LTC1380IGN#PBF - 8-Ch SMBus Analog Mux, 70Ohm | Analog Devices
MPN: LTC1380IGN#PBF ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LTC1380IGN#PBF Overview
An analog multiplexer (mux) is a switching IC that selects one of several analog input signals and routes it to a single output under digital control, making it a foundational block in the signal-switching hierarchy: multiplexer switch IC -> analog switch -> data conversion front end -> signal chain. Unlike electromechanical relays, CMOS muxes such as the LTC1380 switch in microseconds, consume microamp-level power, and integrate the decode logic on-chip.
Key differentiating features include the SMBus-compatible serial interface that requires only two wires (SCL and SDA), four hard-wired SMBus addresses selectable with two external address pins, and the Pb-free (RoHS) SSOP-16 package indicated by the #PBF suffix. The extremely low 10 uA supply current makes the part well suited to battery-powered and remotely powered data-acquisition systems.
Architecturally, the LTC1380 uses CMOS transmission-gate switches driven by an on-chip decode stage controlled by the serial port. Break-before-make switching prevents momentary shorting of selected channels, and the 70 ohm on-resistance keeps insertion loss low in moderate-impedance signal paths. The wide 2.7 V to +/-5 V supply capability supports both single-supply 3 V/5 V logic systems and dual-supply analog domains for bipolar signals.
Typical applications include industrial data-acquisition front ends, battery-powered sensor monitoring, automatic test equipment channel routing, and general-purpose analog signal selection in embedded systems with an SMBus or I2C-compatible controller.
Design-wise, keep the off-channels' source impedance low and add an op-amp buffer after the mux output if the downstream load is capacitive or high-value, because the 70 ohm RON combines with load current to create gain error.
This page synthesizes distributor pricing context, drop-in alternatives, pin/package guidance, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for LTC1380IGN#PBF — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LTC1380IGN#TRPBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1380IGN
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1380CGN#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
LTC1380IGN#PBF Maximum Ratings & Electrical Characteristics
| Function | Analog Multiplexer |
| Configuration | Single-Ended 8-Channel (8:1) |
| Circuits | 1 |
| On-Resistance (RON) | 70 Ohm |
| Supply Voltage Range | 2.7 V to +/-5 V |
| Supply Current | 10 uA |
| Digital Interface | SMBus compatible (2-wire: SCL, SDA) |
| Hard-Wired SMBus Addresses | 4 (selectable via 2 address pins) |
| Switching Architecture | CMOS transmission gate, break-before-make |
| Temperature Grade | Industrial |
| Number of Terminals | 16 |
| Package | SSOP-16 |
| Mounting Type | Surface Mount |
| Pb-Free Status | Yes (#PBF suffix) |
| RoHS Status | Compliant |
LTC1380IGN#PBF ssop-16 Pin Configuration Guide
Pin configuration for LTC1380IGN#PBF (ssop-16 package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for LTC1380IGN#PBF.
Refer to the datasheet for full pin configuration.
Typical Applications
LTC1380IGN#PBF is suitable for 6 applications: Industrial Data Acquisition Front Ends, Battery-Powered Sensor Monitoring, Automatic Test Equipment Channel Routing, Embedded Systems Analog Signal Selection, Building and Process Monitoring Panels, Audio and Signal Routing in Instrumentation.
Industrial Data Acquisition Front Ends
In industrial data-acquisition systems, dozens of sensors such as thermistors, pressure transducers, and 4-20 mA-derived voltages must be digitized, but dedicating one ADC channel per sensor is costly. The LTC1380IGN#PBF solves this by multiplexing eight single-ended channels into one converter input under SMBus control, requiring only two wires (SCL and SDA) from the system controller. Its 70 ohm on-resistance introduces negligible error when sensor source impedances are moderate, and the 2.7 V to +/-5 V supply range allows direct interface with 3.3 V/5 V logic or dual-rail analog domains for bipolar industrial signals. Four hard-wired SMBus addresses let four LTC1380 devices share one bus, expanding the channel count to 32 mux inputs with no extra controller pins. The 10 uA supply current keeps a powered cabinet's standby consumption low, and the industrial temperature grade suits factory-floor ambient conditions.
Recommended
Battery-Powered Sensor Monitoring
Portable and remote-monitoring instruments live or die by their sleep-mode current, and the LTC1380IGN#PBF draws only 10 uA of supply current, making its contribution to the energy budget essentially negligible. In a battery logger, eight sensor channels (temperature, humidity, cell voltages) are multiplexed into a single micropower ADC; the SMBus two-wire interface shares the bus already used by the controller and other I2C peripherals, so no additional microcontroller pins are consumed. The 2.7 V supply floor means the mux keeps switching down to the end-of-discharge voltage of a single lithium cell stack. Because the 70 ohm switch resistance would attenuate signals into heavy loads, the mux output should feed a high-impedance buffer amplifier before the converter. The #PBF lead-free construction supports green-product compliance for consumer and environmental monitoring devices deployed worldwide.
Recommended
Automatic Test Equipment Channel Routing
Automatic test equipment and rack instruments need to route many test points to a small number of measurement engines. The LTC1380IGN#PBF provides digitally addressable 8:1 selection with break-before-make CMOS switching, so two signal sources are never momentarily shorted during channel transitions - important when measuring powered nodes. The SMBus-compatible interface lets an instrument controller select channels with two wires across the backplane, and the four hard-wired addresses (set by two pins) allow up to 32 selectable inputs per bus segment. The 70 ohm path resistance is low and consistent enough for functional and continuity tests at moderate currents, while the 2.7 V to +/-5 V supply range covers both logic-level test fixtures and bipolar analog measurement domains. The SSOP-16 surface-mount package occupies minimal fixture PCB area, and tube packaging suits low-volume instrument builds.
Recommended
Embedded Systems Analog Signal Selection
General-purpose embedded designs frequently need to share one precision resource - an ADC input, a filter, or a gain stage - among several analog sources. The LTC1380IGN#PBF integrates the channel decode logic and SMBus port, so the microcontroller selects a channel with a two-byte bus write rather than dedicating three or four GPIOs to parallel mux control. This simplifies firmware and preserves scarce I/O on pin-limited MCUs. With a 70 ohm on-resistance, the mux works cleanly ahead of high-impedance ADC inputs and Sallen-Key filter stages, and the 2.7 V minimum supply matches modern 3.3 V microcontroller rails directly. Four selectable SMBus addresses let one bus manage several muxes, for example one bank for sensor inputs and another for reference calibration sources, all from a single I2C peripheral instance.
Recommended
Building and Process Monitoring Panels
Building-management and process-monitoring panels aggregate many slow-moving analog signals - temperature loops, humidity transmitters, tank levels - into one controller. The LTC1380IGN#PBF multiplexes eight such single-ended channels per device into a shared measurement path over an SMBus two-wire link, which tolerates longer board-level runs than a ribbon of parallel select lines. Its 10 uA consumption supports always-on panels, and the industrial temperature grade covers unconditioned electrical rooms and rooftop enclosures. Because most monitoring signals are high-impedance and low-frequency, the 70 ohm on-resistance produces negligible error, and the wide 2.7 V to +/-5 V supply range allows direct operation from a single 5 V panel rail. Four hard-wired addresses let a single controller address four mux chips, covering 32 sensing points per bus without extra wiring.
Recommended
Audio and Signal Routing in Instrumentation
Bench instruments, audio analyzers, and mix-and-route accessories can use the LTC1380IGN#PBF as a digitally controlled single-ended signal selector. The CMOS transmission-gate architecture with break-before-make switching avoids clicks and momentary shorts when changing sources, which matters for audible artifacts and measurement continuity. With +/-5 V supplies, the mux passes bipolar audio-band signals centered on ground, and its 70 ohm series resistance is small relative to typical line-level impedances (10 kilo-ohm and above), yielding under 0.01 percent insertion loss. Channel selection over SMBus requires only two wires, letting a small microcontroller or front-panel MCU manage source selection without a parallel control bus. Designers should follow the mux with a buffer stage to drive cables, since the 70 ohm path cannot drive heavy or capacitive loads directly.
Recommended
Recommended Products Summary
Engineering reference data for LTC1380IGN#PBF — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LTC1380IGN#TRPBF | LTC1380IGN | LTC1380CGN#PBF |
|---|---|---|---|---|
| Package | SSOP-16 | SSOP-16 - same | SSOP-16 - same | SSOP-16 - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Channel Configuration | Single-ended 8:1 | Single-ended 8:1 | Single-ended 8:1 | Single-ended 8:1 |
| Supply Voltage Range | 2.7 V to +/-5 V | 2.7 V to +/-5 V | 2.7 V to +/-5 V | 2.7 V to +/-5 V |
| Temperature Grade | Industrial | Industrial | Industrial | Commercial |
| Lead-Free / RoHS | Yes / Compliant (#PBF, tube) | Yes / Compliant (#TRPBF, tape & reel) | No (leaded base part) | Yes / Compliant (#PBF) |
Key Differentiators
- Two-wire SMBus control with four hard-wired addresses (vs LTC1380IGN#TRPBF (parallel-select competitive muxes))
- Extremely low 10 uA supply current (vs LTC1380CGN#PBF)
- Lead-free SSOP-16 with production-ready reel option (vs LTC1380IGN)
Design Notes
The 70 ohm on-resistance of the LTC1380 forms a divider with any load impedance. Estimated: with a 10 kilo-ohm load the attenuation is 70/(10700) = 0.65 percent, but with a 1 kilo-ohm load it rises to about 6.5 percent. Keep the downstream load above roughly 100 kilo-ohms, or buffer the COM output with a high-input-impedance op-amp, to hold gain error and channel-to-channel RON mismatch negligible in measurement paths.
Place 100 nF ceramic decoupling capacitors directly at the V+ pin of each SSOP-16 mux, and if running dual +/-5 V rails, decouple each rail separately. Tie unused address pins deliberately (not floating) to define one of the four hard-wired SMBus addresses, and use pull-up resistors on SCL/SDA sized for the bus capacitance so the two-wire interface meets SMBus rise-time requirements across the backplane.
Do not exceed the 2.7 V to +/-5 V supply range, and ensure the analog signal on any channel stays within the supply rails - signals below V- clamp through the CMOS structure. Remember the #PBF versus non-#PBF distinction when releasing a RoHS BOM: the LTC1380IGN base part is the leaded variant. For automated assembly, order the LTC1380IGN#TRPBF tape-and-reel option instead of tube packaging to avoid feeder conversion.
Compliance Information
#PBF suffix denotes Pb-free construction per Analog Devices; distributor listings classify the part as RoHS-compliant. REACH, halogen-free, and conflict-minerals status not stated in the provided data.
