MMBT4403-7 Equivalent & Substitute Parts

Part Overview

The MMBT4403-7 is a PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 40 V collector-emitter breakdown voltage and 600 mA maximum collector current. The device is packaged in SOT-23-3 (TO-236-3) surface mount configuration with 300 mW power dissipation capability and 200 MHz transition frequency. This part is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design support and procurement.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Max)	600	mA
Collector-Emitter Breakdown Voltage (Max)	40	V
Power Dissipation (Max)	300	mW
Transition Frequency	200	MHz
DC Current Gain (hFE Min)	100	@ 150 mA, 2 V
Vce Saturation (Max)	750 mV / 500 mV	@ 50 mA / 500 mA
Operating Temperature Range	-55 to 150	°C
Package Type	SOT-23-3	—
Grade	Automotive	—
Qualification	AEC-Q101	—

Substitute Part Grouping Explanation

Substitution of the MMBT4403-7 is determined by the following critical parameters: transistor type (PNP), collector current rating (600 mA minimum), collector-emitter breakdown voltage (40 V minimum), power dissipation (300 mW minimum), and surface mount package compatibility (SOT-23-3 or equivalent TO-236-3). The transition frequency of 200 MHz and DC current gain of 100 @ 150 mA, 2 V establish baseline performance characteristics.

Substitute parts are grouped into two categories:

Category 1: Direct Electrical and Package Equivalents — Parts meeting or exceeding all key electrical parameters with identical or compatible SOT-23-3 packaging. These include MMBT4403-7-F (Diodes Incorporated), SMMBT4403LT1G (onsemi), and MMST4403-7-F (Diodes Incorporated, SOT-323 package variant).

Category 2: Functional Alternatives with Parameter Derating — Parts with reduced collector current (500 mA), reduced power dissipation (250 mW), or reduced transition frequency (80-100 MHz) but maintaining 45 V collector-emitter breakdown voltage and automotive qualification. These include BC807 series variants (Nexperia USA Inc., onsemi) and 2PB709ASL,215 (Nexperia USA Inc.).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(BR) V	Power mW	fT MHz	hFE Min	Package	Status	RoHS
MMBT4403-7	Diodes Inc.	600	40	300	200	100	SOT-23-3	Discontinued	Non-compliant
MMBT4403-7-F	Diodes Inc.	600	40	300	200	100	SOT-23-3	Active	ROHS3
SMMBT4403LT1G	onsemi	600	40	300	200	100	SOT-23-3	Active	ROHS3
MMST4403-7-F	Diodes Inc.	600	40	200	200	100	SOT-323	Active	ROHS3
BC807-16LT1G	onsemi	500	45	300	100	100	SOT-23-3	Active	ROHS3
BC807-16LT3G	onsemi	500	45	300	100	100	SOT-23-3	Active	ROHS3
BC807-16,215	Nexperia	500	45	250	80	100	TO-236-3	Active	ROHS3
BC807-25,235	Nexperia	500	45	250	80	160	TO-236-3	Active	ROHS3
BC807,215	Nexperia	500	45	250	80	100	TO-236-3	Active	ROHS3
BC807-25,215	Nexperia	500	45	250	80	160	TO-236-3	Active	ROHS3
2PB709ASL,215	Nexperia	100	45	250	80	290	TO-236-3	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

MMBT4403-7-F and SMMBT4403LT1G are direct functional replacements for MMBT4403-7. Both parts maintain identical electrical specifications (600 mA collector current, 40 V breakdown voltage, 200 MHz transition frequency, 300 mW power dissipation) and are packaged in SOT-23-3 surface mount configuration. Both are active products with ROHS3 compliance and AEC-Q101 automotive qualification. MMBT4403-7-F is manufactured by Diodes Incorporated (original manufacturer) and SMMBT4403LT1G is manufactured by onsemi. Selection between these two depends on supply chain availability and preferred supplier qualification.

Secondary Substitute (Reduced Power Dissipation)

MMST4403-7-F is manufactured by Diodes Incorporated and maintains all electrical parameters of the original part except power dissipation is reduced to 200 mW. The package is SOT-323 (smaller than SOT-23-3), which may require PCB layout modification. This part is suitable for applications where the 200 mW power budget is sufficient and board space is constrained.

Functional Alternatives (Reduced Current Rating)

BC807-16LT1G and BC807-16LT3G (onsemi) provide 500 mA collector current (versus 600 mA), 45 V breakdown voltage (versus 40 V), and 300 mW power dissipation in SOT-23-3 package. Transition frequency is 100 MHz (versus 200 MHz). These parts are suitable for applications where the 500 mA current limit and 100 MHz frequency are acceptable. Both are active products with ROHS3 compliance.

Functional Alternatives (Reduced Power and Frequency)

BC807 series variants from Nexperia (BC807,215; BC807-16,215; BC807-25,215; BC807-25,215) provide 500 mA collector current, 45 V breakdown voltage, but reduced power dissipation (250 mW) and transition frequency (80 MHz). These parts are packaged in TO-236-3 (compatible with SOT-23-3 footprint) and carry AEC-Q101 automotive qualification. Selection among BC807 variants depends on DC current gain requirements (100 or 160 @ 100 mA, 1 V).

Limited Applicability

2PB709ASL,215 (Nexperia) is not recommended as a general substitute due to significantly reduced collector current (100 mA versus 600 mA), which restricts its use to low-current applications only.

Frequently Asked Questions (FAQ)

Q: Can MMBT4403-7-F be used as a direct replacement for MMBT4403-7?

A: Yes. MMBT4403-7-F is electrically and mechanically identical to MMBT4403-7, with the same 600 mA collector current, 40 V breakdown voltage, 200 MHz transition frequency, and SOT-23-3 package. The primary difference is product status (active versus discontinued) and RoHS compliance (ROHS3 versus non-compliant).

Q: What is the difference between MMBT4403-7-F and SMMBT4403LT1G?

A: Both parts are electrical equivalents with identical specifications. MMBT4403-7-F is manufactured by Diodes Incorporated; SMMBT4403LT1G is manufactured by onsemi. Both are packaged in SOT-23-3 and carry ROHS3 compliance. Selection depends on supplier availability and qualification requirements.

Q: Can BC807-16LT1G replace MMBT4403-7 in all applications?

A: BC807-16LT1G is a functional alternative with reduced collector current (500 mA versus 600 mA) and reduced transition frequency (100 MHz versus 200 MHz). It is suitable for applications where these reduced ratings are acceptable. The 45 V breakdown voltage exceeds the original 40 V specification, providing additional margin. Verify that your application does not require the full 600 mA current or 200 MHz frequency before substitution.

Q: Why is MMST4403-7-F packaged in SOT-323 instead of SOT-23-3?

A: SOT-323 is a smaller surface mount package than SOT-23-3. MMST4403-7-F uses this smaller package while maintaining the same electrical performance except for reduced power dissipation (200 mW versus 300 mW). PCB layout modification is required if substituting MMST4403-7-F for MMBT4403-7-F.

Q: Are all substitute parts automotive qualified?

A: MMBT4403-7-F, SMMBT4403LT1G, MMST4403-7-F, BC807 series (all variants), and 2PB709ASL,215 carry AEC-Q101 automotive qualification. All substitute parts are ROHS3 compliant.

Q: What is the minimum collector current I should use to ensure proper operation with BC807 variants?

A: BC807 variants are rated for 500 mA maximum collector current. Design your circuit to operate within this limit. The DC current gain (hFE) is specified at 100 mA, 1 V for most BC807 variants, indicating reliable operation at this current level and above (up to 500 mA maximum).

Q: Can I use 2PB709ASL,215 as a substitute?

A: 2PB709ASL,215 is not recommended as a general substitute due to its 100 mA maximum collector current, which is significantly lower than the original 600 mA specification. This part is suitable only for low-current applications where the 100 mA limit is acceptable.

Q: What packaging considerations should I account for when substituting?

A: MMBT4403-7, MMBT4403-7-F, SMMBT4403LT1G, BC807-16LT1G, and BC807-16LT3G all use SOT-23-3 (TO-236-3) packaging and are pin-compatible. MMST4403-7-F uses SOT-323 packaging, which requires PCB footprint modification. BC807 variants from Nexperia use TO-236-3 packaging, which is compatible with SOT-23-3 footprints. Verify PCB layout compatibility before final substitution.

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