1SV305,H3F Varactor Diode Equivalent & Substitute Parts

Part Overview

The 1SV305,H3F is a single varactor diode manufactured by Toshiba Semiconductor and Storage, designed for surface mount applications in the SC-79/SOD-523 package. This active product operates at a peak reverse voltage of 10 V with a capacitance of 6.6 pF at 4 V and 1 MHz, featuring a capacitance ratio of 3 (C1/C4). The device is classified as moisture sensitivity level 1 (unlimited) and complies with RoHS3 standards. Equivalent and substitute parts are identified based on matching electrical characteristics, package compatibility, and operational parameters to support component procurement flexibility and supply chain continuity.

Key Parameters

Parameter	Value
Manufacturer	Toshiba Semiconductor and Storage
Part Number	1SV305,H3F
Category	Diodes - Varactor
Diode Type	Single
Package / Case	SC-79, SOD-523
Mounting Type	Surface Mount
Voltage - Peak Reverse (Max)	10 V
Capacitance @ Vr, F	6.6 pF @ 4 V, 1 MHz
Capacitance Ratio	3 (C1/C4)
Operating Temperature	125°C (TJ)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Active

Substitute Part Grouping Explanation

Substitution eligibility for the 1SV305,H3F is determined by the following criteria:

Primary Matching Parameters:

Voltage - Peak Reverse (Max): 10 V
Package / Case: SC-79 or SOD-523
Diode Type: Single
Mounting Type: Surface Mount
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters:

Capacitance range and ratio characteristics
Operating temperature range
RoHS3 compliance status

All identified substitute parts meet the primary matching parameters. Variations in capacitance values and capacitance ratios are acceptable within the varactor diode category, as these parameters are application-dependent and do not prevent functional substitution in circuits designed for varactor tuning applications.

Parameter Comparison

Part Number	Manufacturer	Capacitance @ Vr, F	Capacitance Ratio	Voltage - Peak Reverse (Max)	Operating Temperature	Package / Case	MSL	Product Status
1SV305,H3F	Toshiba Semiconductor and Storage	6.6 pF @ 4 V, 1 MHz	3 (C1/C4)	10 V	125°C (TJ)	SC-79, SOD-523	1 (Unlimited)	Active
BB208-02,115	NXP USA Inc.	5.4 pF @ 7.5 V, 1 MHz	5.2 (C1/C7.5)	10 V	-55°C ~ 125°C (TJ)	SC-79, SOD-523	1 (Unlimited)	Active
BBY5602VH6327XTSA1	Infineon Technologies	12.1 pF @ 4 V, 1 MHz	3.3 (C1/C3)	10 V	-55°C ~ 150°C (TJ)	SC-79, SOD-523	1 (Unlimited)	Active
BBY5702VH6327XTSA1	Infineon Technologies	5.5 pF @ 4 V, 1 MHz	4.5 (C1/C4)	10 V	-55°C ~ 125°C (TJ)	SC-79, SOD-523	1 (Unlimited)	Active
SMV1276-079LF	Skyworks Solutions Inc.	2.35 pF @ 4 V, 1 MHz	2 (C1/C4)	10 V	-55°C ~ 125°C (TJ)	SC-79, SOD-523	1 (Unlimited)	Active
SMV1763-079LF	Skyworks Solutions Inc.	2.9 pF @ 2.5 V, 1 MHz	2.7 (C0.5/C2.5)	10 V	-55°C ~ 125°C (TJ)	SC-79, SOD-523	1 (Unlimited)	Active

Engineering Selection Recommendations

All identified substitute parts are active products with RoHS3 compliance status. Selection among these alternatives should be based on the specific capacitance and capacitance ratio requirements of the target application.

Capacitance-Matched Substitutes:

BBY5602VH6327XTSA1 (Infineon) provides the highest capacitance at 12.1 pF @ 4 V with a capacitance ratio of 3.3, closest to the original 1SV305,H3F ratio of 3.
BBY5702VH6327XTSA1 (Infineon) offers 5.5 pF @ 4 V with a capacitance ratio of 4.5, suitable for applications requiring moderate capacitance values.

Lower Capacitance Alternatives:

SMV1276-079LF (Skyworks) and SMV1763-079LF (Skyworks) provide lower capacitance values (2.35 pF and 2.9 pF respectively) for applications requiring reduced tuning range.
BB208-02,115 (NXP) offers 5.4 pF @ 7.5 V with an extended operating temperature range of -55°C to 125°C.

All substitute parts maintain the 10 V peak reverse voltage specification and SC-79/SOD-523 package compatibility required for direct board-level replacement.

Frequently Asked Questions (FAQ)

Q: Can the 1SV305,H3F be directly replaced with any of these substitute parts?

A: Direct replacement is possible from a package and voltage perspective, as all substitutes use the SC-79/SOD-523 package and support 10 V peak reverse voltage. However, circuit performance depends on capacitance matching. Applications sensitive to specific capacitance values or capacitance ratios require evaluation of the substitute part's electrical characteristics against circuit design specifications.

Q: What is the significance of capacitance ratio in varactor diode substitution?

A: The capacitance ratio (C1/Cn) defines the tuning range of the varactor diode across its operating voltage range. The 1SV305,H3F has a ratio of 3 (C1/C4), meaning capacitance at 1 V is three times the capacitance at 4 V. Substitute parts with different ratios will exhibit different tuning characteristics and may require circuit adjustment.

Q: Are all substitute parts suitable for high-temperature applications?

A: The 1SV305,H3F operates to 125°C (TJ). BBY5602VH6327XTSA1 (Infineon) extends to 150°C (TJ), providing additional thermal margin. Other substitutes operate to 125°C or -55°C to 125°C, matching or exceeding the original specification.

Q: Do all substitute parts have the same moisture sensitivity level?

A: Yes, all identified substitute parts are classified as MSL 1 (Unlimited), matching the original 1SV305,H3F specification. This indicates no moisture sensitivity restrictions for storage or handling.

Q: Which substitute offers the closest electrical match to the 1SV305,H3F?

A: BBY5602VH6327XTSA1 (Infineon) provides the closest match with a capacitance of 12.1 pF @ 4 V and a capacitance ratio of 3.3, compared to the original 6.6 pF @ 4 V and ratio of 3. This part is suitable for applications where capacitance scaling is acceptable within circuit design tolerances.

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