ST13003 Equivalent & Substitute Parts

Part Overview

The ST13003 is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 400 V collector-emitter breakdown voltage and 1.5 A maximum collector current. This device is packaged in SOT-32-3 (TO-225AA, TO-126-3) through-hole configuration and is designed for general-purpose switching and amplification applications requiring moderate voltage and current handling. The part is currently in active production status with 2147 units in stock. Substitute parts become necessary when the primary part is unavailable, when alternative packaging formats are required for assembly compatibility, or when inventory constraints necessitate sourcing from alternative manufacturers while maintaining electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	400	V
Current - Collector (Ic) (Max)	1.5	A
Power - Max	40	W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 500mA, 1.5A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	5 @ 1A, 2V	—
Operating Temperature Range	-40 to 150	°C (TJ)
Mounting Type	Through Hole	—
Package / Case	TO-225AA, TO-126-3	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the ST13003 is determined by strict equivalence across the following critical parameters: NPN transistor type, 400 V maximum collector-emitter breakdown voltage, 1.5 A maximum collector current, through-hole mounting configuration, and TO-225AA or TO-126-3 package compatibility. All substitute parts listed maintain these core electrical specifications and mechanical compatibility requirements.

The substitute parts are grouped into two categories:

Direct Equivalent (Packaging Variant): ST13003-K is an STMicroelectronics part with identical electrical specifications to the ST13003, differing only in packaging format (bulk versus standard packaging). This part maintains all critical parameters including 40 W maximum power dissipation and saturation voltage characteristics.

Cross-Manufacturer Equivalents (Electrical Compatibility with Parameter Variations): FJE3303H1TU, FJE3303H2TU, and KSE13003H1ASTU are manufactured by onsemi and Fairchild Semiconductor respectively. These parts maintain the core voltage and current ratings (400 V, 1.5 A) and through-hole TO-126-3 packaging but exhibit variations in secondary parameters including maximum power dissipation (20 W versus 40 W), saturation voltage (3 V versus 1.5 V), DC current gain specifications, and transition frequency (4 MHz). These variations indicate different performance characteristics within the same voltage and current class.

Parameter Comparison

Parameter	ST13003	ST13003-K	FJE3303H1TU	FJE3303H2TU	KSE13003H1ASTU
Manufacturer	STMicroelectronics	STMicroelectronics	onsemi	Fairchild Semiconductor	onsemi
Transistor Type	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	400 V	400 V	400 V	400 V	400 V
Current - Collector (Ic) (Max)	1.5 A	1.5 A	1.5 A	1.5 A	1.5 A
Power - Max	40 W	40 W	20 W	20 W	20 W
Vce Saturation (Max) @ Ib, Ic	1.5V @ 500mA, 1.5A	1.5V @ 500mA, 1.5A	3V @ 500mA, 1.5A	3V @ 500mA, 1.5A	3V @ 500mA, 1.5A
DC Current Gain (hFE) (Min) @ Ic, Vce	5 @ 1A, 2V	5 @ 1A, 2V	8 @ 500mA, 2V	14 @ 500mA, 2V	9 @ 500mA, 2V
Frequency - Transition	—	—	4 MHz	4 MHz	4 MHz
Operating Temperature (Max)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)	150°C (TJ)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Package / Case	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3	TO-225AA, TO-126-3
Product Status	Active	Active	Active	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not Specified	ROHS3 Compliant

Engineering Selection Recommendations

ST13003-K is the primary direct substitute for ST13003. Both parts are manufactured by STMicroelectronics with identical electrical specifications, operating temperature range, and compliance certifications (ROHS3 Compliant, REACH Unaffected). The ST13003-K differs only in packaging format (bulk) and offers significantly higher inventory availability (105300 units in stock). This part is suitable for direct replacement in all applications where the ST13003 is specified.

FJE3303H1TU, FJE3303H2TU, and KSE13003H1ASTU are cross-manufacturer alternatives that maintain voltage and current ratings but operate at reduced maximum power dissipation (20 W versus 40 W). These parts are suitable for applications where the full 40 W power capability is not required. All three parts are ROHS3 compliant and REACH unaffected. FJE3303H1TU and FJE3303H2TU are manufactured by onsemi and Fairchild Semiconductor respectively and are in active production. KSE13003H1ASTU is manufactured by onsemi but carries a Last Time Buy status, indicating limited future availability.

Selection between FJE3303H1TU and FJE3303H2TU depends on DC current gain requirements: FJE3303H2TU provides higher minimum hFE (14 @ 500mA, 2V) compared to FJE3303H1TU (8 @ 500mA, 2V), offering improved base drive efficiency in switching applications.

Frequently Asked Questions (FAQ)

Q: Can ST13003-K be used as a direct replacement for ST13003?

A: Yes. ST13003-K is manufactured by STMicroelectronics with identical electrical specifications, operating temperature range, and compliance status. The only difference is packaging format. Both parts are ROHS3 compliant and suitable for direct substitution.

Q: What are the key differences between ST13003 and the FJE3303 series?

A: The primary difference is maximum power dissipation: ST13003 is rated for 40 W while FJE3303H1TU and FJE3303H2TU are rated for 20 W. Additionally, saturation voltage is higher in the FJE3303 series (3 V versus 1.5 V). Voltage and current ratings remain identical at 400 V and 1.5 A respectively. Both series maintain through-hole TO-126-3 packaging compatibility.

Q: Are all substitute parts RoHS compliant?

A: ST13003, ST13003-K, FJE3303H1TU, and KSE13003H1ASTU are ROHS3 compliant. FJE3303H2TU RoHS status is not specified in the provided data.

Q: What is the significance of KSE13003H1ASTU having a Last Time Buy status?

A: Last Time Buy status indicates that onsemi has announced end-of-life for this part. While 1769 units are currently in stock, future availability is limited. This part should be considered only when other alternatives are unavailable or when existing inventory must be depleted.

Q: Can I use FJE3303H2TU in place of FJE3303H1TU?

A: Both parts share identical voltage, current, power, and package specifications. FJE3303H2TU provides higher DC current gain (14 versus 8 @ 500mA, 2V), making it suitable for applications requiring improved base drive efficiency. Substitution is electrically valid.

Q: Are there any operating temperature differences between substitute parts?

A: All substitute parts operate across the same maximum junction temperature of 150°C. ST13003 and ST13003-K specify the full operating range of -40°C to 150°C, while FJE3303H1TU, FJE3303H2TU, and KSE13003H1ASTU specify only the maximum of 150°C.

Q: What packaging formats are available for these parts?

A: All parts are available in through-hole configuration with TO-225AA or TO-126-3 package compatibility. ST13003 is supplied in standard packaging, ST13003-K in bulk packaging, FJE3303H1TU in tube packaging, FJE3303H2TU in bulk packaging, and KSE13003H1ASTU in tube packaging.

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