KSD471A-Y-AP Equivalent & Substitute Parts

Part Overview

The KSD471A-Y-AP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, rated for 30V collector-emitter breakdown voltage and 1A maximum collector current. This component is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing production and maintenance applications. The through-hole TO-92 package configuration remains widely supported by active manufacturers, enabling direct functional replacement with parametrically equivalent or superior devices.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	1	A
Power - Max	800	mW
Frequency - Transition	130	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 100mA, 1V	—
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A	—
Current - Collector Cutoff (Max)	100	nA
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitute parts for the KSD471A-Y-AP are classified into two categories based on electrical parameter alignment:

Parametric Equivalents (KSD471AYTA, KSD471ACYTA): These devices match all critical electrical specifications of the original part, including 30V breakdown voltage, 1A collector current, 800mW power dissipation, 130MHz transition frequency, and identical saturation characteristics. Both are manufactured by Fairchild Semiconductor and maintain active product status. These substitutes provide direct functional replacement without circuit redesign.

Manufacturer-Recommended Substitute (PN2222ATA): This onsemi device exceeds the original specifications in voltage rating (40V vs. 30V), transition frequency (300MHz vs. 130MHz), and maintains the 1A collector current rating. The PN2222ATA is active and widely available. Substitution is valid for applications where the original 30V rating is not a design constraint, as the higher voltage rating provides additional design margin.

Substitution validity is determined by the following criteria:

Transistor type (NPN)
Maximum collector current (1A minimum)
Collector-emitter breakdown voltage (≥30V)
Power dissipation (≥800mW)
Through-hole TO-92 package compatibility
Operating temperature range (≥150°C maximum)

Parameter Comparison

Parameter	KSD471A-Y-AP	PN2222ATA	KSD471AYTA	KSD471ACYTA
Manufacturer	Micro Commercial Co	onsemi	Fairchild Semiconductor	Fairchild Semiconductor
Product Status	Obsolete	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30V	40V	30V	30V
Current - Collector (Ic) (Max)	1A	1A	1A	1A
Power - Max	800mW	625mW	800mW	800mW
Frequency - Transition	130MHz	300MHz	130MHz	130MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	120 @ 100mA, 1V	100 @ 150mA, 10V	120 @ 100mA, 1V	120 @ 100mA, 1V
Vce Saturation (Max) @ Ib, Ic	500mV @ 100mA, 1A	1V @ 50mA, 500mA	500mV @ 100mA, 1A	500mV @ 100mA, 1A
Current - Collector Cutoff (Max)	100nA	10nA	100nA	100nA
Operating Temperature (Max)	150°C	150°C	150°C	150°C
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole
RoHS Status	RoHS Compliant	ROHS3 Compliant	Not specified	Not specified
Inventory Status	693 Pcs	5400 Pcs	43260 Pcs	5946 Pcs

Engineering Selection Recommendations

For Direct Replacement (Parametric Match): KSD471AYTA and KSD471ACYTA are the preferred substitutes when exact electrical parameter matching is required. Both devices are manufactured by Fairchild Semiconductor with active product status and maintain identical specifications for voltage, current, power, and saturation characteristics. KSD471AYTA offers significantly higher inventory availability (43,260 units) compared to KSD471ACYTA (5,946 units), making it the optimal choice for volume production requirements.

For Enhanced Performance Applications: PN2222ATA is suitable for applications where the original 30V specification does not represent a design constraint. This onsemi device provides superior transition frequency (300MHz vs. 130MHz) and lower collector cutoff current (10nA vs. 100nA), enabling use in higher-frequency switching applications. The 40V breakdown voltage rating provides additional design margin for transient protection. PN2222ATA maintains active status with robust inventory availability (5,400 units).

Compliance Considerations: All substitute parts maintain RoHS compliance status. PN2222ATA carries ROHS3 certification with REACH unaffected status, providing enhanced regulatory documentation for international applications.

Frequently Asked Questions (FAQ)

Q: Can KSD471AYTA directly replace KSD471A-Y-AP without circuit modification?

A: Yes. KSD471AYTA is a parametric equivalent with identical electrical specifications across all critical parameters: 30V breakdown voltage, 1A collector current, 800mW power dissipation, 130MHz transition frequency, and matching saturation characteristics. The TO-92-3 package is mechanically and electrically identical. No circuit redesign is required.

Q: What is the difference between KSD471AYTA and KSD471ACYTA?

A: Both devices are parametric equivalents manufactured by Fairchild Semiconductor with identical electrical specifications. The primary difference is inventory availability: KSD471AYTA has 43,260 units in stock versus 5,946 units for KSD471ACYTA. For production applications, KSD471AYTA is recommended due to superior supply availability.

Q: Can PN2222ATA be used as a substitute despite the higher voltage rating?

A: Yes, PN2222ATA is a valid substitute for applications where the 30V specification does not represent a design constraint. The 40V breakdown voltage is a superset of the original 30V rating and provides additional design margin. However, the reduced power dissipation (625mW vs. 800mW) and different saturation characteristics (1V @ 50mA, 500mA vs. 500mV @ 100mA, 1A) must be evaluated against specific circuit requirements.

Q: Are all substitute parts available in the same TO-92 package?

A: Yes. All substitute parts use the TO-92-3 (TO-226AA) formed leads package, which is mechanically and electrically compatible with the original KSD471A-Y-AP. Pin configuration and lead spacing are identical, enabling direct socket replacement.

Q: What is the inventory status for each substitute?

A: KSD471AYTA has the highest availability with 43,260 units in stock. PN2222ATA has 5,400 units available. KSD471ACYTA has 5,946 units. For applications requiring immediate delivery or high-volume procurement, KSD471AYTA is the recommended choice.

Q: Do the substitute parts have different operating temperature ranges?

A: KSD471AYTA and KSD471ACYTA maintain the same maximum operating temperature (150°C) as the original part. PN2222ATA specifies an operating range of -55°C to 150°C, providing extended low-temperature capability. For applications requiring operation below 0°C, PN2222ATA is the appropriate selection.

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