MMBTA14LT1HTSA1 Equivalent & Substitute Parts

Part Overview

The MMBTA14LT1HTSA1 is an NPN Darlington bipolar junction transistor manufactured by Infineon Technologies, designed for surface mount applications in the SOT-23-3 package. This device is rated for 30 V collector-emitter breakdown voltage and 300 mA maximum collector current, with a transition frequency of 125 MHz and maximum power dissipation of 330 mW.

The MMBTA14LT1HTSA1 is currently discontinued at DiGi Electronics. Equivalent and substitute parts are available from multiple manufacturers including onsemi, Diodes Incorporated, Rohm Semiconductor, and Nexperia USA Inc., all offering active product status with comparable electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN - Darlington	—
Current - Collector (Ic) Max	300	mA
Voltage - Collector Emitter Breakdown (Max)	30	V
Vce Saturation (Max) @ Ib, Ic	1.5V @ 100µA, 100mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	20000 @ 100mA, 5V	—
Power - Max	330	mW
Frequency - Transition	125	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the MMBTA14LT1HTSA1 are classified based on strict electrical and mechanical parameter compatibility. The primary substitution criteria are:

Critical Parameters for Substitution:

Transistor Type: NPN - Darlington configuration
Voltage Rating: 30 V collector-emitter breakdown voltage
Current Rating: 300 mA maximum collector current
Package: SOT-23-3 / TO-236-3 surface mount form factor
Saturation Voltage: 1.5V @ 100µA, 100mA
Collector Cutoff Current: 100 nA maximum

Substitute Categories:

Category 1: Direct Electrical Equivalents (300 mA, 30 V, SOT-23-3) Parts meeting all critical parameters with identical or superior power ratings and transition frequencies. These include MMBTA14-7-F (Diodes Incorporated), MMBTA14LT1G (onsemi), SMMBTA14LT1G (onsemi), and SMMBTA14LT3G (onsemi).

Category 2: Enhanced Performance Substitutes (Higher Current or Frequency) Parts exceeding the original specifications in collector current or transition frequency while maintaining 30 V voltage rating and SOT-23-3 package. BCV27 (onsemi) provides 1.2 A collector current and 220 MHz transition frequency. BCV27,215 (Nexperia USA Inc.) provides 500 mA collector current and 220 MHz transition frequency.

Category 3: Related Darlington Transistors (Lower hFE) Parts with identical voltage and current ratings but lower DC current gain specifications. MMBTA13-7-F (Diodes Incorporated), MMBTA13-TP (Micro Commercial Co), and MMBTA13LT1G (onsemi) feature 10000 hFE minimum versus 20000 hFE for the original part.

Category 4: Manufacturer-Recommended Alternative (Different Package) 2SD2142KT146 (Rohm Semiconductor) provides 30 V, 300 mA ratings in SMT3 package with 200 MHz transition frequency and 10000 hFE minimum.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat @ 100µA, 100mA V	hFE Min @ 100mA, 5V	Power Max mW	Freq MHz	Temp Range °C	Package	Status
MMBTA14LT1HTSA1	Infineon	300	30	1.5	20000	330	125	0 to 150	SOT-23-3	Discontinued
MMBTA14-7-F	Diodes Inc.	300	30	1.5	20000	300	125	-55 to 150	SOT-23-3	Active
MMBTA14LT1G	onsemi	300	30	1.5	20000	225	125	-55 to 150	SOT-23-3	Active
SMMBTA14LT1G	onsemi	300	30	1.5	20000	225	125	-55 to 150	SOT-23-3	Active
SMMBTA14LT3G	onsemi	300	30	1.5	20000	225	125	-55 to 150	SOT-23-3	Active
2SD2142KT146	Rohm Semi.	300	30	1.5	10000	200	200	0 to 150	SMT3	Active
BCV27	onsemi	1200	30	1.0	20000	350	220	-55 to 150	SOT-23-3	Active
BCV27,215	Nexperia	500	30	1.0	20000	250	220	0 to 150	TO-236AB	Active
MMBTA13-7-F	Diodes Inc.	300	30	1.5	10000	300	125	-55 to 150	SOT-23-3	Active
MMBTA13-TP	Micro Comm.	300	30	1.5	10000	225	125	-55 to 150	SOT-23	Active
MMBTA13LT1G	onsemi	300	30	1.5	10000	225	125	-55 to 150	SOT-23-3	Active

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

MMBTA14-7-F (Diodes Incorporated) and MMBTA14LT1G (onsemi) are direct substitutes meeting all electrical specifications of the MMBTA14LT1HTSA1. Both are active products with ROHS3 compliance and MSL 1 rating. MMBTA14-7-F includes AEC-Q101 automotive qualification. MMBTA14LT1G and SMMBTA14LT1G offer extended operating temperature range (-55°C to 150°C) compared to the original part (0°C to 150°C).

For Applications Requiring Extended Temperature Range:

MMBTA14LT1G, SMMBTA14LT1G, SMMBTA14LT3G, MMBTA13-7-F, MMBTA13-TP, and MMBTA13LT1G all provide -55°C to 150°C operating temperature range, suitable for industrial and automotive environments.

For Applications Requiring Higher Current Capacity:

BCV27 (onsemi) provides 1.2 A maximum collector current with 220 MHz transition frequency, suitable for applications requiring higher current handling while maintaining 30 V voltage rating and SOT-23-3 package compatibility. BCV27,215 (Nexperia USA Inc.) provides 500 mA collector current with AEC-Q101 automotive qualification.

For Automotive Applications:

MMBTA14-7-F (Diodes Incorporated) and BCV27,215 (Nexperia USA Inc.) carry AEC-Q101 qualification. MMBTA14-7-F maintains identical electrical specifications to the original part with automotive-grade certification.

For Lower DC Current Gain Applications:

MMBTA13 series parts (MMBTA13-7-F, MMBTA13-TP, MMBTA13LT1G) feature 10000 hFE minimum versus 20000 hFE for MMBTA14 series, suitable for applications where lower gain is acceptable or preferred.

Frequently Asked Questions (FAQ)

Q: Can MMBTA14-7-F directly replace MMBTA14LT1HTSA1 in existing designs?

A: Yes. MMBTA14-7-F meets all critical electrical parameters: 300 mA collector current, 30 V breakdown voltage, 1.5V saturation voltage at specified conditions, 20000 hFE minimum, and SOT-23-3 package. Both devices are ROHS3 compliant with MSL 1 rating. The primary difference is product status: MMBTA14LT1HTSA1 is discontinued while MMBTA14-7-F is active.

Q: What is the difference between MMBTA14 and MMBTA13 series?

A: Both series share identical voltage (30 V), current (300 mA), saturation voltage (1.5V @ 100µA, 100mA), and package specifications. The primary difference is DC current gain: MMBTA14 series specifies 20000 hFE minimum at 100 mA, 5V, while MMBTA13 series specifies 10000 hFE minimum. MMBTA13 parts are suitable for applications where lower gain is acceptable.

Q: Why do some substitutes have lower power ratings (225 mW vs 330 mW)?

A: Power rating differences reflect manufacturer design variations while maintaining identical electrical performance at rated conditions. MMBTA14LT1G, SMMBTA14LT1G, SMMBTA14LT3G, and MMBTA13-TP specify 225 mW maximum power dissipation versus 330 mW for the original part. These parts remain suitable for applications within their power rating specifications.

Q: Can BCV27 be used as a substitute for MMBTA14LT1HTSA1?

A: BCV27 is a compatible substitute for applications requiring higher current capacity. It maintains 30 V voltage rating and SOT-23-3 package but provides 1.2 A maximum collector current (versus 300 mA) and 220 MHz transition frequency (versus 125 MHz). BCV27 is suitable for designs where higher current handling is beneficial or required.

Q: What is the significance of the operating temperature range difference?

A: The original MMBTA14LT1HTSA1 specifies 0°C to 150°C operating range. Substitute parts MMBTA14LT1G, SMMBTA14LT1G, SMMBTA14LT3G, MMBTA13-7-F, MMBTA13-TP, and MMBTA13LT1G extend this to -55°C to 150°C. Extended range parts are suitable for industrial, automotive, and temperature-critical applications. Parts with 0°C to 150°C range (2SD2142KT146, BCV27,215) match the original temperature specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts carry ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original MMBTA14LT1HTSA1 specifications.

Q: What packaging options are available for substitutes?

A: Most substitutes use SOT-23-3 package (also designated TO-236-3 or SC-59). MMBTA13-TP uses SOT-23 package. 2SD2142KT146 uses SMT3 package. BCV27,215 uses TO-236AB package. All maintain surface mount compatibility with the original part's SOT-23-3 footprint, except where noted.

Q: Which substitute offers the best inventory availability?

A: MMBTA13LT1G (onsemi) shows 152,200 pieces in stock, followed by MMBTA14LT1G (onsemi) with 125,300 pieces. BCV27 (onsemi) has 107,836 pieces available. All listed substitutes maintain active product status with substantial inventory levels.

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