F1385NBGI RF Demodulator IC Equivalent & Substitute Parts

Part Overview

The F1385NBGI is an RF demodulator integrated circuit manufactured by Renesas Electronics Corporation, designed for operation in the 3.2 GHz to 4.4 GHz frequency band. This 36-pin WFQFN surface mount device provides demodulation functionality with 20 dB gain and 20 dB noise figure characteristics. The F1385NBGI is classified as obsolete product status, necessitating identification of equivalent and substitute components for ongoing design support and procurement requirements.

Substiute Parts

F1385NBGI

Renesas Electronics CorporationIn Stock: 845F1385NBGI Datasheet

Current PartRFQ

F1358NBGI

Renesas Electronics CorporationIn Stock: 1415F1358NBGI Datasheet

MFR RecommendedRFQ

ADRF6850BCPZ

Analog Devices Inc.In Stock: 2169ADRF6850BCPZ Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the F1385NBGI are identified based on functional equivalence within the RF demodulator category and compatibility across critical electrical and mechanical parameters. The substitution logic is structured into two categories:

Manufacturer Recommended Substitute (Primary): The F1358NBGI represents the primary substitute option, maintaining the same manufacturer (Renesas Electronics Corporation), identical package format (36-WFQFN Exposed Pad), compatible supply voltage range (4.75 V ~ 5.25 V), and active product status. This part operates within an overlapping RF frequency band (3.2 GHz ~ 4 GHz) and shares identical mounting technology and compliance certifications.

Similar Functional Substitute (Secondary): The ADRF6850BCPZ from Analog Devices Inc. provides demodulator functionality with different frequency specifications (100 MHz ~ 1 GHz RF band), alternative package format (56-VFQFN Exposed Pad, CSP), and different supply voltage requirement (3.3 V). This part is suitable only for applications where frequency band compatibility is not a primary constraint.

Substitution eligibility is determined by: function classification (demodulator), package compatibility (surface mount WFQFN format), supply voltage compatibility, and frequency band overlap with the original application requirements.

Parameter Comparison

Engineering Selection Recommendations

F1358NBGI Selection Criteria: This part is the primary substitute for the F1385NBGI based on active product status, identical package footprint (36-VFQFPN 6x6), matching supply voltage specifications (4.75 V ~ 5.25 V), and ROHS3 compliance. The F1358NBGI operates within the overlapping RF frequency band (3.2 GHz ~ 4 GHz), covering the lower portion of the original part's frequency range. Supply current requirements are comparable (216 mA versus 210 mA). This substitute is suitable for applications where the RF frequency band does not exceed 4 GHz and where the reduced gain specification (11 dB versus 20 dB) is acceptable for the circuit design.

ADRF6850BCPZ Selection Criteria: This part provides demodulator functionality with active product status and ROHS3 compliance. However, the ADRF6850BCPZ operates in a fundamentally different frequency band (100 MHz ~ 1 GHz), requiring complete circuit redesign and is not suitable as a direct substitute for applications requiring 3.2 GHz to 4.4 GHz operation. The different supply voltage (3.3 V), larger package footprint (56-LFCSP-VQ 8x8), higher supply current (350 mA), and MSL rating of 3 introduce additional design constraints. This part is applicable only for new designs operating in the 100 MHz to 1 GHz frequency range.

Compliance and Availability: Both substitute parts maintain ROHS3 compliance and REACH unaffected status, consistent with the original F1385NBGI specifications. The F1358NBGI offers superior availability with 1391 pieces in stock compared to the F1385NBGI's 753 pieces, supporting procurement continuity for obsolete product replacement.

Frequently Asked Questions (FAQ)

Q: Can the F1358NBGI directly replace the F1385NBGI in existing designs?

A: The F1358NBGI provides direct pin-compatible replacement within the same 36-VFQFPN package footprint and identical supply voltage range. However, the reduced RF frequency upper limit (4 GHz versus 4.4 GHz) and lower gain specification (11 dB versus 20 dB) require circuit-level verification to confirm compatibility with specific application requirements.

Q: What are the key differences between the F1358NBGI and F1385NBGI?

A: The primary differences are RF frequency range (3.2 GHz ~ 4 GHz for F1358NBGI versus 3.2 GHz ~ 4.4 GHz for F1385NBGI), gain specification (11 dB versus 20 dB), LO frequency range (1.4 GHz ~ 3.8 GHz versus 2.85 GHz ~ 4.05 GHz), and product status (active versus obsolete). Supply voltage, package format, and mounting type remain identical.

Q: Is the ADRF6850BCPZ suitable as a substitute for the F1385NBGI?

A: The ADRF6850BCPZ is not suitable as a direct substitute due to incompatible frequency specifications (100 MHz ~ 1 GHz versus 3.2 GHz ~ 4.4 GHz), different supply voltage requirement (3.3 V versus 4.75 V ~ 5.25 V), and larger package footprint (56-LFCSP-VQ 8x8 versus 36-VFQFPN 6x6). This part is applicable only for new designs in the lower frequency band.

Q: What packaging considerations apply to these demodulator ICs?

A: The F1385NBGI and F1358NBGI share identical 36-VFQFPN (6x6) package dimensions and exposed pad configuration, enabling direct PCB footprint compatibility. The ADRF6850BCPZ requires a larger 56-LFCSP-VQ (8x8) footprint, necessitating PCB redesign. All three parts are surface mount devices with MSL ratings of 1 or 3, requiring appropriate moisture control during storage and handling.

Q: How do the electrical performance specifications compare?

A: The F1358NBGI provides improved noise figure (19 dB versus 20 dB) but reduced gain (11 dB versus 20 dB) compared to the F1385NBGI. The ADRF6850BCPZ offers superior noise figure (11 dB) and gain (60 dB) but operates in a different frequency band entirely. Selection depends on specific application requirements for gain, noise performance, and frequency of operation.

Q: Are all three parts RoHS compliant?

A: Yes, all three parts (F1385NBGI, F1358NBGI, and ADRF6850BCPZ) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.