2N4403TA Equivalent & Substitute Parts

Part Overview

The 2N4403TA is an onsemi PNP bipolar junction transistor (BJT) rated for 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is packaged in a TO-92-3 through-hole configuration and operates across a temperature range of -55°C to 150°C. The 2N4403TA maintains Active product status and is ROHS3 compliant, making it suitable for general-purpose switching and amplification applications in legacy and modern circuit designs. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the PNP BJT transistor category.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	40	V
Current - Collector (Ic) (Max)	600	mA
Power - Max	625	mW
Frequency - Transition	200	MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 2V	—
Vce Saturation (Max) @ Ib, Ic	750mV @ 50mA, 500mA	—
Operating Temperature Range	-55 to 150	°C
Mounting Type	Through Hole	—
Package / Case	TO-92-3 (TO-226AA)	—
Product Status	Active	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 2N4403TA are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalents share identical electrical specifications, mechanical packaging, and product status. These parts are interchangeable without circuit modification:

Matching collector-emitter breakdown voltage: 40 V
Matching maximum collector current: 600 mA
Matching power dissipation: 625 mW
Matching transition frequency: 200 MHz
Matching DC current gain: 100 @ 150mA, 2V
Matching saturation voltage: 750mV @ 50mA, 500mA
Identical TO-92-3 package configuration
Active product status

Similar Alternatives provide functional substitution with variations in one or more electrical parameters. These parts operate within the same application space but require circuit evaluation:

Variations in maximum collector current, voltage rating, or power dissipation
Variations in transition frequency or operating temperature range
Obsolete or alternative product status
Compatible through-hole packaging

Parameter Comparison

Parameter	2N4403TA	2N4403TF	2N4403TFR	2N4403-AP	ZTX549STZ
Manufacturer	onsemi	onsemi	onsemi	Micro Commercial Co	Diodes Incorporated
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V	40 V	30 V
Current - Collector (Ic) (Max)	600 mA	600 mA	600 mA	—	1 A
Power - Max	625 mW	625 mW	625 mW	600 mW	1 W
Frequency - Transition	200 MHz	200 MHz	200 MHz	200 MHz	100 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 500mA, 2V
Vce Saturation (Max) @ Ib, Ic	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	750mV @ 50mA, 500mA	750mV @ 200mA, 2A
Operating Temperature Range	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 150°C	-55 to 200°C
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-92-3	TO-92-3	TO-92-3	TO-92-3	E-Line-3 (TO-92 compatible)
Product Status	Active	Active	Active	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Equivalents (2N4403TF, 2N4403TFR)

The 2N4403TF and 2N4403TFR are direct electrical and mechanical equivalents of the 2N4403TA. Both parts are manufactured by onsemi, maintain Active product status, and carry identical electrical specifications across all critical parameters including voltage rating, current capacity, power dissipation, and frequency response. Both parts are ROHS3 compliant and packaged in TO-92-3 configuration. These parts are suitable for direct substitution without circuit modification. Selection between these equivalents may be based on packaging format (Cut Tape) and inventory availability.

Similar Alternative (2N4403-AP)

The 2N4403-AP, manufactured by Micro Commercial Co, provides electrical compatibility with the 2N4403TA across voltage, current gain, saturation voltage, and frequency specifications. However, this part carries Obsolete product status, indicating discontinued manufacturing and potential supply constraints. The 2N4403-AP is ROHS3 compliant and packaged in TO-92-3 configuration. Use of this part is limited to legacy system maintenance where new stock availability is confirmed.

Similar Alternative (ZTX549STZ)

The ZTX549STZ, manufactured by Diodes Incorporated, operates as a functional alternative with notable parameter variations. This device features higher maximum collector current (1 A versus 600 mA), higher power dissipation (1 W versus 625 mW), and extended operating temperature range (-55°C to 200°C versus -55°C to 150°C). However, the ZTX549STZ has reduced collector-emitter breakdown voltage (30 V versus 40 V) and lower transition frequency (100 MHz versus 200 MHz). The ZTX549STZ maintains Active product status and ROHS3 compliance. This part is suitable for applications requiring higher current capacity or extended temperature operation, provided circuit voltage ratings accommodate the 30 V maximum specification.

Frequently Asked Questions (FAQ)

Q: Can 2N4403TF and 2N4403TFR be used interchangeably with 2N4403TA?

A: Yes. Both 2N4403TF and 2N4403TFR are direct equivalents with identical electrical specifications, mechanical packaging, and product status. No circuit modification is required for substitution.

Q: What is the primary difference between 2N4403TA and ZTX549STZ?

A: The ZTX549STZ differs in four key parameters: collector-emitter breakdown voltage (30 V versus 40 V), maximum collector current (1 A versus 600 mA), power dissipation (1 W versus 625 mW), and transition frequency (100 MHz versus 200 MHz). The ZTX549STZ is suitable for applications requiring higher current capacity but operates at lower voltage and frequency ratings.

Q: Is 2N4403-AP a viable substitute for 2N4403TA?

A: The 2N4403-AP provides electrical compatibility but carries Obsolete product status. Use is limited to legacy system maintenance where new stock availability is confirmed. Active alternatives (2N4403TF, 2N4403TFR) are preferred for new designs.

Q: Are all substitute parts packaged identically to 2N4403TA?

A: The 2N4403TF, 2N4403TFR, and 2N4403-AP use identical TO-92-3 packaging. The ZTX549STZ uses E-Line-3 packaging, which is TO-92 compatible but may have minor physical differences. Verify mechanical fit in board-level applications.

Q: What compliance certifications apply to all listed parts?

A: All parts listed are ROHS3 compliant and REACH unaffected. All parts carry EAR99 export classification. Verify specific compliance requirements for your application and region.

Q: Can ZTX549STZ be used in circuits designed for 40 V operation?

A: No. The ZTX549STZ has a maximum collector-emitter breakdown voltage of 30 V. Use in 40 V circuits exceeds device ratings and creates reliability risk. Select 2N4403TF or 2N4403TFR for 40 V applications.

Q: Which substitute part has the widest operating temperature range?

A: The ZTX549STZ operates across -55°C to 200°C, compared to -55°C to 150°C for 2N4403TA, 2N4403TF, 2N4403TFR, and 2N4403-AP. Select ZTX549STZ for extended temperature applications.

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