BSS84TA MOSFET P-Channel 50V 130mA Equivalent & Substitute Parts

Part Overview

The BSS84TA is a P-Channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) manufactured by Diodes Incorporated, rated for 50V drain-to-source voltage with 130mA continuous drain current. The device is packaged in SOT-23-3 surface mount configuration and is designed for general-purpose switching and amplification applications in low-power circuits.

The BSS84TA carries an Obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Key Parameters

Parameter	Value	Unit
FET Type	P-Channel	—
Drain to Source Voltage (Vdss)	50	V
Continuous Drain Current (Id) @ 25°C	130	mA
Rds On (Max) @ 100mA, 5V	10	Ohm
Vgs(th) (Max) @ 1mA	2	V
Vgs (Max)	±20	V
Power Dissipation (Max)	360	mW
Operating Temperature Range	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BSS84TA is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Equivalence Criteria:

FET Type: P-Channel configuration
Drain to Source Voltage (Vdss): 50V minimum rating
Continuous Drain Current (Id): 130mA at 25°C
On-State Resistance (Rds On): 10 Ohm maximum at specified gate-source voltage
Gate-Source Threshold Voltage (Vgs(th)): 2V maximum
Gate-Source Voltage Range (Vgs): ±20V
Operating Temperature Range: -55°C to 150°C minimum

Mechanical Equivalence Criteria:

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

Compliance Equivalence Criteria:

RoHS3 Compliance
REACH Unaffected Status

Substitute parts must satisfy all electrical parameters within the specified tolerances, maintain identical or compatible package footprints, and meet or exceed the compliance certifications of the original part. Parts are grouped by product status (Active, Obsolete, Not For New Designs) to facilitate selection based on supply chain and design lifecycle requirements.

Parameter Comparison

Parameter	BSS84TA (Diodes)	BSS84-7-F (Diodes)	BSS84 (Good-Ark)	BSS84,215 (Nexperia)	BSS84LT1G (onsemi)
Manufacturer	Diodes Incorporated	Diodes Incorporated	Good-Ark Semiconductor	Nexperia USA Inc.	onsemi
Product Status	Obsolete	Active	Active	Not For New Designs	Active
FET Type	P-Channel	P-Channel	P-Channel	P-Channel	P-Channel
Vdss	50 V	50 V	50 V	50 V	50 V
Id @ 25°C	130 mA	130 mA	130 mA	130 mA	130 mA
Rds On (Max) @ 100mA, 5V	10 Ohm	10 Ohm	10 Ohm	10 Ohm @ 130mA, 10V	10 Ohm
Vgs(th) (Max)	2 V @ 1mA	2 V @ 1mA	2 V @ 250µA	2 V @ 1mA	2 V @ 250µA
Vgs (Max)	±20 V	±20 V	±20 V	±20 V	±20 V
Power Dissipation (Max)	360 mW (Ta)	300 mW (Ta)	225 mW	250 mW (Tc)	225 mW (Ta)
Operating Temperature	-55 to 150 °C	-55 to 150 °C	150 °C (TJ)	-65 to 150 °C	-55 to 150 °C
Package	SOT-23-3	SOT-23-3	SOT-23	TO-236AB	SOT-23-3 (TO-236)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitute (Active Status):

The BSS84-7-F (Diodes Incorporated) is the direct equivalent substitute for the obsolete BSS84TA. Both devices are manufactured by Diodes Incorporated and share identical electrical specifications across all critical parameters: 50V Vdss, 130mA Id, 10 Ohm Rds On, and 2V Vgs(th). The BSS84-7-F maintains Active product status with 205,100 units in stock, ensuring supply chain continuity. The package configuration (SOT-23-3) and compliance certifications (ROHS3, MSL 1) are identical. The only variance is a minor reduction in maximum power dissipation from 360mW to 300mW, which remains adequate for applications within the original design envelope.

Secondary Substitutes (Active Status):

The BSS84LT1G (onsemi) is an Active-status alternative that meets all electrical requirements with identical Vdss, Id, Rds On, and Vgs specifications. The device is packaged in SOT-23-3 (TO-236) configuration with full ROHS3 and MSL 1 compliance. Power dissipation is rated at 225mW, which is lower than the original but suitable for standard switching applications. Inventory availability is 272,100 units.

The BSS84 (Good-Ark Semiconductor) is an Active-status alternative meeting core electrical specifications. This part carries 359,158 units in stock. Power dissipation is specified at 225mW. The operating temperature specification lists only the maximum (150°C TJ) without explicit minimum temperature range, which differs from the original -55°C to 150°C specification.

Not Recommended for New Designs:

The BSS84,215 (Nexperia USA Inc.) carries a "Not For New Designs" product status and should not be selected for new circuit implementations. Although it meets electrical equivalence criteria, this designation indicates the manufacturer has discontinued active support for this part number. The part is suitable only for sustaining production of existing designs where no alternative is available.

Selection Basis:

Selection among Active-status substitutes should prioritize BSS84-7-F for direct Diodes Incorporated continuity, followed by BSS84LT1G (onsemi) or BSS84 (Good-Ark) based on supply chain availability and procurement terms. All three Active alternatives provide equivalent electrical performance within the design specifications of the original BSS84TA.

Frequently Asked Questions (FAQ)

Q: Can the BSS84-7-F directly replace the BSS84TA without circuit modification?

A: Yes. The BSS84-7-F is a direct electrical and mechanical equivalent. Both devices share identical Vdss (50V), Id (130mA), Rds On (10 Ohm), Vgs(th) (2V), and package configuration (SOT-23-3). No circuit modifications are required. The reduction in maximum power dissipation from 360mW to 300mW does not affect standard switching applications operating within the original design envelope.

Q: What is the difference between the BSS84-7-F and BSS84LT1G?

A: Both parts meet the core electrical specifications of the BSS84TA (50V Vdss, 130mA Id, 10 Ohm Rds On, 2V Vgs(th)). The primary differences are manufacturer (Diodes Incorporated vs. onsemi) and power dissipation rating (300mW vs. 225mW). The BSS84-7-F is the direct Diodes Incorporated equivalent, while the BSS84LT1G is an onsemi alternative. Both are Active-status parts with adequate inventory.

Q: Why is the BSS84,215 marked "Not For New Designs"?

A: The "Not For New Designs" designation indicates that Nexperia USA Inc. has discontinued active development and support for this part number. While the BSS84,215 meets electrical equivalence criteria, it should be used only for sustaining production of existing designs. New circuit designs should utilize Active-status alternatives such as BSS84-7-F or BSS84LT1G.

Q: Are all substitute parts in the same package?

A: All substitute parts are packaged in SOT-23-3 (TO-236-3, SC-59) surface mount configuration, which is mechanically and electrically compatible with the original BSS84TA. PCB footprints and soldering procedures remain unchanged.

Q: What is the significance of the MSL 1 (Unlimited) rating?

A: MSL 1 (Unlimited) indicates that the component has unlimited shelf life and does not require special moisture-controlled storage or handling procedures. All substitute parts carry this same MSL rating, ensuring identical storage and handling requirements.

Q: Do all substitute parts comply with RoHS3 and REACH requirements?

A: Yes. All substitute parts listed (BSS84-7-F, BSS84, BSS84,215, and BSS84LT1G) are ROHS3 Compliant and REACH Unaffected, matching the compliance status of the original BSS84TA.

Q: Which substitute should be selected for new designs?

A: For new designs, select either the BSS84-7-F (Diodes Incorporated) or BSS84LT1G (onsemi), both of which carry Active product status. The BSS84-7-F is the direct Diodes equivalent, while the BSS84LT1G provides an alternative from onsemi. The BSS84 (Good-Ark) is also Active but lacks explicit minimum operating temperature specification. Avoid BSS84,215 for new designs due to its "Not For New Designs" status.

Q: Is there a performance difference in switching speed or gate charge between substitutes?

A: Input capacitance (Ciss) specifications vary slightly among substitutes: BSS84TA (40 pF @ 25V), BSS84-7-F (45 pF @ 25V), BSS84 (30 pF @ 5V), BSS84,215 (45 pF @ 25V), and BSS84LT1G (30 pF @ 5V). These variations are within acceptable tolerances for standard switching applications. Detailed switching speed analysis requires access to complete datasheet specifications not provided in this reference.

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