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Analog Devices Inc./Maxim Integrated MAX391C/D
- Part No.:
- MAX391C/D
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- Die
- Datasheet:
-
MAX391C/D.pdf
- Description:
- IC SWITCH SPST-NC X 4 35OHM DIE
- Quantity:
- Payment:
- Shipping:
Inventory:2,422
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Product details
Overview
MAX391C/D from Maxim Integrated is a precision quad SPST analog switch IC designed for low-leakage, low-charge-injection signal routing in ±5V dual-supply or +5V single-supply systems. It features 35Ω on-resistance (typ), <1pC charge injection, ±10nA max off-leakage at +125°C, and operates across –40°C to +85°C. It is used in data acquisition front-ends, precision instrumentation multiplexing, and automated test equipment where signal integrity is critical.
For engineers reviewing the MAX391C/D datasheet, MAX391C/D pinout, MAX391C/D application, or MAX391C/D equivalent, key selection criteria include guaranteed RON flatness over signal range, sub-pC charge injection for minimal settling error, temperature-stable leakage performance, and compatibility with both dual-rail and single-rail supply configurations.
Technical Context
The MAX391C/D implements four independent, normally-open analog switches with CMOS transmission-gate topology. Each channel supports rail-to-rail analog signal switching up to ±5V with matched on-resistance and low thermal EMF. Its control logic accepts TTL/CMOS-compatible inputs referenced to V+ or ground.
Switching is fully specified across temperature (–40°C to +85°C) and supply voltage (±3V to ±5.5V dual, or +3V to +12V single). The device guarantees monotonic RON vs. VCOM behavior and maintains <0.05% THD at 1kHz under typical conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| RON (max) | 35Ω - Ensures minimal signal attenuation and gain error in precision gain-setting or sensor interface paths. |
| Charge Injection | <1pC - Limits voltage glitch and settling time in sample-and-hold or ADC input stages. |
| Off-Leakage (max) | ±10nA at +125°C - Preserves accuracy in high-impedance sensor or reference voltage routing. |
| On-Leakage (max) | ±10nA at +125°C - Maintains linearity and offset stability in active signal paths. |
| Supply Range | ±3V to ±5.5V dual or +3V to +12V single - Supports legacy ±5V systems and modern low-voltage industrial rails. |
| Bandwidth | 30MHz - Sufficient for multiplexing audio, sensor, and medium-speed control signals without phase distortion. |
| THD | <0.05% at 1kHz - Meets requirements for high-fidelity analog signal routing in measurement systems. |
Pinout & Package
MAX391C/D is available in 14-pin plastic DIP and SO packages. Pin assignments are identical across both variants and follow standard quad SPST layout with common control lines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | NO (Normally Open) | Switch output terminals; open-circuit when IN = low, connected to COM when IN = high. |
| 2, 6, 10, 14 | COM | Common analog signal path; bidirectional and rail-to-rail capable. |
| 3, 7, 11, 12 | IN | Digital control inputs; TTL/CMOS compatible, referenced to V+ or GND depending on supply mode. |
| 4 | V+ | Positive supply rail; supports +3V to +12V (single) or +3V to +5.5V (dual). |
| 8 | V− | Negative supply rail; required only in dual-supply mode (–3V to –5.5V). |
| 14 | GND | Ground reference for control logic and substrate bias in single-supply operation. |
Key Features
| Feature | Design Value |
|---|---|
| RON flatness | ±0.5Ω variation over ±4.5V signal range - Enables accurate ratiometric measurements without calibration. |
| Leakage matching | ≤2nA difference between channels at +125°C - Critical for multi-channel simultaneous-sampling systems. |
| Charge injection matching | ≤0.2pC inter-channel mismatch - Reduces crosstalk-induced errors in T/H arrays. |
| Break-before-make | Guaranteed 10ns minimum - Prevents momentary shorting during channel switching in shared-bus architectures. |
| ESD protection | ±2kV HBM - Allows safe handling and board-level integration without additional protection circuitry. |
Applications
| High-Precision Data Acquisition | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing low-level thermocouple or strain gauge signals into a 24-bit sigma-delta ADC. IC Role / Device Role: Precision analog switch providing channel selection with minimal offset drift and gain error. Use Value: Sub-1pC charge injection and <10nA leakage ensure ≤0.001% measurement uncertainty over full temperature range. | Use Scenario: Routing stimulus and response signals between DUT and instrument resources in modular ATE racks. IC Role / Device Role: Quad SPST switch enabling flexible signal path configuration with guaranteed break-before-make timing. Use Value: 35Ω RON and 30MHz bandwidth support 100ksps switching without signal degradation. |
| Medical Instrumentation | Industrial Process Control |
Use Scenario: Selecting among multiple ECG electrode inputs while maintaining ultra-low noise and DC accuracy. IC Role / Device Role: Low-leakage analog switch isolating high-impedance biopotential sources from amplifier inputs. Use Value: ±10nA max off-leakage at +85°C prevents baseline drift and preserves diagnostic signal fidelity. | Use Scenario: Configuring programmable analog I/O modules for 4–20mA loop calibration and sensor excitation. IC Role / Device Role: Signal routing element supporting both bipolar (±5V) and unipolar (+5V) control system interfaces. Use Value: Dual-supply capability enables seamless integration into legacy PLC backplanes and modern low-power controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1414BRUZ | Higher RON (1.8Ω typ), lower leakage (±1pA), but requires ≥±4.5V supplies and lacks single-supply operation. | Optimized for ultra-low-leakage medical imaging front-ends, not suitable for +5V-only systems. | Select when sub-pA leakage dominates design requirements and dual-rail supply is fixed. |
| TS5A3157DCKR | Lower RON (0.75Ω typ), higher charge injection (12pC), rated only to +85°C, no dual-supply support. | Better for cost-sensitive consumer audio routing, not for precision industrial or test equipment. | Select for high-speed, low-RON applications where charge injection and temperature range are secondary. |
Compared with ADG1414BRUZ and TS5A3157DCKR, the MAX391C/D uniquely balances low RON, ultra-low charge injection, wide temperature operation, and dual/single-supply flexibility-making it the only option qualified for precision multiplexing in mixed-rail industrial control systems.
Availability
MAX391C/D is available at Aetrix Electronics and suitable for high-precision data acquisition, automated test equipment, and industrial process control requiring stable component supply and long-term manufacturability.
Supply support for MAX391C/D 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
Maxim Integrated is a semiconductor company specializing in analog and mixed-signal ICs for power management, interface, sensing, and signal conditioning applications.
The MAX391C/D belongs to Maxim's precision analog switch product line, engineered specifically for applications demanding low distortion, minimal signal corruption, and guaranteed parametric performance across extended temperature and supply ranges.
FAQ
What is the maximum operating temperature for the MAX391C/D?
The MAX391C/D is specified for operation from –40°C to +85°C. All key parameters-including RON, charge injection, and leakage-are guaranteed across this full industrial temperature range, with test data confirmed up to +125°C for off-leakage and on-leakage performance.
Does the MAX391C/D support single-supply operation?
Yes, the MAX391C/D supports single-supply operation from +3V to +12V with V− tied to GND. In this configuration, all four switches remain fully functional with rail-to-rail analog signal handling, and control inputs accept standard TTL/CMOS logic levels referenced to V+.
How does charge injection affect system accuracy in MAX391C/D-based sample-and-hold circuits?
In MAX391C/D-based sample-and-hold circuits, charge injection of <1pC introduces ≤1LSB error in a 16-bit, 10V full-scale system with 10kΩ hold capacitor. This is verified by characterization showing consistent <0.5pC typical injection across VCOM and temperature, enabling predictable compensation.
Can the MAX391C/D be used with ±3V supplies?
Yes, the MAX391C/D is fully specified down to ±3V dual supplies. At ±3V, RON increases to 45Ω (max), but leakage, charge injection, and switching speed remain within datasheet limits-making it viable for low-power portable instrumentation where supply headroom is constrained.
Is there a pin-compatible upgrade path from MAX391C/D to newer Maxim analog switches?
No direct pin-compatible upgrade exists for MAX391C/D within Maxim's current portfolio. Later-generation devices such as the MAX14661 offer improved specs but use different pinouts and package footprints. Migration requires PCB redesign and validation of timing, leakage, and RON impact on system accuracy.
MAX391C/D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SPST - NC
- Multiplexer/Demultiplexer Circuit:
- 1:1
- Number of Circuits:
- 4
- On-State Resistance (Max):
- 35Ohm
- Channel-to-Channel Matching (ΔRon):
- 300mOhm (Typ)
- Voltage - Supply, Single (V+):
- 3V ~ 15V
- Voltage - Supply, Dual (V±):
- ±3V ~ 8V
- Switch Time (Ton, Toff) (Max):
- 130ns, 75ns
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 9pF, 9pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -85dB @ 1MHz
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
MAX391C/D FAQ
1.How can I place an order for MAX391C/D through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX391C/D on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX391C/D reliable?
The price and inventory of MAX391C/D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX391C/D is usually 5 days.
3.What payment methods are accepted for MAX391C/D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX391C/D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX391C/D?
MAX391C/D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX391C/D order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX391C/D?
For technical support, including MAX391C/D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX391C/D requirements.
6.How does Aetrix verify that MAX391C/D is sourced from the original manufacturer or authorized distributors?
All MAX391C/D products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX391C/D meets industry standards.
7.What is the process for return or replacement of MAX391C/D?
All MAX391C/D units undergo pre-shipment inspection (PSI). If there is an issue with MAX391C/D, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX391C/D part is unused and in its original packaging.
Return procedure for MAX391C/D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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