HHM1904C1

Product Overview

For RF paths operating across 2.4 GHz to 2.5 GHz, HHM1904C1 establishes the published impedance and balance relationship. The 1:1.5 relationship converts the 50 Ω unbalanced / 75 Ω balanced ports and establishes the differential load expected by the connected RF stage. Confirmed selection data includes insertion-loss performance of 1.0 dB maximum, return loss of 10 dB minimum, amplitude balance of 0 dB ±2 dB, phase balance of 180° ±10°.

The device is intended for 2.4 GHz WLAN and Bluetooth RFICs with a 75 Ω differential port. Its compact footprint lets the balun sit close to the RFIC, reducing the additional phase error and mismatch introduced by long differential PCB traces. The recorded lifecycle state is Obsolete, so the part is principally relevant to legacy production, repair and shortage sourcing.

Key Features

• Manufacturer: TDK
• Part Number: HHM1904C1
• Product Category: RF Balun / RF Transformer
• Device Type: multilayer or wound surface-mount RF balun transformer
• Frequency Range: 2.4 GHz to 2.5 GHz
• System / Port Impedance: 50 Ω unbalanced / 75 Ω balanced
• Impedance / Matching Relationship: 1:1.5
• Insertion Loss: 1.0 dB maximum
• Return Loss: 10 dB minimum
• Amplitude Balance / Unbalance: 0 dB ±2 dB
• Phase Balance / Difference: 180° ±10°
• Package / Case: 1.0 × 0.5 × 0.4 mm, 4-terminal HHM19
• Mounting Type: Surface mount
• Operating Temperature: -40°C to +85°C
• Lifecycle Status: Obsolete
• Target Application: 2.4 GHz WLAN and Bluetooth RFICs with a 75 Ω differential port

Applications

• 2.4 GHz WLAN and Bluetooth RFICs with a 75 Ω differential port
• CATV, broadcast, tuner and coaxial-to-differential receiver interfaces
• Compact WLAN, Bluetooth, IoT and embedded wireless modules

Quality & Sourcing

Antrex Electronics can support sourcing of HHM1904C1 for production, repair and shortage requirements. Incoming verification can compare the exact manufacturer marking, ordering suffix, package dimensions, frequency range, single-ended and balanced impedances, insertion-loss limits and lifecycle status. For obsolete or NRND devices, Antrex Electronics can also coordinate BOM sourcing and third-party inspection before shipment, while alternative parts should remain subject to engineering approval for PCB footprint, impedance and RF performance.