MSA1162YT1 Equivalent & Substitute Parts

Part Overview

The MSA1162YT1 is a PNP bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 100 mA maximum collector current. This device is packaged in SC-59 (SOT-23-3) surface mount configuration and is designed for general-purpose switching and amplification applications requiring 200 mW power dissipation capability.

The MSA1162YT1 is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Active alternatives with comparable electrical characteristics and identical packaging compatibility are available from multiple manufacturers.

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	500 mV @ 10 mA, 100 mA	—
Current - Collector Cutoff (Max)	100	nA
DC Current Gain (hFE) Min @ Ic, Vce	120 @ 2 mA, 6 V	—
Power - Max	200	mW
Frequency - Transition	80	MHz
Operating Temperature (TJ)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MSA1162YT1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Transistor type must be PNP
Collector current rating must be ≥100 mA
Collector-emitter breakdown voltage must be ≥50 V (or ≥45 V for applications not requiring full 50 V margin)
Maximum power dissipation must be ≥200 mW
DC current gain (hFE) must support circuit biasing requirements
Transition frequency must be adequate for circuit switching speed

Mechanical Compatibility Requirements:

Package must be surface mount in TO-236-3, SC-59, or SOT-23-3 configuration
Moisture sensitivity level must be ≤1 (MSL-1)
Pin configuration must match three-terminal PNP layout

Compliance Considerations:

Active product status preferred for new designs
RoHS3 compliance recommended for regulatory alignment
REACH unaffected status maintained across all alternatives

Substitute parts listed below meet these criteria with electrical parameters equal to or exceeding the MSA1162YT1 specification, with the exception of collector-emitter breakdown voltage, which is rated at 45 V in most alternatives. This represents a 10% reduction from the original 50 V specification and is acceptable for applications operating below 45 V.

Parameter Comparison

Part Number	Manufacturer	Ic (Max) mA	Vce(br) V	Vce Sat (Max) mV	hFE (Min)	Power (Max) mW	Freq (MHz)	Temp (°C)	Package	Status	RoHS
MSA1162YT1	onsemi	100	50	500	120	200	80	150	SC-59	Obsolete	Non-compliant
BC857A-7-F	Diodes Incorporated	100	45	650	125	300	200	-65 to 150	SOT-23-3	Active	ROHS3
BC857A-HF	Comchip Technology	100	45	650	125	250	100	-65 to 150	SOT-23-3	Active	ROHS3
BC857A-TP	Micro Commercial Co	100	45	650	125	310	200	-55 to 150	SOT-23-3	Active	ROHS3
BC857B-HF	Comchip Technology	100	45	650	125	250	100	-65 to 150	SOT-23-3	Active	ROHS3
BC857B-TP	Micro Commercial Co	100	45	650	220	310	200	-55 to 150	SOT-23-3	Active	ROHS3
BC857BE6327HTSA1	Infineon Technologies	100	45	650	220	330	250	150	PG-SOT23	Last Time Buy	ROHS3
BC857BR TR PBFREE	Central Semiconductor Corp	100	45	650	220	350	100	-65 to 150	SOT-23	Active	ROHS3
BC857BT116	Rohm Semiconductor	100	45	650	210	350	250	150	SST3	Not For New Designs	ROHS3
BC857C TR PBFREE	Central Semiconductor Corp	100	45	50	420	350	100	-65 to 150	SOT-23	Active	ROHS3
BC860C,235	Nexperia USA Inc.	100	45	650	420	250	100	150	TO-236AB	Active	ROHS3

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

The BC857A-7-F, BC857A-TP, BC857B-TP, and BC857C TR PBFREE are recommended as primary substitutes. These parts are classified as Active, carry RoHS3 compliance certification, and maintain full electrical compatibility with the MSA1162YT1 within the specified operating parameters. All are available in standard surface mount packages (SOT-23-3 or SOT-23) with unlimited moisture sensitivity rating (MSL-1).

Secondary Substitutes (Acceptable for Existing Designs):

BC857A-HF, BC857B-HF, BC857BR TR PBFREE, and BC860C,235 are acceptable alternatives with Active product status and RoHS3 compliance. These parts provide equivalent or superior electrical performance and are suitable for direct replacement in existing applications.

Conditional Substitutes (Limited Application):

BC857BE6327HTSA1 (Infineon) carries Last Time Buy status and should be used only when supply continuity is critical. BC857BT116 (Rohm) is marked Not For New Designs and is suitable only for sustaining production of existing products.

Voltage Derating Consideration:

All substitute parts are rated for 45 V collector-emitter breakdown voltage, compared to the MSA1162YT1 specification of 50 V. Applications operating at or above 45 V require circuit review to confirm adequate safety margin. Applications operating below 45 V experience no functional limitation.

Frequently Asked Questions (FAQ)

Q: Can BC857A-7-F directly replace MSA1162YT1 in all applications?

A: BC857A-7-F is electrically compatible with MSA1162YT1 for applications operating below 45 V collector-emitter voltage. The primary difference is the reduced voltage rating (45 V vs. 50 V). Pin configuration and package footprint are identical. Verify circuit operating voltage before substitution.

Q: What is the difference between BC857A and BC857B variants?

A: BC857A and BC857B variants differ in DC current gain (hFE) specification. BC857A is specified with hFE minimum of 125, while BC857B is specified with hFE minimum of 220. Both are electrically interchangeable in most applications. Select based on circuit biasing requirements.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 compliance certification. The original MSA1162YT1 is RoHS non-compliant. Substitution with any listed alternative satisfies RoHS3 regulatory requirements.

Q: Does package designation affect substitution compatibility?

A: All substitute parts are available in TO-236-3, SC-59, or SOT-23-3 surface mount packages with identical three-terminal PNP pin configuration. Package designations (SOT-23-3, SOT-23, PG-SOT23, SST3, TO-236AB) refer to the same physical footprint. Verify PCB layout compatibility with specific supplier device package designation.

Q: What is the significance of "Last Time Buy" and "Not For New Designs" status?

A: Parts marked Last Time Buy (BC857BE6327HTSA1) indicate the manufacturer will cease production after a specified date. Parts marked Not For New Designs (BC857BT116) are no longer recommended for new circuit development but remain available for sustaining existing products. For new designs, select parts with Active status.

Q: Can MSA1162YT1 be used in applications requiring 45 V operation?

A: Yes. The MSA1162YT1 50 V rating provides adequate margin for 45 V operation. However, the reverse substitution (using 45 V rated parts in 50 V applications) requires circuit verification to confirm adequate safety margin.

Q: What is the impact of different transition frequencies on substitution?

A: The MSA1162YT1 specifies 80 MHz transition frequency. Most substitute parts offer 100 MHz or higher. Higher transition frequency provides improved high-frequency performance and faster switching response. This represents an enhancement over the original specification and does not create compatibility issues.

Q: Are there supply chain advantages to selecting specific substitute manufacturers?

A: Multiple manufacturers provide equivalent parts with Active status and RoHS3 compliance. Selection should prioritize availability, lead time, and pricing based on current supply conditions. Diodes Incorporated (BC857A-7-F), Micro Commercial Co (BC857A-TP, BC857B-TP), and Central Semiconductor Corp (BC857BR TR PBFREE, BC857C TR PBFREE) all maintain active inventory with established distribution channels.

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