MSD601-ST1G Equivalent & Substitute Parts

Part Overview

The MSD601-ST1G is an NPN bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 100 mA maximum collector current in a surface mount SC-59 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The MSD601-ST1G serves general-purpose small-signal switching and amplification applications requiring low-power NPN transistor functionality. Obsolescence status necessitates identification of active alternative components with compatible electrical and mechanical specifications.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	50	V
Current - Collector (Ic) (Max)	100	mA
Power - Max	200	mW
Vce Saturation (Max) @ Ib, Ic	500mV @ 10mA, 100mA	—
DC Current Gain (hFE) (Min) @ Ic, Vce	290 @ 2mA, 10V	—
Current - Collector Cutoff (Max)	100	nA
Operating Temperature (Max)	150	°C (TJ)
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MSD601-ST1G is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor Type: NPN
Voltage - Collector Emitter Breakdown (Max): ≥ 50 V
Current - Collector (Ic) (Max): ≥ 100 mA
Power - Max: ≥ 200 mW
DC Current Gain (hFE) (Min) @ Ic, Vce: ≥ 290 @ 2mA, 10V (preferred)
Vce Saturation (Max) @ Ib, Ic: ≤ 500mV @ 10mA, 100mA (preferred)

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, or SOT-23-3
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Product Status Consideration:

Active status preferred for long-term availability

Substitute parts are grouped into two categories: direct equivalents from onsemi with identical electrical specifications, and cross-manufacturer alternatives meeting or exceeding the electrical and mechanical requirements.

Parameter Comparison

Part Number	Manufacturer	Voltage - Collector Emitter Breakdown (Max)	Current - Collector (Ic) (Max)	Power - Max	Vce Saturation (Max) @ Ib, Ic	DC Current Gain (hFE) (Min) @ Ic, Vce	Package	Product Status	Mounting Type
MSD601-ST1G	onsemi	50 V	100 mA	200 mW	500mV @ 10mA, 100mA	290 @ 2mA, 10V	SC-59	Obsolete	Surface Mount
MSD601-RT1G	onsemi	50 V	100 mA	200 mW	500mV @ 10mA, 100mA	210 @ 2mA, 10V	SC-59	Active	Surface Mount
2PD601ASL,215	Nexperia USA Inc.	50 V	100 mA	250 mW	250mV @ 10mA, 100mA	290 @ 2mA, 10V	TO-236AB	Active	Surface Mount
2SC1623-L6-TP	Micro Commercial Co	50 V	100 mA	200 mW	300mV @ 10mA, 100mA	—	SOT-23	Active	Surface Mount
BC847A RFG	Taiwan Semiconductor Corporation	45 V	100 mA	200 mW	500mV @ 5mA, 100mA	110 @ 2mA, 5V	SOT-23	Active	Surface Mount
2PD601ARL,215	Nexperia USA Inc.	50 V	100 mA	250 mW	250mV @ 10mA, 100mA	210 @ 2mA, 10V	TO-236AB	Active	Surface Mount
2PD601ART,215	Nexperia USA Inc.	50 V	100 mA	250 mW	250mV @ 10mA, 100mA	210 @ 2mA, 10V	TO-236AB	Active	Surface Mount
2PD601ART,235	Nexperia USA Inc.	50 V	100 mA	250 mW	250mV @ 10mA, 100mA	210 @ 2mA, 10V	TO-236AB	Active	Surface Mount
2PD601BSL,215	NXP Semiconductors	50 V	200 mA	250 mW	250mV @ 10mA, 100mA	290 @ 2mA, 10V	TO-236AB	Active	Surface Mount
BC847B-TP	Micro Commercial Co	45 V	100 mA	225 mW	500mV @ 5mA, 100mA	200 @ 2mA, 5V	SOT-23	Active	Surface Mount

Engineering Selection Recommendations

Primary Substitute: MSD601-RT1G

The MSD601-RT1G is the direct onsemi equivalent with active product status. This part maintains identical electrical specifications and packaging to the obsolete MSD601-ST1G, with the exception of DC current gain minimum (210 vs. 290 @ 2mA, 10V). The difference in hFE minimum does not affect functional compatibility in general-purpose switching applications. This part is available in high volume (16,401 pcs in stock).

Secondary Substitutes: 2PD601 Series (Nexperia USA Inc.)

The 2PD601ASL,215, 2PD601ARL,215, 2PD601ART,215, and 2PD601ART,235 parts are automotive-grade alternatives with AEC-Q101 qualification. These parts meet or exceed the electrical requirements of the MSD601-ST1G with improved power dissipation (250 mW vs. 200 mW) and lower saturation voltage (250mV vs. 500mV @ 10mA, 100mA). All are packaged in TO-236AB and carry active product status with RoHS3 compliance.

Alternative Substitute: 2PD601BSL,215

The 2PD601BSL,215 from NXP Semiconductors provides higher collector current capability (200 mA vs. 100 mA) while maintaining 50 V breakdown voltage and 250 mW power rating. This part is suitable for applications requiring increased current headroom. AEC-Q101 qualified and RoHS3 compliant.

Conditional Substitutes: BC847A RFG and BC847B-TP

The BC847A RFG and BC847B-TP are general-purpose alternatives with reduced collector-emitter breakdown voltage (45 V vs. 50 V). These parts are suitable only for applications where the 50 V rating is not a critical design requirement. Both are active, RoHS3 compliant, and available in high volume.

Conditional Substitute: 2SC1623-L6-TP

The 2SC1623-L6-TP from Micro Commercial Co meets the 50 V and 100 mA requirements with active status. DC current gain specification is not provided in the available data. This part is suitable for applications where hFE specification is not critical.

Frequently Asked Questions (FAQ)

Q: Can MSD601-RT1G directly replace MSD601-ST1G?

A: Yes. The MSD601-RT1G is the active equivalent from onsemi with identical electrical specifications and packaging. The DC current gain minimum is lower (210 vs. 290 @ 2mA, 10V), but this does not affect functional compatibility in standard switching applications.

Q: What is the difference between SC-59 and SOT-23 packages?

A: SC-59 and SOT-23 are equivalent package designations for the TO-236-3 form factor. Both refer to the same three-lead surface mount package with identical pin spacing and dimensions. Parts specified as SC-59, SOT-23, or TO-236-3 are mechanically interchangeable.

Q: Are the 2PD601 series parts suitable replacements?

A: Yes. The 2PD601ASL,215, 2PD601ARL,215, 2PD601ART,215, and 2PD601ART,235 parts meet or exceed all electrical requirements of the MSD601-ST1G. These parts offer improved specifications including lower saturation voltage and higher power rating. All are automotive-grade with AEC-Q101 qualification and active product status.

Q: Why do some substitute parts have higher power ratings?

A: Higher power ratings (250 mW vs. 200 mW) indicate improved thermal performance and design margin. These parts are fully compatible with applications designed for the MSD601-ST1G and provide additional operational headroom.

Q: Can BC847 series parts replace the MSD601-ST1G?

A: BC847 series parts are functional alternatives for applications where the 50 V collector-emitter breakdown voltage is not a critical requirement. The BC847A RFG and BC847B-TP are rated for 45 V maximum, which is lower than the MSD601-ST1G specification. Use these parts only when circuit design permits operation at reduced voltage ratings.

Q: What is the significance of AEC-Q101 qualification?

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. Parts with this qualification (2PD601 series) are suitable for automotive and high-reliability applications. Non-qualified parts are suitable for general industrial and consumer applications.

Q: Are all substitute parts RoHS3 compliant?

A: All substitute parts listed carry RoHS3 compliance status, meeting current environmental and regulatory requirements for lead-free manufacturing.

Q: What packaging options are available?

A: All substitute parts are available in surface mount packages: SC-59, SOT-23, or TO-236AB. These designations refer to the same three-lead form factor and are mechanically interchangeable on PCB layouts designed for TO-236-3 packages.

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