KSC1393RTA Equivalent & Substitute Parts

Part Overview

The KSC1393RTA is an RF transistor NPN manufactured by onsemi, rated for 30V collector-emitter breakdown voltage with a transition frequency of 700MHz and maximum power dissipation of 250mW. This device is packaged in a through-hole TO-92-3 configuration and is classified as obsolete. Due to its obsolete status, equivalent substitute parts are necessary for new designs and ongoing production requirements. The substitute parts listed maintain core RF transistor functionality while offering alternative packaging, frequency performance, and active product status.

Key Parameters

Parameter	KSC1393RTA
Transistor Type	NPN
Voltage - Collector Emitter Breakdown (Max)	30V
Frequency - Transition	700MHz
Power - Max	250mW
Current - Collector (Ic) (Max)	20mA
DC Current Gain (hFE) (Min)	40 @ 2mA, 10V
Noise Figure (dB Typ @ f)	2dB ~ 3dB @ 200MHz
Gain	20dB ~ 24dB
Operating Temperature (TJ)	150°C
Mounting Type	Through Hole
Package / Case	TO-92-3
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the KSC1393RTA is determined by the following core parameters: transistor type (NPN), operating temperature range (150°C maximum junction temperature), and RF performance characteristics including transition frequency, power dissipation capability, and noise figure. All substitute parts maintain NPN transistor type and 150°C maximum operating temperature.

The substitute parts differ significantly in the following parameters:

Voltage Rating: Substitute parts operate at lower maximum collector-emitter breakdown voltages (4.7V to 5.5V) compared to the KSC1393RTA (30V)
Frequency Performance: Substitute parts offer substantially higher transition frequencies (18GHz to 46GHz) compared to the KSC1393RTA (700MHz)
Mounting Technology: Substitute parts use surface-mount packaging (SOT-343, 4-DFP) instead of through-hole TO-92-3
Current Handling: Substitute parts support higher maximum collector currents (35mA to 100mA) compared to the KSC1393RTA (20mA)
Power Dissipation: Substitute parts range from 160mW to 230mW, comparable to or slightly lower than the KSC1393RTA (250mW)

Substitution is valid only when the application requirements permit operation at lower voltage ratings and when the higher frequency performance of substitute parts does not introduce design complications.

Parameter Comparison

Parameter	KSC1393RTA	BF776H6327XTSA1	BFP420H6740XTSA1	BFU690F,115
Manufacturer	onsemi	Infineon Technologies	Infineon Technologies	NXP USA Inc.
Transistor Type	NPN	NPN	NPN	NPN
Voltage - Collector Emitter Breakdown (Max)	30V	4.7V	5V	5.5V
Frequency - Transition	700MHz	46GHz	25GHz	18GHz
Power - Max	250mW	200mW	160mW	230mW
Current - Collector (Ic) (Max)	20mA	50mA	35mA	100mA
DC Current Gain (hFE) (Min)	40 @ 2mA, 10V	180 @ 30mA, 3V	60 @ 20mA, 4V	90 @ 20mA, 2V
Operating Temperature (TJ)	150°C	150°C	150°C	150°C
Mounting Type	Through Hole	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-92-3	SOT-343	SOT-343	SOT-343F
Product Status	Obsolete	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Product Status Consideration: The KSC1393RTA is classified as obsolete. All three substitute parts (BF776H6327XTSA1, BFP420H6740XTSA1, BFU690F,115) maintain active product status, ensuring long-term availability and continued manufacturer support.

Compliance and Certifications: All substitute parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements. The KSC1393RTA product status information does not specify RoHS compliance.

Voltage Rating Compatibility: Selection of a substitute part requires verification that the application circuit operates at or below the substitute part's maximum collector-emitter breakdown voltage. The KSC1393RTA operates at 30V maximum, while substitutes operate at 4.7V to 5.5V maximum. Applications designed for 30V operation require circuit redesign or alternative substitutes with higher voltage ratings.

Frequency Performance: Substitute parts offer transition frequencies significantly higher than the KSC1393RTA. Applications operating at 700MHz or below can utilize substitute parts without frequency-related performance degradation. Applications requiring operation specifically at 700MHz should verify that the substitute part's higher frequency capability does not introduce unwanted oscillation or stability issues in the specific circuit topology.

Packaging Transition: Migration from through-hole TO-92-3 to surface-mount SOT-343 or 4-DFP packages requires PCB redesign and assembly process modification. This transition is necessary for modern manufacturing but introduces design and qualification effort.

Current and Power Handling: All substitute parts support higher maximum collector currents and comparable power dissipation, providing design margin for applications within the KSC1393RTA's original current specifications.

Frequently Asked Questions (FAQ)

Q: Can the BF776H6327XTSA1 directly replace the KSC1393RTA in an existing circuit?

A: Direct replacement is not possible without circuit modification. The BF776H6327XTSA1 has a maximum collector-emitter breakdown voltage of 4.7V compared to the KSC1393RTA's 30V. If the circuit operates above 4.7V, the substitute part will fail. Additionally, the BF776H6327XTSA1 uses surface-mount SOT-343 packaging while the KSC1393RTA uses through-hole TO-92-3 packaging, requiring PCB redesign.

Q: Which substitute part is most similar to the KSC1393RTA in terms of voltage rating?

A: None of the substitute parts match the KSC1393RTA's 30V voltage rating. The BFU690F,115 offers the highest voltage rating at 5.5V among the substitutes. For applications requiring 30V operation, alternative parts with higher voltage ratings must be sourced.

Q: Are all substitute parts suitable for RF applications at 700MHz?

A: Yes. All substitute parts have transition frequencies equal to or greater than 700MHz (18GHz, 25GHz, and 46GHz respectively), indicating capability for RF operation at 700MHz and above. However, the specific circuit topology and impedance matching requirements must be verified for each substitute part.

Q: What is the primary advantage of using BFU690F,115 over the other substitutes?

A: The BFU690F,115 supports the highest maximum collector current (100mA) among the substitutes and offers the highest power dissipation (230mW), closest to the KSC1393RTA's 250mW rating. This part is suitable for applications requiring higher current handling within the lower voltage constraint.

Q: Do all substitute parts meet current regulatory compliance requirements?

A: Yes. All three substitute parts are ROHS3 compliant and REACH unaffected. The KSC1393RTA's compliance status is not specified in the provided data.

Q: What is the impact of transitioning from through-hole to surface-mount packaging?

A: Surface-mount packaging requires PCB redesign with appropriate land patterns for SOT-343 or 4-DFP packages, modification of assembly processes, and potential changes to thermal management strategies. Through-hole components typically offer easier manual rework and repair compared to surface-mount devices.

Q: Can the substitute parts operate at the KSC1393RTA's maximum operating temperature of 150°C?

A: Yes. All substitute parts are rated for 150°C maximum junction temperature, matching the KSC1393RTA's thermal specification.

Q: Which substitute part offers the best noise figure performance?

A: The BFU690F,115 offers the lowest noise figure at 0.6dB to 0.7dB at 1.5GHz to 2.4GHz. The BF776H6327XTSA1 provides 0.8dB to 1.3dB at 1.8GHz to 6GHz. The KSC1393RTA specifies 2dB to 3dB at 200MHz. Noise figure comparison across different frequency ranges requires application-specific evaluation.

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