STN690A NPN Bipolar Transistor Equivalent & Substitute Parts

Part Overview

The STN690A is an NPN bipolar junction transistor manufactured by STMicroelectronics, rated for 30V collector-emitter breakdown voltage and 3A maximum collector current in a surface mount SOT-223 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The STN690A delivers 1.6W maximum power dissipation with a 100MHz transition frequency, suitable for general-purpose switching and amplification applications in compact form factors.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Collector-Emitter Breakdown Voltage (Max)	30	V
Collector Current (Max)	3	A
Power Dissipation (Max)	1.6	W
Transition Frequency	100	MHz
Package Type	SOT-223	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the STN690A is determined by the following critical parameters: NPN transistor type, collector-emitter breakdown voltage rating, maximum collector current capability, power dissipation rating, transition frequency, SOT-223 surface mount package compatibility, and regulatory compliance status (RoHS3 and REACH).

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

Category 1: Direct Electrical Equivalents — Parts matching or exceeding the 30V/3A rating with comparable or superior performance characteristics and active product status.

Category 2: Voltage-Enhanced Alternatives — Parts with higher voltage ratings (40V or 60V) that maintain 3A collector current capability, providing design margin for applications with voltage transients.

Category 3: Current-Limited Alternatives — Parts with reduced collector current ratings (1A) that maintain the 30V voltage rating, suitable for lower-current applications.

All substitute parts maintain SOT-223 package compatibility, surface mount mounting type, RoHS3 compliance, and unlimited moisture sensitivity level (MSL 1).

Parameter Comparison

Parameter	STN690A	DJT4031N-13	FZT489TA	FZT651TA	FZT849TA
Manufacturer	STMicroelectronics	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated	Diodes Incorporated
Product Status	Obsolete	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN
Vce Breakdown (Max)	30 V	40 V	30 V	60 V	30 V
Ic (Max)	3 A	3 A	1 A	3 A	7 A
Power (Max)	1.6 W	1.2 W	2 W	2 W	3 W
Frequency - Transition	100 MHz	105 MHz	150 MHz	175 MHz	100 MHz
Vce Saturation (Max)	400 mV @ 100mA, 3A	300 mV @ 300mA, 3A	600 mV @ 200mA, 2A	600 mV @ 300mA, 3A	350 mV @ 300mA, 6.5A
DC Current Gain (hFE Min)	100 @ 500mA, 2V	200 @ 1A, 1V	100 @ 1A, 2V	100 @ 500mA, 2V	100 @ 1A, 1V
Package / Case	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA	TO-261-4, TO-261AA
Supplier Device Package	SOT-223	SOT-223-3	SOT-223-3	SOT-223-3	SOT-223-3
Operating Temperature	150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)	-55°C ~ 150°C (TJ)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

DJT4031N-13 — This Diodes Incorporated part provides direct electrical substitution with enhanced voltage rating (40V versus 30V), maintaining 3A collector current and comparable transition frequency (105MHz). The active product status ensures long-term availability. The higher voltage rating provides additional design margin for transient protection. Vce saturation is improved at 300mV, and DC current gain is doubled (200 minimum), supporting lower base drive requirements.

FZT489TA — This part maintains the 30V voltage rating and SOT-223 package but reduces collector current to 1A maximum. Selection is appropriate for applications requiring lower current handling with enhanced power dissipation capability (2W) and higher transition frequency (150MHz). This part is suitable only when circuit current requirements do not exceed 1A.

FZT651TA — This part provides the highest voltage rating (60V) while maintaining 3A collector current capability and SOT-223 package compatibility. Maximum power dissipation is 2W with transition frequency of 175MHz. This part is selected for applications requiring enhanced voltage margin or operation in higher-voltage environments. Packaging is supplied in Cut Tape format rather than Tape & Reel.

FZT849TA — This part exceeds the original 3A specification with 7A maximum collector current while maintaining 30V voltage rating and SOT-223 package. Power dissipation is 3W with 100MHz transition frequency matching the original part. Vce saturation is improved at 350mV. This part is selected for applications requiring higher current capability without voltage rating changes.

All substitute parts maintain RoHS3 compliance, REACH unaffected status, and unlimited moisture sensitivity level, ensuring regulatory and environmental compatibility with the original STN690A.

Frequently Asked Questions (FAQ)

Q: Can the DJT4031N-13 directly replace the STN690A in all applications?

A: The DJT4031N-13 is electrically compatible for applications operating at or below 30V. The 40V rating provides additional voltage margin. Collector current (3A) and transition frequency (105MHz) are comparable. Pin configuration and SOT-223 package are identical. Verification of circuit board layout and thermal management is required due to the 1.2W power rating versus the original 1.6W.

Q: What is the primary difference between FZT489TA and the original STN690A?

A: The FZT489TA is rated for 1A maximum collector current compared to the STN690A's 3A rating. This part is suitable only for circuits designed for 1A or lower current operation. Voltage rating (30V) and package (SOT-223) are identical. Power dissipation (2W) and transition frequency (150MHz) are superior.

Q: Why would FZT651TA be selected over other substitutes?

A: The FZT651TA provides the highest voltage rating (60V) among available substitutes, offering maximum design margin for voltage transients and overvoltage conditions. It maintains 3A collector current and SOT-223 package compatibility. This part is selected for applications in higher-voltage environments or where voltage transient protection is critical.

Q: Is the FZT849TA suitable for direct replacement in all STN690A applications?

A: The FZT849TA exceeds the original 3A specification with 7A maximum collector current. It maintains 30V voltage rating and SOT-223 package. This part is suitable for applications where higher current capability is beneficial or required. No circuit modifications are necessary for current-limited applications.

Q: Are all substitute parts available in the same packaging format as the STN690A?

A: DJT4031N-13, FZT489TA, and FZT849TA are supplied in Tape & Reel (TR) format matching the original STN690A. FZT651TA is supplied in Cut Tape (CT) format. All parts use SOT-223-3 supplier device package designation, compatible with SOT-223 board layouts.

Q: What is the operating temperature range difference between the STN690A and substitute parts?

A: The STN690A specifies maximum junction temperature of 150°C without a minimum operating temperature. All substitute parts specify -55°C to 150°C operating temperature range, providing extended low-temperature operation capability. This does not affect applications within the original 0°C to 150°C range.

Q: Do all substitute parts meet the same regulatory compliance as the STN690A?

A: All substitute parts are RoHS3 compliant and REACH unaffected, matching the original STN690A compliance status. Moisture sensitivity level is 1 (Unlimited) for all parts. ECCN and HTSUS classifications are identical across all parts.

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