CPH3122-TL-E Equivalent & Substitute Parts

Part Overview

The CPH3122-TL-E is a PNP Bipolar Junction Transistor (BJT) manufactured by onsemi, rated for 30V collector-emitter breakdown voltage and 3A maximum collector current. This device is designed for surface mount applications in the 3-CPH package and operates at frequencies up to 420MHz with a maximum power dissipation of 900mW.

The CPH3122-TL-E carries an Obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this transistor.

Key Parameters

Parameter	Value	Unit
Transistor Type	PNP	—
Voltage - Collector Emitter Breakdown (Max)	30	V
Current - Collector (Ic) (Max)	3	A
Power - Max	900	mW
Frequency - Transition	420	MHz
Vce Saturation (Max) @ Ib, Ic	180mV @ 75mA, 1.5A	—
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 500mA, 2V	—
Operating Temperature (Max)	150	°C
Mounting Type	Surface Mount	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the CPH3122-TL-E is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: PNP polarity
Voltage - Collector Emitter Breakdown (Max): minimum 30V
Current - Collector (Ic) (Max): minimum 3A
Power - Max: minimum 900mW
Frequency - Transition: minimum 420MHz
Operating Temperature (Max): 150°C
Mounting Type: Surface Mount
RoHS Status: ROHS3 Compliant

Substitute parts are grouped based on their ability to meet or exceed these parameters. Parts that fall below the specified thresholds in any critical parameter are not suitable direct replacements and require circuit redesign evaluation.

Parameter Comparison

Parameter	CPH3122-TL-E	2SB1708TL	NSS40200LT1G	2SA1036KT146Q	2SA1036KT146R
Manufacturer	onsemi	Rohm Semiconductor	onsemi	Rohm Semiconductor	Rohm Semiconductor
Transistor Type	PNP	PNP	PNP	PNP	PNP
Voltage - Collector Emitter Breakdown (Max)	30V	30V	40V	32V	32V
Current - Collector (Ic) (Max)	3A	3A	2A	500mA	500mA
Power - Max	900mW	500mW	460mW	200mW	200mW
Frequency - Transition	420MHz	200MHz	100MHz	200MHz	200MHz
Vce Saturation (Max) @ Ib, Ic	180mV @ 75mA, 1.5A	250mV @ 30mA, 1.5A	170mV @ 200mA, 2A	600mV @ 30mA, 300mA	600mV @ 30mA, 300mA
DC Current Gain (hFE) (Min) @ Ic, Vce	200 @ 500mA, 2V	270 @ 200mA, 2V	220 @ 500mA, 2V	120 @ 100mA, 3V	120 @ 100mA, 3V
Operating Temperature (Max)	150°C	150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SC-96	SC-96	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

2SB1708TL (Rohm Semiconductor)

The 2SB1708TL is the closest functional equivalent to the CPH3122-TL-E. Both devices share identical maximum collector current (3A) and collector-emitter breakdown voltage (30V) specifications. The 2SB1708TL maintains the same SC-96 package footprint, enabling direct PCB layout compatibility. This part carries Active product status, ensuring long-term supply availability. The 2SB1708TL is ROHS3 compliant and carries identical environmental certifications. Power dissipation is lower (500mW vs. 900mW), and transition frequency is reduced (200MHz vs. 420MHz), which may require circuit performance verification in high-frequency applications.

NSS40200LT1G (onsemi)

The NSS40200LT1G is manufactured by the same supplier as the main part (onsemi) and carries Active product status. This device provides higher voltage rating (40V vs. 30V), offering improved voltage margin. However, maximum collector current is reduced to 2A, and power dissipation is limited to 460mW. Transition frequency is significantly lower at 100MHz. The NSS40200LT1G uses a different package (SOT-23-3) requiring PCB layout modification. This part is suitable for applications where current and power requirements can be reduced and frequency performance is not critical.

2SA1036KT146Q and 2SA1036KT146R (Rohm Semiconductor)

Both variants of the 2SA1036 series are functionally identical and carry Active product status. These parts are not direct replacements due to significantly reduced current rating (500mA vs. 3A) and power dissipation (200mW vs. 900mW). The 2SA1036 series is suitable only for low-current applications and requires substantial circuit redesign. Package compatibility differs (SOT-23-3 vs. SC-96). These parts are included in the substitute list but are applicable only to modified designs with reduced current requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2SB1708TL directly replace the CPH3122-TL-E without PCB modifications?

A: The 2SB1708TL uses the same SC-96 package as the CPH3122-TL-E, enabling direct PCB footprint compatibility. No layout modifications are required. However, circuit performance must be verified for applications operating at frequencies above 200MHz, as the 2SB1708TL transition frequency is 200MHz compared to the original 420MHz specification.

Q: Why are the 2SA1036KT146Q and 2SA1036KT146R listed as substitutes if they have lower current ratings?

A: These parts are listed as substitutes based on the provided substitute list data. However, they are not suitable direct replacements for the CPH3122-TL-E due to maximum collector current of 500mA versus the required 3A. These parts are applicable only to redesigned circuits with reduced current requirements and should not be selected for applications requiring the full 3A current capability.

Q: What is the impact of using NSS40200LT1G in place of CPH3122-TL-E?

A: The NSS40200LT1G provides higher voltage rating (40V) but reduced current capacity (2A vs. 3A) and lower power dissipation capability (460mW vs. 900mW). Additionally, the package changes from SC-96 to SOT-23-3, requiring PCB redesign. This substitution is suitable only for applications where maximum current demand does not exceed 2A and power dissipation remains below 460mW.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed (2SB1708TL, NSS40200LT1G, 2SA1036KT146Q, and 2SA1036KT146R) carry ROHS3 compliance certification, matching the environmental compliance status of the CPH3122-TL-E.

Q: What is the primary advantage of 2SB1708TL over other substitutes?

A: The 2SB1708TL maintains identical current (3A) and voltage (30V) ratings as the CPH3122-TL-E and uses the same SC-96 package, requiring no PCB modifications. It carries Active product status, ensuring supply continuity. The primary trade-off is reduced transition frequency (200MHz vs. 420MHz) and lower power dissipation (500mW vs. 900mW).

Q: Can package differences between substitutes affect circuit performance?

A: Yes. Package differences affect PCB layout, thermal management, and parasitic characteristics. The 2SB1708TL maintains the SC-96 package of the original part. The NSS40200LT1G and 2SA1036 series use SOT-23-3 packages, which have different thermal properties and require layout redesign. Package selection must align with thermal and spatial requirements of the application.

Q: What should be verified before implementing a substitute part?

A: Verify that the substitute part meets or exceeds all critical parameters: collector current, voltage rating, power dissipation, and frequency response. Confirm package compatibility with existing PCB layouts or plan for redesign. Validate that product status is Active to ensure supply chain continuity. Confirm RoHS and environmental compliance certifications match design requirements.

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