2STN2340 Equivalent & Substitute Parts

Part Overview

The 2STN2340 is a PNP bipolar junction transistor manufactured by STMicroelectronics, rated for 40 V collector-emitter breakdown voltage and 3 A maximum collector current. The device is housed in a SOT-223 surface mount package and is designed for general-purpose switching and amplification applications. The 2STN2340 is classified as obsolete, necessitating identification of active equivalent parts that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	3	A
Collector-Emitter Breakdown Voltage (Max)	40	V
Power Dissipation (Max)	1.6	W
Transition Frequency	100	MHz
DC Current Gain (hFE Min)	180 @ 1A, 2V	—
Vce Saturation (Max)	350 mV @ 150mA, 3A	—
Operating Temperature (Max)	150	°C
Package Type	SOT-223	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitute parts for the 2STN2340 are selected based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor polarity: PNP
Collector current rating: 3 A minimum
Collector-emitter breakdown voltage: 40 V minimum
Package type: SOT-223 surface mount
Mounting compatibility: TO-261-4 or TO-261AA case outline

Substitute parts are grouped into two categories:

Category 1: Direct Electrical Equivalents (40 V, 3 A Rating) Parts meeting or exceeding the 2STN2340 electrical specifications with identical voltage and current ratings. These include FZT790ATC, FZT790ATA, FZT1151ATA, DJT4030P-13, NJT4030PT3G, NJV4030PT1G, and NJV4030PT3G.

Category 2: Reduced Voltage Rating (30 V, 3 A Rating) The DMJT9435-13 operates at 30 V maximum collector-emitter breakdown voltage, which is below the 2STN2340 specification. This part is suitable only for applications where the operating voltage does not exceed 30 V.

Category 3: Reduced Current Rating (45 V, 1 A Rating) The BCP51TA operates at 1 A maximum collector current, which is below the 2STN2340 specification. This part is suitable only for applications requiring less than 1 A collector current.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) [A]	Vce(br) [V]	Power [W]	fT [MHz]	hFE (Min)	Vce Sat (Max) [mV]	Status	Package
2STN2340	STMicroelectronics	3	40	1.6	100	180 @ 1A, 2V	350 @ 150mA, 3A	Obsolete	SOT-223
FZT790ATC	Diodes Incorporated	3	40	2	100	300 @ 10mA, 2V	750 @ 50mA, 2A	Active	SOT-223-3
FZT790ATA	Diodes Incorporated	3	40	2	100	300 @ 10mA, 2V	750 @ 50mA, 2A	Active	SOT-223-3
FZT1151ATA	Diodes Incorporated	3	40	2.5	145	250 @ 500mA, 2V	300 @ 250mA, 3A	Active	SOT-223-3
DJT4030P-13	Diodes Incorporated	3	40	1.2	150	200 @ 1A, 1V	500 @ 300mA, 3A	Active	SOT-223-3
NJT4030PT3G	onsemi	3	40	2	160	200 @ 1A, 1V	500 @ 300mA, 3A	Active	SOT-223
NJV4030PT1G	onsemi	3	40	2	160	200 @ 1A, 1V	500 @ 300mA, 3A	Active	SOT-223
NJV4030PT3G	onsemi	3	40	2	160	200 @ 1A, 1V	500 @ 300mA, 3A	Active	SOT-223
BCP51TA	Diodes Incorporated	1	45	2	125	40 @ 150mA, 2V	500 @ 50mA, 500mA	Active	SOT-223-3
DMJT9435-13	Diodes Incorporated	3	30	1.2	160	125 @ 800mA, 1V	550 @ 300mA, 3A	Active	SOT-223-3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The FZT790ATC, FZT790ATA, FZT1151ATA, DJT4030P-13, NJT4030PT3G, NJV4030PT1G, and NJV4030PT3G are active products that maintain the 40 V collector-emitter breakdown voltage and 3 A collector current ratings of the 2STN2340. All substitute parts are ROHS3 compliant and REACH unaffected, matching the regulatory status of the original part. These parts are suitable for direct replacement in applications where the 2STN2340 was originally specified.

Secondary Substitutes (Reduced Ratings):

The BCP51TA is rated for 1 A maximum collector current and is suitable only for applications where collector current does not exceed 1 A. The DMJT9435-13 is rated for 30 V maximum collector-emitter breakdown voltage and is suitable only for applications where the operating voltage does not exceed 30 V. These parts are not suitable for applications requiring the full 3 A current or 40 V voltage capability of the 2STN2340.

Packaging Considerations:

All substitute parts are available in SOT-223 surface mount packages with TO-261-4 or TO-261AA case outlines, ensuring mechanical compatibility with the 2STN2340 footprint. Packaging variants (Tape & Reel or Cut Tape) do not affect electrical performance and are selected based on procurement requirements.

Frequently Asked Questions (FAQ)

Q: Can the FZT790ATC be used as a direct replacement for the 2STN2340?

A: Yes. The FZT790ATC meets the electrical specifications of the 2STN2340 with identical 40 V collector-emitter breakdown voltage and 3 A collector current ratings. Both parts are housed in SOT-223 packages and are ROHS3 compliant. The FZT790ATC is an active product, whereas the 2STN2340 is obsolete.

Q: What is the difference between FZT790ATC and FZT790ATA?

A: FZT790ATC is supplied in Tape & Reel packaging, while FZT790ATA is supplied in Cut Tape packaging. The electrical specifications are identical. Selection between these variants depends on procurement and assembly requirements.

Q: Can the BCP51TA replace the 2STN2340 in all applications?

A: No. The BCP51TA is rated for 1 A maximum collector current, compared to 3 A for the 2STN2340. The BCP51TA is suitable only for applications where collector current does not exceed 1 A. Applications requiring 3 A operation require a substitute with a 3 A rating.

Q: Can the DMJT9435-13 replace the 2STN2340 in all applications?

A: No. The DMJT9435-13 is rated for 30 V maximum collector-emitter breakdown voltage, compared to 40 V for the 2STN2340. The DMJT9435-13 is suitable only for applications where the operating voltage does not exceed 30 V. Applications requiring 40 V operation require a substitute with a 40 V rating.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant and REACH unaffected, matching the regulatory compliance of the 2STN2340.

Q: What is the difference between NJT4030PT3G, NJV4030PT1G, and NJV4030PT3G?

A: These parts are manufactured by onsemi and share identical electrical specifications with 40 V collector-emitter breakdown voltage and 3 A collector current ratings. The designations reflect different packaging variants (Cut Tape & Digi-Reel or Tape & Reel) and manufacturing codes. Selection depends on procurement requirements.

Q: Do all substitute parts have the same transition frequency as the 2STN2340?

A: No. The 2STN2340 has a transition frequency of 100 MHz. Substitute parts have transition frequencies ranging from 100 MHz to 160 MHz. Higher transition frequencies indicate improved high-frequency performance and do not prevent substitution in applications designed for the 2STN2340.

Q: Are there inventory differences between substitute parts?

A: Yes. Inventory levels vary by part number and supplier. FZT790ATA has the highest inventory at 43,900 pieces, while FZT790ATC has the lowest at 2,100 pieces. Inventory availability should be confirmed with the supplier for procurement planning.

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