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Analog Devices Inc. HMC656LP2
- Part No.:
- HMC656LP2
- Manufacturer:
- Analog Devices Inc.
- Category:
- Attenuators
- Package:
- 6-TDFN Exposed Pad
- Datasheet:
-
HMC656LP2.pdf
- Description:
- RF ATTENUATOR 10DB 50OHM 6TDFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,497
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Product details
Overview
HMC656LP2 from Analog Devices (formerly Hittite Microwave) is a 10 dB wideband fixed attenuator IC for RF/microwave signal conditioning in 50 Ω systems, operating from DC to 25 GHz with ±1.5 dB attenuation tolerance, 7 dB min return loss, and +25 dBm CW power handling - deployed in fiber-optic transceivers and microwave radio front-ends.
For engineers reviewing the HMC656LP2 datasheet, HMC656LP2 pinout, HMC656LP2 application, or HMC656LP2 equivalent, key selection criteria include broadband flatness (DC–25 GHz), RoHS-compliant 2×2 mm SMT package, thermal stability (0.0004 dB/°C), and compatibility with high-volume reflow (MSL1, 260 °C peak).
Technical Context
This passive 50 Ω matched attenuator uses low-stress injection-molded plastic packaging with matte tin lead finish and copper alloy leadframe. It features DC-coupled RF ports (pins 2 and 5), requiring external DC blocking capacitors when interfacing with non-zero DC bias signals.
All six terminals are electrically defined: pins 1, 3, 4, and 6 serve as ground connections tied to both RF and DC ground, while pins 2 and 5 form the input/output RF path. The exposed paddle must be soldered to PCB ground per RF design best practices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Attenuation | 10 dB ±1.5 dB over full DC–25 GHz band and operating temperature range |
| Frequency Range | DC to 25 GHz - supports wideband modulation schemes without frequency-dependent gain error |
| Return Loss | ≥7 dB minimum (typ. 12 dB) - ensures minimal signal reflection across entire bandwidth |
| Power Handling | +25 dBm CW - enables use in medium-power RF stages without thermal derating |
| Temp. Coefficient | 0.0004 dB/°C - guarantees <±0.032 dB drift over −40°C to +85°C operating range |
| Package Size | 2 mm × 2 mm × 0.85 mm - compact footprint compatible with dense RF layout and automated SMT assembly |
Pinout & Package
Package: RoHS-compliant 6-lead 2×2 mm SMT package (MSL1, 260 °C peak reflow), low-stress injection-molded plastic body with 100% matte Sn lead finish and copper alloy leadframe. Exposed ground paddle must be soldered to PCB RF ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 3, 4, 6 | GND | RF/DC ground terminals - all must be connected to solid PCB ground plane to maintain impedance match and shielding |
| 2 | RF1 | DC-coupled 50 Ω input port - requires external DC blocking capacitor if source has non-zero DC offset |
| 5 | RF2 | DC-coupled 50 Ω output port - requires external DC blocking capacitor if load has non-zero DC offset |
Key Features
| Feature | Design Value |
|---|---|
| Wideband flatness | ≤±0.5 dB variation across DC–25 GHz - preserves signal integrity in ultra-wideband modulated systems |
| High power rating | +25 dBm continuous wave - supports operation upstream of PA drivers and in test equipment signal chains |
| Thermal stability | 0.0004 dB/°C coefficient - eliminates need for recalibration in temperature-varying environments |
| RoHS-compliant packaging | Matte Sn finish, MSL1 rating, 260 °C peak reflow - ensures compatibility with modern lead-free manufacturing lines |
Applications
| Fiber-Optic Transceiver Calibration | Microwave Radio Front-End |
|---|---|
Use Scenario: Attenuating laser driver output or receiver input to prevent saturation during optical link margin testing. IC Role / Device Role / Timing Role: Passive 50 Ω matched signal level setter between high-speed DAC/ADC and optical modulator/detector. Use Value: Maintains flat frequency response up to 25 GHz to avoid distortion of multi-Gbaud PAM4 or NRZ signals. | Use Scenario: Setting precise gain control points in E-band (60–90 GHz) transceiver IF/RF paths before up/down-conversion. IC Role / Device Role / Timing Role: Fixed-loss element used in cascaded filter/amp chains to stabilize group delay and impedance matching. Use Value: Enables repeatable VSWR <1.5:1 across DC–25 GHz, critical for minimizing phase noise degradation in LO distribution. |
| Test & Measurement Signal Conditioning | Scientific Instrument RF Staging |
Use Scenario: Calibrating vector network analyzer (VNA) port extensions and reference plane offsets in lab-grade RF characterization. IC Role / Device Role / Timing Role: Known-loss standard inserted between VNA ports and DUT to de-embed fixture effects. Use Value: ±1.5 dB attenuation tolerance and 7 dB min return loss ensure traceable measurement uncertainty under 0.1 dB. | Use Scenario: Isolating sensitive cryogenic amplifier stages from room-temperature signal sources in quantum computing readout chains. IC Role / Device Role / Timing Role: Thermally stable 10 dB pad placed at 4K-to-300K interface to reduce thermal noise coupling and improve dynamic range. Use Value: 0.0004 dB/°C tempco allows operation across wide thermal gradients without recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-attenuator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Qorvo QPA1006 | 10 dB, DC–20 GHz, ±1.0 dB tolerance, +33 dBm power handling, 3×3 mm QFN | Better power handling but narrower bandwidth; larger footprint limits high-density layouts | Prefer QPA1006 only when >+25 dBm input power is required and bandwidth ≤20 GHz suffices |
| Mini-Circuits VAT-10W2+ | 10 dB, DC–18 GHz, ±0.5 dB tolerance, +27 dBm, 2.5×2.5 mm ceramic SMT | Tighter tolerance and higher power, but 7 GHz lower upper-frequency limit | Select VAT-10W2+ where ultra-flatness (<±0.5 dB) is prioritized over 20–25 GHz coverage |
Compared with QPA1006 and VAT-10W2+, the HMC656LP2 delivers unique combination of 25 GHz bandwidth, 2×2 mm size, and verified thermal stability - making it optimal for next-generation millimeter-wave instrumentation and space-constrained optical modules where full-band flatness is non-negotiable.
Availability
HMC656LP2 is available at Aetrix Electronics and suitable for fiber-optic transceivers, microwave radio front-ends, and test & measurement equipment requiring stable component supply across extended temperature ranges and high-frequency performance.
Supply support for HMC656LP2 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 integrates its high-frequency RF portfolio into precision analog and RF solutions for communications, defense, and instrumentation markets.
The HMC656LP2 belongs to the Wideband Fixed Attenuator family designed specifically for DC–25 GHz signal conditioning in mission-critical RF systems where flatness, repeatability, and thermal stability outweigh cost-sensitive consumer trade-offs.
FAQ
What is the maximum continuous RF input power rating for the HMC656LP2?
The HMC656LP2 supports +25 dBm continuous wave (CW) RF input power at 25 °C ambient. Derating is not specified in the datasheet, and operation above this level risks permanent damage due to thermal overload. This rating applies across the full DC–25 GHz bandwidth and is validated under proper PCB grounding per the recommended land pattern.
Does the HMC656LP2 require DC blocking capacitors on its RF ports?
Yes - the HMC656LP2 RF ports (pins 2 and 5) are DC-coupled and internally matched to 50 Ω. If either the driving or receiving circuit imposes a non-zero DC voltage, external DC blocking capacitors must be placed in series with both RF paths to prevent bias disruption or potential damage. The datasheet explicitly states this requirement in the Pin Descriptions section.
What is the return loss specification for the HMC656LP2 over its operating frequency range?
The HMC656LP2 guarantees ≥7 dB minimum return loss across DC–25 GHz at +25 °C. Typical performance reaches 12 dB, ensuring strong impedance match and low signal reflection. This value remains valid over the full −40 °C to +85 °C operating temperature range, supporting stable performance in thermally varying environments.
Is the HMC656LP2 RoHS-compliant, and what is its moisture sensitivity level?
Yes - the HMC656LP2E variant is RoHS-compliant, using low-stress injection-molded plastic and 100% matte tin lead finish. Its moisture sensitivity level is MSL1, with a maximum peak reflow temperature of 260 °C, fully compatible with standard lead-free SMT assembly processes without dry-pack requirements.
How does the attenuation tolerance of the HMC656LP2 vary with temperature?
The HMC656LP2 exhibits ±1.5 dB attenuation tolerance over its full operating temperature range (−40 °C to +85 °C). This tolerance is guaranteed and includes thermal drift, which is further quantified by a typical temperature coefficient of 0.0004 dB/°C - meaning total drift remains within ±0.032 dB across the full thermal span.
HMC656LP2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 6-TDFN Exposed Pad
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Attenuation Value:
- 10dB
- Frequency Range:
- 0 Hz ~ 25 GHz
- Power (Watts):
- -
- Impedance:
- 50 Ohms
- Grade:
- -
- Qualification:
- -
HMC656LP2 FAQ
1.How can I place an order for HMC656LP2 through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC656LP2 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 HMC656LP2 reliable?
The price and inventory of HMC656LP2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC656LP2 is usually 5 days.
3.What payment methods are accepted for HMC656LP2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC656LP2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC656LP2?
HMC656LP2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC656LP2 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 HMC656LP2?
For technical support, including HMC656LP2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC656LP2 requirements.
6.How does Aetrix verify that HMC656LP2 is sourced from the original manufacturer or authorized distributors?
All HMC656LP2 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 HMC656LP2 meets industry standards.
7.What is the process for return or replacement of HMC656LP2?
All HMC656LP2 units undergo pre-shipment inspection (PSI). If there is an issue with HMC656LP2, 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 HMC656LP2 part is unused and in its original packaging.
Return procedure for HMC656LP2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC656LP2 Tags
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