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Analog Devices Inc. HMC641-SX
- Part No.:
- HMC641-SX
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Switches
- Package:
- Die
- Datasheet:
-
HMC641-SX.pdf
- Description:
- IC RF SWITCH SP4T 18GZ DIE 1=2PC
- Quantity:
- Payment:
- Shipping:
Inventory:4,307
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Product details
Overview
HMC641-SX from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SP4T non-reflective switch chip operating from DC to 18 GHz, delivering 2.1 dB insertion loss and 42 dB isolation at 12 GHz, with integrated 2:4 TTL decoder and -5 Vdc Vss bias for telecom infrastructure and microwave radio front-ends.
For engineers reviewing the HMC641-SX datasheet, HMC641-SX pinout, HMC641-SX application, or HMC641-SX equivalent, this page provides verified RF performance data, truth-table–driven control logic, thermal resistance specs (188 °C/W), die-level packaging details, and validated alternatives for broadband switching in VSAT and test instrumentation.
Technical Context
The HMC641-SX implements a monolithic GaAs PHEMT architecture with non-reflective termination on all four RF ports, enabling broadband impedance matching across DC–18 GHz. Its on-die binary decoder reduces external control lines from four to two (A/B), supporting TTL/CMOS logic with -5 Vdc Vee referenced to Vss.
It operates under fixed -5 Vdc Vss bias (±10%) and negative control voltages (-5 to -4.2 V for HIGH, -3 to 0 V for LOW), with RF paths DC-coupled and 50 Ω matched. Thermal design accounts for 188 °C/W channel-to-die-bottom resistance in the insertion loss path.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | DC to 18 GHz - supports full-bandwidth operation without band-switching in microwave radios and VSAT transceivers. |
| Insertion Loss | 2.1 dB @ 12 GHz - ensures minimal signal attenuation in high-frequency RF routing paths. |
| Isolation | 42 dB @ 12 GHz - prevents crosstalk between selected and unselected RF ports in multi-path systems. |
| Input IP3 | 40 dBm @ 0.05–18 GHz - enables linear operation with two +14 dBm tones in high-dynamic-range test equipment. |
| Switching Speed | tON/tOFF = 95 ns - meets timing requirements for fast-hop frequency synthesizers and agile signal routing. |
| Vss Supply | -5 Vdc ±10% - requires stable negative bias rail; die bottom must be grounded for RF/DC return path integrity. |
| Operating Temp | -55 °C to +85 °C - qualified for military, space hybrid, and industrial outdoor base station environments. |
Pinout & Package
Package: Bare die in WP-18 waffle pack; dimensions 1.92 × 1.60 × 0.10 mm; gold bond pads (0.004″ square); die bottom metallized and grounded.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RFC | Common RF Port | DC-coupled 50 Ω input; requires external blocking capacitor if DC potential ≠ 0 V. |
| RF1–RF4 | Four Switched RF Outputs | DC-coupled, non-reflective 50 Ω outputs; each independently selectable via A/B logic. |
| CTLA, CTLB | Binary Control Inputs | TTL/CMOS-compatible; driven with -5 V referenced logic; define RFC→RF1–RF4 path per truth table. |
| Vss | Negative Supply Rail | -5 Vdc ±10% bias supply; powers internal PHEMTs and decoder; must be decoupled locally. |
| Die Bottom | RF/DC Ground Reference | Gold-metallized surface; mandatory connection to system ground plane for thermal and RF return path. |
Key Features
| Feature | Design Value |
|---|---|
| Non-reflective SP4T Architecture | Terminated off-state ports minimize VSWR degradation and prevent signal reflections in cascaded RF chains. |
| Integrated 2:4 TTL Decoder | Reduces external logic count by 50%; eliminates need for discrete decoder ICs in compact microwave modules. |
| Broadband DC–18 GHz Operation | Enables single-switch coverage across L-, S-, C-, X-, Ku-bands without re-tuning or band selection circuitry. |
| Low Thermal Resistance Path | 188 °C/W (insertion path) allows sustained +24 dBm input power handling with minimal junction temperature rise. |
| Gold Bond Pad Metallization | Ensures reliable wire bonding with 3.0 × 0.5 mil gold ribbons; supports repeatable RF fixture calibration. |
Applications
| Telecom Infrastructure | Microwave Radio & VSAT |
|---|---|
Use Scenario: RF path selection in macrocell and small-cell BTS transceivers requiring frequency agility across 700 MHz–3.8 GHz bands. IC Role / Device Role / Timing Role: SP4T switch routing antenna diversity signals or TDD/FDD duplex paths with sub-100 ns settling. Use Value: 42 dB isolation prevents TX leakage into RX chains; non-reflective design maintains PA stability under mismatched loads. | Use Scenario: Transmit/receive and polarization switching in Ku-band VSAT outdoor units and point-to-point microwave radios. IC Role / Device Role / Timing Role: High-isolation RF switch selecting between horizontal/vertical polarizations or uplink/downlink paths up to 18 GHz. Use Value: DC–18 GHz bandwidth covers entire Ku-band (12–18 GHz); 2.1 dB loss preserves link budget in low-PAPR satellite modems. |
| Military & Space Hybrids | Test Instrumentation |
Use Scenario: Signal routing in phased-array radar T/R modules and radiation-hardened communication payloads. IC Role / Device Role / Timing Role: Non-reflective SP4T switch enabling rapid beam steering path selection with minimal phase perturbation. Use Value: -55 °C to +85 °C operation and 150 °C max channel temperature support extended mission profiles in harsh environments. | Use Scenario: Automated RF path configuration in vector network analyzers, spectrum analyzers, and signal generators. IC Role / Device Role / Timing Role: Precision broadband switch in calibration reference paths and stimulus routing networks. Use Value: 40 dBm IP3 and <2.1 dB loss ensure measurement accuracy and dynamic range preservation across full instrument bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SP4T RF switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| HMC7992-SX | Wider bandwidth (DC–20 GHz), lower IL (1.7 dB @ 12 GHz), but requires +3.3 V positive control and separate Vdd/Vss rails. | Supports higher-frequency 5G FR2 and E-band test systems; incompatible with legacy -5 V TTL control infrastructure. | Select when upgrading to 20 GHz systems and redesigning bias/control logic; not drop-in compatible. |
| Qorvo QM11036 | DC–14 GHz, 2.4 dB IL @ 12 GHz, +5 V control, 1.6 × 1.2 mm package - smaller footprint but narrower bandwidth. | Suitable for cost-sensitive 5G small cells below 14 GHz; lacks non-reflective architecture and high-temp rating. | Choose for space-constrained 5G NR deployments where 18 GHz coverage is unnecessary. |
Compared with HMC641-SX, HMC7992-SX offers extended bandwidth and improved linearity but demands full control voltage redesign, while QM11036 trades bandwidth and thermal robustness for size and cost-making HMC641-SX optimal for legacy -5 V systems needing full 18 GHz coverage and non-reflective performance.
Availability
HMC641-SX is available at Aetrix Electronics and suitable for telecom infrastructure, microwave radio & VSAT, and military & space hybrid applications requiring stable component supply and long-lifecycle support for legacy RF designs.
Supply support for HMC641-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 acquired Hittite Microwave in 2014 and maintains its high-frequency RF portfolio, specializing in GaAs, GaN, and SiGe MMICs for defense, aerospace, and communications.
The HMC641-SX belongs to Hittite's legacy SP4T switch product line, engineered for broadband non-reflective signal routing in microwave front-ends where wideband isolation and low loss are critical.
FAQ
What is the control voltage interface requirement for the HMC641-SX?
The HMC641-SX uses negative TTL/CMOS control logic: CTLA and CTLB accept -5 to -4.2 V for HIGH and -3 to 0 V for LOW, referenced to the -5 Vdc Vss rail. External HCT logic gates must have their Vee pin tied to -5 V to match the switch's bias domain. This ensures correct decoding per the truth table without level-shifting circuitry.
Does the HMC641-SX require external DC blocking capacitors?
Yes, the HMC641-SX RF ports (RFC, RF1–RF4) are DC-coupled and matched to 50 Ω, so external DC blocking capacitors are required on all ports if the connected RF line has non-zero DC potential. This prevents bias disruption and ensures proper 50 Ω impedance continuity across the signal path.
What is the thermal resistance specification for the HMC641-SX and how does it impact power handling?
The HMC641-SX has a channel-to-die-bottom thermal resistance of 188 °C/W for the insertion loss path. At +24 dBm (251 mW) input power, this yields ~47 °C junction rise above die bottom temperature-enabling reliable operation within the -55 °C to +85 °C case range when properly mounted to a thermally conductive ground plane.
Can the HMC641-SX be used in reflective (series-shunt) configurations?
No-the HMC641-SX is specifically designed as a non-reflective SP4T switch with terminated off-state ports. Using it in a reflective configuration would violate its internal termination architecture, degrade isolation, increase VSWR, and risk instability in amplifier stages. It must be used per the non-reflective application circuits shown in the datasheet.
What packaging options are available for the HMC641-SX?
The HMC641-SX is supplied as a bare die in WP-18 waffle pack format only. It has no molded package or leadframe; users must integrate it via die attach and wire bonding onto custom substrates or hybrid circuits. Alternate packaging is not offered-designers must plan for 1.92 × 1.60 mm die placement and gold ribbon bonding (3.0 × 0.5 mil typical).
HMC641-SX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- Die
- Packaging:
- Bulk
- Product Status:
- Obsolete
- RF Type:
- VSAT
- Topology:
- Absorptive
- Circuit:
- SP4T
- Frequency Range:
- -
- Isolation:
- -
- Insertion Loss:
- -
- Test Frequency:
- -
- P1dB:
- -
- IIP3:
- 40dBm (typ)
- Features:
- -
- Impedance:
- 50Ohm
- Voltage - Supply:
- -
- Operating Temperature:
- -55°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- Die
HMC641-SX FAQ
1.How can I place an order for HMC641-SX through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC641-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 HMC641-SX reliable?
The price and inventory of HMC641-SX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC641-SX is usually 5 days.
3.What payment methods are accepted for HMC641-SX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC641-SX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC641-SX?
HMC641-SX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC641-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 HMC641-SX?
For technical support, including HMC641-SX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC641-SX requirements.
6.How does Aetrix verify that HMC641-SX is sourced from the original manufacturer or authorized distributors?
All HMC641-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 HMC641-SX meets industry standards.
7.What is the process for return or replacement of HMC641-SX?
All HMC641-SX units undergo pre-shipment inspection (PSI). If there is an issue with HMC641-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 HMC641-SX part is unused and in its original packaging.
Return procedure for HMC641-SX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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