DNLS320A-7 Equivalent & Substitute Parts

Part Overview

The DNLS320A-7 is a Surface Mount NPN Bipolar Junction Transistor manufactured by Diodes Incorporated, rated for 20 V collector-emitter breakdown voltage and 2 A maximum collector current in a SOT-23-3 package. This device is classified as Obsolete, indicating discontinued production and limited availability. Equivalent and substitute parts are necessary to maintain design continuity and ensure component procurement for new production runs and field replacements.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	20 V
Current - Collector (Ic) (Max)	2 A
Power - Max	600 mW
Frequency - Transition	220 MHz
Package / Case	SOT-23-3 (TO-236-3, SC-59)
Operating Temperature	-55°C ~ 150°C (TJ)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the DNLS320A-7 is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 20 V (minimum requirement)
Current - Collector (Ic) (Max): 2 A (minimum requirement)
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Mounting Type: Surface Mount
Operating Temperature Range: -55°C ~ 150°C (TJ)

Acceptable Variation Parameters:

Power - Max: 600 mW or greater
Frequency - Transition: 220 MHz or greater
DC Current Gain (hFE): 200 or greater at specified conditions
Vce Saturation: 310 mV or lower at specified conditions

Substitute parts are grouped into two categories: Direct Manufacturer Substitutes (same manufacturer, active product status) and Cross-Manufacturer Equivalents (alternative manufacturers, active product status). Parts that exceed the minimum electrical specifications while maintaining package and thermal compatibility are classified as functional equivalents.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)max	Power (Max)	Frequency	Package	Status
DNLS320A-7	Diodes Incorporated	2 A	20 V	600 mW	220 MHz	SOT-23-3	Obsolete
DSS4320T-7	Diodes Incorporated	2 A	20 V	600 mW	100 MHz	SOT-23-3	Active
FMMT618TA	Diodes Incorporated	2.5 A	20 V	625 mW	140 MHz	SOT-23-3	Active
PBSS4320T,215	Nexperia USA Inc.	2 A	20 V	540 mW	100 MHz	SOT-23-3	Active
NSV20201LT1G	onsemi	2 A	20 V	460 mW	150 MHz	SOT-23-3	Active
NSS20201LT1G	onsemi	2 A	20 V	460 mW	150 MHz	SOT-23-3	Active

Engineering Selection Recommendations

Direct Manufacturer Substitute (Recommended Primary Choice):

DSS4320T-7 (Diodes Incorporated) is the recommended primary substitute. This part maintains identical electrical specifications for collector current (2 A) and collector-emitter breakdown voltage (20 V) while offering active product status with established supply chain availability. The transition frequency of 100 MHz is lower than the original DNLS320A-7 (220 MHz) but remains suitable for applications not requiring the higher frequency performance. This part is available in Tape & Reel packaging with 15,520 pieces in stock.

Manufacturer-Recommended Substitute (Enhanced Performance):

FMMT618TA (Diodes Incorporated) is designated as manufacturer-recommended and provides enhanced electrical performance with 2.5 A maximum collector current and 625 mW power dissipation, exceeding the original specifications. This part is suitable for designs requiring higher current capability or thermal margin. Active product status with 54,762 pieces in stock ensures long-term availability.

Cross-Manufacturer Equivalents (Alternative Sources):

NSS20201LT1G and NSV20201LT1G (onsemi) are functionally equivalent parts meeting the 2 A / 20 V specifications with active product status. These parts provide alternative sourcing options and are available in high quantities (18,180 and 13,063 pieces respectively). Both parts feature 150 MHz transition frequency and lower power dissipation (460 mW) compared to the original specification.

PBSS4320T,215 (Nexperia USA Inc.) meets the 2 A / 20 V specifications and includes AEC-Q100 automotive qualification. This part is suitable for applications requiring automotive-grade components and is available in Tape & Reel packaging with 9,461 pieces in stock.

Compliance Verification:

All recommended substitute parts maintain ROHS3 compliance, MSL Level 1 (Unlimited), and REACH Unaffected status, ensuring regulatory compatibility with the original DNLS320A-7.

Frequently Asked Questions (FAQ)

Q: Can DSS4320T-7 directly replace DNLS320A-7 in all applications?

A: DSS4320T-7 is a direct electrical substitute for applications where the 100 MHz transition frequency is sufficient. The lower frequency specification does not affect DC switching applications or low-frequency signal amplification. Applications requiring the full 220 MHz bandwidth should evaluate FMMT618TA or NSS20201LT1G as alternatives.

Q: What is the difference between NSS20201LT1G and NSV20201LT1G?

A: Both parts are manufactured by onsemi and meet identical electrical specifications (2 A, 20 V, 150 MHz, 460 mW). The primary difference is internal device structure and application optimization. Both are functionally equivalent for the DNLS320A-7 replacement.

Q: Is FMMT618TA a drop-in replacement or does it require circuit redesign?

A: FMMT618TA is a functional equivalent with enhanced specifications (2.5 A vs. 2 A, 625 mW vs. 600 mW). The higher current rating and power dissipation provide additional design margin. No circuit redesign is required; however, the lower Vce saturation (200 mV vs. 310 mV) may improve switching efficiency in saturation-mode applications.

Q: Why is PBSS4320T,215 listed as an alternative if it has lower power rating (540 mW)?

A: PBSS4320T,215 meets the minimum electrical requirements (2 A, 20 V) and maintains SOT-23-3 package compatibility. The 540 mW power rating is lower than the original 600 mW specification but remains adequate for most applications. This part is included as an alternative sourcing option with automotive qualification (AEC-Q100).

Q: Are all substitute parts available in the same packaging options?

A: All substitute parts are available in SOT-23-3 surface mount packaging. Packaging formats differ: DSS4320T-7 and PBSS4320T,215 are supplied in Tape & Reel; FMMT618TA is available in Cut Tape & Digi-Reel; NSS20201LT1G and NSV20201LT1G are supplied in Tape & Reel. Verify packaging requirements with procurement specifications.

Q: What is the operating temperature range for all substitute parts?

A: DSS4320T-7, FMMT618TA, NSS20201LT1G, and NSV20201LT1G all maintain the -55°C ~ 150°C (TJ) operating temperature range. PBSS4320T,215 specifies 150°C maximum junction temperature without lower limit specification. Verify thermal requirements for applications operating below -55°C.

Q: Can I use MMBT2484LT1G or MMBT6429LT1G as substitutes?

A: MMBT2484LT1G and MMBT6429LT1G do not meet the minimum electrical specifications for DNLS320A-7 replacement. MMBT2484 is rated for 100 mA maximum collector current (vs. 2 A required) and 60 V breakdown voltage. MMBT6429 is rated for 200 mA maximum collector current. These parts are not suitable substitutes.

Q: What is the RoHS and REACH compliance status of all substitutes?

A: All recommended substitute parts (DSS4320T-7, FMMT618TA, PBSS4320T,215, NSS20201LT1G, NSV20201LT1G) are ROHS3 Compliant and REACH Unaffected, maintaining full regulatory compatibility with the original DNLS320A-7.

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