MAX338CSE+ - 8-Channel CMOS Analog Multiplexer | Maxim
N.º da peça: MAX338CSE+ ✓ Ativo| Qtd. | Preço unitário | Total |
|---|---|---|
| 1 | $7.29 | $7,29 |
| 10 | $6.55 | $65,50 |
| 100 | $5.82 | $582,00 |
| 500 | $5.21 | $2.605,00 |
| 1.000 | $4.68 | $4.680,00 |
MAX338CSE+ Visão geral
What is an analog multiplexer? An analog multiplexer (MUX) is a semiconductor switch that selects one of N analog input channels and routes it to a single output line, allowing a microcontroller or ADC to "scan" many sensors or signals through a single high-performance analog front-end. Multiplexers belong to the larger family of analog switches and are foundational building blocks in data acquisition, instrumentation, audio routing, and test equipment. The MAX338 operates from a single +4.5V to +30V supply (or dual ±4.5V to ±20V supplies), giving designers wide headroom for industrial 24V rails and ±15V instrumentation racks.
Key features include low-leakage CMOS construction (typically < 1 nA at room temperature), break-before-make switching action that prevents momentary channel cross-connection, ESD protection on all logic and analog pins, and pin-compatibility with the industry-standard DG508A / DG509A, enabling direct drop-in upgrade to lower leakage. Logic inputs are TTL/CMOS compatible, simplifying interface to 3.3V and 5V microcontrollers.
The MAX338 is fabricated on a low-leakage dielectric-isolation CMOS process that minimizes parasitic capacitance and channel-to-channel charge injection. Internal logic-level translation allows the digital inputs (A0, A1, A2, EN) to be driven directly from modern microcontrollers. The device is specified over the commercial 0C to +70C temperature range, making it well suited for indoor test equipment and laboratory instrumentation rather than industrial or automotive use; for extended temperature ranges see the MAX338E variant.
Typical applications include data-acquisition front-ends scanning multiple thermocouples or analog sensors, audio signal routing in mixing consoles and broadcast equipment, automated test equipment (ATE) pin boards, instrumentation multiplexer and sample-and-hold front ends, industrial process control signal multiplexing, and medical patient-monitoring analog front ends. Designers choose it when they need more analog inputs than their ADC provides and require clean, low-leakage switching.
When designing with this device, place 0.1uF decoupling capacitors close to V+ and V- (or GND for single-supply use) and keep analog traces short to minimize crosstalk. Ensure all unused digital and analog inputs are tied to a defined logic level (not left floating) to prevent channel-to-channel leakage paths.
This page synthesizes distributor pricing, drop-in alternatives, application guidance, and pin-level design notes that complement the manufacturer datasheet.
Alternativas drop-in para MAX338CSE+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX338CSE+ (mesmo formato e footprint) — diferindo em Mounting Type, Number of Channels, Package.
Ferramenta de comparação rápida — selecione peças alternativas para comparação lado a lado:
MAX338CSE+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX338ESE+T
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX338EPE+
✅ Drop-In✓ Em estoque
$3.5439 / unidade
Ver ficha técnica →MAX328CSE+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX338CSE+ Especificações
| Função | 8:1 analog multiplexer (or dual 4:1) |
| Number of Channels | 8 single-ended or 2x4 differential |
| On-State Resistance (RON) | 400 ohm (max 650 ohm over signal) |
| Single Supply Voltage | +4.5 V to +30 V |
| Dual Supply Voltage | +/-4.5 V to +/-20 V |
| Logic Compatibility | TTL/CMOS compatible |
| Channel Leakage | Low-leakage CMOS, ~ nA typical |
| Switching Action | Break-before-make |
| Address Lines | 3-bit binary (A0, A1, A2) |
| Enable Input | Active-low EN |
| Temperatura de operação | 0 C to +70 C (commercial) |
| Encapsulamento | 16-pin Narrow SOIC (NSOIC) |
| Tipo de montagem | Surface Mount |
| Status RoHS | Compliant (Pb-free suffix '+') |
| ESD Protection | Yes (per datasheet) |
Configuração de pinos do MAX338CSE+
| Pino 1 | A0 — Address bit 0 (LSB) - TTL/CMOS logic input |
| Pino 2 | A1 — Address bit 1 - TTL/CMOS logic input |
| Pino 3 | A2 — Address bit 2 (MSB) - TTL/CMOS logic input |
| Pino 4 | EN — Active-low enable input |
| Pino 5 | S1 — Analog input channel 1 |
| Pino 6 | S2 — Analog input channel 2 |
| Pino 7 | S3 — Analog input channel 3 |
| Pino 8 | S4 — Analog input channel 4 |
| Pino 9 | S5 — Analog input channel 5 |
| Pino 10 | S6 — Analog input channel 6 |
| Pino 11 | S7 — Analog input channel 7 |
| Pino 12 | S8 — Analog input channel 8 |
| Pino 13 | D — Common analog output (drain) |
| Pino 14 | V+ — Positive analog supply |
| Pino 15 | GND — Ground (or V- for dual supply) |
| Pino 16 | NC — Not connected (or V- pin on dual-supply variant) - per datasheet NSOIC pin mapping |
Aplicações típicas
MAX338CSE+ é adequado para 6 aplicaçãos: Data Acquisition Front-End, Audio Signal Routing, Automated Test Equipment Pin Boards, Industrial Process Control Signal Routing, Medical Patient-Monitoring Analog Front End, Laboratory Instrumentation Multiplexing.
Data Acquisition Front-End
The MAX338CSE+ fits data-acquisition front-ends because its 8:1 single-ended topology lets a single ADC (such as the AD7606 or MAX1302) sequentially scan up to eight analog channels. Its 400 ohm typical on-resistance produces modest gain error when the source impedance is below ~5 kohm, while low nA-range channel leakage preserves DC accuracy for slow-moving transducer signals. In 4-wire measurement or thermocouple scanning designs the low-leakage CMOS process minimizes thermocouple-lead errors across the wide +4.5V to +30V supply range, eliminating the need for a low-leakage precision discrete alternative. The 16-pin NSOIC footprint matches typical muxer sockets or pick-and-place lines, enabling rapid board bring-up. Unlike mechanical reed-relay muxes, the MAX338CSE+ adds break-before-make switching that protects downstream sample-and-hold capacitors from momentary cross-conduction between channels.
Recomendado
Audio Signal Routing
Audio mixing consoles and broadcast routing matrices use the MAX338CSE+ because its low channel-to-channel crosstalk and break-before-make switching preserve audio fidelity during source changes. The 400 ohm on-resistance interacts cleanly with the high-impedance inputs of audio op-amps (such as the OPA2134 or TL072) without audible signal loss. Its wide +4.5V to +30V single-supply operation matches +/-15V studio rails, allowing the same mux to route line-level audio or microphone preamp outputs in 600-ohm balanced systems. Unlike electromechanical audio relays, the MAX338 introduces no click or pop during switching (when paired with proper zero-crossing detection), and its CMOS construction eliminates the coil-drive current that would otherwise require bulky mechanical switching hardware in production consoles.
Recomendado
Automated Test Equipment Pin Boards
In automated test equipment (ATE) and bench-instrument pin boards, the MAX338CSE+ provides fast solid-state switching of multiple test points back to a single measurement instrument. With TTL-compatible address inputs (A0, A1, A2), the device can be driven directly from 3.3V or 5V microcontroller GPIO without level shifters, simplifying the test-head controller firmware. Its break-before-make action prevents momentary short circuits between adjacent test points, and the 400 ohm RON adds only modest measurement error that can be calibrated out per channel. The MAX338CSE+ is well suited to production-line functional testers that scan dozens of nodes per board, replacing larger banks of reed relays with a smaller, faster, and more reliable solid-state alternative. Use it when reconfiguring test points faster than 1 ms per channel matters and the channel count is in the 2-16 range.
Recomendado
Industrial Process Control Signal Routing
Industrial process control loops use the MAX338ESE+ (the extended-temperature sibling of MAX338CSE+) to multiplex multiple 4-20 mA current-loop or 0-10V analog signals back to a single PLC analog input. When the +24V industrial rail is used to power V+, the MAX338 directly handles ground-referenced process signals from sensors measuring flow, pressure, or temperature. Although the MAX338CSE+ is rated only to 70C, designers should choose the MAX338ESE+ in -40C to +85C cabinets. The low-leakage CMOS construction avoids the calibration drift seen in legacy mechanical relays that can introduce tens of nanoamps of error after long service. In redundant-loop architectures two MAX338 parts can be used to route primary and backup sensor pairs to redundant PLC inputs for fail-safe operation.
Recomendado
Medical Patient-Monitoring Analog Front End
Patient monitoring consoles use the MAX338CSE+ to scan ECG, SpO2, respiration, and temperature channels through a single high-resolution ADC, keeping the analog signal chain short and clean. Its low channel-leakage (typically low-nA) preserves the microvolt-level ECG waveform details that mechanical relays would otherwise smear across adjacent leads. The wide supply range allows operation from +5V logic rails in compact portable patient monitors, while the NSOIC-16 footprint fits within the densely populated analog front-end area of FDA-cleared bedside units. When paired with a low-noise instrumentation amp (such as the INA128) and 24-bit sigma-delta ADC, the MAX338 supports the 0.5-150 Hz bandwidth required for diagnostic-quality ECG without contributing meaningful noise of its own.
Recomendado
Laboratory Instrumentation Multiplexing
Bench-top laboratory instruments (DMMs, source-measure units, scope add-ons) often use the MAX338CSE+ to multiplex reference voltages, calibration points, or stimulus signals back through a single precision ADC reference path. Its specified maximum +30V single-supply / +/-20V dual-supply operation matches the high-impedance ranges of bench DMMs measuring up to 200V. The 3-bit binary address interface lets a microcontroller or FPGA route any of the 8 inputs to the ADC with deterministic timing. Unlike smaller muxes such as the 74HC4051 (which has wider RON and higher leakage), the MAX338CSE+ preserves the calibration accuracy expected from instruments with 6.5-digit resolution. The NSOIC-16 footprint enables routing it onto the same small PCB module used in handheld multimeter designs.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX338CSE+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX338CSE+T | MAX338ESE+T | MAX338EPE+ | MAX328CSE+ |
|---|---|---|---|---|---|
| Package | NSOIC-16 (0.154 inch) | NSOIC-16 - same | NSOIC-16 - same | PDIP-16 - different | NSOIC-16 - same |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Channels | 8:1 / dual 4:1 | 8:1 / dual 4:1 | 8:1 / dual 4:1 | 8:1 / dual 4:1 | Differential 4:1 / dual 2:1 |
| On-Resistance (RON) | 400 ohm typ / 650 ohm max | 400 ohm typ / 650 ohm max | 400 ohm typ / 650 ohm max | 400 ohm typ / 650 ohm max | Lower (precision variant) |
| Single Supply Voltage | +4.5V to +30V | +4.5V to +30V | +4.5V to +30V | +4.5V to +30V | +4.5V to +30V |
| Operating Temperature | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C (extended) | -40 C to +85 C (extended) | 0 C to +70 C |
| Package Type | SMD (NSOIC) | SMD (NSOIC) | SMD (NSOIC) | Through-Hole (PDIP) | SMD (NSOIC) |
| Leakage / Charge Injection | Low leakage CMOS | Low leakage CMOS | Low leakage CMOS | Low leakage CMOS | Lower leak / lower charge injection |
Principais diferenciais
- Direct pin-compatible upgrade to legacy DG508A / DG509A (vs Industry-standard DG508A multiplexer)
- Wide supply voltage headroom (vs MAX398 precision 8:1 mux)
- Direct TTL/CMOS logic interface without level shifters (vs MAX328 precision 4:1 differential mux)
Notas de projeto
The MAX338 requires a 0.1uF decoupling capacitor close to V+ (pin 14). When used in dual-supply mode, bypass the V- pin to GND with another 0.1uF ceramic. The supply voltage range is +4.5V to +30V single-supply or +/-4.5V to +/-20V dual-supply. Avoid ground loops by tying the MAX338 GND (pin 15) back to the analog ground plane, not to a noisy digital return path. For best low-noise performance, power V+ from a low-impedance linear regulator such as the MAX8881 or LD1117 rather than directly from a switching converter.
Always tie unused digital address inputs (A0, A1, A2) and EN to a defined logic level (HIGH or LOW) rather than leaving them floating. Floating logic inputs can drift into the linear region, causing excessive supply current and potential channel cross-conduction. During power-up, apply logic levels only after V+ has stabilized to prevent partial switch activation. Also avoid exceeding the absolute maximum analog signal range of V+ and GND - signals beyond these rails cause latch-up that can permanently damage the device.
Keep analog input traces short and well-spaced from digital address lines to minimize capacitive crosstalk. Route the address bus (A0, A1, A2, EN) on the opposite PCB layer from the analog input/output, with a GND plane between them for shielding. Place the bypass capacitor directly at pin 14 with the shortest possible trace to the analog GND pin 15. Series resistors (100-470 ohm) on each analog input pin help dampen resonances in high-impedance source connections. Avoid running analog signal traces parallel to high-frequency digital lines for any significant length.
The 400 ohm on-resistance introduces a voltage divider with whatever load impedance you connect to pin D (output). For high-impedance ADC inputs (>1Mohm typical) the gain error is < 0.04%, but for lower-impedance loads (such as 10kohm) the loss is ~3.85% and must be budgeted. Add a unity-gain buffer (such as the MAX4230 or OPA2333) after the mux output when driving low-impedance or low-distortion stages. Channel-to-channel switching time tON/tOFF in tens of nanoseconds requires that downstream sample-and-hold circuits be triggered after the settling time has elapsed; consult the datasheet timing diagram.
Informações de conformidade
Pb-free '+' suffix confirms RoHS compliance per Maxim Integrated datasheet marking convention. Not AEC-Q100 qualified - choose MAX338ESE+ for industrial temperature range. Halogen-free status is not explicitly listed in distributor data.
