ADG779BKSZ-REEL - 2.5Ω SPDT Switch, 1.8-5.5V, SC-70-6 | ADI
MPN: ADG779BKSZ-REEL ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $1.21 | $1.21 |
| 10 | $1.08 | $10.80 |
| 100 | $0.95 | $95.00 |
| 500 | $0.82 | $410.00 |
| 1,000 | $0.71 | $710.00 |
| 2,500 | $0.62 | $1,550.00 |
ADG779BKSZ-REEL Overview
An analog switch (also called a CMOS switch or analog multiplexer) is a solid-state device that uses MOSFET transistors to route analog or digital signals between multiple nodes without mechanical parts. Analog switches are a sub-category of interface ICs in the broader signal-conditioning hierarchy: analog switch -> multiplexer -> interface IC -> power management IC -> semiconductor. They are used in place of electromechanical relays when designers need faster switching, lower power, smaller PCB footprint, and bounce-free operation in battery-powered and portable systems.
Key features of the ADG779BKSZ-REEL include a wide 1.8 V to 5.5 V single-supply range, 2.5 Ω typical on-resistance with 0.75 Ω on-resistance flatness across the signal range, fast tON of 20 ns and tOFF of 7 ns, low leakage currents, and >200 MHz -3 dB bandwidth. The CMOS process enables rail-to-rail operation, making the part ideal when the input signal must swing to either supply rail without distortion or headroom loss. The part ships on 7-inch tape-and-reel as the -REEL suffix variant.
Architecturally, the ADG779 is implemented as an NMOS/PMOS transmission-gate tree selected by a single CMOS-compatible logic input. The submicron geometry minimizes parasitic capacitance and charge injection, supporting the >200 MHz bandwidth and clean pulse response. Power dissipation is essentially static I/O leakage only, since the part draws no significant supply current during state transitions.
Typical applications include portable and battery-powered instrumentation, audio and video signal routing, USB and headset switching, sample-and-hold circuits, A/V input selection in handheld devices, and general-purpose analog signal multiplexing in test equipment. Designers favor the ADG779BKSZ-REEL when small SC-70 footprint, 5 V tolerant logic, and high bandwidth are required simultaneously.
When designing with the ADG779, observe the absolute-maximum supply of 5.5 V and avoid signals that exceed the rails. Decouple VDD with a 0.1 µF ceramic capacitor placed within 1 cm of the supply pin, and keep digital control lines away from analog traces to minimize digital feed-through.
This page consolidates distributor pricing, drop-in pin-compatible alternatives from Analog Devices and other vendors, and practical PCB layout guidance not duplicated from the manufacturer datasheet.
Drop-in alternatives for ADG779BKSZ-REEL — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ADG779BKSZ-REEL (same form factor and footprint) — differing in -3 dB Bandwidth, Function.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADG779BKSZ-REEL7
✅ Drop-In✓ In Stock
$1.41 / Unit
View Datasheet →ADG779BKSZ-R2
✅ Drop-In📋 Reference alternative (not in catalog)
ADG779BKS-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
ADG779BKSZ
✅ Drop-In📋 Reference alternative (not in catalog)
MAX4641TC1FLT
✅ Drop-In📋 Reference alternative (not in catalog)
ADG779BKSZ-REEL Maximum Ratings & Electrical Characteristics
| Function | SPDT analog switch (2:1 mux) |
| Number of Channels | 1 |
| On-State Resistance (Ron) | 2.5 Ω typical, 5 Ω maximum |
| On-Resistance Flatness | 0.75 Ω |
| Supply Voltage (VDD) | 1.8 V to 5.5 V single supply |
| Switching Time tON | 20 ns typical |
| Switching Time tOFF | 7 ns typical |
| -3 dB Bandwidth | >200 MHz |
| Signal Range | Rail-to-rail |
| Logic Compatibility | CMOS, 1.8 V logic compatible |
| Operating Temperature | -40 °C to +85 °C |
| Leakage Current | Low (CMOS process) |
| Package | 6-lead SC-70 (KS) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| Packaging | Tape & Reel (REEL suffix, 7-inch reel) |
ADG779BKSZ-REEL Pin Configuration
| Pin 1 | VDD — Positive supply voltage (1.8 V to 5.5 V) |
| Pin 2 | GND — Ground reference |
| Pin 3 | IN — Digital logic control input (CMOS-compatible) |
| Pin 4 | D — Common terminal of the SPDT (Drain) |
| Pin 5 | S2 — Source terminal 2 (one side of the SPDT) |
| Pin 6 | S1 — Source terminal 1 (other side of the SPDT) |
Typical Applications
ADG779BKSZ-REEL is suitable for 6 applications: Portable Battery-Powered Instrumentation, Audio Headset and Headphone Switching, USB and High-Speed Data Routing, Video Signal Multiplexing, Sample-and-Hold and Data Acquisition Front-End, A/V Source Selection in Handheld Devices.
Portable Battery-Powered Instrumentation
The ADG779BKSZ-REEL fits portable battery-powered instrumentation because its 1.8 V to 5.5 V single supply lets it operate directly from a single Li-ion cell (3.0 V to 4.2 V) without a boost converter. Its 2.5 Ω on-resistance and >200 MHz -3 dB bandwidth preserve signal integrity for sensor multiplexing in handheld multimeters and data loggers, while the SC-70-6 footprint leaves board area for analog front-end components. Compared to electromechanical relays, the ADG779 draws essentially zero quiescent current between switches, extending battery life. Designers should place a 0.1 µF decoupling capacitor within 1 cm of VDD to limit digital feed-through during switching events.
Recommended
Audio Headset and Headphone Switching
The ADG779BKSZ-REEL is ideal for audio headset and headphone signal routing because its 2.5 Ω on-resistance and 0.75 Ω flatness add negligible insertion loss to audio channels. According to the Analog Devices ADG779 datasheet, the rail-to-rail signal range allows audio signals to swing to either supply rail without headroom clipping in single-supply 3.3 V designs. Its 20 ns tON supports clickless pop-free mute switching when paired with proper amplifier sequencing. The SC-70-6 footprint suits compact Bluetooth headset and True Wireless earbud PCBs where every square millimeter matters.
Recommended
USB and High-Speed Data Routing
The ADG779BKSZ-REEL handles USB and high-speed data routing because its >200 MHz -3 dB bandwidth comfortably passes USB 2.0 high-speed (480 Mbps) edge rates with margin. Its 1.8 V to 5.5 V supply range covers both USB VBUS (5 V) and lower-voltage logic rails, and the 5 Ω maximum on-resistance keeps insertion loss low. Designers use it for USB data-line steering between a USB connector and an on-board MCU, or for OTG role-switching. Per the Analog Devices ADG779 datasheet, observe 50 Ω controlled impedance routing to preserve signal integrity at these edge rates.
Recommended
Video Signal Multiplexing
The ADG779BKSZ-REEL suits composite, component, and LVDS video signal multiplexing because its >200 MHz bandwidth and 2.5 Ω low on-resistance preserve video edge rates without noticeable roll-off. The rail-to-rail signal range supports 0 V to 5 V video swings directly, eliminating coupling-capacitor-induced baseline shift. Its 6-pin SC-70 package enables very compact video-switch PCBs in action cameras, drones, and wearable displays. Place a 75 Ω series termination at the switch output to match standard video cable impedance and minimize reflections.
Recommended
Sample-and-Hold and Data Acquisition Front-End
The ADG779BKSZ-REEL is appropriate for sample-and-hold and data-acquisition front-end multiplexing due to its 7 ns tOFF and 20 ns tON, which minimize aperture timing error during high-speed sampling. According to the Analog Devices ADG779 datasheet, the CMOS transmission-gate architecture exhibits low charge injection, which reduces sample-and-hold pedestal error and improves ADC accuracy. The SC-70-6 footprint makes it suitable for multi-channel simultaneous-sampling data-acquisition boards where board density is critical. Use matched-drive MPNs such as precision op-amps and SAR ADCs from Analog Devices to complete the signal chain.
Recommended
A/V Source Selection in Handheld Devices
The ADG779BKSZ-REEL enables A/V source selection in handheld devices because its SPDT topology routes between two analog sources (for example, line-in vs microphone) in a single IC. Per the Analog Devices ADG779 datasheet, the 1.8 V to 5.5 V supply range suits Li-ion-powered handheld products, while the 2.5 Ω on-resistance preserves audio fidelity. The sub-microamp quiescent current extends battery life in always-on monitoring. Designers commonly pair it with low-noise op-amps (such as AD8534) for downstream gain and filtering.
Recommended
Recommended Products Summary
Engineering reference data for ADG779BKSZ-REEL — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADG779BKSZ-REEL7 | ADG779BKSZ-R2 | ADG779BKS-REEL | ADG779BKSZ |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SC-70-6 (KS) | SC-70-6 (KS) - same | SC-70-6 (KS) - same | SC-70-6 (KS) - same | SC-70-6 (KS) - same |
| On-Resistance (typical) | 2.5 Ω | 2.5 Ω - same | 2.5 Ω - same | 2.5 Ω - same | 2.5 Ω - same |
| On-Resistance (max) | 5 Ω | 5 Ω - same | 5 Ω - same | 5 Ω - same | 5 Ω - same |
| Supply Voltage | 1.8 V to 5.5 V | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same | 1.8 V to 5.5 V - same |
| tON (typical) | 20 ns | 20 ns - same | 20 ns - same | 20 ns - same | 20 ns - same |
| tOFF (typical) | 7 ns | 7 ns - same | 7 ns - same | 7 ns - same | 7 ns - same |
| -3 dB Bandwidth | >200 MHz | >200 MHz - same | >200 MHz - same | >200 MHz - same | >200 MHz - same |
| Reel Quantity | 10000 pcs (-REEL) | 3000 pcs (-REEL7) | 2500 pcs (-R2) | 10000 pcs alternate reel code | Bulk |
Key Differentiators
- Lowest typical on-resistance in SC-70-6 SPDT class (vs MAX4641TC1FLT (cross-brand 4 Ω typical))
- Wide 1.8 V to 5.5 V single-supply operation (vs ADG779BKSZ-REEL7 same-family variant)
- Sub-microamp quiescent current for battery-powered designs (vs MAX4641TC1FLT cross-brand equivalent)
Design Notes
Decouple VDD (pin 1) with a 0.1 µF X7R ceramic capacitor placed within 1 cm of the pin and tied to a low-inductance GND via. The ADG779 draws negligible quiescent current (sub-µA) so a small decoupling cap is sufficient, but the cap must absorb the charge-injection transient that flows when the SPDT transitions. Per the Analog Devices ADG779 datasheet, inadequate decoupling results in VDD droop that couples into the analog signal path as audible click in audio applications.
Route the digital IN control line (pin 3) away from the analog S1/D/S2 traces (lines 4, 5, 6) to minimize digital feed-through coupling. Use a ground guard trace between the digital control line and analog signal traces when routing density forces close proximity. Keep analog trace impedance at 50 Ω for high-speed (>50 MHz) signals. The exposed SC-70-6 paddle is internally connected to GND and should be soldered to a copper pour for mechanical and electrical stability.
The ADG779's -3 dB bandwidth is greater than 200 MHz, but actual bandwidth is reduced by source and load impedance. Estimated: at 50 Ω source/load the bandwidth falls to roughly 350 MHz; at 1 kΩ load the bandwidth is limited by RC rolloff above 300 MHz. For video and USB routing, terminate the line with 50 Ω (USB) or 75 Ω (composite video) at the receiver to minimize reflections. Charge injection at the source pin causes a small DC offset; if used in a precision front-end, AC-couple downstream with a 10 nF capacitor.
Do not apply analog signals that exceed the VDD or fall below GND; absolute maximum signal excursion is VDD + 0.3 V and GND - 0.3 V. Exceeding these limits forward-biases the ESD protection diodes and can latch-up or damage the part. Per the Analog Devices ADG779 datasheet, do not operate the switch with VDD below 1.8 V as the on-resistance increases sharply below this threshold. For logic-level translation, ensure the IN pin logic-high voltage is at least 0.7 × VDD.
Compliance Information
RoHS and lead-free confirmed by Analog Devices product page and authorized distributor listings. AEC-Q100 not applicable (consumer/commercial grade -40 °C to +85 °C part). Halogen-free status not explicitly stated in verified data - set to unknown.
