2SC393400L Equivalent & Substitute Parts

Part Overview

The 2SC393400L is an RF transistor manufactured by Panasonic Electronic Components, classified as an NPN bipolar junction transistor (BJT) designed for RF applications. This component operates at 12V with a transition frequency of 4.5GHz and maximum power dissipation of 150mW in a surface mount SMini3-G1 package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and system maintenance. Designers and procurement teams require active alternatives that maintain functional compatibility within specified electrical and mechanical parameters.

Key Parameters

Parameter	Value	Unit
Transistor Type	NPN	-
Voltage - Collector Emitter Breakdown (Max)	12V	V
Frequency - Transition	4.5GHz	GHz
Power - Max	150mW	mW
Current - Collector (Ic) (Max)	30mA	mA
DC Current Gain (hFE) (Min)	40	@ 10mA, 10V
Operating Temperature (TJ)	150°C	°C
Mounting Type	Surface Mount	-
Package / Case	SC-70, SOT-323	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the 2SC393400L is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Transistor Type: NPN configuration required
Voltage Rating: Collector-Emitter breakdown voltage must equal or exceed 12V
Frequency Performance: Transition frequency must support 4.5GHz operation or higher
Power Dissipation: Maximum power rating must accommodate 150mW or greater
Current Capability: Collector current (Ic) must support 30mA or higher
DC Current Gain: hFE minimum must meet or exceed 40 at specified conditions
Operating Temperature: Must support 150°C junction temperature
Mounting: Surface mount configuration required
Package Compatibility: SC-70 or SOT-323 package footprint preferred for direct replacement

Substitute Classification:

Upgrade Substitutes: Parts that meet all primary criteria with equal or superior electrical performance and active product status
Similar Substitutes: Parts that meet core electrical criteria but may differ in package type, frequency range, or voltage rating; require design verification for specific application constraints

Parameter Comparison

Parameter	2SC393400L (Main)	BFR181WH6327XTSA1	BFP405H6740XTSA1	BFP640FESDH6327XTSA1	BFR460L3E6327XTMA1	KSP10TA
Manufacturer	Panasonic	Infineon	Infineon	Infineon	Infineon	Fairchild
Product Status	Obsolete	Active	Active	Active	Active	Active
Transistor Type	NPN	NPN	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	12V	12V	5V	4.7V	5.8V	25V
Frequency - Transition	4.5GHz	8GHz	25GHz	46GHz	22GHz	650MHz
Power - Max	150mW	175mW	75mW	200mW	200mW	350mW
Current - Collector (Ic) (Max)	30mA	20mA	25mA	50mA	50mA	-
DC Current Gain (hFE) (Min)	40 @ 10mA, 10V	70 @ 5mA, 8V	60 @ 5mA, 4V	110 @ 30mA, 3V	90 @ 20mA, 3V	60 @ 4mA, 10V
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	Through Hole
Package / Case	SC-70, SOT-323	SC-70, SOT-323	SC-82A, SOT-343	4-SMD, Flat Leads	SC-101, SOT-883	TO-226-3, TO-92-3
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	-
RoHS Status	-	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	-

Engineering Selection Recommendations

BFR181WH6327XTSA1 (Upgrade Substitute - Recommended)

The BFR181WH6327XTSA1 from Infineon Technologies is the primary upgrade substitute for the 2SC393400L. This part maintains identical voltage rating (12V), exceeds frequency performance (8GHz vs. 4.5GHz), and provides superior power dissipation (175mW vs. 150mW). The package footprint remains compatible (SC-70, SOT-323), enabling direct board-level replacement. The part carries active product status with ROHS3 compliance and unlimited moisture sensitivity rating. Inventory availability is substantial (275,300 units), ensuring supply chain continuity. The higher DC current gain (70 vs. 40) and improved noise figure (0.9dB-1.2dB) provide enhanced circuit performance.

BFP640FESDH6327XTSA1 (Similar Substitute - High Frequency Applications)

The BFP640FESDH6327XTSA1 is suitable for applications requiring extended frequency performance (46GHz) and higher current capability (50mA). However, the voltage rating is reduced to 4.7V, requiring design verification for 12V-rated circuits. The package type differs (4-TSFP vs. SMini3-G1), necessitating PCB layout modification. This part is appropriate only when frequency performance is the primary design constraint and voltage derating is acceptable.

BFR460L3E6327XTMA1 (Similar Substitute - Moderate Frequency Applications)

The BFR460L3E6327XTMA1 provides 22GHz frequency capability with 5.8V voltage rating and 200mW power dissipation. The package type (SC-101, SOT-883) differs from the original, requiring PCB redesign. This substitute is applicable for applications where 22GHz performance is sufficient and voltage derating from 12V to 5.8V is acceptable.

BFP405H6740XTSA1 (Similar Substitute - Ultra-High Frequency Applications)

The BFP405H6740XTSA1 operates at 25GHz with reduced voltage (5V) and power ratings (75mW). The package configuration (SC-82A, SOT-343) differs from the original. This part is limited to applications where ultra-high frequency performance is required and significant electrical parameter derating is acceptable.

KSP10TA (Similar Substitute - Legacy Through-Hole Applications)

The KSP10TA from Fairchild Semiconductor is a through-hole alternative with higher voltage rating (25V) but significantly lower frequency performance (650MHz). The mounting type differs fundamentally (through-hole vs. surface mount), making this substitute applicable only to legacy designs or applications where surface mount conversion is not feasible. Frequency performance is insufficient for the original 4.5GHz specification.

Frequently Asked Questions (FAQ)

Q: Can the BFR181WH6327XTSA1 be used as a direct replacement for the 2SC393400L?

A: Yes. The BFR181WH6327XTSA1 maintains the same voltage rating (12V), package footprint (SC-70, SOT-323), and operating temperature (150°C). The part provides superior frequency performance (8GHz vs. 4.5GHz) and power dissipation (175mW vs. 150mW), making it a direct upgrade substitute without circuit modification.

Q: What are the voltage derating implications when using BFP640FESDH6327XTSA1 or BFR460L3E6327XTMA1?

A: Both parts operate at reduced voltage ratings (4.7V and 5.8V respectively) compared to the original 12V specification. Circuits designed for 12V operation require design verification to confirm that reduced voltage ratings do not compromise system performance or introduce reliability concerns. These substitutes are applicable only when voltage derating is acceptable for the specific application.

Q: Why does the KSP10TA have lower frequency performance than the original part?

A: The KSP10TA is a through-hole RF transistor with transition frequency of 650MHz, significantly below the 4.5GHz requirement of the 2SC393400L. This part is not suitable for applications requiring 4.5GHz or higher frequency performance. It is listed as a substitute only for legacy through-hole designs where surface mount conversion is not feasible.

Q: What package considerations apply when selecting a substitute?

A: The 2SC393400L uses SC-70 (SOT-323) surface mount package. The BFR181WH6327XTSA1 maintains this footprint for direct replacement. Other substitutes employ different packages: BFP405H6740XTSA1 uses SC-82A (SOT-343), BFP640FESDH6327XTSA1 uses 4-TSFP, BFR460L3E6327XTMA1 uses SC-101 (SOT-883), and KSP10TA uses TO-92-3 through-hole. Package differences require PCB layout modification and design verification.

Q: Are all substitute parts RoHS compliant?

A: The Infineon substitutes (BFR181WH6327XTSA1, BFP405H6740XTSA1, BFP640FESDH6327XTSA1, BFR460L3E6327XTMA1) carry ROHS3 compliance certification. The Fairchild KSP10TA does not specify RoHS status in the provided data. Compliance verification is required for applications with RoHS requirements.

Q: What is the inventory status of substitute parts?

A: BFR181WH6327XTSA1 has 275,300 units in stock. BFP640FESDH6327XTSA1 has 3,652 units. BFR460L3E6327XTMA1 has 15,872 units. BFP405H6740XTSA1 has 914 units. KSP10TA has 2,100 units. All substitutes are available from current inventory.

Q: How do noise figure specifications compare across substitutes?

A: The 2SC393400L specifies 1.3dB-2.5dB noise figure at 800MHz. BFR181WH6327XTSA1 provides 0.9dB-1.2dB at 900MHz-1.8GHz (superior performance). BFP640FESDH6327XTSA1 specifies 0.55dB-1.7dB at 150MHz-10GHz. BFR460L3E6327XTMA1 specifies 1.1dB-1.35dB at 1.8GHz-3GHz. BFP405H6740XTSA1 specifies 1.25dB at 1.8GHz. KSP10TA does not provide noise figure data.

Q: What DC current gain differences exist between the main part and substitutes?

A: The 2SC393400L specifies minimum hFE of 40 at 10mA, 10V. BFR181WH6327XTSA1 provides 70 at 5mA, 8V. BFP405H6740XTSA1 provides 60 at 5mA, 4V. BFP640FESDH6327XTSA1 provides 110 at 30mA, 3V. BFR460L3E6327XTMA1 provides 90 at 20mA, 3V. KSP10TA provides 60 at 4mA, 10V. Higher hFE values indicate improved current amplification capability.

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