STSA1805-AP Equivalent & Substitute Parts

Part Overview

The STSA1805-AP is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for general-purpose switching and amplification applications. This device operates at 60 V collector-emitter breakdown voltage with a maximum collector current of 5 A and delivers 1.1 W power dissipation in a Through Hole TO-92AP package. The part is currently in Last Time Buy status, indicating discontinued production with limited availability. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product support for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	5	A
Power - Max	1.1	W
Frequency - Transition	150	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 100mA, 2V	—
Vce Saturation (Max) @ Ib, Ic	600mV @ 200mA, 5A	—
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Operating Temperature (Max)	150	°C

Substitute Part Grouping Explanation

Substitution of the STSA1805-AP is determined by strict electrical and mechanical compatibility across the following critical parameters:

Electrical Compatibility Criteria:

Transistor Type: NPN configuration required
Voltage - Collector Emitter Breakdown (Max): Minimum 60 V
Current - Collector (Ic) (Max): Minimum 5 A for direct substitution; lower ratings acceptable only if circuit design permits reduced current handling
Power - Max: Minimum 1.1 W for thermal equivalence
Frequency - Transition: Minimum 150 MHz for switching performance
DC Current Gain (hFE): Minimum 200 @ 100mA, 2V for gain matching
Vce Saturation: Maximum 600mV @ 200mA, 5A for saturation performance

Mechanical Compatibility Criteria:

Mounting Type: Through Hole required
Package / Case: TO-92-3 or TO-92 compatible form factors
Operating Temperature: Maximum 150°C junction temperature

The substitute parts listed below meet these criteria within the specified electrical and mechanical boundaries.

Parameter Comparison

Parameter	STSA1805-AP (Main)	ZXTN2010A (Substitute)	KSD1616AGTA (Substitute)
Manufacturer	STMicroelectronics	Diodes Incorporated	Fairchild Semiconductor
Transistor Type	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	60 V	60 V	60 V
Current - Collector (Ic) (Max)	5 A	4.5 A	1 A
Power - Max	1.1 W	1 W	750 mW
Frequency - Transition	150 MHz	130 MHz	160 MHz
DC Current Gain (hFE) (Min)	200 @ 100mA, 2V	100 @ 2A, 1V	200 @ 100mA, 2V
Vce Saturation (Max)	600mV @ 200mA, 5A	210mV @ 200mA, 5A	300mV @ 50mA, 1A
Current - Collector Cutoff (Max)	100nA (ICBO)	50nA (ICBO)	100nA (ICBO)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	E-Line-3 (TO-92 compatible)	TO-92-3
Operating Temperature (Max)	150°C	150°C	150°C
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

ZXTN2010A (Diodes Incorporated): This substitute provides the closest electrical performance to the STSA1805-AP. The ZXTN2010A delivers 4.5 A maximum collector current, which approaches the 5 A rating of the main part. Power dissipation is rated at 1 W, slightly lower than the 1.1 W specification. The transition frequency of 130 MHz is marginally lower than 150 MHz. Vce saturation is superior at 210mV compared to 600mV, indicating better switching efficiency. The device is in Active product status with ROHS3 compliance and REACH unaffected certification. The E-Line-3 package is mechanically compatible with TO-92 form factors. This part is suitable for applications where the 4.5 A current rating is acceptable and where improved saturation characteristics provide design benefits.

KSD1616AGTA (Fairchild Semiconductor): This substitute is appropriate for applications with reduced current requirements. The KSD1616AGTA is rated for 1 A maximum collector current, representing a significant reduction from the 5 A specification of the STSA1805-AP. Power dissipation is 750 mW. The transition frequency of 160 MHz exceeds the main part specification. DC current gain matches the main part at 200 @ 100mA, 2V. The TO-92-3 package provides direct mechanical compatibility. This part is suitable only for circuits designed to operate within the 1 A current envelope and is not recommended for applications requiring the full 5 A capability of the original part.

Product Status Consideration: The STSA1805-AP is in Last Time Buy status, indicating production discontinuation. Both substitute parts are in Active status, ensuring continued availability and long-term supply chain support.

Frequently Asked Questions (FAQ)

Q: Can the ZXTN2010A directly replace the STSA1805-AP in all applications?

A: The ZXTN2010A is electrically compatible for applications operating at or below 4.5 A collector current. The 60 V breakdown voltage, Through Hole mounting, and TO-92 compatible package provide mechanical and electrical compatibility. However, applications requiring the full 5 A rating of the STSA1805-AP must be evaluated to confirm operation within the 4.5 A limit of the substitute.

Q: Is the KSD1616AGTA suitable for high-current applications?

A: No. The KSD1616AGTA is rated for a maximum collector current of 1 A, which is significantly lower than the 5 A specification of the STSA1805-AP. This substitute is appropriate only for low-current signal switching and amplification applications. Applications requiring 5 A operation cannot use this part.

Q: What are the package compatibility considerations?

A: The STSA1805-AP uses a TO-92-3 package with formed leads. The ZXTN2010A uses an E-Line-3 package, which is mechanically compatible with TO-92 form factors and can be used in the same PCB footprint. The KSD1616AGTA uses a TO-92-3 package, providing direct package compatibility. Both substitutes are suitable for Through Hole mounting applications.

Q: How do saturation characteristics affect substitution?

A: The STSA1805-AP specifies 600mV Vce saturation at 200mA, 5A. The ZXTN2010A provides superior saturation at 210mV at the same conditions, resulting in lower power dissipation during saturation. The KSD1616AGTA specifies 300mV saturation but only at 50mA, 1A, which is not directly comparable due to different operating points. Lower saturation voltage generally improves switching efficiency and reduces heat generation.

Q: Are there compliance or certification differences between the main part and substitutes?

A: The STSA1805-AP and ZXTN2010A are both ROHS3 compliant and REACH unaffected. The KSD1616AGTA compliance status is not specified in the available data. For applications requiring specific regulatory compliance, verification of the KSD1616AGTA certification status is necessary before selection.

Q: What is the significance of the Last Time Buy status for the STSA1805-AP?

A: Last Time Buy status indicates that STMicroelectronics has discontinued production of the STSA1805-AP. Existing inventory is limited, and no future production is planned. Designs currently using this part should transition to an active substitute to ensure long-term supply chain continuity and avoid obsolescence-related production delays.

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