2STF1525 Equivalent & Substitute Parts

Part Overview

The 2STF1525 is an NPN bipolar junction transistor manufactured by STMicroelectronics, designed for surface mount applications in the SOT-89 package. This component operates at a maximum collector current of 5 A and collector-emitter breakdown voltage of 25 V, with a maximum power dissipation of 1.4 W. The device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, production continuity, and system maintenance. Active alternatives with comparable electrical characteristics are available from other manufacturers.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Current - Collector (Ic) (Max)	5	A
Voltage - Collector Emitter Breakdown (Max)	25	V
Vce Saturation (Max)	500 mV @ 40 mA, 3.5 A	—
Power - Max	1.4	W
Frequency - Transition	120	MHz
Operating Temperature (TJ)	150	°C
Package / Case	TO-243AA (SOT-89)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2STF1525 is determined by alignment of the following critical electrical and mechanical parameters:

Mandatory Alignment Criteria:

Transistor Type: NPN configuration
Voltage - Collector Emitter Breakdown (Max): 25 V minimum
Package / Case: TO-243AA (SOT-89 or SOT-89-3 variants)
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Performance Parameters for Substitution:

Current - Collector (Ic) (Max): Equal to or greater than 5 A
Power - Max: Equal to or greater than 1.4 W
Frequency - Transition: Equal to or greater than 120 MHz
Operating Temperature: Maximum junction temperature of 150°C or higher

The substitute parts identified below meet these criteria and are classified as active products, ensuring ongoing availability and technical support.

Parameter Comparison

Parameter	2STF1525 (STMicroelectronics)	2SD2153T100U (Rohm Semiconductor)	ZXTN2005ZTA (Diodes Incorporated)
Product Status	Obsolete	Active	Active
Transistor Type	NPN	NPN	NPN
Current - Collector (Ic) (Max)	5 A	2 A	5.5 A
Voltage - Collector Emitter Breakdown (Max)	25 V	25 V	25 V
Vce Saturation (Max)	500 mV @ 40 mA, 3.5 A	500 mV @ 20 mA, 1 A	200 mV @ 150 mA, 6.5 A
Current - Collector Cutoff (Max)	100 nA (ICBO)	500 nA (ICBO)	20 nA (ICBO)
DC Current Gain (hFE) (Min)	150 @ 500 mA, 2 V	820 @ 500 mA, 6 V	300 @ 1 A, 1 V
Power - Max	1.4 W	2 W	2.1 W
Frequency - Transition	120 MHz	110 MHz	150 MHz
Operating Temperature (TJ)	150°C	150°C	−55°C to 150°C
Package / Case	TO-243AA (SOT-89)	TO-243AA (MPT3)	TO-243AA (SOT-89-3)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

ZXTN2005ZTA (Diodes Incorporated) - Primary Substitute

The ZXTN2005ZTA is the preferred substitute for the 2STF1525. This device exceeds the collector current specification (5.5 A versus 5 A), provides higher power dissipation capability (2.1 W versus 1.4 W), and operates at a higher transition frequency (150 MHz versus 120 MHz). The ZXTN2005ZTA maintains identical collector-emitter breakdown voltage (25 V) and package configuration (TO-243AA, SOT-89-3). Both devices are RoHS3 compliant with MSL 1 rating and REACH unaffected status. The ZXTN2005ZTA is classified as an active product with current manufacturing support. The extended operating temperature range (−55°C to 150°C) provides additional thermal margin compared to the 2STF1525.

2SD2153T100U (Rohm Semiconductor) - Secondary Substitute

The 2SD2153T100U is an active alternative suitable for applications where collector current requirements do not exceed 2 A. This device maintains the 25 V collector-emitter breakdown voltage and TO-243AA package configuration. The 2SD2153T100U offers higher power dissipation (2 W versus 1.4 W) and comparable transition frequency (110 MHz). This substitute is appropriate for lower-current circuit implementations and provides RoHS3 compliance with MSL 1 rating. The device is actively manufactured by Rohm Semiconductor.

Compliance and Regulatory Alignment

Both substitute parts maintain full compliance with RoHS3 requirements, REACH unaffected status, and MSL 1 moisture sensitivity classification, ensuring compatibility with existing supply chain and manufacturing processes. All three devices share identical ECCN (EAR99) and HTSUS (8541.29.0075) classifications.

Frequently Asked Questions (FAQ)

Q: Can the ZXTN2005ZTA directly replace the 2STF1525 in all applications?

A: The ZXTN2005ZTA meets or exceeds all critical electrical parameters of the 2STF1525, including collector current (5.5 A versus 5 A), power dissipation (2.1 W versus 1.4 W), and transition frequency (150 MHz versus 120 MHz). Both devices use the TO-243AA package family (SOT-89 and SOT-89-3 variants) with identical pin configurations. Direct substitution is supported for applications operating within the 2STF1525 specifications.

Q: What is the difference between SOT-89 and SOT-89-3 packages?

A: Both SOT-89 and SOT-89-3 are TO-243AA package variants used for three-terminal surface mount transistors. The designations refer to the same physical package footprint and pin configuration. The 2STF1525 uses SOT-89 designation, while the ZXTN2005ZTA uses SOT-89-3 designation. These are mechanically and electrically compatible for PCB assembly and circuit operation.

Q: Why is the 2SD2153T100U listed as a secondary substitute despite lower collector current?

A: The 2SD2153T100U is classified as a secondary substitute because its maximum collector current (2 A) is below the 2STF1525 specification (5 A). This device is suitable only for circuit designs where actual operating collector current does not exceed 2 A. Applications requiring the full 5 A capability must use the ZXTN2005ZTA or equivalent higher-current devices.

Q: Are there any thermal considerations when substituting these devices?

A: The ZXTN2005ZTA provides higher power dissipation capability (2.1 W versus 1.4 W) and an extended operating temperature range (−55°C to 150°C versus 150°C maximum). In applications approaching the 1.4 W power limit of the 2STF1525, the ZXTN2005ZTA offers improved thermal margin. Both devices maintain identical maximum junction temperature ratings of 150°C.

Q: Do all substitute parts maintain RoHS3 compliance?

A: Yes. The 2STF1525, 2SD2153T100U, and ZXTN2005ZTA are all RoHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating and REACH unaffected status. These regulatory alignments ensure compatibility with current manufacturing and supply chain requirements.

Q: What is the significance of the DC Current Gain (hFE) differences between these devices?

A: The DC current gain values are measured at different operating points. The 2STF1525 specifies hFE minimum of 150 @ 500 mA and 2 V, while the ZXTN2005ZTA specifies 300 @ 1 A and 1 V. These differences reflect the distinct design characteristics of each device but do not prevent substitution. Circuit designs should verify that bias network calculations remain valid with the substitute device's hFE characteristics.

Q: Is the 2STF1525 still available for purchase?

A: The 2STF1525 is classified as obsolete. However, 4100 pieces are currently in stock as new original inventory. For new designs or long-term production requirements, substitution with active products such as the ZXTN2005ZTA or 2SD2153T100U is recommended to ensure ongoing availability and manufacturing support.

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