2SA812-M6-TP Equivalent & Substitute Parts

Part Overview

The 2SA812-M6-TP is a PNP bipolar junction transistor manufactured by Micro Commercial Co, designed for interface applications in surface mount configurations. This device operates at a maximum collector current of 100 mA with a collector-emitter breakdown voltage of 50 V and a transition frequency of 180 MHz. The component is rated for 200 mW maximum power dissipation and operates across a temperature range of -55°C to 150°C. The part is currently in active product status with 701 units in stock.

Substitute parts are necessary when the primary component becomes unavailable, when alternative packaging or compliance requirements are needed, or when design modifications require different electrical characteristics within acceptable operating parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Current - Collector (Ic) Max	100	mA
Voltage - Collector Emitter Breakdown (Max)	50	V
Vce Saturation (Max) @ Ib, Ic	300 mV @ 10 mA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	90 @ 1 mA, 6 V	—
Power - Max	200	mW
Frequency - Transition	180	MHz
Operating Temperature	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—

Substitute Part Grouping Explanation

Substitution of the 2SA812-M6-TP is determined by strict adherence to the following electrical and mechanical parameters:

Critical Substitution Parameters:

Transistor Type: Must be PNP
Current - Collector (Ic) Max: Must be ≥ 100 mA
Voltage - Collector Emitter Breakdown (Max): Must be ≥ 50 V
Mounting Type: Must be Surface Mount
Package / Case: Must be compatible with TO-236-3, SC-59, or SOT-23-3

Secondary Compatibility Parameters:

Operating Temperature Range: Must encompass or match -55°C to 150°C
Power Dissipation: Must be ≥ 200 mW
Vce Saturation characteristics must be suitable for the application
DC Current Gain (hFE) must support circuit design requirements

All substitute parts listed below meet the critical substitution parameters. Variations in transition frequency, DC current gain, and power dissipation are noted where they differ from the main part specification.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce Breakdown (Max) V	Power (Max) mW	Frequency MHz	hFE (Min)	Package	Product Status
2SA812-M6-TP	Micro Commercial Co	100	50	200	180	90	SOT-23	Active
BC857A RFG	Taiwan Semiconductor Corporation	100	45	200	100	125	SOT-23	Active
BC857ALT1G	onsemi	100	45	300	100	125	SOT-23-3	Active
BC857B RFG	Taiwan Semiconductor Corporation	100	45	200	100	220	SOT-23	Active
BC857B,215	Nexperia USA Inc.	100	45	250	100	220	TO-236AB	Active
BC857C RFG	Taiwan Semiconductor Corporation	100	45	200	100	420	SOT-23	Active
BC857CLT1G	onsemi	100	45	300	100	420	SOT-23-3	Active
BC860B,215	Nexperia USA Inc.	100	45	250	100	220	TO-236AB	Active
BCW70LT1G	onsemi	100	45	225	—	215	SOT-23-3	Active
BCX71HE6327HTSA1	Infineon Technologies	100	45	330	250	180	PG-SOT23	Last Time Buy
BCX71J,215	Nexperia USA Inc.	100	45	250	100	250	TO-236AB	Active

Engineering Selection Recommendations

Active Status Parts (Recommended for New Designs):

All substitute parts listed except BCX71HE6327HTSA1 maintain Active product status, ensuring long-term availability and continued manufacturing support. Parts manufactured by onsemi (BC857ALT1G, BC857CLT1G, BCW70LT1G) and Nexperia USA Inc. (BC857B,215, BC860B,215, BCX71J,215) carry ROHS3 compliance and AEC-Q101 automotive qualification where applicable, providing additional assurance for regulated applications.

Voltage Consideration:

The 2SA812-M6-TP operates at a maximum collector-emitter breakdown voltage of 50 V. All listed substitutes operate at 45 V maximum breakdown voltage. This represents a 5 V reduction in voltage rating. Substitution is acceptable only when circuit design ensures collector-emitter voltage does not exceed 45 V under all operating conditions.

Compliance and Certifications:

All substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the main part. Parts from Nexperia USA Inc. and onsemi include ROHS3 compliance. The BC857B,215, BC860B,215, and BCX71J,215 variants include AEC-Q101 automotive qualification, suitable for automotive-grade applications.

Packaging Variants:

Substitute parts are available in SOT-23, SOT-23-3 (TO-236), and TO-236AB packages. All are mechanically compatible with the original TO-236-3, SC-59, SOT-23-3 package specification. Tape & Reel (TR) and Cut Tape (CT) & Digi-Reel packaging options are available across manufacturers.

Last Time Buy Status:

BCX71HE6327HTSA1 carries Last Time Buy status, indicating discontinued manufacturing. This part should not be selected for new designs requiring long-term component availability.

Frequently Asked Questions (FAQ)

Q: Can the 2SA812-M6-TP be directly replaced with BC857A RFG?

A: Yes, BC857A RFG is electrically compatible for applications where the collector-emitter voltage does not exceed 45 V. Both devices share identical collector current (100 mA), operating temperature range (-55°C to 150°C), and surface mount SOT-23 packaging. The BC857A RFG operates at 100 MHz transition frequency compared to 180 MHz for the 2SA812-M6-TP, which is acceptable for lower-frequency applications.

Q: What is the primary difference between BC857B RFG and BC857C RFG?

A: The primary difference is DC Current Gain (hFE). BC857B RFG specifies a minimum hFE of 220 @ 2 mA, 5 V, while BC857C RFG specifies a minimum hFE of 420 @ 2 mA, 5 V. Both share identical voltage, current, and power ratings. Selection depends on circuit design requirements for current amplification.

Q: Are onsemi BC857ALT1G and BC857CLT1G suitable replacements?

A: Yes, both onsemi parts are suitable replacements. BC857ALT1G and BC857CLT1G offer increased power dissipation (300 mW versus 200 mW), ROHS3 compliance, and MSL 1 (Unlimited) moisture sensitivity rating. The primary difference between them is DC Current Gain: BC857ALT1G provides 125 hFE minimum, while BC857CLT1G provides 420 hFE minimum.

Q: Why do some substitute parts have lower voltage ratings (45 V vs. 50 V)?

A: The 2SA812-M6-TP is specified at 50 V collector-emitter breakdown voltage. Most substitute parts operate at 45 V. This 5 V difference is acceptable when circuit design ensures the collector-emitter voltage remains below 45 V under all operating conditions, including transient events and worst-case scenarios.

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

A: AEC-Q101 qualification indicates the part meets automotive industry reliability and quality standards. Parts such as BC857B,215, BC860B,215, and BCX71J,215 carry this qualification, making them suitable for automotive applications where component traceability and quality assurance are required.

Q: Can BCX71J,215 be used as a direct replacement despite higher transition frequency?

A: Yes, BCX71J,215 is compatible. It operates at 100 MHz transition frequency (compared to 180 MHz for the 2SA812-M6-TP) and provides higher DC Current Gain (250 hFE minimum). The higher transition frequency capability does not create incompatibility; it simply provides additional performance margin. The 45 V voltage rating limitation applies.

Q: What packaging options are available for substitutes?

A: Substitute parts are available in SOT-23, SOT-23-3 (TO-236), and TO-236AB packages. All are mechanically compatible with the original TO-236-3, SC-59, SOT-23-3 specification. Packaging availability varies by manufacturer and part number variant.

Q: Should BCX71HE6327HTSA1 be considered for new designs?

A: No. BCX71HE6327HTSA1 carries Last Time Buy status, indicating the manufacturer has discontinued or will discontinue production. This part should only be used for legacy system maintenance or repair where no alternative is available.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts carry ROHS3 compliance status. The main part 2SA812-M6-TP does not specify RoHS status in the provided data. All parts carry REACH Unaffected status and EAR99 ECCN classification.

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