2SA2124-S-TD-E Equivalent & Substitute Parts

Part Overview

The 2SA2124-S-TD-E is a PNP bipolar junction transistor manufactured by onsemi, rated for 30 V collector-emitter breakdown voltage and 2 A maximum collector current. This surface mount device operates at 440 MHz transition frequency with 3.5 W maximum power dissipation in a TO-243AA package (PCP supplier package). The part is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Maximum Collector Current (Ic)	2	A
Collector-Emitter Breakdown Voltage (Max)	30	V
Vce Saturation (Max)	400 mV @ 75 mA, 1.5 A	—
Collector Cutoff Current (ICBO)	100	nA
DC Current Gain (hFE Min)	200 @ 100 mA, 2 V	—
Maximum Power Dissipation	3.5	W
Transition Frequency	440	MHz
Package / Case	TO-243AA	—
Mounting Type	Surface Mount	—
Moisture Sensitivity Level	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the 2SA2124-S-TD-E is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor type: PNP
Maximum collector current: ≥ 2 A
Collector-emitter breakdown voltage: ≥ 30 V
Package / case: TO-243AA (surface mount)
DC current gain (hFE): ≥ 200 @ specified test conditions
Vce saturation characteristics: compatible with application requirements

Secondary Considerations:

Transition frequency: 240 MHz minimum (application-dependent)
Maximum power dissipation: ≥ 500 mW (application-dependent)
Collector cutoff current: ≤ 1 µA acceptable
Moisture sensitivity level: 1 (Unlimited)
RoHS and REACH compliance status

Substitute parts are grouped into three categories: direct equivalents from onsemi with identical electrical specifications, compatible alternatives from Rohm Semiconductor with equivalent or superior ratings, and functionally compatible parts from Nexperia with modified electrical characteristics suitable for specific applications.

Parameter Comparison

Parameter	2SA2124-S-TD-E	2SA2124-TD-E	PCP1103-TD-H	2SAR512P5T100	2SAR512PT100	2SAR542PT100	PBSS5240XF
Manufacturer	onsemi	onsemi	onsemi	Rohm	Rohm	Rohm	Nexperia
Transistor Type	PNP	PNP	PNP	PNP	PNP	PNP	PNP
Ic (Max) [A]	2	2	1.5	2	2	5	2
Vce Breakdown (Max) [V]	30	30	30	30	30	30	40
Vce Saturation (Max) [mV]	400 @ 75mA, 1.5A	400 @ 75mA, 1.5A	375 @ 15mA, 750mA	400 @ 35mA, 700mA	400 @ 35mA, 700mA	400 @ 100mA, 5A	140 @ 5mA, 100mA
ICBO (Max) [nA]	100	100	100	1000	1000	1000	100
hFE (Min)	200 @ 100mA, 2V	200 @ 100mA, 5V	200 @ 100mA, 2V	200 @ 100mA, 2V	200 @ 100mA, 2V	200 @ 500mA, 2V	300 @ 1mA, 5V
Power (Max) [W]	3.5	3.5	3.5	0.5	2	2	0.5
Frequency - Transition [MHz]	440	440	450	430	430	240	150
Package / Case	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA	TO-243AA
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Obsolete	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Equivalent (Preferred for Pin-Compatible Replacement):

The 2SA2124-TD-E from onsemi is the direct equivalent of the 2SA2124-S-TD-E, differing only in packaging format (Tape & Reel versus cut tape). This part maintains identical electrical specifications including 2 A collector current, 30 V breakdown voltage, 440 MHz transition frequency, and 3.5 W power dissipation. The 2SA2124-TD-E carries Last Time Buy status with ROHS3 compliance, making it suitable for immediate design transitions. Inventory availability is 26,569 units.

Active Production Alternatives (Long-Term Availability):

The 2SAR512P5T100 and 2SAR512PT100 from Rohm Semiconductor provide active production alternatives with identical collector current (2 A) and breakdown voltage (30 V) ratings. Both parts maintain the TO-243AA package and surface mount configuration. The 2SAR512P5T100 offers 500 mW power dissipation with 430 MHz transition frequency, while the 2SAR512PT100 provides 2 W power dissipation. Both are ROHS3 compliant with unlimited moisture sensitivity level. These parts are suitable for applications where power dissipation requirements are ≤ 2 W and transition frequency ≥ 430 MHz.

The 2SAR542PT100 from Rohm Semiconductor provides enhanced current capability (5 A maximum) with identical 30 V breakdown voltage and TO-243AA package. This part is suitable for applications requiring higher collector current margins. Transition frequency is reduced to 240 MHz, and power dissipation is 2 W. ROHS3 compliance and active production status ensure long-term availability.

Alternative with Modified Voltage Rating:

The PBSS5240XF from Nexperia USA Inc. offers 40 V collector-emitter breakdown voltage (exceeding the 30 V requirement) with 2 A collector current in the TO-243AA package. This part features superior saturation voltage characteristics (140 mV) and higher DC current gain (300 minimum). Transition frequency is reduced to 150 MHz, and power dissipation is 500 mW. The part carries AEC-Q100 automotive qualification and ROHS3 compliance. Selection of this part is appropriate for applications requiring higher voltage margin or automotive-grade reliability.

Product Status Considerations:

The 2SA2124-S-TD-E is classified as obsolete. The 2SA2124-TD-E is Last Time Buy status. Both onsemi parts should be transitioned to active production alternatives (Rohm or Nexperia) for new designs or long-term production commitments. All recommended substitutes carry active production status or ROHS3 compliance, ensuring regulatory compliance and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can the 2SA2124-TD-E directly replace the 2SA2124-S-TD-E?

A: Yes. The 2SA2124-TD-E is electrically identical to the 2SA2124-S-TD-E. The difference is packaging format: 2SA2124-S-TD-E is supplied in cut tape, while 2SA2124-TD-E is supplied in Tape & Reel. Both use the TO-243AA package and are pin-compatible. However, 2SA2124-TD-E carries Last Time Buy status, indicating limited future availability.

Q: What is the primary difference between the Rohm 2SAR512P5T100 and 2SAR512PT100?

A: Both parts are electrically equivalent with 2 A collector current and 30 V breakdown voltage. The primary difference is maximum power dissipation: 2SAR512P5T100 is rated 500 mW, while 2SAR512PT100 is rated 2 W. Selection depends on application power requirements. Both maintain 430 MHz transition frequency and TO-243AA package.

Q: Why does the PBSS5240XF have a higher breakdown voltage (40 V) than the original part (30 V)?

A: The PBSS5240XF is designed for applications requiring higher voltage margin. The 40 V rating provides additional safety margin in circuits operating near 30 V. This part is suitable as a substitute when voltage headroom is beneficial. However, transition frequency is reduced to 150 MHz, which may limit use in high-frequency applications.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended substitute parts carry ROHS3 compliance status. The original 2SA2124-S-TD-E does not specify RoHS status. All active production alternatives (2SAR512P5T100, 2SAR512PT100, 2SAR542PT100, PBSS5240XF) are ROHS3 compliant, meeting current regulatory requirements.

Q: Can the PCP1103-TD-H substitute for the 2SA2124-S-TD-E?

A: The PCP1103-TD-H is functionally compatible but not a direct substitute. Maximum collector current is reduced to 1.5 A (versus 2 A), limiting use to applications requiring ≤ 1.5 A. Breakdown voltage (30 V) and package (TO-243AA) are identical. Transition frequency is slightly higher (450 MHz). This part is suitable only for current-limited applications.

Q: What is the significance of the 2SAR542PT100 having 5 A maximum collector current?

A: The 2SAR542PT100 provides higher current capability than the original 2 A specification. This part is suitable for applications requiring higher collector current or for designs where current margin is desired. The 30 V breakdown voltage and TO-243AA package remain compatible. Transition frequency is reduced to 240 MHz, which may limit high-frequency applications.

Q: Are there package compatibility concerns when substituting these parts?

A: All recommended substitute parts use the TO-243AA package and surface mount configuration, ensuring mechanical and electrical compatibility with the original 2SA2124-S-TD-E. No PCB layout modifications are required. Moisture sensitivity level is 1 (Unlimited) for all parts, indicating no special handling requirements.

Q: Which substitute part offers the best long-term availability?

A: The 2SAR512P5T100, 2SAR512PT100, 2SAR542PT100, and PBSS5240XF all carry active production status, ensuring long-term availability. The 2SAR512P5T100 and 2SAR512PT100 from Rohm Semiconductor provide the closest electrical match to the original part with 2 A collector current and 30 V breakdown voltage. Inventory levels are substantial (680,300 and 3,300 units respectively).

Q: What are the key electrical parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: (1) PNP transistor type, (2) maximum collector current ≥ 2 A, (3) collector-emitter breakdown voltage ≥ 30 V, (4) TO-243AA package, (5) surface mount configuration, and (6) DC current gain (hFE) ≥ 200. Application-specific requirements may impose additional constraints on transition frequency and power dissipation.

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