SS9012HBU Equivalent & Substitute Parts

Part Overview

The SS9012HBU is a PNP bipolar junction transistor manufactured by onsemi, rated for 20 V collector-emitter breakdown voltage and 500 mA maximum collector current in a TO-92-3 through-hole package. This device is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and production continuity. The SS9012HBU delivers 625 mW maximum power dissipation with a minimum DC current gain of 144 at 50 mA collector current and 1 V collector-emitter voltage.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	20	V
Current - Collector (Ic) (Max)	500	mA
Power - Max	625	mW
Vce Saturation (Max) @ Ib, Ic	600 mV @ 50 mA, 500 mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	144 @ 50 mA, 1 V	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (TJ)	150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
Product Status	Obsolete	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS9012HBU is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Voltage rating must equal or exceed 20 V collector-emitter breakdown
Current rating must equal or exceed 500 mA maximum collector current
Power dissipation must equal or exceed 625 mW
Mounting type must be through-hole compatible
Package must be physically compatible with TO-92-3 footprint or equivalent form factor

Secondary Compatibility Factors:

Saturation voltage characteristics at specified operating points
DC current gain (hFE) minimum specifications
Collector cutoff current (ICBO) leakage characteristics
Operating temperature range
RoHS and REACH compliance status

The substitute parts listed below satisfy the primary substitution criteria and maintain electrical compatibility within the specified parameter ranges. Parts are grouped by their ability to directly replace the SS9012HBU in existing circuit designs.

Parameter Comparison

Parameter	SS9012HBU (Main)	ZTX718	ZTX948	ZTX948STZ	KSA1013YTA
Manufacturer	onsemi	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	onsemi
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	20 V	20 V	20 V	20 V	160 V
Current - Collector (Ic) (Max)	500 mA	2.5 A	4.5 A	4.5 A	1 A
Power - Max	625 mW	1 W	1.2 W	1.2 W	900 mW
Vce Saturation (Max) @ Ib, Ic	600 mV @ 50 mA, 500 mA	260 mV @ 200 mA, 2.5 A	310 mV @ 300 mA, 5 A	310 mV @ 300 mA, 5 A	1.5 V @ 50 mA, 500 mA
DC Current Gain (hFE) (Min)	144 @ 50 mA, 1 V	150 @ 2 A, 2 V	100 @ 1 A, 1 V	100 @ 1 A, 1 V	160 @ 200 mA, 5 V
Current - Collector Cutoff (Max)	100 nA	100 nA	50 nA	50 nA	1 µA
Frequency - Transition	—	180 MHz	80 MHz	80 MHz	50 MHz
Operating Temperature (TJ)	150 °C	-55 °C ~ 200 °C	-55 °C ~ 200 °C	-55 °C ~ 200 °C	150 °C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	E-Line-3 (TO-92 compatible)	E-Line-3 (TO-92 compatible)	E-Line-3 (TO-92 compatible)	TO-92-3 Long Body
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement Candidates (Matched Voltage Rating):

The ZTX718, ZTX948, and ZTX948STZ are active PNP transistors manufactured by Diodes Incorporated with identical 20 V collector-emitter breakdown voltage ratings to the SS9012HBU. All three devices exceed the 500 mA current requirement and 625 mW power dissipation specification. The ZTX718 provides 2.5 A maximum collector current, while ZTX948 and ZTX948STZ both deliver 4.5 A maximum collector current. These devices feature E-Line-3 packages that are physically compatible with TO-92-3 footprints. All three are ROHS3 compliant and carry active product status, ensuring long-term availability and supply chain continuity.

Higher Voltage Alternative:

The KSA1013YTA, manufactured by onsemi, provides a 160 V collector-emitter breakdown voltage rating with 1 A maximum collector current and 900 mW power dissipation. This device exceeds all electrical specifications of the SS9012HBU and is suitable for applications requiring higher voltage headroom. The KSA1013YTA is packaged in TO-92-3 Long Body format with formed leads and maintains ROHS3 compliance. This part is recommended for designs where voltage margin enhancement is beneficial.

Compliance and Availability:

All substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the regulatory posture of the original SS9012HBU. The ZTX718, ZTX948, and ZTX948STZ carry active product status with substantial inventory availability (21,400, 3,913, and 5,070 units respectively), ensuring reliable procurement. The KSA1013YTA offers the highest inventory level at 105,300 units.

Frequently Asked Questions (FAQ)

Q: Can the ZTX718, ZTX948, or ZTX948STZ directly replace the SS9012HBU in existing designs?

A: Yes. All three devices are PNP transistors with 20 V collector-emitter breakdown voltage ratings matching the SS9012HBU specification. Each exceeds the 500 mA current and 625 mW power requirements. The E-Line-3 packages are physically compatible with TO-92-3 footprints. Pin configuration remains consistent across all devices.

Q: What is the difference between ZTX948 and ZTX948STZ?

A: ZTX948 and ZTX948STZ are electrically identical PNP transistors with 4.5 A maximum collector current and 20 V voltage rating. The primary difference is packaging: ZTX948 is supplied in Bulk format, while ZTX948STZ is supplied in Tape & Box (TB) format with formed leads. Both are ROHS3 compliant and active products.

Q: Why does the KSA1013YTA have a 160 V rating instead of 20 V?

A: The KSA1013YTA is a higher voltage alternative suitable for applications requiring increased voltage margin. The 160 V rating provides design flexibility for circuits operating at elevated voltages while maintaining compatibility with 20 V nominal designs. The device is backward compatible with SS9012HBU applications.

Q: Are all substitute parts through-hole mounted?

A: Yes. The SS9012HBU and all listed substitute parts (ZTX718, ZTX948, ZTX948STZ, and KSA1013YTA) are through-hole mounted devices. Package compatibility is maintained across all substitutes.

Q: What is the inventory status of these substitute parts?

A: All substitute parts carry active product status with current inventory availability. ZTX718 has 21,400 units in stock, ZTX948 has 3,913 units, ZTX948STZ has 5,070 units, and KSA1013YTA has 105,300 units available.

Q: Do the substitute parts meet the same compliance requirements as the SS9012HBU?

A: Yes. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory compliance profile of the SS9012HBU.

Q: Which substitute part offers the best current handling capability?

A: The ZTX948 and ZTX948STZ both provide 4.5 A maximum collector current, the highest among all listed substitutes. These devices are suitable for applications requiring maximum current capacity within the 20 V voltage class.

Q: Can the KSA1013YTA be used in circuits designed for the SS9012HBU?

A: Yes. The KSA1013YTA is electrically compatible with the SS9012HBU and exceeds all electrical specifications. The higher 160 V voltage rating provides additional design margin. Pin configuration and through-hole mounting are consistent with the original device.

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