MMBTA13 Equivalent & Substitute Parts

Part Overview

The MMBTA13 is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum collector current of 1.2 A and collector-emitter breakdown voltage of 30 V, with a maximum power dissipation of 350 mW. The MMBTA13 is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters while offering active product status and current availability.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) (Max)	1.2	A
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	—
Current - Collector Cutoff (Max)	100nA	ICBO
DC Current Gain (hFE) (Min) @ Ic, Vce	10000 @ 100mA, 5V	—
Power - Max	350	mW
Frequency - Transition	125	MHz
Operating Temperature	-55 to 150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBTA13 is determined by the following critical parameters: transistor type (NPN - Darlington), collector-emitter breakdown voltage (30 V maximum), surface mount package compatibility (SOT-23-3 or equivalent), and operating temperature range (-55°C to 150°C).

Substitute parts are grouped into two categories based on collector current rating:

Category A: Reduced Current Rating (300 mA maximum) Parts in this category operate at 300 mA maximum collector current, which is lower than the original MMBTA13 specification of 1.2 A. These parts are suitable for applications where the circuit design does not require the full 1.2 A current capability. All Category A substitutes maintain the 30 V breakdown voltage, SOT-23-3 package form factor, and equivalent saturation voltage characteristics.

Category B: Intermediate Current Rating (500 mA maximum) Parts in this category provide 500 mA maximum collector current, offering a middle ground between the original 1.2 A specification and the reduced 300 mA options. These parts maintain full voltage and package compatibility.

Substitution logic is based strictly on the following allowable parameters: maximum collector current equal to or greater than circuit requirements, collector-emitter breakdown voltage of 30 V or higher, identical or compatible package form factor, and operating temperature range encompassing the application requirements.

Parameter Comparison

Part Number	Manufacturer	Ic (Max)	Vce(br)max	Vce Sat @ Ib, Ic	hFE (Min) @ Ic, Vce	Power (Max)	Frequency	Temp Range	Package	Product Status
MMBTA13	onsemi	1.2 A	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	350 mW	125 MHz	-55 to 150°C	SOT-23-3	Obsolete
MMBTA13LT1G	onsemi	300 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA13LT3G	onsemi	300 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA14LT1G	onsemi	300 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
SMMBTA13LT1G	onsemi	300 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
2SD1383KT146B	Rohm Semiconductor	300 mA	32 V	1.5V @ 400µA, 200mA	5000 @ 100mA, 5V	200 mW	250 MHz	—	SOT-23-3	Active
2SD2142KT146	Rohm Semiconductor	300 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	200 mW	200 MHz	—	SOT-23-3	Active
MMBTA13-7-F	Diodes Incorporated	300 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	300 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA13-TP	Micro Commercial Co	300 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 150mA, 1V	225 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
MMBTA14-7-F	Diodes Incorporated	300 mA	30 V	1.5V @ 100µA, 100mA	20000 @ 100mA, 5V	300 mW	125 MHz	-55 to 150°C	SOT-23-3	Active
PMBTA13,215	Nexperia USA Inc.	500 mA	30 V	1.5V @ 100µA, 100mA	10000 @ 100mA, 5V	250 mW	125 MHz	—	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility)

For applications requiring the full 1.2 A collector current capability of the original MMBTA13, the PMBTA13,215 from Nexperia USA Inc. is the only substitute listed that provides 500 mA maximum collector current. This part maintains the 30 V breakdown voltage, SOT-23-3 package, and equivalent saturation voltage specifications. The PMBTA13,215 carries AEC-Q101 automotive qualification and ROHS3 compliance.

Secondary Substitutes (Reduced Current Applications)

For applications where collector current requirements do not exceed 300 mA, multiple active substitutes are available from onsemi, Diodes Incorporated, and Micro Commercial Co. These parts maintain full voltage and package compatibility with the original MMBTA13:

MMBTA13LT1G and MMBTA13LT3G (onsemi): Identical electrical specifications to the original part, available in Cut Tape and Tape & Reel packaging. Both are ROHS3 compliant and carry unlimited moisture sensitivity rating.
MMBTA13-7-F (Diodes Incorporated): Provides 300 mW maximum power dissipation (compared to 225 mW in onsemi variants) and carries AEC-Q101 automotive qualification.
MMBTA13-TP (Micro Commercial Co): Active product with equivalent specifications and full temperature range support.
MMBTA14LT1G and MMBTA14-7-F: Variants with higher DC current gain (hFE minimum of 20000 versus 10000), suitable for applications requiring enhanced gain characteristics.

Alternative Manufacturer Options

Rohm Semiconductor parts 2SD2142KT146 and 2SD1383KT146B provide 300 mA maximum collector current with 30 V and 32 V breakdown voltages respectively. The 2SD2142KT146 maintains identical saturation voltage and current gain specifications to the original MMBTA13. Both parts are ROHS3 compliant and carry unlimited moisture sensitivity rating.

Compliance and Availability

All recommended substitutes carry ROHS3 compliance and REACH Unaffected status, matching the regulatory profile of the original MMBTA13. Parts designated with AEC-Q101 qualification (MMBTA13-7-F, MMBTA14-7-F, PMBTA13,215) are suitable for automotive applications. Inventory availability ranges from 1,937 to 152,200 units across the substitute options.

Frequently Asked Questions (FAQ)

Q: Can I use a 300 mA rated substitute in place of the 1.2 A MMBTA13?

A: Only if your circuit design does not require collector current exceeding 300 mA. The 300 mA substitutes (MMBTA13LT1G, MMBTA13LT3G, MMBTA13-7-F, MMBTA13-TP, MMBTA14LT1G, MMBTA14-7-F, 2SD2142KT146, 2SD1383KT146B) are electrically compatible with the original part for applications within their current rating. For applications requiring the full 1.2 A capability, use PMBTA13,215 (500 mA) or verify that your circuit current requirements are met.

Q: What is the difference between MMBTA13LT1G and MMBTA13LT3G?

A: Both parts are manufactured by onsemi and have identical electrical specifications. The difference is in packaging: MMBTA13LT1G is supplied in Cut Tape (CT) & Digi-Reel® format, while MMBTA13LT3G is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly process requirements.

Q: Why do MMBTA14 variants have higher hFE than MMBTA13 variants?

A: MMBTA14 parts are specified with a minimum DC current gain (hFE) of 20000 at 100 mA and 5V, compared to 10000 for MMBTA13 parts. This higher gain characteristic makes MMBTA14 variants suitable for applications requiring enhanced amplification or switching speed. Both maintain identical voltage, current, and package specifications.

Q: Are the Rohm Semiconductor parts (2SD2142KT146, 2SD1383KT146B) direct replacements?

A: Both Rohm parts are functionally compatible substitutes for 300 mA applications. The 2SD2142KT146 maintains identical saturation voltage and current gain specifications to the original MMBTA13. The 2SD1383KT146B offers higher breakdown voltage (32 V versus 30 V) and higher transition frequency (250 MHz versus 125 MHz), making it suitable for higher-speed applications.

Q: What packaging options are available for substitutes?

A: All substitutes use the SOT-23-3 package form factor, maintaining mechanical compatibility with the original MMBTA13. Packaging formats vary by supplier: Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and TO-236AB. Select based on your assembly equipment and procurement process.

Q: Do all substitutes support the full -55°C to 150°C operating temperature range?

A: onsemi, Diodes Incorporated, and Micro Commercial Co substitutes specify the full -55°C to 150°C operating temperature range. Rohm Semiconductor and Nexperia parts specify only the maximum temperature (150°C) without a minimum temperature specification in the provided data. Verify temperature range requirements for your specific application.

Q: Which substitute offers the best power dissipation capability?

A: MMBTA13-7-F and MMBTA14-7-F (Diodes Incorporated) offer 300 mW maximum power dissipation, matching the original MMBTA13 specification. onsemi and Micro Commercial Co variants specify 225 mW, while Rohm and Nexperia parts specify 200 mW and 250 mW respectively. Select based on your thermal design requirements.

Q: Are automotive-qualified substitutes available?

A: Yes. MMBTA13-7-F, MMBTA14-7-F (Diodes Incorporated), and PMBTA13,215 (Nexperia) carry AEC-Q101 automotive qualification. These parts are suitable for automotive applications requiring formal qualification documentation.

Q: What is the difference between MMBTA13-TP and other onsemi variants?

A: MMBTA13-TP is manufactured by Micro Commercial Co (not onsemi) and is specified with hFE minimum of 10000 at 150 mA and 1V, compared to 10000 at 100 mA and 5V for onsemi variants. This represents a different measurement condition but equivalent gain performance. All other electrical and package specifications are identical.

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