RF Directional Coupler HHM2909C4 Equivalent & Substitute Parts

Part Overview

The HHM2909C4 is an RF directional coupler manufactured by TDK Corporation, designed for general purpose applications across dual frequency bands: 777MHz to 925MHz and 1.71GHz to 1.91GHz. This component operates at a coupling factor of 21.4dB with 0.6dB insertion loss and 32dB isolation in a compact 0402 (1005 Metric) surface mount package. The product status is obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

HHM2909C4

TDK CorporationIn Stock: 3317HHM2909C4 Datasheet

Current PartRFQ

CP0402W2700FNTR

KYOCERA AVXIn Stock: 35515CP0402W2700FNTR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for RF directional couplers is determined by the following critical parameters:

Package Compatibility: Both the main part and substitute must use the 0402 (1005 Metric) surface mount package to ensure mechanical and electrical compatibility with existing PCB layouts.

Frequency Coverage: The substitute frequency range must encompass or exceed the operational bands of the original part. The HHM2909C4 operates at 777MHz ~ 925MHz and 1.71GHz ~ 1.91GHz. A substitute with broader frequency coverage (700MHz ~ 2.7GHz) satisfies this requirement by containing both original frequency bands within its operational range.

Electrical Performance: Coupling factor, insertion loss, isolation, and return loss must meet or exceed the specifications of the original part to maintain circuit performance. The substitute part CP0402W2700FNTR provides improved electrical characteristics across these parameters.

Moisture Sensitivity: Both parts maintain MSL 1 (Unlimited) rating, ensuring equivalent handling and storage requirements.

Parameter Comparison

Engineering Selection Recommendations

The CP0402W2700FNTR from KYOCERA AVX is a direct substitute for the obsolete HHM2909C4. Both components share identical package geometry (0402 / 1005 Metric) and moisture sensitivity classification, ensuring PCB compatibility and equivalent handling requirements.

The substitute part demonstrates superior electrical performance: improved coupling factor (24dB vs 21.4dB), reduced insertion loss (0.3dB vs 0.6dB), and enhanced return loss (18dB vs 15.56dB). The broader frequency coverage (700MHz ~ 2.7GHz) encompasses the original part's dual operating bands while extending capability to adjacent frequency ranges.

The CP0402W2700FNTR maintains active product status with ROHS3 compliance and REACH unaffected designation, providing long-term availability and regulatory alignment for new designs and production continuity.

Frequently Asked Questions (FAQ)

Q: Can the CP0402W2700FNTR replace the HHM2909C4 in existing designs?

A: Yes. Both components use identical 0402 (1005 Metric) surface mount packages with matching pin configurations for RF directional couplers. Electrical performance of the substitute meets or exceeds the original part across all specified parameters.

Q: What is the frequency coverage difference between these parts?

A: The HHM2909C4 operates at 777MHz ~ 925MHz and 1.71GHz ~ 1.91GHz. The CP0402W2700FNTR operates at 700MHz ~ 2.7GHz, which encompasses both original frequency bands and extends coverage to adjacent frequencies. This broader range does not affect compatibility in applications using the original frequency bands.

Q: How do the electrical characteristics compare?

A: The substitute part provides improved performance: coupling factor increases from 21.4dB to 24dB, insertion loss decreases from 0.6dB to 0.3dB, and return loss improves from 15.56dB to 18dB. These enhancements maintain circuit functionality while reducing signal loss.

Q: Are there any compliance or regulatory differences?

A: The CP0402W2700FNTR is ROHS3 compliant and REACH unaffected, providing regulatory alignment for current manufacturing standards. The HHM2909C4 compliance status is not specified due to its obsolete status.

Q: What is the moisture sensitivity requirement for both parts?

A: Both components maintain MSL 1 (Unlimited) classification, indicating identical moisture sensitivity levels and equivalent handling, storage, and reflow requirements.

Q: Why is the HHM2909C4 listed as obsolete?

A: Product obsolescence indicates the manufacturer has discontinued production. The CP0402W2700FNTR maintains active status with confirmed inventory availability, ensuring reliable procurement for current and future applications.