F1385NBGI8 Equivalent & Substitute Parts

Part Overview

The F1385NBGI8 is an RF Demodulator IC manufactured by Renesas Electronics Corporation, designed for operation in the 3.2GHz to 4.4GHz RF frequency band with a local oscillator frequency range of 2.85GHz to 4.05GHz. The device is packaged in a 36-WFQFN Exposed Pad surface mount configuration with a footprint of 6.00 x 6.00 x 0.80 mm.

The F1385NBGI8 is classified as Obsolete. Locating equivalent or substitute RF demodulator ICs becomes necessary when the original part reaches end-of-life status, inventory becomes depleted, or design requirements necessitate alternative performance characteristics. Substitute parts must maintain functional compatibility within the RF frequency band, supply voltage range, and mounting type while accommodating differences in package geometry and electrical performance parameters.

Key Parameters

Parameter	F1385NBGI8 Value
Function	Demodulator
RF Frequency Range	3.2GHz ~ 4.4GHz
LO Frequency Range	2.85GHz ~ 4.05GHz
Gain	20dB
Noise Figure	20dB
P1dB	0dBm
Supply Voltage	4.75V ~ 5.25V
Supply Current	210 mA
Package / Case	36-WFQFN Exposed Pad
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the F1385NBGI8 is determined by the following critical parameters:

RF Frequency Band Overlap: The substitute part must support RF frequency operation that encompasses or overlaps with the 3.2GHz to 4.4GHz band of the original part.

LO Frequency Compatibility: The local oscillator frequency range of the substitute must accommodate the demodulation requirements within the target RF band.

Supply Voltage Compatibility: The substitute must operate within or be compatible with the 4.75V to 5.25V supply voltage range.

Mounting Type: Surface mount technology is required to maintain PCB integration compatibility.

Package Compatibility: While the original part uses a 36-WFQFN package, substitute parts may use alternative surface mount packages (24-WFQFN, 16-WQFN, 28-WFQFN, or 48-VFQFN) provided that the footprint can be accommodated within the application's PCB layout constraints.

Functional Classification: All substitute parts must be RF demodulator ICs with equivalent signal processing functionality.

The following substitute parts meet these criteria with varying degrees of frequency band coverage and performance characteristics:

ADL5380ACPZ-R7: Broadband coverage (400MHz ~ 6GHz) encompasses the target band
ADL5387ACPZ-R7: Partial coverage (30MHz ~ 2GHz) does not fully encompass the target band
LT5546EUF#TRPBF: Narrowband coverage (40MHz ~ 500MHz) does not encompass the target band
MAX2306ETI+: Narrowband coverage (40MHz ~ 300MHz) does not encompass the target band
TRF3710IRGZT: Partial coverage (1.7GHz ~ 2GHz) does not encompass the target band
TRF371135IRGZT: Broadband coverage (1.7GHz ~ 6GHz) encompasses the target band

Parameter Comparison

Parameter	F1385NBGI8	ADL5380ACPZ-R7	ADL5387ACPZ-R7	LT5546EUF#TRPBF	MAX2306ETI+	TRF3710IRGZT	TRF371135IRGZT
Function	Demodulator	Demodulator	Demodulator	Demodulator	Demodulator	Demodulator	Demodulator
RF Frequency Range	3.2GHz ~ 4.4GHz	400MHz ~ 6GHz	30MHz ~ 2GHz	40MHz ~ 500MHz	40MHz ~ 300MHz	1.7GHz ~ 2GHz	1.7GHz ~ 6GHz
LO Frequency Range	2.85GHz ~ 4.05GHz	400MHz ~ 6GHz	100MHz ~ 4GHz	80MHz ~ 1GHz	40MHz ~ 300MHz	1.7GHz ~ 2GHz	1.7GHz ~ 6GHz
Gain	20dB	6.9dB	3.8dB	—	—	45dB	45dB
Noise Figure	20dB	10.9dB	16.5dB	7.8dB	6.36dB	14.5dB	17.5dB
P1dB	0dBm	11.6dBm	12.8dBm	-10dBm	-9dBm	—	3dBV
Supply Voltage	4.75V ~ 5.25V	4.75V ~ 5.25V	4.75V ~ 5.25V	1.8V ~ 5.25V	2.7V	4.5V ~ 5.5V	4.5V ~ 5.5V
Supply Current	210 mA	245 mA	180 mA	24 mA	41.5 mA	360 mA	370 mA
Package / Case	36-WFQFN Exposed Pad	24-WFQFN Exposed Pad, CSP	24-VFQFN Exposed Pad, CSP	16-WQFN Exposed Pad	28-WFQFN Exposed Pad	48-VFQFN Exposed Pad	48-VFQFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	2 (1 Year)

Engineering Selection Recommendations

Primary Substitutes with Full RF Band Coverage:

The ADL5380ACPZ-R7 and TRF371135IRGZT provide RF frequency coverage that fully encompasses the 3.2GHz to 4.4GHz operating band of the F1385NBGI8. Both parts are classified as Active products with ROHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory compliance.

The ADL5380ACPZ-R7 operates with a supply voltage range of 4.75V to 5.25V, matching the original part specification. The TRF371135IRGZT operates within 4.5V to 5.5V, which overlaps the original specification range. Both parts are surface mount devices suitable for PCB integration.

Secondary Substitutes with Partial RF Band Coverage:

The ADL5387ACPZ-R7 provides RF frequency coverage up to 2GHz, which does not fully encompass the 3.2GHz to 4.4GHz band. The TRF3710IRGZT operates within 1.7GHz to 2GHz, also providing incomplete coverage. These parts are suitable only for applications where the RF signal operates within their respective frequency ranges.

Narrowband Substitutes:

The LT5546EUF#TRPBF, MAX2306ETI+, and ADL5387ACPZ-R7 are narrowband demodulators with RF frequency coverage below 2GHz. These parts are not suitable for direct substitution in applications requiring 3.2GHz to 4.4GHz operation.

Compliance and Availability:

All substitute parts listed are ROHS3 compliant and REACH unaffected. All substitute parts are classified as Active products, ensuring continued manufacturing and availability. Moisture sensitivity levels vary; parts with MSL ratings of 1 or 2 provide more favorable handling conditions compared to MSL 3 rated parts.

Frequently Asked Questions (FAQ)

Q: Can the ADL5380ACPZ-R7 directly replace the F1385NBGI8 in a 3.2GHz to 4.4GHz application?

A: The ADL5380ACPZ-R7 provides RF frequency coverage of 400MHz to 6GHz, which encompasses the 3.2GHz to 4.4GHz band. The supply voltage range of 4.75V to 5.25V matches the original part. However, the package differs (24-WFQFN versus 36-WFQFN), requiring PCB layout modification. Electrical performance characteristics differ; the ADL5380ACPZ-R7 provides 6.9dB gain compared to 20dB for the original part.

Q: What is the significance of the package size difference between the F1385NBGI8 and substitute parts?

A: The F1385NBGI8 uses a 36-pin WFQFN package with a 6.00 x 6.00 mm footprint. Substitute parts use 24-pin, 16-pin, 28-pin, or 48-pin packages with different footprints. PCB layout redesign is required to accommodate the alternative package geometry. Pin assignments and signal routing differ between packages and must be verified against device datasheets.

Q: Which substitute part provides the closest electrical performance match to the F1385NBGI8?

A: The TRF371135IRGZT provides RF frequency coverage of 1.7GHz to 6GHz, encompassing the target band, with a gain of 45dB compared to 20dB for the original part. The ADL5380ACPZ-R7 provides broader frequency coverage with lower gain of 6.9dB. Neither part provides an exact electrical performance match; application-specific requirements determine the most suitable substitute.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements equivalent to the original F1385NBGI8.

Q: What is the impact of different supply current ratings on system design?

A: The F1385NBGI8 draws 210 mA at nominal supply voltage. Substitute parts range from 24 mA (LT5546EUF#TRPBF) to 370 mA (TRF371135IRGZT). Power supply design, thermal management, and current delivery capacity must be evaluated for each substitute part. Higher current consumption requires larger power supply capacity and may increase thermal dissipation requirements.

Q: Can narrowband demodulators such as MAX2306ETI+ or LT5546EUF#TRPBF substitute for the F1385NBGI8?

A: The MAX2306ETI+ operates at 40MHz to 300MHz and the LT5546EUF#TRPBF operates at 40MHz to 500MHz. Neither part covers the 3.2GHz to 4.4GHz RF frequency band required by the F1385NBGI8. These parts are suitable only for applications operating at their respective frequency ranges and cannot substitute for the original part in C-band or higher frequency applications.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings in the substitute parts?

A: The F1385NBGI8 has an MSL rating of 1 (Unlimited), indicating no moisture sensitivity restrictions. Substitute parts with MSL ratings of 2 or 3 require controlled storage and handling conditions. MSL 3 parts (ADL5380ACPZ-R7, ADL5387ACPZ-R7, TRF3710IRGZT) must be stored in dry conditions and have a 168-hour floor life after moisture exposure. MSL 2 parts (TRF371135IRGZT) have a 1-year floor life. These requirements impact supply chain management and manufacturing processes.

Q: Is the TRF371135IRGZT suitable for the F1385NBGI8 application?

A: The TRF371135IRGZT provides RF frequency coverage of 1.7GHz to 6GHz, encompassing the 3.2GHz to 4.4GHz band. The supply voltage range of 4.5V to 5.5V overlaps the original specification. The package is 48-VFQFN, requiring PCB redesign. Gain is 45dB compared to 20dB for the original part. The part is Active status with ROHS3 compliance. Suitability depends on application-specific gain and noise figure requirements.

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