MPSA43-AP Equivalent & Substitute Parts

Part Overview

The MPSA43-AP is an NPN bipolar junction transistor manufactured by Micro Commercial Co, designed for general-purpose switching and amplification applications. Specified for 200 V collector-emitter breakdown voltage and 300 mA maximum collector current, this device operates across a temperature range of -55°C to 150°C. The MPSA43-AP is classified as obsolete, necessitating identification of equivalent substitute components that maintain functional compatibility while offering improved availability and extended product lifecycle support.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) Max	300	mA
Voltage - Collector Emitter Breakdown (Max)	200	V
Power - Max	625	mW
Frequency - Transition	50	MHz
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MPSA43-AP is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type must be NPN
Collector current rating must equal or exceed 300 mA
Collector-emitter breakdown voltage must equal or exceed 200 V
Transition frequency must equal or exceed 50 MHz
Operating temperature range must encompass the application requirements
Mounting type must be Through Hole with TO-92 compatible package configuration
RoHS3 compliance required

Substitute Parts Identified:

The ZTX696BSTZ and ZTX458STZ both satisfy the primary substitution criteria. The ZTX696BSTZ provides enhanced current handling (500 mA) and improved frequency response (70 MHz) while maintaining voltage compatibility at 180 V. The ZTX458STZ offers elevated voltage capability (400 V) with matched current and frequency specifications. Both devices feature E-Line package configurations that are mechanically and electrically compatible with TO-92 footprints and extend the operating temperature range to 200°C.

Parameter Comparison

Parameter	MPSA43-AP	ZTX696BSTZ	ZTX458STZ	Unit
Manufacturer	Micro Commercial Co	Diodes Incorporated	Diodes Incorporated	—
Product Status	Obsolete	Active	Active	—
Transistor Type	NPN	NPN	NPN	—
Current - Collector (Ic) Max	300	500	300	mA
Voltage - Collector Emitter Breakdown (Max)	200	180	400	V
Vce Saturation (Max)	400 @ 2mA, 20mA	250 @ 5mA, 200mA	500 @ 6mA, 50mA	mV
Current - Collector Cutoff (Max)	100	100	100	nA
DC Current Gain (hFE) Min	80 @ 10mA, 10V	150 @ 200mA, 5V	100 @ 50mA, 10V	—
Power - Max	625	1000	1000	mW
Frequency - Transition	50	70	50	MHz
Operating Temperature Range	-55 to 150	-55 to 200	-55 to 200	°C
Mounting Type	Through Hole	Through Hole	Through Hole	—
Package / Case	TO-92-3	E-Line-3 (TO-92 compatible)	E-Line-3 (TO-92 compatible)	—
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—
Inventory Status	950 Pcs (Obsolete)	17400 Pcs (Active)	4200 Pcs (Active)	—

Engineering Selection Recommendations

ZTX696BSTZ Selection Criteria:

The ZTX696BSTZ is suitable for applications where the MPSA43-AP operates at or near maximum collector current specifications. This substitute provides 500 mA maximum collector current, exceeding the 300 mA requirement of the original part. The 180 V collector-emitter breakdown voltage is marginally lower than the MPSA43-AP specification; therefore, this device is appropriate only for circuits where the maximum applied voltage does not exceed 180 V. The ZTX696BSTZ offers superior transition frequency (70 MHz versus 50 MHz) and extended operating temperature range (-55°C to 200°C). Active product status and substantial inventory availability (17,400 units) support long-term supply chain reliability. ROHS3 compliance is maintained.

ZTX458STZ Selection Criteria:

The ZTX458STZ is suitable for applications requiring voltage headroom beyond the MPSA43-AP specification. This substitute provides 400 V collector-emitter breakdown voltage, offering significant margin for high-voltage switching applications. Collector current rating matches the original part at 300 mA. Transition frequency is equivalent at 50 MHz. The ZTX458STZ extends the operating temperature range to 200°C and maintains active product status with adequate inventory (4,200 units). ROHS3 compliance is maintained.

Selection Logic:

Select ZTX696BSTZ for applications operating at maximum current levels where voltage requirements do not exceed 180 V
Select ZTX458STZ for applications requiring voltage ratings above 200 V or where additional voltage margin is necessary
Both substitutes are active products with superior long-term availability compared to the obsolete MPSA43-AP
Both substitutes maintain identical RoHS3 compliance and regulatory status

Frequently Asked Questions (FAQ)

Q: Can the ZTX696BSTZ replace the MPSA43-AP in all applications?

A: The ZTX696BSTZ is a suitable substitute provided the circuit maximum applied collector-emitter voltage does not exceed 180 V. The MPSA43-AP is rated to 200 V; therefore, circuits designed to operate at voltages between 180 V and 200 V require the ZTX458STZ instead.

Q: What is the primary advantage of using ZTX458STZ over ZTX696BSTZ?

A: The ZTX458STZ provides 400 V collector-emitter breakdown voltage, offering compatibility with high-voltage applications and additional design margin. The ZTX696BSTZ provides higher collector current capacity (500 mA) and improved transition frequency (70 MHz), making it suitable for high-current or high-frequency switching applications.

Q: Are the E-Line packages of the substitute parts mechanically compatible with TO-92 footprints?

A: Yes. Both ZTX696BSTZ and ZTX458STZ feature E-Line-3 package configurations specified as TO-92 compatible. The formed leads and pin spacing conform to standard TO-92 through-hole mounting patterns, enabling direct board-level substitution without layout modification.

Q: Do the substitute parts maintain RoHS3 compliance?

A: Yes. Both ZTX696BSTZ and ZTX458STZ are ROHS3 compliant, matching the regulatory status of the MPSA43-AP.

Q: What is the significance of the extended operating temperature range in the substitute parts?

A: The substitute parts extend the maximum operating temperature from 150°C (MPSA43-AP) to 200°C. This provides additional thermal margin for applications operating in elevated-temperature environments. Circuits designed for the original 150°C maximum remain fully compatible.

Q: How do the DC current gain specifications compare between the main part and substitutes?

A: The MPSA43-AP specifies minimum hFE of 80 at 10 mA and 10 V. The ZTX696BSTZ specifies minimum hFE of 150 at 200 mA and 5 V, and the ZTX458STZ specifies minimum hFE of 100 at 50 mA and 10 V. Higher current gain in the substitutes may require circuit bias network adjustment in sensitive applications.

Q: Are there inventory or lead-time advantages to selecting one substitute over the other?

A: The ZTX696BSTZ offers substantially higher inventory availability (17,400 units) compared to the ZTX458STZ (4,200 units). For applications without specific voltage or current constraints, the ZTX696BSTZ may provide superior supply chain reliability.

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