HHM1908A1 RF Balun Equivalent & Substitute Parts

Part Overview

The HHM1908A1 is an RF Balun manufactured by TDK Corporation, designed for 4.9GHz to 5.95GHz applications with 50/100Ohm impedance matching. This component operates at a higher frequency band compared to earlier series variants and is classified as obsolete. Due to its obsolete status and limited remaining inventory (874 Pcs), identifying functionally compatible substitute parts is necessary for ongoing design support and production continuity.

Substiute Parts

HHM1908A1

TDK CorporationIn Stock: 892HHM1908A1 Datasheet

Current PartRFQ

HHM1903A1

TDK CorporationIn Stock: 10211HHM1903A1 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HHM1908A1 is determined by the following critical parameters:

Mandatory Matching Parameters:

• Manufacturer: TDK Corporation (HHM series)
• Impedance: 50 / 100Ohm
• Phase Difference: 180° ±10°
• Package / Case: 0402 (1005 Metric)
• Mounting Type: Surface Mount
• Moisture Sensitivity Level: 1 (Unlimited)

Frequency Band Consideration: The HHM1908A1 operates in the 4.9GHz to 5.95GHz band. Substitute parts may operate in different frequency ranges provided all other electrical and mechanical parameters remain compatible. Frequency band differences require application-level validation based on system requirements.

Performance Tolerance: Insertion Loss and Return Loss specifications may vary between substitute parts within acceptable engineering margins for RF balun applications.

Parameter Comparison

Engineering Selection Recommendations

HHM1903A1 Substitution Criteria:

The HHM1903A1 shares identical mechanical packaging, impedance characteristics, phase difference tolerance, and moisture sensitivity classification with the HHM1908A1. Both components are manufactured by TDK Corporation within the HHM series and are classified as obsolete products.

The primary difference is frequency band operation: HHM1903A1 operates at 2.4GHz to 2.5GHz versus HHM1908A1 at 4.9GHz to 5.95GHz. This frequency band difference requires application-level assessment to determine suitability for your specific circuit design.

Insertion loss specification for HHM1903A1 is 1.0dB maximum, compared to 0.8dB for HHM1908A1. This 0.2dB difference is within typical RF component performance variation.

Both components comply with RoHS3 standards and carry identical ECCN and HTSUS classifications, supporting regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can HHM1903A1 be used as a direct replacement for HHM1908A1?

A: HHM1903A1 matches all mechanical and core electrical parameters (impedance, phase difference, package, mounting type, MSL). However, it operates in a different frequency band (2.4GHz–2.5GHz vs. 4.9GHz–5.95GHz). Direct substitution is only valid if your application operates within the 2.4GHz–2.5GHz band.

Q: What are the key parameters that determine substitution compatibility?

A: Substitution compatibility is determined by: manufacturer (TDK Corporation), impedance (50/100Ohm), phase difference (180° ±10°), package type (0402 with 4 PC Pad), mounting method (Surface Mount), and moisture sensitivity level (MSL 1). Frequency band and insertion loss are secondary considerations dependent on application requirements.

Q: Are there packaging differences between HHM1908A1 and HHM1903A1?

A: Both components use 0402 (1005 Metric) surface mount packages. HHM1908A1 specifies 4 PC Pad configuration, while HHM1903A1 is available in Cut Tape (CT) and Digi-Reel packaging formats. Physical footprint and pad layout remain compatible for PCB assembly.

Q: What is the inventory status for these obsolete parts?

A: HHM1908A1 has 874 Pcs in stock. HHM1903A1 has 10,200 Pcs in stock. Both are classified as obsolete products with no active manufacturing.

Q: How do insertion loss specifications compare?

A: HHM1908A1 specifies 0.8dB maximum insertion loss. HHM1903A1 specifies 1.0dB maximum insertion loss. The 0.2dB difference is typical for RF balun component variations and should be evaluated against your circuit's loss budget requirements.