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Analog Devices Inc. HMC646LP2E
- Part No.:
- HMC646LP2E
- Manufacturer:
- Analog Devices Inc.
- Category:
- RF Switches
- Package:
- 6-TDFN Exposed Pad
- Datasheet:
-
HMC646LP2E.pdf
- Description:
- IC RF SWITCH SPDT 2.1GHZ 6DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,581
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Product details
Overview
HMC646LP2E from Analog Devices (formerly Hittite Microwave) is a GaAs MMIC SPDT RF switch in a 2×2 mm DFN package, designed for high-power T/R and LNA protection in 0.1–2.1 GHz systems. It delivers +46 dBm input P0.1dB on Tx, 0.4 dB typical insertion loss, +74 dBm IIP3, failsafe Tx-on operation when unpowered, and supports 40 W peak power with <10% duty cycle - ideal for TD-SCDMA/3G repeaters and satellite terminals.
For engineers reviewing the HMC646LP2E datasheet, HMC646LP2E pinout, HMC646LP2E application, or HMC646LP2E equivalent, key selection criteria include failsafe topology, 50 Ω DC-coupled ports, single positive control (0/+5 V), thermal robustness (14.75 °C/W), and RoHS-compliant matte Sn finish.
Technical Context
The HMC646LP2E implements a monolithic GaAs MMIC architecture with integrated failsafe biasing, enabling automatic Tx-to-RFC path activation at zero control voltage. Its DC-coupled 50 Ω ports (RFC, Tx, Rx) eliminate external blocking capacitors in matched RF paths, while the ACG pin requires an external ground capacitor for internal bias stabilization.
Switching is controlled by a single logic-compatible voltage (0/+5 V) applied to Vctl, with tON/tOFF ≤ 320 ns and tRISE/tFALL ≤ 100 ns. The device operates across three defined bands - 869–960 MHz, 1525–1661 MHz, and 2010–2025 MHz - each with validated insertion loss, isolation, and IP3 performance per application circuit tuning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Frequency Range | 0.1–2.1 GHz operational bandwidth, validated across 869–960 / 1525–1661 / 2010–2025 MHz bands with tuned matching networks |
| Insertion Loss (Tx–RFC) | 0.4 dB typical - enables minimal signal attenuation in high-power transmit paths |
| IIP3 (Tx–RFC) | +74 dBm typical - supports high-linearity operation with two-tone +17 dBm inputs |
| P0.1dB (Tx–RFC) | +46 dBm typical - handles up to 40 W peak RF power (<10% duty cycle) without compression |
| Isolation (RFC–Rx) | 28 dB typical - ensures sufficient receive-path suppression during transmit mode |
| Control Voltage | 0/+5 Vdc single-supply logic interface - compatible with standard CMOS/TTL drivers without level shifting |
| Failsafe Behavior | Tx path enabled at Vctl = 0 V - maintains critical transmit functionality during power loss or control failure |
| Thermal Resistance | 14.75 °C/W (Tx port) - enables reliable 4.4 W continuous dissipation with proper PCB ground paddle soldering |
Pinout & Package
Package: 2×2 mm, 6-lead leadless DFN with exposed metal paddle (RoHS-compliant matte Sn finish, MSL1, 260 °C peak reflow). All ground leads and paddle must be soldered to PCB RF ground per Hittite land pattern guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Tx | Transmit RF port | DC-coupled 50 Ω output; rated for +46 dBm P0.1dB and 4.4 W continuous dissipation |
| 2 - N/C | No-connect terminal | Internally unused; must remain unconnected and unstubbed on PCB |
| 3 - ACG | Analog control ground | Requires external capacitor to RF ground (e.g., 100 nF) for internal bias stability |
| 4 - Rx | Receive RF port | DC-coupled 50 Ω input; +20 dBm P0.1dB rating, 4.4 W max dissipation |
| 5 - Vctl | Control voltage input | Single logic input (0/+5 V) determining RFC→Tx (Vctl=0 V) or RFC→Rx (Vctl=5 V) path |
| 6 - RFC | Common RF port | DC-coupled 50 Ω antenna/common port; bidirectional signal routing under control logic |
| GND (paddle) | RF and thermal ground | Exposed metal bottom pad - mandatory connection to solid PCB ground plane for RF return and heat sinking |
Key Features
| Feature | Design Value |
|---|---|
| Failsafe Tx-on default | Ensures uninterrupted transmit path during system power-down or controller fault - critical for emergency comms and telematics |
| DC-coupled 50 Ω ports | Eliminates need for external DC blocking capacitors at RFC, Tx, and Rx - reduces BOM count and layout area |
| High linearity (+74 dBm IIP3) | Minimizes intermodulation distortion in multi-carrier TD-SCDMA and 3G base station front-ends |
| Robust thermal design | 14.75 °C/W junction-to-case resistance enables 4.4 W continuous dissipation with standard 4-layer PCB grounding |
| Single positive control | 0/+5 V logic interface simplifies driver design and eliminates negative supply or level-shifter requirements |
| RoHS-compliant packaging | Matte Sn finish and low-stress plastic body meet IPC/JEDEC MSL1 standards for lead-free assembly |
Applications
| LNA Protection | T/R Switching in 3G Infrastructure |
|---|---|
|
Use Scenario: Protecting low-noise amplifier inputs from high-power transmit leakage in FDD transceivers. IC Role / Device Role / Timing Role: SPDT switch placed between antenna and LNA/Tx paths, routing RF to Tx during transmission and to LNA during reception. Use Value: +46 dBm P0.1dB and failsafe Tx-on prevent LNA damage during unexpected power loss or control glitches. |
Use Scenario: Bidirectional RF path switching in TD-SCDMA base station repeaters and small cells. IC Role / Device Role / Timing Role: High-isolation SPDT switch managing antenna duplexing where separate Tx/Rx antennas are impractical. Use Value: 28 dB typical RFC–Rx isolation and +74 dBm IIP3 maintain adjacent-channel rejection and spectral purity in dense multi-carrier environments. |
| Satellite Subscriber Terminals | Automotive Telematics |
|
Use Scenario: Transmit/receive switching in mobile satellite communication terminals operating in L/S-band. IC Role / Device Role / Timing Role: Front-end switch enabling shared antenna use between uplink (Tx) and downlink (Rx) paths in compact terminals. Use Value: 0.4 dB Tx–RFC insertion loss preserves link budget; 2×2 mm DFN footprint minimizes PCB real estate in space-constrained designs. |
Use Scenario: Antenna switching in vehicle-mounted LTE/V2X telematics modules supporting multiple frequency bands. IC Role / Device Role / Timing Role: Band-selectable SPDT switch routing antenna signals between cellular modem and GNSS receiver or DSRC/V2X transceiver. Use Value: -40 to +85 °C operating range and failsafe behavior ensure reliable operation during engine-off battery drain or cold cranking events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPDT RF switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Qorvo QM11036 | 0.7–2.7 GHz range; +42 dBm P0.1dB; 0.5 dB insertion loss; requires dual-polarity control (0/–3 V) | Broader frequency coverage but lower power handling; not failsafe - defaults to open state at Vctl=0 | Select QM11036 only if wider band coverage outweighs need for failsafe operation and higher Tx power capability. |
| Skyworks SKY13370-374LF | 0.1–2.5 GHz; +40 dBm P0.1dB; 0.6 dB insertion loss; +65 dBm IIP3; 0/+3 V control | Lower linearity and power rating; smaller 1.5×1.5 mm package; no failsafe behavior | Choose SKY13370-374LF for space-constrained consumer-grade designs where failsafe is non-critical and power demands are moderate. |
Compared with QM11036 and SKY13370-374LF, the HMC646LP2E uniquely combines failsafe Tx-on operation, +46 dBm power handling, and +74 dBm IIP3 - making it the only option among the three qualified for mission-critical LNA protection and high-power 3G infrastructure T/R switching.
Availability
HMC646LP2E is available at Aetrix Electronics and suitable for TD-SCDMA infrastructure, satellite subscriber terminals, and automotive telematics requiring stable component supply, long-term lifecycle support, and RoHS-compliant manufacturing.
Supply support for HMC646LP2E 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 continues its legacy of high-performance RF MMIC solutions for defense, communications, and instrumentation markets.
The HMC646LP2E belongs to Hittite's GaAs SPDT switch product line, engineered specifically for high-power, failsafe T/R and LNA protection in wireless infrastructure and mobile satellite terminals.
FAQ
What is the failsafe behavior of the HMC646LP2E?
The HMC646LP2E features intrinsic failsafe operation: when Vctl = 0 V (unpowered or logic-low), the Tx path (RFC → Tx) is automatically enabled, ensuring continuous transmit functionality during control power loss. This behavior is hardwired in the GaAs MMIC topology and does not require external circuitry. The HMC646LP2E maintains this state across its full –40 to +85 °C operating range and is verified per the truth table in the official datasheet.
Can the HMC646LP2E operate with control voltages other than 0/+5 V?
Yes - the HMC646LP2E supports Vctl from 0 to Vdd (+3 V to +8 V), with guaranteed operation at 0/+5 V. Its control input tolerances are ±0.2 Vdc, and it remains functional across the full specified Vdd range (up to +10 V). However, the +74 dBm IIP3 and +46 dBm P0.1dB are characterized at Vdd = 5 V and Vctl = 0/+5 V; performance may vary outside those conditions. The HMC646LP2E datasheet provides IP3 vs. voltage curves for 915/1600/2015 MHz tuning.
Is DC blocking required at the RFC, Tx, and Rx ports of the HMC646LP2E?
No - all three RF ports (RFC, Tx, Rx) are DC-coupled and internally matched to 50 Ω, eliminating the need for external DC blocking capacitors in properly biased circuits. However, the ACG pin requires an external capacitor to ground (e.g., 100 nF) to stabilize internal bias nodes. The HMC646LP2E evaluation circuits confirm DC-coupled operation across all validated frequency bands (869–960, 1525–1661, 2010–2025 MHz).
What thermal considerations apply to the HMC646LP2E in high-power operation?
The HMC646LP2E has a thermal resistance of 14.75 °C/W (junction-to-case) and supports 4.4 W continuous dissipation on the Tx port. To achieve this, the exposed metal paddle must be fully soldered to a low-impedance PCB ground plane using ≥6 thermal vias. The HMC646LP2E datasheet specifies maximum channel temperature of 150 °C and operating ambient range of –40 to +85 °C - derating is required above +85 °C ambient.
How does the HMC646LP2E differ from the non-RoHS HMC646LP2 variant?
The HMC646LP2E uses RoHS-compliant matte Sn lead finish and low-stress injection-molded plastic with MSL1 rating (260 °C peak reflow), whereas the HMC646LP2 uses Sn/Pb solder finish and has MSL1 rating at 235 °C. Electrically and thermally, both variants are identical - same pinout, specs, and package dimensions. The HMC646LP2E marking is "646" followed by a 3-digit lot code; the HMC646LP2 uses identical marking. Both share the same absolute maximum ratings and application circuits.
HMC646LP2E Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 6-TDFN Exposed Pad
- Packaging:
- Strip
- Product Status:
- Active
- RF Type:
- Cellular, TD-SCDMA
- Topology:
- Reflective
- Circuit:
- SPDT
- Frequency Range:
- 100MHz ~ 2.1GHz
- Isolation:
- 32dB
- Insertion Loss:
- 1.3dB
- Test Frequency:
- 2.025GHz
- P1dB:
- -
- IIP3:
- 34dBm
- Features:
- -
- Impedance:
- 50Ohm
- Voltage - Supply:
- 3V ~ 8V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-DFN (2x2)
HMC646LP2E FAQ
1.How can I place an order for HMC646LP2E through Aetrix?
Please submit a Request for Quotation (RFQ) for HMC646LP2E 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 HMC646LP2E reliable?
The price and inventory of HMC646LP2E are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HMC646LP2E is usually 5 days.
3.What payment methods are accepted for HMC646LP2E?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HMC646LP2E transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HMC646LP2E?
HMC646LP2E orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HMC646LP2E 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 HMC646LP2E?
For technical support, including HMC646LP2E datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HMC646LP2E requirements.
6.How does Aetrix verify that HMC646LP2E is sourced from the original manufacturer or authorized distributors?
All HMC646LP2E 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 HMC646LP2E meets industry standards.
7.What is the process for return or replacement of HMC646LP2E?
All HMC646LP2E units undergo pre-shipment inspection (PSI). If there is an issue with HMC646LP2E, 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 HMC646LP2E part is unused and in its original packaging.
Return procedure for HMC646LP2E:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HMC646LP2E Tags
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BGS12WN6E6327XTSA1
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BGS12P2L6E6327XTSA1
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BGS14PN10E6327XTSA1
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SKY13348-374LF
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PE42421SCAA-Z
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AS179-92LF
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