ADG779BKSZ-REEL7 - 5Ω CMOS 2:1 SPDT Switch SC-70-6 | Analog Devices
MPN: ADG779BKSZ-REEL7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.95 | $2.95 |
| 10 | $2.65 | $26.50 |
| 100 | $2.18 | $218.00 |
| 500 | $1.75 | $875.00 |
| 1,000 | $1.41 | $1,410.00 |
ADG779BKSZ-REEL7 Overview
An SPDT (Single-Pole Double-Throw) switch, also called a 2:1 analog multiplexer, is a solid-state device that routes one of two analog input signals to a common output under digital control. SPDT switches belong to the broader category of analog switches and multiplexers within interface ICs and signal-chain components, used wherever designers need to share a single ADC, amplifier, or filter across multiple sources without bulky relay-based switching.
Key features include 5Ω on-resistance with 0.75Ω on-resistance flatness (ensuring low distortion across the input signal range), greater than 200 MHz -3 dB bandwidth, fast 20 ns tON / 7 ns tOFF transitions, and bidirectional analog signal paths on every channel. The submicron CMOS process keeps quiescent current low for battery-powered instruments while still delivering high switching speed. SC-70-6 packaging provides a footprint of roughly 2.0 x 1.25 mm, ideal for space-constrained consumer, medical, and handheld designs.
The ADG779 is built on a submicron CMOS process with TTL-compatible logic inputs. Its low on-resistance and low on-resistance flatness preserve signal integrity for audio, instrumentation, and data-acquisition front ends. Designers can place it ahead of a single ADC to multiplex two sensors, route between two reference voltages, or implement a polarity-reversal switch in precision measurement chains.
Typical applications include audio signal routing in portable headsets, two-source multiplexing for handheld oscilloscopes and DMMs, USB/audio jack switching, and battery-powered instrumentation multiplexers. The wide 1.8 V to 5.5 V supply range supports direct connection to single-cell Li-ion, 3.3 V, or 5 V rails. For system design, place 0.1 µF decoupling close to VDD, keep the digital IN pin driven by a clean logic buffer, and reserve PCB space for an optional load resistor to control settling time. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes beyond the manufacturer datasheet.
Drop-in alternatives for ADG779BKSZ-REEL7 — 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-REEL7 (same form factor and footprint) — differing in -3 dB Bandwidth, Function, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ADG779BKSZ-REEL
✅ Drop-In✓ In Stock
$0.62 / Unit
View Datasheet →ADG779BKSZ-R2
✅ Drop-In📋 Reference alternative (not in catalog)
ADG779BKS-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADG779BKSZ-REEL2
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ADG779BKSZ-REEL7 Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices Inc. |
| Function | 1 Circuit IC Switch 2:1 (SPDT) |
| On-Resistance (Ron) | 5 Ω (typical 2.5 Ω) |
| On-Resistance Flatness | 0.75 Ω |
| Supply Voltage (Single) | 1.8 V to 5.5 V |
| -3 dB Bandwidth | > 200 MHz |
| Switch Time tON | 20 ns (typical), 24 ns max |
| Switch Time tOFF | 7 ns (typical) |
| Operating Temperature | -40 °C to +85 °C |
| Logic Family | CMOS, TTL-compatible input |
| Package / Case | 6-pin SC-70 (MO-203AB) |
| Mounting Type | Surface Mount |
| Packaging Type | Tape & Reel (REEL7) |
| RoHS Status | Compliant |
| Lead-Free | Yes |
| MSL Level | MSL 1 (per datasheet package qualification) |
ADG779BKSZ-REEL7 Pin Configuration
| Pin 1 | IN — Logic control input (CMOS/TTL-compatible) |
| Pin 2 | GND — Ground reference |
| Pin 3 | D — Common analog terminal (drain) |
| Pin 4 | S2 — Source terminal 2 |
| Pin 5 | S1 — Source terminal 1 |
| Pin 6 | VDD — Positive supply (1.8 V to 5.5 V) |
Typical Applications
ADG779BKSZ-REEL7 is suitable for 6 applications: Portable Audio Headset Routing, Handheld Multimeter / DMM Source Selection, USB-C / Audio Jack Switching, Battery-Powered Data Acquisition Multiplexing, Precision Measurement Polarity Reversal, Medical / Wearable Sensor Multiplexing.
Portable Audio Headset Routing
The ADG779BKSZ-REEL7 routes between headphone and microphone signals in USB-C audio dongles, Bluetooth headsets, and 3.5 mm headset adapters. Its 5Ω on-resistance and 0.75Ω flatness preserve audio fidelity without introducing audible distortion, while the 1.8 V to 5.5 V supply directly accepts single-cell Li-ion battery voltages. The 20 ns tON enables click-free channel transitions critical to consumer audio, and the SC-70-6 footprint keeps the switch beneath a 2.0 x 1.25 mm PCB area.
Recommended
Handheld Multimeter / DMM Source Selection
The ADG779BKSZ-REEL7 functions as a 2:1 input multiplexer in handheld digital multimeters, switching the measurement front end between voltage and current sense paths. Its >200 MHz bandwidth exceeds typical DMM bandwidth requirements, while the 5Ω on-resistance minimizes burden voltage in current-measurement mode. The SC-70-6 package fits compact handheld enclosures, and the 1.8 V to 5.5 V supply accepts common 3 V and 3.6 V primary cells used in portable instruments.
Recommended
USB-C / Audio Jack Switching
The ADG779BKSZ-REEL7 implements the analog switching function between USB-C SBU (sideband-use) lines and 3.5 mm headset audio jacks in smartphones and laptops. Its bidirectional analog paths support either direction of signal flow, while the CMOS logic input enables direct drive from a 1.8 V GPIO. Per the ADG779 datasheet, the 7 ns tOFF and glitch-free switching minimize pop-and-click artifacts when inserting or removing the headset.
Recommended
Battery-Powered Data Acquisition Multiplexing
The ADG779BKSZ-REEL7 multiplexes two sensors or signal sources into a single low-power ADC channel in battery-powered data acquisition systems such as wearable health monitors, environmental loggers, and IoT sensor hubs. Its submicron CMOS process keeps quiescent current low enough to preserve battery life, while the 1.8 V minimum supply supports coin-cell and single-cell Li-ion operation. The -40°C to +85°C operating range supports outdoor and industrial deployments.
Recommended
Precision Measurement Polarity Reversal
The ADG779BKSZ-REEL7 acts as a polarity-reversal switch in precision DC measurement chains, eliminating the offset errors introduced by mechanical relays. Its low on-resistance flatness (0.75Ω) minimizes gain mismatch between positive and negative cycles of the chopper-stabilized measurement, while the >200 MHz bandwidth preserves signal integrity well above the chopper frequency. The SC-70-6 package fits dense analog front-end layouts in bench-top instrumentation.
Recommended
Medical / Wearable Sensor Multiplexing
The ADG779BKSZ-REEL7 selects between two analog sensors in medical wearables such as continuous glucose monitors, pulse oximeters, and ECG patches. Its low leakage current and rail-to-rail signal handling support the small biosignal amplitudes typical of wearable applications, while the SC-70-6 footprint is small enough for sub-1 cm² wearable PCBs. Per the ADG779 datasheet, the wide 1.8 V to 5.5 V supply supports direct connection to typical wearable battery chemistries.
Recommended
Recommended Products Summary
Engineering reference data for ADG779BKSZ-REEL7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADG779BKSZ-REEL | ADG779BKSZ-R2 | ADG779BKS-REEL7 | ADG779BKSZ-REEL2 |
|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SC-70-6 (MO-203AB) | SC-70-6 (MO-203AB) - same | SC-70-6 (MO-203AB) - same | SC-70-6 (MO-203AB) - same | SC-70-6 (MO-203AB) - same |
| Function | 1x SPDT (2:1 mux) | 1x SPDT (2:1 mux) - same | 1x SPDT (2:1 mux) - same | 1x SPDT (2:1 mux) - same | 1x SPDT (2:1 mux) - same |
| On-Resistance (Ron) | 5 Ω max (2.5 Ω typ) | 5 Ω max (2.5 Ω typ) - same | 5 Ω max (2.5 Ω typ) - same | 5 Ω max (2.5 Ω typ) - same | 5 Ω max (2.5 Ω typ) - same |
| On-Resistance Flatness | 0.75 Ω | 0.75 Ω - same | 0.75 Ω - same | 0.75 Ω - same | 0.75 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 |
| -3 dB Bandwidth | > 200 MHz | > 200 MHz - same | > 200 MHz - same | > 200 MHz - same | > 200 MHz - same |
| tON / tOFF | 20 ns / 7 ns | 20 ns / 7 ns - same | 20 ns / 7 ns - same | 20 ns / 7 ns - same | 20 ns / 7 ns - same |
| Operating Temperature | -40 °C to +85 °C | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same | -40 °C to +85 °C - same |
| Reel Quantity | 3000 (REEL7) | 10000 (REEL) | 250 (R2) | 3000 (REEL7) | 250 (REEL2) |
| Unit Price (qty 1, USD) | 2.95 | 2.95 (same) | 2.95 (same) | 2.95 (same) | 2.95 (same) |
Key Differentiators
- SC-70-6 packaging in 1.8 V to 5.5 V supply range (vs ADG1408YRUZ-REEL7 (TSSOP-16, 8:1 mux))
- 0.75 Ω on-resistance flatness for low-distortion audio (vs ADG1219BRJZ-REEL7 (SOT-23-6 SPDT))
- Sub-microsecond switching for click-free audio transitions (vs TS5A3159DCKR (TI SC-70-6 SPDT))
Design Notes
Place a 0.1 µF X7R ceramic decoupling capacitor as close as possible to the VDD pin (Pin 6) and GND (Pin 2) to minimize supply noise injection into the analog signal path. For designs operating above 50 MHz -3 dB bandwidth or with high-impedance sources (>10 kΩ), add a 10 µF bulk capacitor on the supply rail near the part. Per the ADG779 datasheet, supply ripple below 50 mV p-p is recommended for low-distortion signal switching.
The SC-70-6 footprint is 2.0 x 1.25 mm. Route the analog signal traces (S1, S2, D) on a single layer with a continuous ground plane beneath to preserve the >200 MHz bandwidth. Keep digital control lines (IN) short and isolated to prevent digital switching noise from coupling into the analog path. Per Analog Devices SC-70 layout guidance, place the part at least 5 mm away from switching power supplies and high-current traces.
Do not drive the IN logic input above VDD - the ESD protection clamps to the supply rail and absolute maximum ratings are VDD + 0.3 V. In battery-powered designs where VDD can rise to 5.5 V, ensure the GPIO driving IN is rated for at least 5 V. Per the ADG779 datasheet, applying logic signals before VDD ramps up can cause high on-resistance states; sequence power and logic together for clean channel transitions.
When switching between two source impedances, the 5Ω channel on-resistance adds a series element that can interact with the load. For low-distortion audio paths, ensure the source impedance is below 1 kΩ to keep the voltage divider error below 0.5%. Per the ADG779 datasheet, the 0.75Ω on-resistance flatness keeps harmonic distortion below -90 dB when the input signal swings within the supply rails (rail-to-rail operation).
Compliance Information
RoHS and lead-free confirmed via Analog Devices product page and LCSC listing. AEC-Q100 not qualified per datasheet - choose ADG779 automotive variants if required. Halogen-free status not explicitly stated in verified data.
