STN1802 Equivalent & Substitute Parts

Part Overview

The STN1802 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 60 V collector-emitter breakdown voltage and 3 A maximum collector current in a surface mount SOT-223 package. This device is classified as obsolete, which necessitates identification of active equivalent and substitute components for ongoing design requirements and production continuity. The STN1802 operates at a transition frequency of 150 MHz with a maximum power dissipation of 1.6 W and is RoHS3 compliant.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	60	V
Current - Collector (Ic) (Max)	3	A
Vce Saturation (Max) @ Ib, Ic	400 mV @ 150 mA, 3 A	—
Power - Max	1.6	W
Frequency - Transition	150	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-261-4, TO-261AA	—
Supplier Device Package	SOT-223	—
RoHS Status	ROHS3 Compliant	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the STN1802 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): 60 V minimum
Current - Collector (Ic) (Max): 3 A minimum
Package / Case: TO-261-4 or TO-261AA (SOT-223 family)
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Vce Saturation characteristics
DC Current Gain (hFE)
Frequency - Transition
Operating Temperature range
RoHS3 Compliance

Substitute parts are grouped into two categories based on electrical performance alignment:

Category A - Direct Current Rating Match (3 A): Parts with 3 A maximum collector current rating that maintain 60 V breakdown voltage specification and SOT-223 packaging.

Category B - Enhanced Current Rating (6 A): Parts with 6 A maximum collector current rating that exceed the STN1802 specification, suitable for applications requiring higher current capacity while maintaining voltage and package compatibility.

Category C - Reduced Current Rating (1 A): Parts with 1 A maximum collector current rating, suitable only for applications where the full 3 A capability is not required.

Category D - Reduced Voltage Rating (40 V): Parts with 40 V breakdown voltage, suitable only for applications where the full 60 V specification is not required.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)max	Vce Sat (Max)	Power (Max)	Freq (fT)	Package	Status	MSL
STN1802	STMicroelectronics	3 A	60 V	400 mV @ 150 mA, 3 A	1.6 W	150 MHz	SOT-223	Obsolete	3
BCP55TA	Diodes Incorporated	1 A	60 V	500 mV @ 50 mA, 500 mA	2 W	150 MHz	SOT-223-3	Active	1
FZT491TA	Diodes Incorporated	1 A	60 V	500 mV @ 100 mA, 1 A	2 W	150 MHz	SOT-223-3	Active	1
FZT651TA	Diodes Incorporated	3 A	60 V	600 mV @ 300 mA, 3 A	2 W	175 MHz	SOT-223-3	Active	1
FZT651TC	Diodes Incorporated	3 A	60 V	600 mV @ 300 mA, 3 A	2 W	175 MHz	SOT-223-3	Active	1
FZT851TA	Diodes Incorporated	6 A	60 V	375 mV @ 300 mA, 6 A	3 W	130 MHz	SOT-223-3	Active	1
NSS40301MZ4T1G	onsemi	3 A	40 V	200 mV @ 300 mA, 3 A	2 W	215 MHz	SOT-223	Active	1
NSS40301MZ4T3G	onsemi	3 A	40 V	200 mV @ 300 mA, 3 A	2 W	215 MHz	SOT-223	Active	1
NSS60601MZ4T1G	onsemi	6 A	60 V	300 mV @ 600 mA, 6 A	800 mW	100 MHz	SOT-223	Active	1
NSS60601MZ4T3G	onsemi	6 A	60 V	300 mV @ 600 mA, 6 A	800 mW	100 MHz	SOT-223	Active	1
NZT560A	onsemi	3 A	60 V	400 mV @ 300 mA, 3 A	1 W	75 MHz	SOT-223-4	Active	1

Engineering Selection Recommendations

For Direct Replacement (Equivalent Current and Voltage Rating):

FZT651TA and FZT651TC are the closest functional equivalents to the STN1802. Both devices are manufactured by Diodes Incorporated, rated for 3 A collector current and 60 V breakdown voltage in SOT-223-3 packaging. These parts are in active production status with RoHS3 compliance and MSL 1 rating, providing superior moisture sensitivity characteristics compared to the obsolete STN1802. The FZT651 series exhibits slightly higher Vce saturation (600 mV versus 400 mV) and enhanced transition frequency (175 MHz versus 150 MHz). FZT651TC is supplied in Tape & Reel packaging, while FZT651TA is supplied in Cut Tape format.

NZT560A, manufactured by onsemi, provides an alternative with matching 3 A and 60 V ratings in SOT-223-4 packaging. This device maintains the 400 mV Vce saturation specification of the STN1802 but operates at a lower transition frequency of 75 MHz. The NZT560A is active production status with MSL 1 rating and RoHS3 compliance.

For Higher Current Applications (6 A Rating):

FZT851TA and NSS60601MZ4T1G/NSS60601MZ4T3G provide 6 A collector current capability while maintaining 60 V breakdown voltage. These devices are suitable for applications requiring current capacity beyond the STN1802 specification. FZT851TA offers improved Vce saturation (375 mV) and higher power rating (3 W). NSS60601 series devices provide 800 mW power rating with 300 mV Vce saturation. All are active production with MSL 1 rating and RoHS3 compliance.

For Reduced Current Applications (1 A Rating):

BCP55TA and FZT491TA are suitable only for applications where 1 A collector current is sufficient. Both maintain 60 V breakdown voltage and 150 MHz transition frequency. These devices are active production with superior MSL 1 rating and RoHS3 compliance.

For Reduced Voltage Applications (40 V Rating):

NSS40301MZ4T1G and NSS40301MZ4T3G are suitable only for applications where 40 V breakdown voltage is acceptable. Both maintain 3 A collector current capability and offer enhanced transition frequency (215 MHz) with improved Vce saturation (200 mV). These devices are active production with MSL 1 rating and RoHS3 compliance.

All substitute parts listed are RoHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the STN1802.

Frequently Asked Questions (FAQ)

Q: Can FZT651TA directly replace STN1802 in all applications?

A: FZT651TA is electrically compatible with STN1802 for applications requiring 3 A at 60 V in SOT-223 packaging. The primary differences are higher Vce saturation (600 mV versus 400 mV) and enhanced transition frequency (175 MHz versus 150 MHz). Circuit performance must be evaluated for saturation voltage sensitivity. Both devices are RoHS3 compliant and surface mount compatible.

Q: What is the difference between FZT651TA and FZT651TC?

A: FZT651TA and FZT651TC are electrically identical NPN transistors with 3 A, 60 V ratings in SOT-223-3 packaging. The difference is packaging format: FZT651TA is supplied in Cut Tape (CT) format, while FZT651TC is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and volume handling.

Q: Why do some substitutes have lower current ratings than STN1802?

A: BCP55TA and FZT491TA are rated for 1 A maximum collector current, which is lower than the STN1802 3 A rating. These parts are suitable only for applications where the circuit design does not require the full 3 A capability. Using a lower-rated device in a circuit designed for 3 A operation will result in device failure.

Q: Can NSS40301MZ4T1G replace STN1802?

A: NSS40301MZ4T1G is not a direct replacement. While it maintains 3 A collector current and SOT-223 packaging, the breakdown voltage is reduced to 40 V compared to STN1802's 60 V rating. This device is suitable only for applications where the circuit operates at 40 V or lower. Using this part in a 60 V circuit will result in device failure.

Q: What does MSL 1 rating mean compared to MSL 3?

A: MSL (Moisture Sensitivity Level) indicates the device's sensitivity to moisture during storage and handling. MSL 1 (Unlimited) means the device can be stored indefinitely without moisture control. MSL 3 (168 Hours) means the device must be used within 168 hours of package opening or must be re-baked. All active substitute parts listed have MSL 1 rating, providing superior handling flexibility compared to the obsolete STN1802 with MSL 3.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all substitute parts listed in this reference are RoHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the STN1802.

Q: Which substitute offers the best Vce saturation performance?

A: NSS40301MZ4T1G and NSS40301MZ4T3G offer the lowest Vce saturation at 200 mV, followed by NSS60601MZ4T1G and NSS60601MZ4T3G at 300 mV. However, these devices have reduced voltage or current ratings compared to STN1802. For equivalent 3 A, 60 V operation, FZT851TA offers the lowest Vce saturation at 375 mV among 6 A devices.

Q: What is the difference between SOT-223 and SOT-223-3 packaging?

A: SOT-223 and SOT-223-3 refer to the same physical package family (TO-261-4, TO-261AA) used for surface mount transistors. The designation variation reflects different manufacturer nomenclature for the same package type. All parts listed are mechanically compatible in SOT-223 family packaging.

Q: Can I use NSS60601MZ4T1G for higher current applications?

A: NSS60601MZ4T1G is rated for 6 A maximum collector current, exceeding the STN1802's 3 A rating. This device is suitable for applications requiring higher current capacity. However, the transition frequency is lower (100 MHz versus 150 MHz), which may affect high-frequency performance. Circuit evaluation is required for frequency-sensitive applications.

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