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Analog Devices Inc. HMC655
- Part No.:
- HMC655
- Manufacturer:
- Analog Devices Inc.
- Category:
- Attenuators
- Package:
- Die
- Datasheet:
-
HMC655.pdf
- Description:
- RF ATTENUATOR 6DB 50OHM DIE
- Quantity:
- Payment:
- Shipping:
Inventory:3,219
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Product details
Overview
HMC655 from Analog Devices is a 6 dB wideband fixed attenuator die designed for DC–50 GHz RF signal conditioning in microstrip, hybrid, and multi-chip module circuits. It features 50 Ω input/output impedance, ±0.2 dB attenuation tolerance (DC–25 GHz), 16.5 dB return loss (DC–25 GHz), and +26 dBm CW RF input power handling - enabling precision amplitude control in high-frequency test & measurement and microwave radio front-ends.
For engineers reviewing the HMC655 datasheet, HMC655 pinout, HMC655 application, or HMC655 equivalent, this page delivers verified die-level specifications, validated RF performance across 0–50 GHz, mounting guidance for millimeter-wave GaAs MMIC integration, and real-world alternatives for broadband attenuator selection in space-constrained RF layouts.
Technical Context
The HMC655 is a passive, monolithic GaAs MMIC attenuator die with two RF terminals (RF1, RF2) and backside ground metallization - requiring no external bias or control signals. Its design eliminates on-die inductance via low-inductance vias and supports direct eutectic or conductive epoxy die attach to RF ground planes.
Performance is characterized using 1-mil wire bonds or ribbon bonds; data applies to die mounted on grounded alumina substrates with 50 Ω microstrip lines. Return loss and attenuation flatness are maintained across –55°C to +85°C operating temperature, with minimal drift vs. frequency up to 50 GHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation Value | 6 dB nominal, ±0.2 dB tolerance from DC to 25 GHz - ensures predictable signal reduction without active tuning or calibration. |
| Frequency Range | DC to 50 GHz - supports full-bandwidth operation in Ka-band, V-band, and millimeter-wave systems without roll-off compensation. |
| Return Loss | 16.5 dB (DC–25 GHz), 17.0 dB (25–50 GHz) - minimizes reflections in high-speed RF interconnects and preserves signal integrity. |
| RF Input Power | +26 dBm CW - enables use in medium-power transmitter stages and receiver protection paths without thermal derating. |
| Die Size | 0.42 × 0.45 × 0.1 mm - fits compact MCM and hybrid PCB footprints where surface-mount chip resistors lack bandwidth. |
| Impedance | 50 Ω matched input/output - integrates directly into standard RF microstrip traces without matching networks. |
| Operating Temp | –55°C to +85°C - qualified for military, aerospace, and industrial environments with no performance degradation. |
Pinout & Package
HMC655 is supplied as a bare GaAs die in GP-5 gel pack packaging. The device has no leads or molded package; it is mounted directly onto RF-grounded substrates using eutectic or conductive epoxy attachment. Backside metallization is gold-plated and serves as the RF ground reference.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RF1) | Input RF port | DC-coupled 50 Ω terminal; requires external DC blocking capacitor if input has non-zero DC bias. |
| 2 (RF2) | Output RF port | DC-coupled 50 Ω terminal; maintains matched impedance to preserve VSWR across full bandwidth. |
| GND | Backside metallization | Must be bonded to RF ground plane; no separate ground pin - critical for return path integrity at mmWave frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Wideband flat attenuation | ±0.2 dB tolerance up to 25 GHz ensures consistent gain control in broadband receivers and vector network analyzer calibration paths. |
| No external ground connections needed | Backside gold metallization provides low-inductance RF ground return - eliminates via-count overhead in thin-film hybrid designs. |
| Millimeter-wave compatible | Validated performance to 50 GHz supports 5G FR2, satellite comms, and radar test equipment without band-limiting parasitics. |
| Eutectic or epoxy attach | Compatible with AuSn preforms (255°C work surface) or conductive epoxies - enables integration into both high-reliability and cost-sensitive assemblies. |
| ESD-protected handling | Shipped in ESD-safe gel packs with nitrogen storage guidance - mitigates gate oxide damage during manual die placement. |
Applications
| Fiber Optic Transceiver Calibration | Microwave Radio Front-End |
|---|---|
Use Scenario: Attenuating local oscillator leakage or pilot tones before optical modulation to prevent nonlinear distortion in coherent transceivers. IC Role / Device Role / Timing Role: Passive signal level conditioner placed between LO source and modulator driver. Use Value: 6 dB attenuation with <17 dB return loss up to 50 GHz suppresses spurious emissions while preserving phase noise integrity. |
Use Scenario: Setting precise RF power levels in point-to-point microwave radios operating at 24–38 GHz. IC Role / Device Role / Timing Role: Fixed-loss element in transmit chain output stage for gain staging and spectral mask compliance. Use Value: ±0.2 dB tolerance ensures repeatable EVM across production units without per-unit trimming. |
| Test & Measurement Signal Path | Space-Qualified Hybrid Module |
Use Scenario: Calibrating vector network analyzers and spectrum analyzers by inserting known loss in reference paths. IC Role / Device Role / Timing Role: Traceable broadband attenuator standard used in metrology-grade lab setups. Use Value: DC–50 GHz coverage enables single-component calibration from baseband through W-band, reducing fixture complexity. |
Use Scenario: Level-setting in radiation-hardened satellite telemetry downconverters operating in L/S/C bands. IC Role / Device Role / Timing Role: Radiation-tolerant passive component embedded in hermetic multi-chip modules. Use Value: Gold backside metallization and –55°C to +85°C operation meet MIL-PRF-38534 Class K requirements for space hybrids. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed attenuator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC656 | 10 dB attenuation, same die size (0.42 × 0.45 mm), ±0.1 dB tolerance (DC–25 GHz), 16.9 dB return loss (DC–25 GHz) | Higher attenuation for receiver AGC paths or higher-loss test fixtures; tighter tolerance but lower return loss than HMC655 below 25 GHz | Select HMC656 when 10 dB loss is required with minimal footprint change; verify system VSWR impact at band edges. |
| QAT-6W+ | 6 dB attenuation, 0402 SMT package (1.0 × 0.5 mm), DC–40 GHz, ±0.5 dB tolerance, 14 dB return loss (DC–25 GHz) | Surface-mount alternative with larger footprint and lower RF performance; no die-attach process required | Choose QAT-6W+ for rapid prototyping or lower-frequency designs where 0.5 dB tolerance and 40 GHz limit are acceptable. |
Compared with HMC655, HMC656 offers higher attenuation and tighter tolerance but slightly reduced return loss at low frequencies, while QAT-6W+ trades mmWave bandwidth and precision for SMT assembly simplicity - making HMC655 optimal for 50 GHz systems demanding 6 dB loss with sub-0.3 dB variation.
Availability
HMC655 is available at Aetrix Electronics and suitable for fiber optic transceivers, microwave radio front-ends, and test & measurement signal paths requiring stable component supply across extended temperature ranges and millimeter-wave frequencies.
Supply support for HMC655 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, automotive, and defense markets with precision signal processing solutions.
The HMC655 belongs to the HMC650–HMC658 wideband fixed attenuator family, engineered specifically for DC–50 GHz passive signal conditioning in GaAs-based hybrid and multi-chip module RF subsystems.
FAQ
What is the exact attenuation value and tolerance of the HMC655 across its operating frequency range?
The HMC655 provides a nominal 6 dB attenuation with ±0.2 dB tolerance from DC to 25 GHz and ±0.6 dB tolerance from 25 GHz to 50 GHz. These values are measured under standard conditions using 1-mil wire bonds on grounded alumina substrates, and they reflect the device's guaranteed flatness for precision RF amplitude control in broadband systems.
Does the HMC655 require external DC blocking capacitors in circuit?
Yes, the HMC655 RF1 and RF2 terminals are DC-coupled and matched to 50 Ω, so external DC blocking capacitors must be used if either the input or output signal carries non-zero DC potential. This prevents unintended bias shifts and ensures proper 50 Ω termination across the full DC–50 GHz range of the HMC655.
What is the recommended mounting method for the HMC655 die?
The HMC655 die should be attached directly to an RF ground plane using either AuSn eutectic preforms (255°C work surface temperature) or electrically conductive epoxy. Its gold backside metallization serves as the RF ground reference, and mechanical stability is critical - avoid touching the top surface due to fragile air bridges during handling or bonding.
Can the HMC655 be used in space or high-reliability hybrid modules?
Yes, the HMC655 is qualified for operation from –55°C to +85°C and features gold backside metallization compatible with eutectic die attach - meeting key requirements for space-qualified hybrid modules. Its inclusion in the HMC-DK006 Designer's Kit further validates its suitability for military and aerospace RF subsystems.
How does the HMC655 compare to SMT attenuators like the QAT-6W+ in terms of RF performance?
The HMC655 delivers superior RF performance versus SMT alternatives: it operates to 50 GHz (vs. 40 GHz for QAT-6W+), achieves ±0.2 dB attenuation tolerance (vs. ±0.5 dB), and maintains >16.5 dB return loss up to 25 GHz (vs. 14 dB). These advantages make the HMC655 essential for millimeter-wave applications where bandwidth and precision cannot be compromised.
HMC655 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Attenuation Value:
- 6dB
- Frequency Range:
- 0 Hz ~ 50 GHz
- Power (Watts):
- -
- Impedance:
- 50 Ohms
- Grade:
- -
- Qualification:
- -
HMC655 FAQ
1.How can I place an order for HMC655 through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC655 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for HMC655 reliable?
The price and inventory of HMC655 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC655 is usually 5 days.
3.What payment methods are accepted for HMC655?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC655 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC655?
HMC655 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC655 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for HMC655?
For technical support, including HMC655 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC655 requirements.
6.How does Aetrix verify that HMC655 is sourced from the original manufacturer or authorized distributors?
All HMC655 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that HMC655 meets industry standards.
7.What is the process for return or replacement of HMC655?
All HMC655 units undergo pre-shipment inspection (PSI). If there is an issue with HMC655, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The HMC655 part is unused and in its original packaging.
Return procedure for HMC655:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC655 Tags
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PAT0510S-C-3DB-T10
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