MMBT4403-G PNP Bipolar Junction Transistor Equivalent & Substitute Parts

Part Overview

The MMBT4403-G is an active-status PNP bipolar junction transistor manufactured by Comchip Technology, designed for general-purpose switching and amplification applications in surface-mount configurations. This device operates at 40 V collector-emitter breakdown voltage with a maximum collector current of 600 mA and 300 mW power dissipation. The part is packaged in SOT-23-3 (TO-236-3) format and is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1).

Equivalent and substitute parts are necessary when the primary part becomes unavailable, when alternative manufacturers offer improved lead times or inventory levels, or when design requirements permit operation within the specified electrical and mechanical parameter ranges of functionally equivalent devices.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector Current (Ic) Maximum	600	mA
Collector-Emitter Breakdown Voltage (Vceo)	40	V
Vce Saturation (Max) @ Ib, Ic	400 mV @ 15 mA, 150 mA	—
DC Current Gain (hFE) Minimum @ Ic, Vce	100 @ 150 mA, 2 V	—
Power Dissipation Maximum	300	mW
Transition Frequency	200	MHz
Operating Temperature Range	−55 to +150	°C
Package Type	SOT-23-3 (TO-236-3, SC-59)	—
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBT4403-G is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Transistor type must be PNP
Collector current rating must be ≥ 600 mA
Collector-emitter breakdown voltage must be ≥ 40 V
DC current gain (hFE) minimum must be ≥ 100 at specified test conditions
Transition frequency must be ≥ 200 MHz
Operating temperature range must encompass −55°C to +150°C
Package must be SOT-23-3 (TO-236-3) or equivalent surface-mount variant
RoHS3 compliance required
MSL rating must be 1 (Unlimited)

Secondary Considerations:

Vce saturation characteristics may vary within acceptable limits for switching applications
Power dissipation rating of 300 mW or higher is acceptable
Collector cutoff current variations are acceptable provided they do not exceed specified maximum ratings

Parts are grouped into two categories: Direct Equivalents (identical electrical specifications and package designation) and Manufacturer-Recommended Alternatives (functionally compatible with minor parameter variations that remain within application tolerance).

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vceo (Max) V	hFE (Min) @ Ic, Vce	Power (Max) mW	Freq (MHz)	Temp Range °C	Package	Compliance
MMBT4403-G	Comchip Technology	600	40	100 @ 150 mA, 2 V	300	200	−55 to +150	SOT-23-3	ROHS3
MMBT4403-7-F	Diodes Incorporated	600	40	100 @ 150 mA, 2 V	300	200	−55 to +150	SOT-23-3	ROHS3 / AEC-Q101
MMBT4403-TP	Micro Commercial Co	600	40	100 @ 150 mA, 2 V	350	200	−55 to +150	SOT-23-3	ROHS3
MMBT4403LT1G	onsemi	600	40	100 @ 150 mA, 2 V	300	200	−55 to +150	SOT-23-3	ROHS3
MMBT4403LT3G	onsemi	600	40	100 @ 150 mA, 2 V	300	200	−55 to +150	SOT-23-3	ROHS3
PMBT4403,215	Nexperia USA Inc.	600	40	100 @ 150 mA, 2 V	250	200	−55 to +150	TO-236AB	ROHS3 / AEC-Q101
PMBT4403Z	Nexperia USA Inc.	600	40	100 @ 150 mA, 2 V	250	200	−55 to +150	TO-236AB	ROHS3 / AEC-Q101
SMMBT4403LT1G	onsemi	600	40	100 @ 150 mA, 2 V	300	200	−55 to +150	SOT-23-3	ROHS3
2SB1197KT146Q	Rohm Semiconductor	800	32	120 @ 100 mA, 3 V	200	200	−55 to +150	SMT3	ROHS3
2SB1197KT146R	Rohm Semiconductor	800	32	180 @ 100 mA, 3 V	200	200	−55 to +150	SMT3	ROHS3

Engineering Selection Recommendations

Direct Equivalents (Preferred for Pin-Compatible Replacement):

The following parts maintain identical electrical specifications and package designation to the MMBT4403-G and are suitable for direct substitution without circuit modification:

MMBT4403LT1G (onsemi): Identical specifications, Cut Tape & Digi-Reel packaging, high inventory availability (824,300 pcs)
MMBT4403LT3G (onsemi): Identical specifications, Tape & Reel packaging, active status
MMBT4403-TP (Micro Commercial Co): Identical specifications with 350 mW power rating (exceeds minimum requirement), active status
MMBT4403-7-F (Diodes Incorporated): Identical specifications with AEC-Q101 automotive qualification, active status

Automotive-Grade Alternatives (AEC-Q101 Qualified):

For applications requiring automotive-grade components:

PMBT4403,215 (Nexperia USA Inc.): AEC-Q101 qualified, 250 mW power rating, TO-236AB package variant, active status
PMBT4403Z (Nexperia USA Inc.): AEC-Q101 qualified, 250 mW power rating, TO-236AB package variant, active status

Functional Alternatives (Parameter Derating Required):

The following parts operate within the MMBT4403-G application envelope but with reduced voltage rating (32 V vs. 40 V):

2SB1197KT146Q (Rohm Semiconductor): 800 mA collector current (exceeds requirement), 32 V Vceo (below 40 V specification), 200 mW power rating, SMT3 package
2SB1197KT146R (Rohm Semiconductor): 800 mA collector current (exceeds requirement), 32 V Vceo (below 40 V specification), 200 mW power rating, SMT3 package

All recommended parts maintain RoHS3 compliance, MSL 1 rating, and active product status. Selection should prioritize inventory availability and lead-time requirements balanced against application voltage and power constraints.

Frequently Asked Questions (FAQ)

Q: Can MMBT4403LT1G replace MMBT4403-G in all applications?

A: Yes. MMBT4403LT1G maintains identical electrical specifications (600 mA Ic, 40 V Vceo, 100 MHz hFE minimum, 300 mW power, 200 MHz transition frequency) and operates across the same temperature range (−55°C to +150°C). Both are packaged in SOT-23-3 and are RoHS3 compliant with MSL 1 rating. The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) and manufacturer (onsemi vs. Comchip Technology).

Q: What is the difference between PMBT4403,215 and PMBT4403Z?

A: Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications: 600 mA Ic, 40 V Vceo, 100 mA hFE minimum, 250 mW power, and 200 MHz transition frequency. Both are AEC-Q101 qualified and packaged in TO-236AB. The designations represent different manufacturing batches or internal revision levels but are functionally equivalent for substitution purposes.

Q: Can 2SB1197KT146Q be used as a direct replacement for MMBT4403-G?

A: No. While 2SB1197KT146Q is a PNP transistor with 200 MHz transition frequency and operates across −55°C to +150°C, it has a reduced collector-emitter breakdown voltage of 32 V (vs. 40 V required) and lower power dissipation of 200 mW (vs. 300 mW). This part is suitable only for applications where the circuit operates below 32 V and power dissipation does not exceed 200 mW. The higher collector current rating (800 mA) does not compensate for the voltage derating.

Q: Are MMBT4403-TP and MMBT4403LT3G interchangeable?

A: Yes, with one consideration. Both parts are PNP transistors with 600 mA Ic, 40 V Vceo, 100 mA hFE minimum, 200 MHz transition frequency, and −55°C to +150°C operating range. MMBT4403-TP offers 350 mW power dissipation (exceeding the 300 mW minimum), while MMBT4403LT3G is rated at 300 mW. Both are packaged in SOT-23-3 and are RoHS3 compliant. Selection depends on inventory availability and packaging preference (Tape & Reel for both).

Q: What does AEC-Q101 qualification mean for automotive applications?

A: AEC-Q101 is an automotive electronics council qualification standard for discrete semiconductors. Parts bearing this qualification (MMBT4403-7-F, PMBT4403,215, PMBT4403Z) have undergone additional reliability testing and are approved for use in automotive environments. If your application requires automotive-grade components, select from these AEC-Q101 qualified alternatives.

Q: Can I use SMMBT4403LT1G as a substitute?

A: Yes. SMMBT4403LT1G is manufactured by onsemi and maintains identical specifications to MMBT4403-G: 600 mA Ic, 40 V Vceo, 100 mA hFE minimum, 300 mW power, 200 MHz transition frequency, −55°C to +150°C operating range, SOT-23-3 package, RoHS3 compliance, and MSL 1 rating. The "S" prefix indicates a screened or selected grade variant, which may offer tighter parameter tolerances.

Q: What is the significance of the package designation TO-236AB vs. SOT-23-3?

A: TO-236AB and SOT-23-3 are equivalent package designations for the same physical form factor. Both refer to a three-lead surface-mount package with identical pin spacing and dimensions. Parts designated as either TO-236AB (Nexperia) or SOT-23-3 (other manufacturers) are mechanically and electrically interchangeable on the PCB. The different naming reflects manufacturer nomenclature conventions rather than physical differences.

Q: Is there a performance difference between Comchip Technology MMBT4403-G and onsemi MMBT4403LT1G?

A: No performance difference exists in the specified electrical parameters. Both devices meet identical ratings for collector current (600 mA), breakdown voltage (40 V), current gain (100 minimum), power dissipation (300 mW), and transition frequency (200 MHz). Differences are limited to manufacturer identity, packaging format, and inventory availability. Selection should be based on supply chain requirements and lead-time constraints.

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