BB170X Equivalent & Substitute Parts Reference

Part Overview

The BB170X is a varactor diode manufactured by NXP USA Inc., designed for VHF applications with a peak reverse voltage rating of 30 V. It is packaged in SOD-323 surface mount configuration and is currently in active production status. The BB170X serves as a voltage-variable capacitance element in RF and microwave circuits requiring precise capacitance tuning.

Substitute parts become necessary when the BB170X reaches end-of-life status, when supply constraints occur, or when design requirements allow for alternative electrical characteristics within acceptable tolerance ranges. The substitute parts listed maintain compatibility through equivalent packaging, operating temperature ranges, and core electrical parameters.

Substiute Parts

BB170X

NXP USA Inc.In Stock: 6269BB170X Datasheet

Current PartRFQ

BB439E6327HTSA1

Infineon TechnologiesIn Stock: 27391BB439E6327HTSA1 Datasheet

MFR RecommendedRFQ

BB639E7904HTSA1

Infineon TechnologiesIn Stock: 80441BB639E7904HTSA1 Datasheet

MFR RecommendedRFQ

BB640E6327HTSA1

Infineon TechnologiesIn Stock: 3236BB640E6327HTSA1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BB170X is determined by the following criteria:

Mandatory Compatibility Parameters:

• Package / Case: SC-76, SOD-323 (surface mount)
• Diode Type: Single
• Voltage - Peak Reverse (Max): 30 V or higher
• Operating Temperature Range: Must support -55°C minimum and 125°C minimum
• RoHS Status: ROHS3 Compliant
• Mounting Type: Surface Mount

Electrical Performance Parameters (Allowable Variation):

• Capacitance @ Vr, F: Nominal value 2.75 pF @ 28 V, 1 MHz (substitutes may vary within application tolerance)
• Capacitance Ratio: Nominal value 15 (substitutes may vary based on tuning range requirements)

All three substitute parts meet the mandatory compatibility criteria. Variations in capacitance values and ratios are acceptable provided the application circuit design accommodates the specified electrical characteristics of the selected substitute.

Parameter Comparison

Engineering Selection Recommendations

BB439E6327HTSA1 (Infineon Technologies): This substitute is electrically distinct from the BB170X due to its lower peak reverse voltage rating (28 V versus 30 V) and significantly higher capacitance value (6 pF @ 25 V). The capacitance ratio of 8 differs substantially from the BB170X ratio of 15. This part is marked "Not For New Designs" and should be selected only when circuit design parameters explicitly accommodate these electrical differences. The operating temperature range matches the BB170X at -55°C to 125°C.

BB639E7904HTSA1 (Infineon Technologies): This substitute provides the closest electrical alignment with the BB170X. Both maintain 30 V peak reverse voltage ratings and similar capacitance values (2.9 pF @ 28 V versus 2.75 pF @ 28 V). The capacitance ratio of 14.7 closely matches the BB170X ratio of 15. This part offers an extended operating temperature range to 150°C. Product status is "Not For New Designs."

BB640E6327HTSA1 (Infineon Technologies): This substitute maintains the 30 V peak reverse voltage rating but exhibits a higher capacitance value (3.3 pF @ 28 V) and a significantly higher capacitance ratio (25 versus 15). The extended operating temperature range to 150°C provides thermal margin beyond the BB170X specification. Product status is "Not For New Designs."

All substitute parts maintain RoHS3 compliance, MSL Level 1 rating, and SOD-323 surface mount packaging. Selection should be based on circuit-specific requirements for capacitance tuning range and voltage headroom.

Frequently Asked Questions (FAQ)

Q: Can BB439E6327HTSA1 be used as a direct replacement for BB170X?

A: BB439E6327HTSA1 differs in peak reverse voltage (28 V versus 30 V) and capacitance characteristics (6 pF @ 25 V versus 2.75 pF @ 28 V). Direct substitution is not recommended without circuit analysis confirming that the lower voltage rating and higher capacitance value are acceptable for the application.

Q: Which substitute part most closely matches the BB170X electrical performance?

A: BB639E7904HTSA1 provides the closest electrical alignment, with matching 30 V peak reverse voltage and nearly identical capacitance values (2.9 pF @ 28 V versus 2.75 pF @ 28 V) and capacitance ratios (14.7 versus 15).

Q: Are all substitute parts compatible with the same PCB footprint as BB170X?

A: Yes. All substitute parts use the SC-76, SOD-323 package and surface mount configuration, ensuring mechanical and footprint compatibility with BB170X designs.

Q: What does "Not For New Designs" status mean for the substitute parts?

A: This status indicates that the manufacturer is not recommending these parts for new circuit designs. However, they remain available for existing designs and applications where they have been qualified. Substitution decisions should account for long-term supply availability.

Q: Do the substitute parts maintain the same temperature operating range as BB170X?

A: BB439E6327HTSA1 matches the BB170X range of -55°C to 125°C. BB639E7904HTSA1 and BB640E6327HTSA1 extend the upper limit to 150°C, providing additional thermal margin.

Q: Are all parts RoHS3 compliant?

A: Yes. The BB170X and all three substitute parts are ROHS3 compliant with MSL Level 1 (Unlimited) moisture sensitivity rating.