ZXT11N20DFTC Equivalent & Substitute Parts

Part Overview

The ZXT11N20DFTC is an NPN bipolar junction transistor (BJT) manufactured by Diodes Incorporated, designed for surface mount applications in the SOT-23-3 package. This device is rated for 20 V collector-emitter breakdown voltage with a maximum collector current of 2.5 A and 625 mW power dissipation. The transistor operates across a temperature range of -55°C to 150°C and features a transition frequency of 160 MHz.

The ZXT11N20DFTC is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	20	V
Current - Collector (Ic) (Max)	2.5	A
Power - Max	625	mW
Frequency - Transition	160	MHz
Vce Saturation (Max) @ Ib, Ic	130 mV @ 250 mA, 2.5 A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	300 @ 100 mA, 2 V	—
Operating Temperature Range	-55 to 150	°C
Package / Case	SOT-23-3	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ZXT11N20DFTC is determined by electrical and mechanical compatibility within the following criteria:

Primary Substitution Criteria:

Transistor Type: NPN
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C to 150°C (minimum requirement)
Voltage - Collector Emitter Breakdown (Max): Equal to or greater than 20 V
Current - Collector (Ic) (Max): Equal to or greater than 2.5 A
Power - Max: Equal to or greater than 625 mW

Parametric Equivalent Classification: Parts meeting all primary criteria with identical or superior electrical ratings are classified as parametric equivalents. The ZXT11N20DFTA (Diodes Incorporated) is a parametric equivalent, differing only in packaging format (Tape & Reel versus individual packaging).

Functional Substitute Classification: Parts meeting the SOT-23-3 package requirement and NPN transistor type but with reduced current or power ratings are classified as functional substitutes. These parts are suitable for applications where the full 2.5 A collector current is not required. Functional substitutes include MMBT2484LT1G, MMBT2484LT3G, MMBT6429LT1G, and NSV20201LT1G.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max) [A]	Vce Breakdown (Max) [V]	Power (Max) [mW]	Frequency [MHz]	Package	Packaging Format
ZXT11N20DFTC	Diodes Incorporated	Obsolete	2.5	20	625	160	SOT-23-3	Individual
ZXT11N20DFTA	Diodes Incorporated	Obsolete	2.5	20	625	160	SOT-23-3	Tape & Reel
NSV20201LT1G	onsemi	Active	2.0	20	460	150	SOT-23-3	Tape & Reel
MMBT6429LT1G	onsemi	Active	0.2	45	225	700	SOT-23-3	Tape & Reel
MMBT2484LT1G	onsemi	Active	0.1	60	225	—	SOT-23-3	Cut Tape & Digi-Reel
MMBT2484LT3G	onsemi	Active	0.1	60	225	—	SOT-23-3	Tape & Reel

Engineering Selection Recommendations

Parametric Equivalent Selection: The ZXT11N20DFTA is the direct parametric equivalent to the ZXT11N20DFTC. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications. The ZXT11N20DFTA is available in Tape & Reel packaging format, providing improved supply chain availability (98,610 units in stock versus 797 units for the original part). Both parts maintain ROHS3 compliance and identical moisture sensitivity levels. Selection of ZXT11N20DFTA is recommended for applications requiring the full 2.5 A collector current specification without design modification.

Active Component Substitutes: For applications where collector current requirements do not exceed 2.0 A, the NSV20201LT1G (onsemi) is an active product offering equivalent 20 V breakdown voltage with 2.0 A maximum collector current. This part maintains active product status, ensuring long-term availability and supply chain stability. The NSV20201LT1G is ROHS3 compliant and operates across the same temperature range (-55°C to 150°C).

Limited Current Applications: The MMBT6429LT1G and MMBT2484LT1G/LT3G are suitable only for applications where collector current does not exceed 200 mA and 100 mA respectively. These parts offer higher voltage ratings (45 V and 60 V) and are active products. Selection of these parts requires design verification to confirm that application current requirements fall within the reduced ratings.

Compliance and Availability: All substitute parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, matching the compliance profile of the original ZXT11N20DFTC. Packaging format selection (individual, cut tape, or tape & reel) should be determined by procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can the ZXT11N20DFTA be used as a direct replacement for the ZXT11N20DFTC?

A: Yes. The ZXT11N20DFTA is a parametric equivalent with identical electrical specifications. The only difference is packaging format (Tape & Reel versus individual packaging). No circuit design changes are required.

Q: What is the primary limitation when substituting with MMBT2484LT1G or MMBT2484LT3G?

A: The MMBT2484 series is limited to 100 mA maximum collector current, compared to the 2.5 A rating of the ZXT11N20DFTC. These parts are suitable only for low-current applications. Verify that your application current requirements do not exceed 100 mA before selection.

Q: Is NSV20201LT1G a suitable substitute for all applications using ZXT11N20DFTC?

A: The NSV20201LT1G is suitable for applications requiring up to 2.0 A collector current. Applications requiring the full 2.5 A specification will exceed this part's rating. Verify application current requirements before selection. The NSV20201LT1G is an active product, providing superior long-term availability compared to the obsolete ZXT11N20DFTC.

Q: Do all substitute parts maintain the same package footprint?

A: Yes. All listed substitute parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), ensuring identical PCB footprint compatibility. Packaging format (individual, cut tape, or tape & reel) affects procurement and assembly processes but not physical component dimensions.

Q: Are there compliance or regulatory differences between the main part and substitutes?

A: No. All parts listed maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status. Regulatory and environmental compliance profiles are identical across all options.

Q: Why is the ZXT11N20DFTC classified as obsolete?

A: The ZXT11N20DFTC is marked as obsolete by the manufacturer. The parametric equivalent ZXT11N20DFTA remains available in higher quantities. For new designs or long-term production, selection of active alternatives such as NSV20201LT1G is recommended to ensure sustained supply chain availability.

Q: What is the difference between ZXT11N20DFTC and ZXT11N20DFTA packaging?

A: The ZXT11N20DFTC is supplied in individual packaging format, while the ZXT11N20DFTA is supplied in Tape & Reel (TR) format. Both contain identical components. Tape & Reel format is standard for high-volume manufacturing and automated assembly processes.

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