MMST4403-7 PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MMST4403-7 is an active PNP bipolar junction transistor manufactured by Diodes Incorporated, rated for 40V collector-emitter breakdown voltage and 0.6A maximum collector current. This surface mount device in SC-70 packaging is designed for general-purpose switching and amplification applications. The part is ROHS3 compliant with unlimited moisture sensitivity level (MSL 1) and carries EAR99 export classification.

Equivalent and substitute parts are identified based on matching or exceeding the electrical specifications and mechanical compatibility of the original device. Substitutes are categorized by their relationship to the main part: direct equivalents share identical base product numbers and electrical ratings, while similar alternatives provide compatible performance within specified parameter ranges.

Key Parameters

Parameter	MMST4403-7
Transistor Type	PNP
Voltage - Collector Emitter Breakdown (Max)	40 V
Current - Collector (Ic) (Max)	0.6 A
Power - Max	200 mW
Frequency - Transition	200 MHz
DC Current Gain (hFE) (Min) @ Ic, Vce	100 @ 150mA, 2V
Operating Temperature Range	-55°C to 150°C (TJ)
Package / Case	SC-70, SOT-323
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution logic for the MMST4403-7 is based on the following critical parameters:

Electrical Compatibility Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must be ≥40V
Maximum collector current must be ≥0.6A
Power dissipation must be ≥200mW
Transition frequency must be ≥200MHz
DC current gain (hFE) minimum must be ≥100

Mechanical Compatibility Criteria:

Package type must be SC-70 or SOT-323 (surface mount)
Mounting type must be surface mount
Pin configuration must be compatible with SOT-323 footprint

Compliance Criteria:

RoHS3 compliance required
MSL rating of 1 (unlimited) preferred
Active product status required

Parts are grouped into three categories:

Direct Equivalents: Parts sharing the MMST4403 base product number with identical electrical specifications and SC-70/SOT-323 packaging. These include MMST4403-7-F (Diodes Incorporated, Tape & Reel packaging) and MMST4403-TP (Micro Commercial Co, Tape & Reel packaging).

Upgrade Equivalents: Parts meeting or exceeding all electrical parameters with enhanced certifications. PMST4403,115 (Nexperia USA Inc.) qualifies as an upgrade with AEC-Q101 automotive qualification and lower collector cutoff current specification.

Similar Alternatives: Parts with compatible electrical performance within specified ranges but differing in secondary parameters such as package size, power rating, or frequency response. These include CMPT4403 TR PBFREE (Central Semiconductor Corp, SOT-23 package with higher power rating), 2PB709ARW,115 (NXP USA Inc., lower collector current rating), and BC807 series variants (Nexperia USA Inc., higher voltage rating with automotive qualification).

Parameter Comparison

Parameter	MMST4403-7	MMST4403-7-F	MMST4403-TP	PMST4403,115	CMPT4403 TR PBFREE	2PB709ARW,115	BC807-16W,115	BC807-25W,115	BC807-40W,115
Manufacturer	Diodes Inc.	Diodes Inc.	Micro Commercial Co	Nexperia USA Inc.	Central Semiconductor	NXP USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.	Nexperia USA Inc.
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	40 V	40 V	40 V	40 V	40 V	45 V	45 V	45 V	45 V
Current - Collector (Ic) (Max)	0.6 A	0.6 A	0.6 A	0.6 A	0.6 A	0.1 A	0.5 A	0.5 A	0.5 A
Power - Max	200 mW	200 mW	200 mW	200 mW	350 mW	200 mW	200 mW	200 mW	200 mW
Frequency - Transition	200 MHz	200 MHz	200 MHz	200 MHz	200 MHz	70 MHz	80 MHz	80 MHz	80 MHz
DC Current Gain (hFE) (Min)	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 150mA, 2V	100 @ 10mA, 1V	210 @ 2mA, 10V	100 @ 100mA, 1V	160 @ 100mA, 1V	250 @ 100mA, 1V
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C	150°C	150°C	150°C	150°C
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	TO-236-3, SOT-23	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323	SC-70, SOT-323
RoHS Status	ROHS3	ROHS3	ROHS3	ROHS3	ROHS3	Not specified	ROHS3	ROHS3	ROHS3
Moisture Sensitivity Level	1	1	1	1	1	Not specified	1	1	1
Automotive Grade	No	No	No	Yes (AEC-Q101)	No	Yes (AEC-Q101)	Yes (AEC-Q101)	Yes (AEC-Q101)	Yes (AEC-Q101)

Engineering Selection Recommendations

Direct Substitution (Pin-Compatible, Identical Electrical Performance):

MMST4403-7-F and MMST4403-TP are direct substitutes for MMST4403-7. Both maintain the MMST4403 base product number, identical electrical specifications (40V, 0.6A, 200MHz, 200mW), and SC-70/SOT-323 packaging. The primary difference is packaging format: MMST4403-7-F is supplied in Tape & Reel format with 71,300 units in stock, while MMST4403-TP is also Tape & Reel with 11,013 units in stock. Both are ROHS3 compliant with MSL 1 rating and active product status.

Upgrade Substitution (Enhanced Specifications and Certifications):

PMST4403,115 (Nexperia USA Inc.) qualifies as an upgrade equivalent. It maintains all electrical specifications of the MMST4403-7 (40V, 0.6A, 200MHz, 200mW) while adding AEC-Q101 automotive qualification. The part features lower collector cutoff current (50nA ICBO versus unspecified for MMST4403-7) and is supplied in Tape & Reel format with 6,825 units in stock. ROHS3 compliance and MSL 1 rating are maintained.

Alternative Substitution (Compatible Performance, Different Package or Specifications):

CMPT4403 TR PBFREE (Central Semiconductor Corp) provides compatible electrical performance with a larger SOT-23 package offering higher power dissipation (350mW versus 200mW). This alternative is suitable for applications requiring increased thermal headroom while maintaining 40V, 0.6A, and 200MHz specifications. ROHS3 compliance and MSL 1 rating apply.

BC807 series variants (BC807-16W,115, BC807-25W,115, BC807-40W,115) from Nexperia USA Inc. offer higher voltage rating (45V versus 40V) with AEC-Q101 automotive qualification. These parts feature reduced collector current (0.5A versus 0.6A) and lower transition frequency (80MHz versus 200MHz). DC current gain varies by suffix: BC807-16W has 100 hFE minimum, BC807-25W has 160 hFE minimum, and BC807-40W has 250 hFE minimum. All maintain 200mW power rating and SC-70/SOT-323 packaging.

2PB709ARW,115 (NXP USA Inc.) is a lower-performance alternative with reduced collector current (0.1A versus 0.6A) and transition frequency (70MHz versus 200MHz). This part is suitable only for applications with lower current requirements and is included for reference due to its AEC-Q101 automotive qualification and SC-70/SOT-323 packaging.

Selection Criteria Summary:

For direct replacement with identical specifications: MMST4403-7-F or MMST4403-TP
For automotive-grade applications: PMST4403,115 or BC807 series
For increased power dissipation: CMPT4403 TR PBFREE
For higher voltage margin: BC807 series (45V rating)

All recommended substitutes maintain ROHS3 compliance, surface mount SC-70/SOT-323 packaging, and active product status.

Frequently Asked Questions (FAQ)

Q: Can MMST4403-7-F be used as a direct replacement for MMST4403-7?

A: Yes. MMST4403-7-F is a direct equivalent with identical electrical specifications (40V, 0.6A, 200MHz, 200mW), DC current gain (100 hFE minimum), and SC-70/SOT-323 packaging. The only difference is packaging format (Tape & Reel versus Cut Tape & Digi-Reel). Both are ROHS3 compliant with MSL 1 rating and active product status.

Q: What is the difference between MMST4403-TP and MMST4403-7-F?

A: Both are direct equivalents to MMST4403-7 with identical electrical specifications and SC-70/SOT-323 packaging. MMST4403-TP is manufactured by Micro Commercial Co, while MMST4403-7-F is manufactured by Diodes Incorporated. MMST4403-TP specifies lower Vce saturation (400mV @ 15mA, 150mA versus 750mV @ 50mA, 500mA) and includes collector cutoff current specification (100nA). Both are ROHS3 compliant with MSL 1 rating.

Q: Is PMST4403,115 a suitable replacement for MMST4403-7?

A: Yes. PMST4403,115 maintains all electrical specifications of MMST4403-7 (40V, 0.6A, 200MHz, 200mW) and is pin-compatible in SC-70/SOT-323 packaging. The primary advantage is AEC-Q101 automotive qualification and lower collector cutoff current (50nA ICBO). ROHS3 compliance and MSL 1 rating are maintained. This part is suitable for applications requiring automotive-grade components.

Q: Can BC807-40W,115 replace MMST4403-7?

A: BC807-40W,115 is a compatible alternative with important differences. It provides higher voltage rating (45V versus 40V) and AEC-Q101 automotive qualification. However, collector current is reduced to 0.5A (versus 0.6A), and transition frequency is lower at 80MHz (versus 200MHz). DC current gain is higher at 250 hFE minimum. This part is suitable for applications with lower current requirements and higher voltage margins. Pin configuration and SC-70/SOT-323 packaging are compatible.

Q: What is the difference between BC807-16W, BC807-25W, and BC807-40W?

A: All three BC807 variants share identical electrical specifications (45V, 0.5A, 80MHz, 200mW) and SC-70/SOT-323 packaging with AEC-Q101 automotive qualification. The suffix designates DC current gain: BC807-16W has 100 hFE minimum, BC807-25W has 160 hFE minimum, and BC807-40W has 250 hFE minimum. Selection depends on required current gain for the application.

Q: Is CMPT4403 TR PBFREE suitable for MMST4403-7 replacement?

A: CMPT4403 TR PBFREE is a compatible alternative with the same electrical specifications (40V, 0.6A, 200MHz) but in a larger SOT-23 package instead of SC-70/SOT-323. The primary advantage is higher power dissipation rating (350mW versus 200mW), providing increased thermal capability. This part is suitable for applications requiring higher power handling or where PCB layout accommodates the larger package. Pin configuration differs due to package type.

Q: Why would I choose 2PB709ARW,115 over MMST4403-7?

A: 2PB709ARW,115 is not recommended as a direct replacement due to significantly reduced electrical specifications: collector current is limited to 0.1A (versus 0.6A) and transition frequency is 70MHz (versus 200MHz). This part is suitable only for low-current applications. The primary advantage is AEC-Q101 automotive qualification and SC-70/SOT-323 packaging compatibility. Selection should be based on application current requirements.

Q: Are all substitute parts ROHS3 compliant?

A: MMST4403-7-F, MMST4403-TP, PMST4403,115, CMPT4403 TR PBFREE, BC807-16W,115, BC807-25W,115, and BC807-40W,115 are all ROHS3 compliant. 2PB709ARW,115 and BC807-25W,135 do not specify RoHS status in the provided data. Compliance verification is required for these parts if ROHS3 certification is mandatory for the application.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates the component has unlimited shelf life and does not require special moisture control during storage or handling. All primary substitute parts (MMST4403-7-F, MMST4403-TP, PMST4403,115, CMPT4403 TR PBFREE, BC807 series) carry MSL 1 rating, eliminating moisture sensitivity concerns for standard manufacturing environments.

Q: Can I use BC807-40W,115 in a circuit designed for MMST4403-7 without modification?

A: BC807-40W,115 is pin-compatible in SC-70/SOT-323 packaging and can be used as a direct pin replacement. However, circuit performance may differ due to reduced collector current (0.5A versus 0.6A) and lower transition frequency (80MHz versus 200MHz). Applications operating near maximum current or frequency specifications may require circuit analysis to confirm compatibility. Higher voltage rating (45V) provides additional safety margin.

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