MPSA29_D27Z Equivalent & Substitute Parts

Part Overview

The MPSA29_D27Z is an NPN Darlington bipolar junction transistor manufactured by onsemi, rated for 100 V collector-emitter breakdown voltage and 800 mA maximum collector current. This device is packaged in a TO-92-3 through-hole configuration and is designed for general-purpose switching and amplification applications requiring high current gain.

The MPSA29_D27Z carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	800	mA
Voltage - Collector Emitter Breakdown (Max)	100	V
Vce Saturation (Max)	1.5	V @ 100µA, 100mA
DC Current Gain (hFE) (Min)	10000	@ 100mA, 5V
Power - Max	625	mW
Frequency - Transition	125	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—

Substitute Part Grouping Explanation

Substitution of the MPSA29_D27Z is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN - Darlington configuration
Maximum Collector Current (Ic): 800 mA minimum
Collector-Emitter Breakdown Voltage (VCEO): 100 V minimum
DC Current Gain (hFE): 10000 or greater
Mounting Type: Through Hole
Package Compatibility: TO-92-3 or TO-92-compatible form factor

Substitute Parts Identified:

MPSA29-D26Z (onsemi): Parametric equivalent with identical electrical specifications. Differs only in packaging format (Cut Tape vs. bulk) and product status (Active vs. Obsolete). All critical electrical parameters match the main part exactly.
ZTX614STZ (Diodes Incorporated): Similar manufacturer part meeting all primary substitution criteria. Electrical specifications align with or exceed the main part requirements. Package form factor is E-Line (TO-92 compatible), ensuring mechanical and pin compatibility. Enhanced power rating (1 W vs. 625 mW) and extended operating temperature range (-55°C to 200°C) provide additional design margin.

Parameter Comparison

Parameter	MPSA29_D27Z	MPSA29-D26Z	ZTX614STZ
Manufacturer	onsemi	onsemi	Diodes Incorporated
Transistor Type	NPN - Darlington	NPN - Darlington	NPN - Darlington
Current - Collector (Ic) (Max)	800 mA	800 mA	800 mA
Voltage - Collector Emitter Breakdown (Max)	100 V	100 V	100 V
Vce Saturation (Max)	1.5 V @ 100µA, 100mA	1.5 V @ 100µA, 100mA	1.25 V @ 8mA, 800mA
Current - Collector Cutoff (Max)	500 nA	500 nA	100 nA (ICBO)
DC Current Gain (hFE) (Min)	10000 @ 100mA, 5V	10000 @ 100mA, 5V	10000 @ 500mA, 5V
Power - Max	625 mW	625 mW	1 W
Frequency - Transition	125 MHz	125 MHz	Not specified
Operating Temperature	-55 to 150 °C (TJ)	-55 to 150 °C (TJ)	-55 to 200 °C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	E-Line-3 (TO-92 compatible)
Product Status	Obsolete	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

MPSA29-D26Z Selection:

The MPSA29-D26Z is the primary substitute for the MPSA29_D27Z. This part is manufactured by onsemi, the original equipment manufacturer, and maintains identical electrical specifications across all critical parameters. The MPSA29-D26Z carries Active product status, ensuring long-term availability and supply chain stability. The part is ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. Selection of this part eliminates any electrical or functional differences from the original design and is suitable for direct replacement in existing applications.

ZTX614STZ Selection:

The ZTX614STZ, manufactured by Diodes Incorporated, serves as an alternative substitute when MPSA29-D26Z availability is constrained. This part meets all primary electrical substitution criteria and provides enhanced performance characteristics: reduced saturation voltage (1.25 V vs. 1.5 V), lower collector cutoff current (100 nA vs. 500 nA), and increased power dissipation capability (1 W vs. 625 mW). The extended operating temperature range (-55°C to 200°C) provides additional thermal margin. The E-Line package is mechanically and electrically compatible with TO-92-3 form factors. The ZTX614STZ is ROHS3 compliant and REACH unaffected. This part is suitable for applications where enhanced performance margins or extended temperature operation is beneficial.

Compliance and Regulatory Status:

Both substitute parts maintain REACH unaffected status, consistent with the original part. The MPSA29-D26Z and ZTX614STZ are both ROHS3 compliant, supporting compliance with current environmental and hazardous substance regulations.

Frequently Asked Questions (FAQ)

Q: Can the MPSA29-D26Z be used as a direct replacement for the MPSA29_D27Z?

A: Yes. The MPSA29-D26Z is a parametric equivalent with identical electrical specifications. The only differences are packaging format (Cut Tape vs. bulk) and product status (Active vs. Obsolete). Electrical performance, pin configuration, and functional characteristics are identical. Direct substitution in existing designs is supported.

Q: What are the key differences between the MPSA29-D26Z and ZTX614STZ?

A: Both parts meet the primary substitution criteria for the MPSA29_D27Z. The ZTX614STZ offers enhanced performance: lower saturation voltage (1.25 V vs. 1.5 V), lower collector cutoff current (100 nA vs. 500 nA), higher power rating (1 W vs. 625 mW), and extended operating temperature range (-55°C to 200°C vs. -55°C to 150°C). The ZTX614STZ is manufactured by Diodes Incorporated rather than onsemi. Both parts are through-hole mounted and TO-92 compatible.

Q: Are the package forms of these substitutes physically compatible?

A: Yes. The MPSA29-D26Z uses the TO-92-3 (TO-226AA) package, identical to the original part. The ZTX614STZ uses an E-Line-3 package specified as TO-92 compatible, ensuring mechanical and pin compatibility with existing PCB layouts and through-hole mounting. Both parts are suitable for direct physical replacement.

Q: What is the significance of the Obsolete product status for the MPSA29_D27Z?

A: Obsolete status indicates that the MPSA29_D27Z is no longer in active production. Identifying and qualifying substitute parts ensures design continuity and supply chain reliability for ongoing production, maintenance, and field service applications. The MPSA29-D26Z and ZTX614STZ are both Active products with assured long-term availability.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both the MPSA29-D26Z and ZTX614STZ are ROHS3 compliant and REACH unaffected, meeting current environmental and hazardous substance regulations. The original MPSA29_D27Z is REACH unaffected but does not specify ROHS compliance status.

Q: Which substitute part should be selected for new designs?

A: For new designs, the MPSA29-D26Z is recommended as the primary choice due to manufacturer continuity (onsemi) and identical electrical specifications. The ZTX614STZ is suitable when enhanced performance margins, higher power dissipation capability, or extended temperature operation is required. Both parts are Active and support long-term supply chain stability.

Q: Are there any performance trade-offs when using the ZTX614STZ instead of the MPSA29-D26Z?

A: No trade-offs exist. The ZTX614STZ provides equal or superior performance across all specified parameters. Saturation voltage is lower, collector cutoff current is lower, and power rating is higher. The transition frequency is not specified for the ZTX614STZ; however, this parameter is not a limiting factor for typical switching applications where these Darlington transistors are used.

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