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Analog Devices Inc./Maxim Integrated MAX321CPA+
- Part No.:
- MAX321CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX321CPA+.pdf
- Description:
- IC SWITCH SPST-NC X 2 35OHM 8DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
The MAX321CPA+ from Maxim Integrated is a precision dual-channel, normally closed (NC) SPST analog switch operating from ±3V to ±8V dual supplies. It delivers 35Ω max on-resistance, <2Ω channel-to-channel RON matching, and <4Ω RON flatness at ±5V, with fast switching (tON < 150ns, tOFF < 100ns), low leakage (<2.5nA at +85°C), and 5pC max charge injection - ideal for ±5V DAC/ADC signal routing in battery-powered test equipment.
For engineers reviewing the MAX321CPA+ datasheet, MAX321CPA+ pinout, MAX321CPA+ application, or MAX321CPA+ equivalent, key selection criteria include bipolar supply compatibility, guaranteed NC logic behavior, sub-100ns turn-off performance, low-temperature leakage stability, and DIP-8 package suitability for prototyping and legacy industrial PCBs.
Technical Context
The MAX321CPA+ implements complementary MOSFET pairs per switch with matched threshold voltages to achieve <2Ω RON matching and <4Ω RON flatness across ±3V to ±8V supplies. Its NC architecture ensures COM–NC conduction when logic input is low (IN = 0V or V−), with break-before-make timing not applicable (exclusive to MAX322).
Internal ESD protection exceeds 2000V per Method 3015.7, and all analog pins (COM, NC, NO, IN) tolerate signals from (V− − 0.3V) to (V+ + 0.3V). Supply current remains below ±200µA over temperature, enabling stable operation in ±5V systems with minimal power budget impact.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±3V to ±8V dual supply - supports standard ±5V rails and extended range for high-dynamic-range signal chains |
| On-Resistance (RON) | 35Ω max at ±5V - ensures minimal gain error and THD degradation in precision audio and instrumentation paths |
| RON Matching | <2Ω between channels - critical for differential signal switching and matched filter bank applications |
| Charge Injection | 5pC max - limits voltage glitch on sample-and-hold capacitors, preserving ADC acquisition accuracy |
| Leakage Current | <2.5nA at +85°C - maintains signal integrity in high-impedance sensor front-ends over full industrial temp range |
| Switching Speed | tON < 150ns, tOFF < 100ns - enables multiplexing of >5MHz analog signals with minimal aperture uncertainty |
| ESD Protection | >2000V per Method 3015.7 - provides robust handling margin during board assembly and field service |
Pinout & Package
MAX321CPA+ uses an 8-pin plastic DIP package (0°C to +70°C operating range), compatible with through-hole prototyping and legacy industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply rail | Accepts +3V to +8V; must be applied before V− and logic/analog signals to prevent latch-up |
| IN1 | Channel 1 logic control input | Active-low: COM1–NC1 closed when IN1 ≤ V− or ≈0V; open when IN1 ≥ V+ − 1.5V |
| COM2 | Channel 2 common terminal | Bidirectional analog node; connects to NC2 when IN2 is low; rated for ±3V to ±8V signal swing |
| NC2 | Channel 2 normally closed terminal | Conducts to COM2 when IN2 is low; isolated when IN2 is high; no internal pull-up/down |
| V− | Negative supply rail | Accepts −3V to −8V; substrate tied to V+ per chip topography - requires clean, low-impedance return path |
| IN2 | Channel 2 logic control input | Active-low: COM2–NC2 closed when IN2 ≤ V−; open when IN2 ≥ V+ − 1.5V; independent of IN1 |
| COM1 | Channel 1 common terminal | Bidirectional analog node; connects to NC1 when IN1 is low; supports 30mA continuous current |
| NC1 | Channel 1 normally closed terminal | Conducts to COM1 when IN1 is low; isolation resistance >1GΩ at +85°C ensures signal crosstalk < −72dB |
Key Features
| Feature | Design Value |
|---|---|
| Normally closed (NC) topology | Ensures fail-safe signal continuity during power loss or logic reset - critical in guidance and control systems |
| Low on-resistance flatness (<4Ω) | Maintains consistent gain and linearity across full ±3V to ±8V analog signal range, reducing harmonic distortion |
| Guaranteed low charge injection (≤5pC) | Minimizes sampling error in precision data acquisition; eliminates need for external zeroing circuitry |
| Bipolar supply operation (±3V to ±8V) | Enables direct interfacing with ±5V op-amps, DACs, and ADCs without level-shifting or rail-splitting circuits |
| 100% tested hot-temperature leakage | Validates <2.5nA COM/NC off-leakage at +85°C - ensures long-term reliability in uncooled military radio enclosures |
Applications
| Battery-Operated Test Equipment | ±5V Precision Data Acquisition |
|---|---|
|
Use Scenario: Portable multimeter front-end multiplexing analog signals from multiple sensors into a single ±5V ADC channel. IC Role / Device Role / Timing Role: Dual NC switch routes high-impedance sensor outputs while maintaining signal continuity during power cycling. Use Value: 35Ω RON and <2Ω matching preserve measurement accuracy across channels; 1.25mW total power extends battery life. |
Use Scenario: Channel selection in a 16-bit ±5V SAR ADC reference and input buffer stage. IC Role / Device Role / Timing Role: NC configuration ensures default connection to calibration reference until actively switched to signal path. Use Value: 5pC charge injection prevents reference voltage disturbance; <4Ω RON flatness avoids gain nonlinearity errors. |
| Military Radio Signal Routing | Heads-Up Display (HUD) Video Switching |
|
Use Scenario: Selecting between primary and backup RF receive paths in a ruggedized handheld transceiver. IC Role / Device Role / Timing Role: Dual NC switch provides fail-safe default path; fast tOFF < 100ns enables rapid reconfiguration during jamming events. Use Value: 2000V ESD rating withstands field handling; −40°C to +85°C variants available (EPA), though CPA suits controlled environments. |
Use Scenario: Multiplexing RGB video signals from multiple sources (e.g., navigation computer and radar overlay) into HUD projection optics. IC Role / Device Role / Timing Role: Bidirectional NC switches route composite analog video with minimal crosstalk and group delay variation. Use Value: 72dB off-isolation and 85dB crosstalk suppress ghosting; 9pF C(OFF) minimizes bandwidth roll-off at 10MHz video frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel NC analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX321ESA+ | SO-8 package, −40°C to +85°C temp range, identical electrical specs | Suitable for surface-mount production; requires PCB redesign from DIP footprint | Select for automated assembly and extended temperature operation where board space is constrained |
| ADG1411BRZ | Single-supply only (±15V max), 1.8Ω typical RON, 120ns tON, SO-16 package | Requires level-shifting for ±5V systems; higher channel count but larger footprint | Choose only if lower RON and wider supply range justify redesign and added complexity |
Compared with MAX321CPA+, MAX321ESA+ offers identical performance in a compact SO-8 package for modern SMT lines, while ADG1411BRZ trades bipolar simplicity for lower on-resistance and higher integration - neither is pin-compatible, and both require layout changes and signal conditioning adjustments.
Availability
MAX321CPA+ is available at Aetrix Electronics and suitable for battery-operated test equipment, ±5V precision data acquisition, military radio signal routing, and heads-up display video switching requiring stable component supply and long-lifecycle support.
Supply support for MAX321CPA+ 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 (now part of Analog Devices) designs high-performance analog and mixed-signal ICs for industrial, communications, and automotive markets, with emphasis on precision, low-power, and rugged operation.
The MAX321CPA+ belongs to the MAX320/MAX321/MAX322 family of precision dual-supply SPST analog switches, engineered specifically for low-distortion, low-glitch signal routing in ±5V instrumentation and military-grade portable electronics.
FAQ
What is the logic polarity of the MAX321CPA+ switches?
The MAX321CPA+ features active-low logic control: each switch conducts (COM–NC closed) when its corresponding IN pin is driven low (≤ V− or ≈0V), and opens when IN is high (≥ V+ − 1.5V). This NC behavior ensures default signal continuity during power-down or logic reset - a key safety feature confirmed in the truth table and functional diagrams for MAX321CPA+.
Does the MAX321CPA+ support single-supply operation?
No, the MAX321CPA+ is specified exclusively for dual-supply operation from ±3V to ±8V. It lacks internal level-shifting or charge-pump circuitry required for true single-supply use. For single-supply alternatives, Maxim recommends the MAX323/MAX324/MAX325 series - the MAX321CPA+ datasheet explicitly excludes single-rail functionality.
What is the maximum analog signal voltage range supported by the MAX321CPA+?
The MAX321CPA+ supports analog signals from (V− − 0.3V) to (V+ + 0.3V) on all COM, NC, NO, and IN pins. With ±5V supplies, this yields a usable signal range of −5.3V to +5.3V - sufficient to handle full-scale ±5V DAC outputs and ADC inputs without clipping or diode conduction, as verified in Absolute Maximum Ratings and Applications Information sections.
Is the MAX321CPA+ pin-compatible with other devices in the MAX320 family?
Yes, the MAX321CPA+ shares identical pinout and package (8-pin DIP) with MAX320CPA+ and MAX322CPA+, differing only in internal switch configuration (NC vs NO vs mixed). All three support the same supply ranges, timing, and electrical specs - enabling drop-in replacement in existing layouts when switching logic behavior is acceptable.
What thermal derating applies to the MAX321CPA+ in plastic DIP package?
The MAX321CPA+ plastic DIP package has a continuous power dissipation limit of 727mW at +70°C, derated at 9.09mW/°C above that temperature. At +85°C ambient, maximum allowable power drops to 591mW. This derating is defined in the Absolute Maximum Ratings table and applies regardless of whether the device operates at ±3V or ±8V supplies.
MAX321CPA+ 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:
- 2
- On-State Resistance (Max):
- 35Ohm
- Channel-to-Channel Matching (ΔRon):
- 300mOhm
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- ±2.7V ~ 8V
- Switch Time (Ton, Toff) (Max):
- 150ns, 100ns
- -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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX321CPA+ FAQ
1.How can I place an order for MAX321CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX321CPA+ 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 MAX321CPA+ reliable?
The price and inventory of MAX321CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX321CPA+ is usually 5 days.
3.What payment methods are accepted for MAX321CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX321CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX321CPA+?
MAX321CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX321CPA+ 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 MAX321CPA+?
For technical support, including MAX321CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX321CPA+ requirements.
6.How does Aetrix verify that MAX321CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX321CPA+ 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 MAX321CPA+ meets industry standards.
7.What is the process for return or replacement of MAX321CPA+?
All MAX321CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX321CPA+, 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 MAX321CPA+ part is unused and in its original packaging.
Return procedure for MAX321CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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