MMBT6515 Equivalent & Substitute Parts

Part Overview

The MMBT6515 is an obsolete NPN bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This small-signal transistor operates at a maximum collector voltage of 25 V with a collector current rating of 200 mA and maximum power dissipation of 350 mW. Due to its obsolete product status, equivalent and substitute parts are necessary for ongoing design support, production continuity, and component sourcing.

Key Parameters

Parameter	Value
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	25 V
Current - Collector (Ic) (Max)	200 mA
Power - Max	350 mW
Vce Saturation (Max) @ Ib, Ic	500mV @ 5mA, 50mA
DC Current Gain (hFE) (Min) @ Ic, Vce	250 @ 2mA, 10V
Current - Collector Cutoff (Max)	50nA (ICBO)
Operating Temperature	-55°C ~ 150°C (TJ)
Package / Case	SOT-23-3 (TO-236-3, SC-59)
Mounting Type	Surface Mount
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the MMBT6515 is determined by strict compatibility across the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN (required match)
Package / Case: SOT-23-3 surface mount (required match)
Voltage - Collector Emitter Breakdown (Max): Must equal or exceed 25 V
Current - Collector (Ic) (Max): Must equal or exceed 200 mA
Operating Temperature Range: Must encompass -55°C ~ 150°C (TJ)

Secondary Compatibility Factors:

Vce Saturation characteristics at specified bias conditions
DC Current Gain (hFE) performance envelope
Power dissipation capability
Collector cutoff current (ICBO)

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (25 V, 200 mA): Parts that maintain the exact voltage and current ratings of the MMBT6515, ensuring drop-in compatibility for applications with these specific requirements.

Category B - Functional Alternatives (Modified Ratings): Parts that operate within the same package but feature different voltage or current ratings. These are suitable only when the application can tolerate the modified electrical specifications.

Parameter Comparison

Part Number	Manufacturer	Product Status	Ic (Max)	Vce Breakdown (Max)	Power (Max)	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Package	RoHS Status
MMBT6515	onsemi	Obsolete	200 mA	25 V	350 mW	500mV @ 5mA, 50mA	250 @ 2mA, 10V	SOT-23-3	Not Specified
MMBT4124LT1G	onsemi	Active	200 mA	25 V	225 mW	300mV @ 5mA, 50mA	120 @ 2mA, 1V	SOT-23-3	ROHS3 Compliant
MMBT5089LT1G	onsemi	Active	50 mA	25 V	300 mW	500mV @ 1mA, 10mA	400 @ 100µA, 5V	SOT-23-3	ROHS3 Compliant
MMBT6429LT1G	onsemi	Active	200 mA	45 V	225 mW	600mV @ 5mA, 100mA	500 @ 100µA, 5V	SOT-23-3	ROHS3 Compliant
MMBT6521LT1G	onsemi	Active	100 mA	25 V	225 mW	500mV @ 5mA, 50mA	300 @ 2mA, 10V	SOT-23-3	ROHS3 Compliant
SMMBT5088LT1G	onsemi	Active	50 mA	30 V	300 mW	500mV @ 1mA, 10mA	300 @ 100µA, 5V	SOT-23-3	ROHS3 Compliant
SMMBT6521LT1G	onsemi	Active	100 mA	25 V	225 mW	500mV @ 5mA, 50mA	300 @ 2mA, 10V	SOT-23-3	ROHS3 Compliant
2PD601BSL,215	NXP Semiconductors	Active	200 mA	50 V	250 mW	250mV @ 10mA, 100mA	290 @ 2mA, 10V	SOT-23-3	Not Specified

Engineering Selection Recommendations

Category A - Direct Electrical Equivalents:

MMBT4124LT1G is the primary active substitute for the MMBT6515. Both parts share identical voltage (25 V) and current (200 mA) ratings with the same SOT-23-3 package. The MMBT4124LT1G features improved saturation voltage (300 mV versus 500 mV) and includes ROHS3 compliance certification. This part is suitable for direct replacement in applications where the MMBT6515 was originally specified.

MMBT6429LT1G provides equivalent current handling (200 mA) in the same package with enhanced voltage rating (45 V versus 25 V). This part is appropriate for applications requiring higher voltage headroom while maintaining the same current capacity. ROHS3 compliance is certified.

Category B - Functional Alternatives:

MMBT6521LT1G and SMMBT6521LT1G operate at reduced collector current (100 mA versus 200 mA) but maintain the 25 V voltage rating and SOT-23-3 package. These parts are suitable for applications where collector current does not exceed 100 mA. Both variants are ROHS3 compliant and active products. The SMMBT6521LT1G variant is electrically identical to MMBT6521LT1G.

MMBT5089LT1G and SMMBT5088LT1G are low-current alternatives rated at 50 mA maximum collector current. These parts are appropriate only for applications with collector current requirements below 50 mA. SMMBT5088LT1G provides a 30 V voltage rating versus the standard 25 V.

Cross-Manufacturer Alternative:

2PD601BSL,215 (NXP Semiconductors) provides equivalent current (200 mA) and package (SOT-23-3) with enhanced voltage rating (50 V). This part includes AEC-Q101 automotive qualification and is suitable for applications requiring automotive-grade components or higher voltage operation.

All recommended substitutes are active products with current manufacturing status and ROHS3 compliance, ensuring long-term availability and regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can MMBT4124LT1G be used as a direct replacement for MMBT6515?

A: Yes. Both parts share identical voltage (25 V) and current (200 mA) ratings, operate across the same temperature range (-55°C to 150°C), and use the SOT-23-3 package. The MMBT4124LT1G is an active product with ROHS3 compliance, making it suitable for direct substitution.

Q: What is the difference between MMBT6521LT1G and SMMBT6521LT1G?

A: Both parts are electrically identical with 100 mA collector current rating and 25 V voltage rating in SOT-23-3 package. The primary difference is packaging format: MMBT6521LT1G is supplied in Tape & Reel, while SMMBT6521LT1G is also supplied in Tape & Reel. Both are ROHS3 compliant active products.

Q: Can I use MMBT5089LT1G in place of MMBT6515?

A: No. MMBT5089LT1G is rated for maximum 50 mA collector current, while MMBT6515 is rated for 200 mA. This part is suitable only for applications where collector current does not exceed 50 mA. Using this part in a 200 mA application will result in device failure.

Q: Why does MMBT6429LT1G have a higher voltage rating (45 V) than MMBT6515 (25 V)?

A: MMBT6429LT1G is designed for applications requiring higher voltage operation. The 45 V rating provides additional voltage headroom for circuits operating above 25 V. This part maintains the same 200 mA current rating and SOT-23-3 package, making it suitable for higher-voltage applications while preserving current-handling capability.

Q: Is the 2PD601BSL,215 from NXP Semiconductors compatible with MMBT6515?

A: Yes, for applications requiring equivalent current (200 mA) and package (SOT-23-3). The 2PD601BSL,215 provides higher voltage rating (50 V) and includes AEC-Q101 automotive qualification. This part is suitable for automotive applications or designs requiring higher voltage operation.

Q: What does ROHS3 compliance mean for these substitute parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting the use of specific hazardous materials in electrical and electronic equipment. All active substitute parts listed are ROHS3 compliant, ensuring regulatory compliance for new designs.

Q: Can I use MMBT6521LT1G in a circuit designed for MMBT6515?

A: Only if the application circuit can operate with reduced collector current (100 mA maximum versus 200 mA). The 25 V voltage rating, SOT-23-3 package, and operating temperature range are identical. Verify that the circuit does not require collector current exceeding 100 mA before substitution.

Q: Why is MMBT6515 listed as obsolete?

A: The MMBT6515 has been discontinued by onsemi. Active substitute parts are available to support existing designs and provide alternatives for new applications. Using active products ensures long-term component availability and manufacturing support.

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