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Analog Devices Inc. HMC651
- Part No.:
- HMC651
- Manufacturer:
- Analog Devices Inc.
- Category:
- Attenuators
- Package:
- Die
- Datasheet:
-
HMC651.pdf
- Description:
- RF ATTENUATOR 50OHM DIE
- Quantity:
- Payment:
- Shipping:
Inventory:1,258
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Product details
Overview
HMC651 from Analog Devices is a passive wideband fixed attenuator die with 0 dB nominal attenuation (long thru-line configuration), DC–50 GHz bandwidth, 19.0 dB return loss (DC–25 GHz), ±0.3 dB attenuation tolerance, and +25 dBm RF input power handling. It serves as a precision impedance-matched signal path in microwave hybrid assemblies and millimeter-wave test fixtures.
For engineers reviewing the HMC651 datasheet, HMC651 pinout, HMC651 application, or HMC651 equivalent, this page delivers verified die-level specifications, RF performance across full bandwidth, mounting guidance for microstrip integration, and validated alternatives for high-frequency prototyping and production.
Technical Context
The HMC651 is a GaAs MMIC passive thru-line attenuator die-no active circuitry or bias required-designed for direct integration into 50 Ω microstrip, hybrid, or multi-chip module substrates. Its backside metallization is gold-plated ground, eliminating need for external ground vias.
It features low-inductance on-chip vias and operates over –55°C to +85°C with no DC blocking requirement unless input/output signals contain non-zero DC potential. Performance is characterized using wire-bonded RF probing per MIL-STD-883 test method.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation Value | 0 dB (long thru-line configuration; preserves signal amplitude with minimal insertion loss) |
| Bandwidth | DC to 50 GHz (supports full millimeter-wave operation up to WR-22 band) |
| Return Loss | 19.0 dB (DC–25 GHz) / 12.3 dB (25–50 GHz); ensures <1.34 VSWR across baseband and mmWave |
| Attenuation Tolerance | ±0.3 dB (DC–25 GHz); enables precise gain calibration in test instrumentation chains |
| RF Input Power | +25 dBm CW (no derating required at room temperature; supports high-power signal routing) |
| Die Size | 0.57 × 0.45 × 0.1 mm; compatible with standard die attach processes on alumina thin-film substrates |
Pinout & Package
HMC651 is supplied as an unpackaged GaAs MMIC die with gold metallized bond pads and backside ground. It requires eutectic or conductive epoxy die attach to a grounded RF substrate.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pad 1 | RF1 | 50 Ω matched input port; DC-coupled; requires external DC blocking if biased signal present |
| Pad 2 | RF2 | 50 Ω matched output port; DC-coupled; same interface constraints as RF1 |
| Backside | GND | Monolithic gold ground plane; must be bonded directly to RF ground plane-no additional grounding needed |
Key Features
| Feature | Design Value |
|---|---|
| Wideband 50 Ω match | Enables seamless integration into microstrip layouts without matching networks up to 50 GHz |
| No external ground vias | Reduces layout complexity and parasitic inductance in high-frequency hybrid circuits |
| Eutectic/epoxy compatible | Supports industry-standard die attach methods including AuSn preforms and conductive epoxies |
| Backside metallized ground | Ensures repeatable RF grounding performance and thermal dissipation via substrate conduction |
Applications
| Fiber Optic Transceiver Calibration | Microwave Radio Front-End Prototyping |
|---|---|
Use Scenario: Calibrating optical-to-RF conversion gain in 40G/100G coherent transceivers using vector network analyzers. IC Role / Device Role / Timing Role: Passive thru-line reference path providing known 0 dB insertion loss and broadband impedance match. Use Value: Eliminates need for external calibration standards by delivering stable, flat response from DC to 50 GHz. | Use Scenario: Building compact, high-isolation transmit/receive front-end modules for E-band point-to-point radios. IC Role / Device Role / Timing Role: Signal path equalizer and isolation enhancer between PA and LNA stages. Use Value: Maintains 50 Ω continuity while minimizing VSWR-induced ripple across 71–76 GHz and 81–86 GHz bands. |
| Test & Measurement Fixture Design | Space-Qualified Hybrid Assembly |
Use Scenario: Constructing wafer-probe-compatible RF interconnects for millimeter-wave IC validation. IC Role / Device Role / Timing Role: Low-parasitic thru-line element enabling accurate S-parameter de-embedding of probe tips. Use Value: Delivers <0.3 dB attenuation deviation across full bandwidth-critical for traceable metrology-grade measurements. | Use Scenario: Integrating into radiation-hardened hybrid modules for satellite telemetry downlink subsystems. IC Role / Device Role / Timing Role: Impedance-stabilizing element in hermetically sealed multi-layer ceramic packages. Use Value: Operates reliably from –55°C to +85°C with no performance drift; gold metallization ensures long-term bond integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-thru-line attenuator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC650 | Same 0 dB thru-line function but smaller die size (0.42 × 0.45 mm); 20.3 dB return loss (DC–25 GHz) | Preferred where board space is constrained and higher return loss is required below 25 GHz | Select HMC650 when footprint minimization outweighs need for longer thru-line phase delay stability |
| Qorvo QPA2211 | 0 dB GaAs MMIC thru-line die; 0.5 × 0.5 mm; 18 dB return loss (DC–40 GHz); +27 dBm power handling | Better suited for higher-power E-band systems requiring >+25 dBm margin | Choose QPA2211 only when operating above +25 dBm CW or requiring tighter mechanical tolerance control |
Compared with HMC650 and QPA2211, the HMC651 provides longer physical thru-line geometry for improved phase consistency in calibrated paths, trades 1.3 dB lower return loss vs. HMC650 below 25 GHz, and offers lower power rating than QPA2211-making it optimal for precision metrology and hybrid assembly where phase fidelity and manufacturability dominate.
Availability
HMC651 is available at Aetrix Electronics and suitable for fiber optic transceiver calibration, microwave radio front-end prototyping, and test & measurement fixture design requiring stable component supply across aerospace, defense, and communications OEM programs.
Supply support for HMC651 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 semiconductor solutions, headquartered in Norwood, MA.
The HMC651 belongs to the HMC650–HMC658 wideband fixed attenuator family, engineered specifically for millimeter-wave hybrid and multi-chip module integration where broadband 50 Ω matching and minimal parasitic deviation are critical.
FAQ
What is the exact attenuation value and tolerance of the HMC651?
The HMC651 is a 0 dB fixed thru-line attenuator with ±0.3 dB attenuation tolerance from DC to 25 GHz and ±0.9 dB from 25 to 50 GHz. This tight tolerance enables use as a precision reference path in calibration-grade RF test setups and ensures predictable signal level preservation across its full bandwidth.
Does the HMC651 require DC blocking capacitors in circuit?
The HMC651 has DC-coupled RF1 and RF2 ports matched to 50 Ω, so DC blocking capacitors are required only if the input or output signals carry non-zero DC potential. When used in AC-coupled systems-such as between amplifier stages with defined DC bias points-external blocking is mandatory to prevent damage or mismatch.
What is the recommended die attach method for the HMC651?
Analog Devices specifies eutectic die attach using 80/20 AuSn preforms at 255 °C work surface temperature, or electrically conductive epoxy cured per manufacturer schedule. The HMC651's gold backside metallization ensures reliable thermal and RF grounding when bonded directly to a grounded substrate-no additional ground vias needed.
Can the HMC651 be used above 50 GHz?
No-the HMC651 is characterized and specified only up to 50 GHz. Beyond that frequency, return loss degrades significantly (e.g., <12 dB above 45 GHz), and attenuation flatness is no longer guaranteed. For operation above 50 GHz, alternative MMIC solutions with extended bandwidth validation must be selected.
Is the HMC651 RoHS compliant and lead-free?
Yes-the HMC651 is RoHS compliant and lead-free per Analog Devices' product compliance documentation. Its gold metallization (bond pads and backside) and GaAs substrate meet JEDEC J-STD-609 Category 1 requirements, supporting both commercial and aerospace-grade assembly processes.
HMC651 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Attenuation Value:
- -
- Frequency Range:
- 0 Hz ~ 50 GHz
- Power (Watts):
- -
- Impedance:
- 50 Ohms
- Grade:
- -
- Qualification:
- -
HMC651 FAQ
1.How can I place an order for HMC651 through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC651 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 HMC651 reliable?
The price and inventory of HMC651 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC651 is usually 5 days.
3.What payment methods are accepted for HMC651?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC651 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC651?
HMC651 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC651 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 HMC651?
For technical support, including HMC651 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC651 requirements.
6.How does Aetrix verify that HMC651 is sourced from the original manufacturer or authorized distributors?
All HMC651 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 HMC651 meets industry standards.
7.What is the process for return or replacement of HMC651?
All HMC651 units undergo pre-shipment inspection (PSI). If there is an issue with HMC651, 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 HMC651 part is unused and in its original packaging.
Return procedure for HMC651:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC651 Tags
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