MMBT4403K Equivalent & Substitute Parts

Part Overview

The MMBT4403K is a PNP 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 600 mA, collector-emitter breakdown voltage of 40 V, and maximum power dissipation of 350 mW. The MMBT4403K is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design requirements and procurement needs.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	600	mA
Voltage - Collector Emitter Breakdown (Max)	40	V
Vce Saturation (Max) @ Ib, Ic	750mV @ 50mA, 500mA	—
DC Current Gain (hFE) Min @ Ic, Vce	100 @ 150mA, 2V	—
Power - Max	350	mW
Frequency - Transition	200	MHz
Operating Temperature Range	-55 to 150	°C
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBT4403K is determined by strict electrical and mechanical parameter matching within the PNP bipolar transistor category. The following criteria establish substitution validity:

Primary Substitution Criteria:

Transistor Type: PNP
Current - Collector (Ic) Max: 600 mA minimum
Voltage - Collector Emitter Breakdown (Max): 40 V minimum
DC Current Gain (hFE) Min @ Ic, Vce: 100 @ 150mA, 2V minimum
Frequency - Transition: 200 MHz minimum
Operating Temperature Range: -55°C to 150°C minimum
Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount

Direct Equivalents are onsemi MMBT4403 variants with identical base product numbers and electrical specifications, differing only in packaging format (Cut Tape, Tape & Reel) or product status transitions.

Cross-Manufacturer Equivalents from Diodes Incorporated, Nexperia USA Inc., and Micro Commercial Co maintain identical electrical parameters and package specifications while offering active product status and compliance certifications.

Similar Parts from Rohm Semiconductor (2SB1197KT146Q, 2SB1197KT146R) provide functional equivalence with modified electrical parameters within acceptable design margins, including higher collector current capability (800 mA) and lower collector-emitter breakdown voltage (32 V).

Parameter Comparison

Part Number	Manufacturer	Ic Max (mA)	Vce Breakdown (V)	Power Max (mW)	hFE Min @ Ic, Vce	Frequency (MHz)	Product Status	Package
MMBT4403K	onsemi	600	40	350	100 @ 150mA, 2V	200	Obsolete	SOT-23-3
MMBT4403LT1G	onsemi	600	40	300	100 @ 150mA, 2V	200	Active	SOT-23-3
MMBT4403LT3G	onsemi	600	40	300	100 @ 150mA, 2V	200	Active	SOT-23-3
SMMBT4403LT1G	onsemi	600	40	300	100 @ 150mA, 2V	200	Active	SOT-23-3
MMBT4403-7-F	Diodes Incorporated	600	40	300	100 @ 150mA, 2V	200	Active	SOT-23-3
MMBT4403-G	Comchip Technology	600	40	300	100 @ 150mA, 2V	200	Active	SOT-23-3
MMBT4403-TP	Micro Commercial Co	600	40	350	100 @ 150mA, 2V	200	Active	SOT-23-3
PMBT4403,215	Nexperia USA Inc.	600	40	250	100 @ 150mA, 2V	200	Active	SOT-23-3
PMBT4403Z	Nexperia USA Inc.	600	40	250	100 @ 150mA, 2V	200	Active	SOT-23-3
2SB1197KT146Q	Rohm Semiconductor	800	32	200	120 @ 100mA, 3V	200	Active	SOT-23-3
2SB1197KT146R	Rohm Semiconductor	800	32	200	180 @ 100mA, 3V	200	Active	SOT-23-3

Engineering Selection Recommendations

Direct Replacement (Preferred): MMBT4403LT1G, MMBT4403LT3G, and SMMBT4403LT1G from onsemi are direct functional equivalents with active product status. These parts maintain identical electrical specifications to the MMBT4403K with the exception of reduced maximum power dissipation (300 mW versus 350 mW). Selection between these variants depends on packaging requirements: MMBT4403LT1G and SMMBT4403LT1G are available in Cut Tape format, while MMBT4403LT3G is supplied in Tape & Reel format. All three variants are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating.

Cross-Manufacturer Equivalents: MMBT4403-7-F (Diodes Incorporated), MMBT4403-G (Comchip Technology), MMBT4403-TP (Micro Commercial Co), PMBT4403,215, and PMBT4403Z (Nexperia USA Inc.) provide electrical equivalence with active product status. MMBT4403-7-F carries AEC-Q101 automotive qualification. PMBT4403,215 and PMBT4403Z are AEC-Q101 qualified automotive-grade components with reduced maximum power dissipation (250 mW). All cross-manufacturer options maintain SOT-23-3 package compatibility and ROHS3 compliance.

Alternative Functional Equivalents: 2SB1197KT146Q and 2SB1197KT146R from Rohm Semiconductor provide functional substitution with modified electrical parameters. These parts support higher collector current (800 mA) and exhibit lower collector-emitter breakdown voltage (32 V). Selection of these alternatives is appropriate when design margins accommodate the reduced voltage rating and when the increased current capability provides system benefit.

Frequently Asked Questions (FAQ)

Q: Can MMBT4403LT1G directly replace MMBT4403K in existing designs?

A: Yes. MMBT4403LT1G maintains identical electrical specifications for collector current (600 mA), collector-emitter breakdown voltage (40 V), DC current gain (100 @ 150mA, 2V), and transition frequency (200 MHz). The primary difference is reduced maximum power dissipation (300 mW versus 350 mW). Designs operating within 300 mW power budget experience no functional impact. Designs requiring the full 350 mW capability should select MMBT4403-TP from Micro Commercial Co.

Q: What is the difference between MMBT4403LT1G and MMBT4403LT3G?

A: Both parts are onsemi MMBT4403 variants with identical electrical specifications. The difference is packaging format: MMBT4403LT1G is supplied in Cut Tape (CT) & Digi-Reel® format with 824,300 pieces in stock, while MMBT4403LT3G is supplied in Tape & Reel (TR) format with 46,872 pieces in stock. Selection depends on assembly line requirements and inventory availability.

Q: Are Nexperia PMBT4403,215 and PMBT4403Z suitable replacements?

A: Yes, with design consideration. Both Nexperia parts maintain electrical equivalence for collector current, breakdown voltage, and DC current gain. Maximum power dissipation is reduced to 250 mW compared to the MMBT4403K specification of 350 mW. Both parts carry AEC-Q101 automotive qualification and are ROHS3 compliant. Selection is appropriate for designs operating within 250 mW power budget or for automotive applications requiring AEC-Q101 certification.

Q: Can Rohm 2SB1197KT146Q or 2SB1197KT146R replace MMBT4403K?

A: These parts provide functional equivalence with modified electrical parameters. Collector current capability is higher (800 mA versus 600 mA), but collector-emitter breakdown voltage is lower (32 V versus 40 V). DC current gain specifications differ: 2SB1197KT146Q specifies 120 @ 100mA, 3V while 2SB1197KT146R specifies 180 @ 100mA, 3V. Selection is appropriate when design margins accommodate the reduced voltage rating and when increased current capability provides system benefit.

Q: What packaging options are available for MMBT4403 equivalents?

A: All substitute parts maintain SOT-23-3 (TO-236-3, SC-59) surface mount package compatibility with MMBT4403K. Packaging format variations include Cut Tape (CT) & Digi-Reel®, Tape & Reel (TR), and supplier-specific formats. Package selection does not affect electrical performance and depends on assembly line equipment and procurement requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All active substitute parts listed carry ROHS3 compliance certification. The obsolete MMBT4403K does not specify ROHS status. All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity level, indicating no special moisture handling requirements during storage or assembly.

Q: Which substitute part offers the highest inventory availability?

A: MMBT4403LT1G from onsemi offers the highest inventory availability with 824,300 pieces in stock. MMBT4403LT3G provides 46,872 pieces, SMMBT4403LT1G provides 54,500 pieces, and PMBT4403Z provides 30,398 pieces. Inventory levels should be verified with suppliers for current availability.

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