2SA207900A Equivalent & Substitute Parts

Part Overview

The 2SA207900A is a Panasonic PNP bipolar junction transistor (BJT) rated for 45V collector-emitter breakdown voltage and 100mA maximum collector current. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for ongoing design support and procurement. The device is packaged in ML3-N2 surface mount configuration with a maximum power dissipation of 100mW and transition frequency of 80MHz.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Collector-Emitter Breakdown Voltage (Max)	45	V
Collector Current (Max)	100	mA
Power Dissipation (Max)	100	mW
Transition Frequency	80	MHz
Mounting Type	Surface Mount	—
Operating Temperature (Max)	125	°C
DC Current Gain (hFE Min)	180 @ 2mA, 10V	—
Vce Saturation (Max)	500mV @ 10mA, 100mA	—

Substitute Part Grouping Explanation

Substitution of the 2SA207900A is determined by the following critical parameters:

Primary Compatibility Criteria:

Transistor type must be PNP
Collector-emitter breakdown voltage must equal or exceed 45V
Maximum collector current must be 100mA or greater
Surface mount packaging required
Mounting type compatibility with ML3-N2 footprint

Secondary Compatibility Criteria:

Transition frequency of 80MHz or higher
Power dissipation capability of 100mW or greater
Operating temperature range supporting 125°C maximum junction temperature
Moisture sensitivity level MSL 1 (Unlimited)

Substitute parts are grouped into two categories: Direct Upgrades (active status, enhanced specifications) and Similar Alternatives (active status, equivalent or comparable specifications within allowed parameter ranges).

Parameter Comparison

Part Number	Manufacturer	Transistor Type	Vce Breakdown (V)	Ic Max (mA)	Power Max (mW)	Frequency (MHz)	Temp Max (°C)	Status	Package
2SA207900A	Panasonic	PNP	45	100	100	80	125	Obsolete	ML3-N2
2SA2154CT-GR,L3F	Toshiba	PNP	50	100	100	80	150	Active	CST3
BC857AM,315	Nexperia	PNP	45	100	150	100	150	Active	SOT-883
BC857AMB,315	Nexperia	PNP	45	100	250	100	150	Active	DFN1006B-3
BC857BLP-7	Diodes Inc.	PNP	45	100	250	100	150	Active	X1-DFN1006-3
BC857BLP-7B	Diodes Inc.	PNP	45	100	250	100	150	Active	X1-DFN1006-3
BC857BM,315	Nexperia	PNP	45	100	150	100	150	Active	SOT-883
BC857BMB,315	Nexperia	PNP	45	100	150	100	150	Active	DFN1006B-3
BC857CM,315	Nexperia	PNP	45	100	150	100	150	Active	SOT-883
BC857CMB,315	NXP	PNP	45	100	250	100	150	Active	DFN1006B-3

Engineering Selection Recommendations

Direct Upgrade Option:

The 2SA2154CT-GR,L3F (Toshiba) serves as a direct upgrade with enhanced voltage rating (50V versus 45V) while maintaining identical current and power specifications. This part is active status with RoHS3 compliance and extended operating temperature range to 150°C. The CST3 package provides mechanical compatibility with surface mount assembly processes.

Primary Substitute Options:

The BC857 series from Nexperia and Diodes Incorporated provides multiple active alternatives meeting or exceeding the 2SA207900A specifications. All BC857 variants maintain the 45V breakdown voltage and 100mA collector current rating. Key differentiators include:

BC857AM,315 and BC857BM,315: SOT-883 package with 150mW power rating and AEC-Q101 automotive qualification
BC857AMB,315, BC857BMB,315, and BC857CMB,315: DFN1006B-3 package with 250mW power rating and AEC-Q101 automotive qualification
BC857BLP-7 and BC857BLP-7B: X1-DFN1006-3 package with 250mW power rating and extended temperature range (-55°C to 150°C)
BC857CM,315: SOT-883 package with highest DC current gain (420 @ 2mA, 5V) and AEC-Q101 qualification

All BC857 variants are RoHS3 compliant and carry REACH Unaffected status. Operating temperature maximum of 150°C exceeds the original 2SA207900A specification of 125°C.

Inventory Availability:

The 2SA2154CT-GR,L3F offers highest inventory availability (25,146 units). BC857 series alternatives range from 7,856 to 179,840 units depending on specific variant and packaging configuration.

Frequently Asked Questions (FAQ)

Q: Can the 2SA207900A be directly replaced with any BC857 variant?

A: Yes, all BC857 variants listed meet the minimum electrical specifications of the 2SA207900A. The PNP transistor type, 45V breakdown voltage, 100mA collector current, and 80MHz transition frequency are maintained across all alternatives. Package differences (SOT-883 versus DFN1006B-3 versus X1-DFN1006-3) require PCB layout verification for mechanical compatibility.

Q: What is the difference between BC857AM,315 and BC857BM,315?

A: Both parts are identical in electrical specifications and package type (SOT-883). The designation difference reflects internal grading or manufacturing process variations within Nexperia's product line. Both are AEC-Q101 qualified and carry active product status.

Q: Does the 2SA2154CT-GR,L3F offer advantages over BC857 alternatives?

A: The 2SA2154CT-GR,L3F provides a 50V breakdown voltage rating compared to 45V for BC857 parts, offering additional voltage margin. However, BC857 variants provide higher power dissipation capability (150mW to 250mW versus 100mW) and extended temperature range options. Selection depends on specific circuit voltage and thermal requirements.

Q: Are all substitute parts RoHS3 compliant?

A: The 2SA2154CT-GR,L3F is explicitly RoHS3 compliant. All BC857 variants are RoHS3 compliant with REACH Unaffected status. The original 2SA207900A does not specify RoHS compliance due to obsolete status.

Q: What package considerations apply when substituting the ML3-N2?

A: The original ML3-N2 package is a Panasonic-specific surface mount configuration. Substitute parts use industry-standard packages: CST3 (Toshiba), SOT-883 (Nexperia), and DFN1006B-3 or X1-DFN1006-3 (Diodes/Nexperia). PCB footprint redesign is required for any package change. Verify land pattern compatibility with assembly equipment specifications.

Q: Which substitute offers the best thermal performance?

A: BC857 variants with DFN1006B-3 or X1-DFN1006-3 packages support 250mW power dissipation compared to 100mW for the original part and 150mW for SOT-883 variants. Enhanced thermal performance enables higher current or power applications within the 100mA collector current limit.

Q: Is automotive qualification required for my application?

A: AEC-Q101 qualification is available on BC857AM,315, BC857BM,315, BC857AMB,315, BC857BMB,315, BC857CM,315, and BC857CMB,315. If automotive-grade components are specified, these variants are appropriate selections. Non-automotive applications can utilize any listed substitute.

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