2SC5455-A Equivalent & Substitute Parts

Part Overview

The 2SC5455-A is an RF transistor NPN manufactured by CEL, designed for high-frequency applications up to 12GHz with a maximum power dissipation of 200mW. This device operates at 6V collector-emitter breakdown voltage and delivers 100mA maximum collector current in a surface mount TO-253-4 package. The product is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. Substitute parts must maintain compatibility with RF circuit requirements while meeting or exceeding the electrical performance specifications of the original device.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	—
Voltage - Collector Emitter Breakdown (Max)	6V	V
Frequency - Transition	12GHz	GHz
Noise Figure (Typ @ f)	1.5dB @ 2GHz	dB
Gain	10dB	dB
Power - Max	200mW	mW
Current - Collector (Ic) (Max)	100mA	mA
DC Current Gain (hFE) (Min)	75 @ 30mA, 3V	—
Operating Temperature (TJ)	150°C	°C
Mounting Type	Surface Mount	—
Package / Case	TO-253-4, TO-253AA	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—
REACH Status	REACH Unaffected	—

Substitute Part Grouping Explanation

Substitution of the 2SC5455-A is determined by the following critical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Frequency - Transition: Minimum 12GHz capability to maintain RF performance
Voltage - Collector Emitter Breakdown: Minimum 4V to 6V range for circuit compatibility
Power - Max: Minimum 100mW to 200mW for thermal management
Current - Collector (Ic) (Max): Minimum 30mA to 100mA for bias and signal handling
Operating Temperature: 150°C maximum junction temperature
Mounting Type: Surface mount configuration
Noise Figure: 1.5dB or lower at 2GHz for low-noise applications
Gain: 9.5dB to 10.5dB range for signal amplification

Secondary Compatibility Factors:

Package compatibility: Surface mount packages (SC-70, SC-75, SC-81, SC-82A, SOT-323, SOT-343)
Compliance: ROHS3 compliance and REACH unaffected status
Moisture Sensitivity: MSL 1 (Unlimited) preferred for reliability

Substitute parts are grouped based on frequency capability, voltage rating, and power dissipation alignment with the original 2SC5455-A specifications. Parts exceeding the original specifications in frequency, voltage, or power are acceptable for direct substitution provided they maintain the same or superior noise figure and gain characteristics.

Parameter Comparison

Parameter	2SC5455-A	2SC5646A-TL-H	BFP540ESDH6327XTSA1	BFP640H6327XTSA1	BFP650FH6327XTSA1	BFR193WH6327XTSA1
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	6V	4V	5V	4.5V	4.5V	12V
Frequency - Transition	12GHz	10GHz ~ 12.5GHz	30GHz	40GHz	42GHz	8GHz
Noise Figure (Typ @ f)	1.5dB @ 2GHz	1.5dB @ 2GHz	0.9dB ~ 1.4dB @ 1.8GHz	0.65dB ~ 1.2dB @ 1.8GHz ~ 6GHz	0.8dB ~ 1.9dB @ 1.8GHz ~ 6GHz	1dB ~ 1.6dB @ 900MHz ~ 1.8GHz
Gain	10dB	9.5dB ~ 10.5dB @ 2GHz	21.5dB	12.5dB	11dB ~ 21.5dB	10.5dB ~ 16dB
Power - Max	200mW	100mW	250mW	200mW	500mW	580mW
Current - Collector (Ic) (Max)	100mA	30mA	80mA	50mA	150mA	80mA
DC Current Gain (hFE) (Min)	75 @ 30mA, 3V	100 @ 5mA, 1V	50 @ 20mA, 3.5V	110 @ 30mA, 3V	110 @ 80mA, 3V	70 @ 30mA, 8V
Operating Temperature (TJ)	150°C	150°C	150°C	150°C	150°C	150°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-253-4, TO-253AA	SC-81	SC-82A, SOT-343	SC-82A, SOT-343	4-SMD, Flat Leads	SC-70, SOT-323
Product Status	Obsolete	Obsolete	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Primary Substitutes (Closest Electrical Match):

The 2SC5646A-TL-H and BFP540ESDH6327XTSA1 provide the closest electrical alignment to the 2SC5455-A. The 2SC5646A-TL-H operates at 10GHz to 12.5GHz with identical noise figure (1.5dB @ 2GHz) and comparable gain (9.5dB to 10.5dB). However, this part is obsolete. The BFP540ESDH6327XTSA1 is an active product with superior frequency capability (30GHz), lower noise figure (0.9dB to 1.4dB @ 1.8GHz), and higher power rating (250mW), making it suitable for direct substitution with enhanced performance margins.

Secondary Substitutes (Extended Performance Range):

The BFR193WH6327XTSA1 operates at 8GHz with higher voltage rating (12V) and superior power dissipation (580mW). This part is suitable for applications requiring higher voltage headroom and thermal margin. The BFP640H6327XTSA1 and BFP650FH6327XTSA1 provide ultra-high frequency capability (40GHz and 42GHz respectively) with lower noise figures and higher power ratings, appropriate for advanced RF applications exceeding the original 12GHz specification.

Compliance and Availability:

All recommended active substitutes (BFP540ESDH6327XTSA1, BFP640H6327XTSA1, BFP650FH6327XTSA1, BFR193WH6327XTSA1) are ROHS3 compliant and REACH unaffected. These parts maintain MSL 1 (Unlimited) moisture sensitivity rating, ensuring equivalent reliability and handling requirements. Inventory availability is confirmed for all active products.

Package Considerations:

The 2SC5455-A uses TO-253-4 packaging. Substitute parts employ alternative surface mount packages (SC-70, SC-81, SC-82A, SOT-323, SOT-343, 4-TSFP). PCB layout modifications are required to accommodate different package footprints. Thermal performance and signal integrity must be re-evaluated during board redesign.

Frequently Asked Questions (FAQ)

Q: Can the 2SC5646A-TL-H directly replace the 2SC5455-A?

A: The 2SC5646A-TL-H provides electrical compatibility with identical noise figure (1.5dB @ 2GHz) and comparable gain characteristics. However, this part is classified as obsolete. For new designs and long-term procurement, the active substitute BFP540ESDH6327XTSA1 is recommended. Package footprint differences require PCB layout modification.

Q: What is the primary difference between BFP540ESDH6327XTSA1 and BFP650FH6327XTSA1?

A: The BFP540ESDH6327XTSA1 operates at 30GHz with 250mW power rating and 80mA maximum collector current. The BFP650FH6327XTSA1 operates at 42GHz with 500mW power rating and 150mA maximum collector current. The BFP650FH6327XTSA1 provides higher frequency capability and power handling for demanding RF applications. Package differences (SOT-343 versus 4-TSFP) affect board layout requirements.

Q: Is the BFR193WH6327XTSA1 suitable for 12GHz applications?

A: The BFR193WH6327XTSA1 operates at 8GHz transition frequency, which is below the 12GHz specification of the 2SC5455-A. This part is not recommended for applications requiring full 12GHz performance. However, it provides higher voltage rating (12V) and superior power dissipation (580mW) for lower frequency RF circuits.

Q: What package changes occur when substituting the 2SC5455-A?

A: The 2SC5455-A uses TO-253-4 packaging. Substitute parts employ SC-70, SC-81, SC-82A, SOT-323, SOT-343, or 4-TSFP packages. Each package has different footprint dimensions, pin spacing, and thermal characteristics. PCB redesign is required to accommodate the selected substitute part package.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts (BFP540ESDH6327XTSA1, BFP640H6327XTSA1, BFP650FH6327XTSA1, BFR193WH6327XTSA1) are ROHS3 compliant and REACH unaffected. The 2SC5646A-TL-H is also ROHS3 compliant but classified as obsolete. Compliance documentation is available from respective manufacturers.

Q: What is the noise figure advantage of BFP640H6327XTSA1 over the 2SC5455-A?

A: The 2SC5455-A has a noise figure of 1.5dB @ 2GHz. The BFP640H6327XTSA1 provides 0.65dB to 1.2dB @ 1.8GHz to 6GHz, representing a 0.3dB to 0.85dB improvement. This lower noise figure reduces system noise figure in low-noise RF applications.

Q: Can the 2SC4726TLP be used as a substitute?

A: The 2SC4726TLP operates at 3.2GHz transition frequency, which is significantly below the 12GHz requirement of the 2SC5455-A. This part is not suitable for direct substitution in 12GHz RF applications. It is appropriate only for lower frequency RF circuits below 3.2GHz.

Q: What are the moisture sensitivity requirements for substitute parts?

A: All recommended substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating, identical to the 2SC5455-A. This ensures equivalent handling, storage, and reflow requirements. No additional moisture control measures are necessary during assembly.

Q: Is the BFP650FH6327XTSA1 backward compatible with the 2SC5455-A circuit?

A: The BFP650FH6327XTSA1 provides superior electrical performance (42GHz frequency, 0.8dB to 1.9dB noise figure, 500mW power) compared to the 2SC5455-A. Circuit compatibility depends on bias network design and impedance matching. The higher frequency capability and power rating allow operation in the original 12GHz application with improved performance margins. Package footprint differences require PCB modification.

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