2N4403_D11Z Equivalent & Substitute Parts

Part Overview

The 2N4403_D11Z is a PNP bipolar junction transistor manufactured by onsemi, rated for 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. This device is packaged in TO-92-3 through-hole configuration and is suitable for general-purpose switching and amplification applications operating across a temperature range of -55°C to 150°C.

The 2N4403_D11Z 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 repair requirements for legacy systems utilizing this component.

Key Parameters

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

Substitute Part Grouping Explanation

Substitute parts for the 2N4403_D11Z are classified into two categories based on electrical and mechanical compatibility:

Direct Substitutes (Identical Electrical and Mechanical Parameters): Direct substitutes maintain all key electrical parameters: 40 V collector-emitter breakdown voltage, 600 mA maximum collector current, 625 mW power dissipation, 200 MHz transition frequency, 100 minimum DC current gain, and identical saturation voltage characteristics. These parts are packaged in TO-92-3 through-hole configuration with formed leads. Direct substitutes differ only in packaging format (Cut Tape versus Bulk) and product status (Active versus Obsolete).

Similar Substitutes (Compatible Electrical Parameters with Package or Rating Variations): Similar substitutes maintain core PNP transistor functionality and critical voltage/current ratings but may differ in one or more of the following: maximum collector current, power dissipation, transition frequency, or operating temperature range. These parts are mechanically compatible through-hole devices but may have different package designations or slightly modified electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic Max (mA)	Vce Breakdown (V)	Power Max (mW)	Frequency (MHz)	hFE Min @ Ic, Vce	Package	Packaging Format
2N4403_D11Z	onsemi	Obsolete	600	40	625	200	100 @ 150 mA, 2 V	TO-92-3	—
2N4403TA	onsemi	Active	600	40	625	200	100 @ 150 mA, 2 V	TO-92-3	Cut Tape (CT)
2N4403TF	onsemi	Active	600	40	625	200	100 @ 150 mA, 2 V	TO-92-3	Cut Tape (CT)
2N4403BU	Fairchild Semiconductor	Active	600	40	625	200	100 @ 150 mA, 2 V	TO-92-3	Bulk
2N4403-AP	Micro Commercial Co	Obsolete	600	40	600	200	100 @ 150 mA, 2 V	TO-92-3	Cut Tape (CT)
ZTX549STZ	Diodes Incorporated	Active	1000	30	1000	100	100 @ 500 mA, 2 V	E-Line (TO-92 compatible)	Cut Tape (CT)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The 2N4403TA and 2N4403TF, both manufactured by onsemi, provide direct electrical equivalence to the 2N4403_D11Z. Both parts are currently in active product status with ROHS3 compliance certification. The 2N4403TA offers higher inventory availability (60,100 pieces) compared to 2N4403TF (1,500 pieces). Both are supplied in Cut Tape packaging format. Selection between these two should be based on procurement lead time and inventory requirements.

The 2N4403BU, manufactured by Fairchild Semiconductor, maintains identical electrical specifications and is supplied in Bulk packaging format. This part is active and suitable for high-volume applications. Inventory availability is substantial at 69,662 pieces.

For Applications Tolerating Parameter Variations:

The 2N4403-AP, manufactured by Micro Commercial Co, provides electrical compatibility with a minor power dissipation reduction (600 mW versus 625 mW). This part carries obsolete status and should be considered only when inventory of active alternatives is constrained.

The ZTX549STZ, manufactured by Diodes Incorporated, is suitable only for applications where the following parameter changes are acceptable: reduced collector-emitter breakdown voltage (30 V versus 40 V), increased maximum collector current (1 A versus 600 mA), increased power dissipation (1 W versus 625 mW), and reduced transition frequency (100 MHz versus 200 MHz). This part operates across an extended temperature range (-55°C to 200°C) and is packaged in E-Line configuration with TO-92 mechanical compatibility. Selection of this part requires circuit-level analysis to confirm voltage and frequency requirements.

Frequently Asked Questions (FAQ)

Q: Can 2N4403TA or 2N4403TF be used as direct replacements for 2N4403_D11Z?

A: Yes. Both 2N4403TA and 2N4403TF are direct electrical and mechanical equivalents. All critical parameters—collector current, breakdown voltage, power dissipation, transition frequency, and DC current gain—are identical. The only differences are packaging format (Cut Tape versus unspecified for the original) and active product status versus obsolete status. Both are ROHS3 compliant.

Q: What is the difference between 2N4403BU and 2N4403TA?

A: Both parts are electrically identical with matching specifications for collector current (600 mA), breakdown voltage (40 V), power dissipation (625 mW), and transition frequency (200 MHz). The primary difference is the packaging format: 2N4403BU is supplied in Bulk format, while 2N4403TA is supplied in Cut Tape format. Selection depends on procurement and assembly requirements.

Q: Is ZTX549STZ a suitable substitute for 2N4403_D11Z?

A: ZTX549STZ is a similar substitute only for applications where reduced collector-emitter breakdown voltage (30 V versus 40 V) and reduced transition frequency (100 MHz versus 200 MHz) are acceptable. The ZTX549STZ offers higher current capability (1 A versus 600 mA) and greater power dissipation (1 W versus 625 mW). Circuit-level verification is required to confirm compatibility with voltage and frequency requirements.

Q: What does "obsolete product status" mean for the 2N4403_D11Z?

A: Obsolete status indicates that the manufacturer has discontinued production and support for this part. Existing inventory may be available from distributors, but long-term supply cannot be guaranteed. Active alternatives such as 2N4403TA, 2N4403TF, or 2N4403BU should be considered for new designs or ongoing production to ensure supply chain continuity.

Q: Are all substitute parts ROHS3 compliant?

A: The 2N4403TA, 2N4403TF, 2N4403BU, and 2N4403-AP are all ROHS3 compliant. The ZTX549STZ is also ROHS3 compliant. All parts carry REACH Unaffected status.

Q: Can I use 2N4403-AP as a substitute?

A: 2N4403-AP is electrically compatible with a minor power dissipation specification of 600 mW versus 625 mW for the original part. However, this part carries obsolete product status. It should be considered only when active alternatives are unavailable and the reduced power rating is acceptable for the application.

Q: What is the difference between TO-92-3 and E-Line packaging?

A: TO-92-3 is a standard three-lead through-hole package with formed leads. E-Line is a variant package format that is mechanically compatible with TO-92 pin configuration. The ZTX549STZ uses E-Line packaging, which maintains mechanical compatibility but may have different lead spacing or formation characteristics. Physical verification is recommended before substitution in existing PCB designs.

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