Analog Devices Inc. SMP18FSZ-REEL

Overview

SMP18FSZ-REEL from Analog Devices is an octal sample-and-hold IC with multiplexed input, internal hold capacitors, TTL/CMOS-compatible logic inputs, and break-before-make channel addressing. It delivers 0.01% linearity error, 2.5 µs acquisition time (0–10 V to 0.1%), and ±1 mV hold-mode settling. Used in multichannel data acquisition systems for calibration voltage storage and timing deskew.

For engineers reviewing the SMP18FSZ-REEL datasheet, SMP18FSZ-REEL pinout, SMP18FSZ-REEL application, or SMP18FSZ-REEL equivalent, key selection factors include droop rate (2–40 mV/s), dual/single-supply operation (±5 V or +12 V/0 V), output swing compliance (0.06 V to 10 V), and compatibility with CD4051 pinout for drop-in system upgrades.

Technical Context

The SMP18FSZ-REEL integrates eight buffer amplifiers, a 1-of-8 decoder, and internal hold capacitors referenced to VSS. Its oxide-isolated CMOS process enables low droop (2 mV/s typ), fast channel select/deselect (90 ns / 45 ns), and analog crosstalk of –72 dB across 0–10 V steps.

It supports single-supply (VDD = +12 V, VSS = 0 V) or dual-supply (VDD = +5 V, VSS = –5 V) operation, with output voltage range defined as (VSS + 0.06 V) ≤ VOUT ≤ (VDD – 2 V). Logic inputs meet TTL/CMOS thresholds (VINH ≥ 2.4 V, VINL ≤ 0.8 V) and draw ≤1 µA.

Key Specifications

Pinout & Package

Package: 16-pin narrow-body SOIC (SO-16, package option R-16A), RoHS-compliant, tape-and-reel (REEL suffix).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal sample-and-hold applications.

Compared with AD7874ARZ and MAX196BCNI+, the SMP18FSZ-REEL uniquely combines octal channel count, internal hold capacitors, CD4051 pinout, and sub-µs channel switching-making it irreplaceable for legacy-compatible, analog-first multichannel calibration systems.

Availability

SMP18FSZ-REEL is available at Aetrix Electronics and suitable for multichannel data acquisition systems, automated test equipment, and industrial process controllers requiring stable component supply across extended production lifecycles.

Supply support for SMP18FSZ-REEL 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, communications, and instrumentation markets.

The SMP18FSZ-REEL belongs to Analog Devices' precision sample-and-hold product line, engineered specifically for calibration-intensive systems where low droop, high linearity, and multiplexed channel density reduce system cost and board space.

FAQ

What supply configurations does the SMP18FSZ-REEL support?

The SMP18FSZ-REEL operates from either single supply (e.g., VDD = +12 V, VSS = 0 V) or dual supply (e.g., VDD = +5 V, VSS = –5 V), with output voltage range defined as (VSS + 0.06 V) ≤ VOUT ≤ (VDD – 2 V). Supply current ranges from 6.0 mA to 10.0 mA across –40°C to +85°C. The SMP18FSZ-REEL's internal TTL regulator maintains logic compatibility across the full supply range, and PSRR is specified at 60–75 dB.

How does the SMP18FSZ-REEL achieve its 0.01% linearity specification?

The SMP18FSZ-REEL achieves 0.01% linearity through advanced oxide-isolated CMOS fabrication, matched internal buffer amplifiers, and precision-trimmed hold capacitor networks. This specification is verified across both ±3 V and 0–10 V input ranges at +25°C and holds across –40°C to +85°C. The SMP18FSZ-REEL's linearity directly enables accurate 10-bit signal acquisition to ±1/2 LSB, making it suitable for calibration-critical instrumentation.

Can the SMP18FSZ-REEL replace a CD4051 in existing designs?

Yes-the SMP18FSZ-REEL is explicitly designed to be pin-compatible with the CD4051 multiplexer in SO-16 packages, sharing identical pin assignments for A/B/C address, INH, DGND, VDD, VSS, and output pins. However, unlike the CD4051, the SMP18FSZ-REEL adds sample-and-hold functionality with internal capacitors and break-before-make switching. No PCB changes are required, but system firmware must manage HOLD timing.

What is the maximum recommended capacitive load for SMP18FSZ-REEL outputs?

The SMP18FSZ-REEL outputs are stable with capacitive loads up to 500 pF, exhibiting <30% overshoot under step conditions. This eliminates the need for external isolation resistors in most applications. Driving larger capacitive loads may cause instability or increased settling time; for loads exceeding 500 pF, a series resistor (e.g., 10–50 Ω) should be added close to the SMP18FSZ-REEL output pin to maintain phase margin.

Does the SMP18FSZ-REEL require external hold capacitors?

No-the SMP18FSZ-REEL integrates all hold capacitors internally, referenced to the VSS pin. This eliminates component count, layout sensitivity, and capacitor aging effects associated with discrete S/H designs. The internal capacitors are optimized for low droop (2 mV/s typ) and fast acquisition, and no external hold capacitors are specified, required, or recommended in the official Analog Devices documentation for the SMP18FSZ-REEL.