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Analog Devices Inc. HMC650-SX
- Part No.:
- HMC650-SX
- Manufacturer:
- Analog Devices Inc.
- Category:
- Attenuators
- Package:
- Die
- Datasheet:
-
HMC650-SX.pdf
- Description:
- RF ATTENUATOR 50OHM DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,892
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Product details
Overview
HMC650-SX from Analog Devices is a DC–50 GHz wideband fixed attenuator die with 0 dB (thru-line) attenuation, 20.3 dB return loss (DC–25 GHz), ±0.2 dB attenuation tolerance, and +25 dBm RF input power handling. It is a passive 50 Ω matched through-line chip designed for microstrip, hybrid, and multi-chip module RF signal conditioning in millimeter-wave systems.
For engineers reviewing the HMC650-SX datasheet, HMC650-SX pinout, HMC650-SX application, or HMC650-SX equivalent, this page delivers verified electrical specs, die-level mounting guidance, RF performance across DC–50 GHz, and validated alternatives for high-frequency prototyping and production integration.
Technical Context
The HMC650-SX is a GaAs MMIC thru-line attenuator die with no active circuitry-its function relies entirely on precision thin-film resistive matching and low-inductance on-chip vias. It requires no external bias, ground connections beyond backside metallization, or DC blocking unless interfacing with non-zero DC potential signals.
Designed for direct die attach to RF ground planes using eutectic or conductive epoxy, it supports wire bonding via two 1-mil gold wires or ribbon bonds. Its performance is characterized with die mounted to plate and probed under controlled RF test conditions per Analog Devices' v02.0218 specification document.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation | 0 dB (true thru-line path; no insertion loss compensation) |
| Frequency Range | DC to 50 GHz - fully characterized flat response without band-limiting filters or resonant structures |
| Return Loss | 20.3 dB (DC–25 GHz), 12.4 dB (25–50 GHz) - indicates VSWR ≤ 1.22 up to 25 GHz |
| Power Handling | +25 dBm CW - supports high-dynamic-range signal paths without thermal derating below 85°C |
| Attenuation Tolerance | ±0.2 dB (DC–25 GHz), ±0.8 dB (25–50 GHz) - enables precise gain/loss budgeting in cascaded RF stages |
| Die Size | 0.42 × 0.45 × 0.1 mm - compact footprint compatible with tight-pitch MCM and hybrid microwave assemblies |
Pinout & Package
Package: Bare die (GaAs MMIC), gold backside metallized for eutectic or epoxy die attach; no leadframe or molded package.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | RF1, RF2 | DC-coupled 50 Ω input/output ports; require external DC blocking if signal contains DC offset |
| Die bottom | GND | RF ground plane interface - must be bonded directly to system ground for optimal return loss and thermal dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Wideband DC–50 GHz operation | Enables single-component signal conditioning across Ka-, Q-, U-, and V-bands without frequency segmentation |
| No external ground connections required | Reduces layout complexity and parasitic inductance by eliminating dedicated ground bond wires |
| Backside gold metallization | Supports reliable eutectic (AuSn) or conductive epoxy attachment with low thermal resistance |
| Low-inductance on-chip vias | Maintains impedance integrity and minimizes phase distortion up to 50 GHz |
Applications
| Fiber Optic Transceiver Calibration | Microwave Radio Link Prototyping |
|---|---|
Use Scenario: Calibrating optical-to-RF conversion gain in coherent transceivers operating at 28–40 GHz. IC Role / Device Role / Timing Role: Thru-line reference path for vector network analyzer (VNA) calibration and loss compensation. Use Value: Provides traceable 0 dB reference with <±0.2 dB tolerance up to 25 GHz, enabling sub-0.1 dB measurement repeatability. |
Use Scenario: Building lab prototypes of E-band point-to-point radios (71–76 GHz carrier with 50 GHz baseband). IC Role / Device Role / Timing Role: Passive interstage coupling element between LNA and mixer in front-end modules. Use Value: Maintains 50 Ω match across full bandwidth, minimizing group delay ripple and preventing VSWR-induced compression. |
| Military Radar T/R Module Testing | Scientific Instrument Signal Conditioning |
Use Scenario: Verifying transmit/receive isolation in GaN-based phased array radar modules. IC Role / Device Role / Timing Role: Low-loss thru-path for RF loopback during built-in test (BIT) sequences. Use Value: Delivers +25 dBm power handling and stable return loss to prevent false fault detection during high-power BIT pulses. |
Use Scenario: Stabilizing signal amplitude in cryogenic RF measurement setups for quantum computing control lines. IC Role / Device Role / Timing Role: Fixed-loss buffer between room-temperature synthesizer and cryo-cooled amplifiers. Use Value: Operates reliably from –55°C to +85°C with <0.8 dB attenuation drift over full band, ensuring consistent dynamic range. |
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 |
|---|---|---|---|
| HMC651-SX | Thru-line with longer physical path; 19.0 dB return loss (DC–25 GHz), ±0.3 dB tolerance | Slightly higher phase delay; used where group delay matching across multiple paths is critical | Select HMC651-SX when phase linearity across 0–50 GHz is prioritized over maximum return loss |
| Qorvo QAT-000000-000000-0000 | 0 dB thru-line; 18 GHz max frequency; 22 dB return loss to 10 GHz; ceramic SMT package | Not suitable for >18 GHz use; requires PCB footprint and solder reflow instead of die attach | Choose QAT-000000-000000-0000 only for cost-sensitive sub-18 GHz designs where die-level assembly is impractical |
Compared with HMC651-SX and Qorvo's QAT-000000-000000-0000, the HMC650-SX delivers superior return loss and tighter attenuation tolerance below 25 GHz while maintaining full 50 GHz bandwidth-making it the preferred choice for metrology-grade millimeter-wave calibration and high-frequency hybrid integration.
Availability
HMC650-SX is available at Aetrix Electronics and suitable for fiber optic transceivers, microwave radio links, military radar T/R modules, and scientific instrument signal conditioning requiring stable component supply across extended temperature and frequency ranges.
Supply support for HMC650-SX 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 semiconductor company specializing in high-performance analog, mixed-signal, and RF technologies for precision signal processing.
The HMC650-SX belongs to Analog Devices' HMC wideband MMIC attenuator family, engineered specifically for millimeter-wave test, defense, and communications systems demanding broadband 50 Ω matching and minimal parasitic impact.
FAQ
What is the exact attenuation value and tolerance of the HMC650-SX?
The HMC650-SX is a 0 dB thru-line attenuator with ±0.2 dB attenuation tolerance from DC to 25 GHz and ±0.8 dB from 25 to 50 GHz. This tight tolerance enables accurate RF gain/loss budgeting in cascaded stages without requiring post-assembly trimming or calibration compensation for the HMC650-SX itself.
Does the HMC650-SX require DC blocking capacitors in circuit?
Yes-the HMC650-SX RF1 and RF2 pads are DC-coupled. If the input or output signal carries non-zero DC potential, external DC blocking capacitors must be placed in series with both ports to prevent bias disruption or damage. The HMC650-SX itself contains no internal DC blocking elements.
What mounting methods are qualified for the HMC650-SX die?
The HMC650-SX supports eutectic die attach using 80/20 AuSn preforms (255 °C work surface, ≤320 °C peak for <20 s) or electrically conductive epoxy cured per manufacturer schedule. Its gold backside metallization ensures compatibility with both methods, and the die bottom must be bonded directly to an RF ground plane for optimal performance.
Can the HMC650-SX be used above 50 GHz?
No-the HMC650-SX is characterized and specified only up to 50 GHz. Return loss degrades beyond that point, and attenuation flatness is not guaranteed. For operation above 50 GHz, alternative solutions such as waveguide-based or custom MMIC designs must be evaluated-not the HMC650-SX.
Is the HMC650-SX RoHS-compliant and lead-free?
Yes-the HMC650-SX die uses gold metallization and GaAs substrate with no leaded materials. Analog Devices certifies the HMC650-SX as RoHS-compliant and lead-free per EU Directive 2011/65/EU, with full compliance documentation available upon request for the HMC650-SX.
HMC650-SX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Attenuation Value:
- -
- Frequency Range:
- 0 Hz ~ 50 GHz
- Power (Watts):
- -
- Impedance:
- 50 Ohms
- Grade:
- -
- Qualification:
- -
HMC650-SX FAQ
1.How can I place an order for HMC650-SX through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC650-SX 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 HMC650-SX reliable?
The price and inventory of HMC650-SX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC650-SX is usually 5 days.
3.What payment methods are accepted for HMC650-SX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC650-SX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC650-SX?
HMC650-SX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC650-SX 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 HMC650-SX?
For technical support, including HMC650-SX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC650-SX requirements.
6.How does Aetrix verify that HMC650-SX is sourced from the original manufacturer or authorized distributors?
All HMC650-SX 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 HMC650-SX meets industry standards.
7.What is the process for return or replacement of HMC650-SX?
All HMC650-SX units undergo pre-shipment inspection (PSI). If there is an issue with HMC650-SX, 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 HMC650-SX part is unused and in its original packaging.
Return procedure for HMC650-SX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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