-226AA)

Substitute parts must match all electrical specifications and maintain identical package geometry to ensure direct PCB compatibility without layout modifications.

Parameter Comparison

Parameter	KSA708CYBU (onsemi)	KSA708YBU (Fairchild Semiconductor)
Transistor Type	PNP	PNP
Current - Collector (Ic) (Max)	700 mA	700 mA
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V
Vce Saturation (Max) @ Ib, Ic	700mV @ 50mA, 500mA	700mV @ 50mA, 500mA
Current - Collector Cutoff (Max)	100 nA	100 nA
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 50mA, 2V	120 @ 50mA, 2V
Power - Max	800 mW	800 mW
Frequency - Transition	50 MHz	50 MHz
Operating Temperature (TJ)	150°C	150°C
Mounting Type	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)

Engineering Selection Recommendations

The KSA708YBU manufactured by Fairchild Semiconductor is a parametric equivalent substitute for the obsolete KSA708CYBU. Both devices share identical electrical specifications and mechanical packaging, enabling direct substitution in circuit designs.

Product Status Consideration: The KSA708CYBU is classified as obsolete, while the KSA708YBU maintains active product status. Selection of the KSA708YBU ensures access to current manufacturing, established supply chains, and ongoing technical support from the manufacturer.

Compliance and Certification: Both parts are classified under ECCN EAR99 and comply with applicable export control regulations. The KSA708YBU carries REACH compliance classification, supporting regulatory requirements for new designs and production environments.

Inventory Availability: The KSA708YBU is available in significantly higher quantities (91,001 pieces) compared to the obsolete KSA708CYBU (936 pieces), providing superior supply chain reliability for production planning and long-term component sourcing.

Frequently Asked Questions (FAQ)

Q: Can the KSA708YBU directly replace the KSA708CYBU without circuit modifications?

A: Yes. The KSA708YBU is a parametric equivalent with identical electrical specifications and TO-92-3 package geometry. Direct substitution is supported without circuit redesign or PCB layout changes.

Q: What are the critical parameters that define substitution compatibility?

A: Substitution compatibility is determined by matching transistor type (PNP), maximum collector current (700 mA), collector-emitter breakdown voltage (60 V), saturation voltage characteristics, DC current gain (hFE minimum 120), power dissipation (800 mW), transition frequency (50 MHz), and package configuration (TO-92-3 through-hole).

Q: Why is the KSA708YBU recommended over the KSA708CYBU?

A: The KSA708YBU is recommended because the KSA708CYBU is classified as obsolete. The KSA708YBU maintains active product status, ensuring continued availability, manufacturing support, and compliance with current regulatory standards.

Q: Are there any packaging differences between these parts?

A: No. Both the KSA708CYBU and KSA708YBU use identical TO-92-3 (TO-226AA) through-hole packaging. Physical dimensions and pin configurations are equivalent, supporting direct PCB compatibility.

Q: What is the difference between the two part numbers if they are electrically identical?

A: The part numbers reflect different manufacturers and product lines. The KSA708CYBU is an onsemi product, while the KSA708YBU is manufactured by Fairchild Semiconductor. Both maintain the same electrical and mechanical specifications, establishing them as parametric equivalents within the KSA708 product family.

Q: Is the KSA708YBU suitable for new design implementations?

A: Yes. The KSA708YBU is classified as an active product with established supply availability. It is suitable for new designs requiring PNP small-signal transistor functionality within the specified electrical and thermal parameters.

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