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Analog Devices Inc./Maxim Integrated MAX321CSA+
- Part No.:
- MAX321CSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX321CSA+.pdf
- Description:
- IC SWITCH SPST-NCX2 35OHM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,605
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Product details
Overview
The MAX321CSA+ from Maxim Integrated is a precision dual-supply, dual SPST analog switch with normally closed (NC) configuration, operating from ±3V to ±8V supplies. It delivers 35Ω max on-resistance, <2Ω channel-to-channel RON matching, and 100pA max off-leakage at +85°C - enabling high-fidelity signal routing in ±5V DAC/ADC interfaces and battery-powered test equipment.
For engineers reviewing the MAX321CSA+ datasheet, MAX321CSA+ pinout, MAX321CSA+ application, or MAX321CSA+ equivalent, key selection criteria include bipolar supply compatibility, guaranteed NC logic behavior, low charge injection (≤5pC), and SO-8 packaging for space-constrained industrial control and military radio front-ends.
Technical Context
The MAX321CSA+ implements complementary MOSFET pairs per channel with matched threshold voltages to achieve ≤2Ω RON mismatch and ≤4Ω RON flatness across ±3V to ±8V supplies. Its CMOS control inputs accept logic-high up to V+ and logic-low down to V−, supporting direct interface with ±5V logic families without level shifting.
Each NC switch features break-before-make isolation only in the MAX322 variant - not applicable to MAX321CSA+. The device guarantees <100pA COM-off leakage at +85°C and maintains <150ns tON / <100ns tOFF with 35pF load under ±5V operation, making it suitable for sample-and-hold circuits requiring sub-100ns settling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±3V to ±8V - supports standard ±5V systems and extended-range industrial rails without external regulators |
| On-Resistance (RON) | 35Ω max at ±5V - ensures minimal gain error and THD degradation in audio/video switching paths |
| RON Matching | <2Ω between channels - enables precise differential signal routing in guidance and control systems |
| Charge Injection | 5pC max - limits voltage glitch in sample-and-hold circuits to <1mV with 1nF hold capacitor |
| Off-Leakage Current | 100pA max at +85°C - preserves accuracy in high-impedance sensor multiplexing over temperature |
| Switching Speed | tON <150ns, tOFF <100ns - meets timing requirements for 1MHz communication channel switching |
| ESD Protection | >2000V per Method 3015.7 - eliminates need for external ESD diodes in PBX/PABX line-card designs |
Pinout & Package
MAX321CSA+ uses an 8-pin SO (Small Outline) package with 1.27mm lead pitch, rated for 0°C to +70°C operation. Pin 1 is V+, pin 4 is V−, pins 3 and 7 are logic inputs (IN1, IN2), pins 2 and 6 are common terminals (COM1, COM2), and pins 1 and 8 are NC terminals (NC1, NC2).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive supply rail | Bias source for internal P-channel FETs; must be applied before V− and logic/analog signals |
| V− | Negative supply rail | Bias source for internal N-channel FETs; sequencing after V+ prevents latch-up |
| IN1, IN2 | Digital control inputs | Active-low logic: logic '0' closes NC switch; compatible with ±5V TTL/CMOS drive levels |
| COM1, COM2 | Analog common nodes | Bidirectional current paths - may serve as input or output depending on signal flow direction |
| NC1, NC2 | Normally closed analog terminals | Connected to COMx when INx = 0; open when INx = 1 - no break-before-make timing guarantee |
Key Features
| Feature | Design Value |
|---|---|
| Low on-resistance flatness | <4Ω variation over full ±3V to ±8V analog range - maintains consistent gain in wide-dynamic-range instrumentation |
| Guaranteed charge injection | ≤5pC - enables accurate DC-coupled sampling in medical data acquisition without post-correction |
| Bipolar supply flexibility | Operates from ±3V to ±8V - supports legacy ±5V systems and newer ±3.3V/±4.5V industrial rails |
| Ultra-low leakage | <2.5nA COM-on leakage at +85°C - critical for long-integration-time photodiode or thermocouple front-ends |
| Fast switching with low power | <150ns tON, 1.25mW total dissipation - balances speed and battery life in portable test gear |
Applications
| Battery-Operated Test Equipment | ±5V Precision ADC/DAC Interfaces |
|---|---|
|
Use Scenario: Portable multimeter front-end multiplexing analog signals from multiple sensors into a single ADC channel. IC Role / Device Role / Timing Role: Dual NC switch routes high-impedance sensor outputs while maintaining signal integrity during battery voltage sag. Use Value: 100pA max leakage and 35Ω RON prevent measurement drift and offset errors across 0–+70°C operating range. |
Use Scenario: Signal conditioning path between ±5V DAC output and op-amp buffer in programmable power supply control loop. IC Role / Device Role / Timing Role: NC switch isolates DAC output during calibration cycles to prevent loading and reference disturbance. Use Value: 5pC charge injection avoids step-induced transients that would destabilize feedback loop convergence. |
| Military Radio Audio Routing | Heads-Up Display (HUD) Video Multiplexing |
|
Use Scenario: Selecting between secure voice codec output and auxiliary comms channel in handheld tactical radios. IC Role / Device Role / Timing Role: Dual NC switch provides fail-safe default connection to primary audio path when power or control fails. Use Value: >2000V ESD protection withstands field-handling events without latch-up or parameter shift in ruggedized enclosures. |
Use Scenario: Switching between primary flight data video stream and backup navigation overlay in aircraft HUD systems. IC Role / Device Role / Timing Role: NC configuration ensures continuous display feed unless overridden by system fault detection logic. Use Value: 150ns tON enables seamless transition within video blanking interval, eliminating visible flicker or tearing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual SPST analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX321ESA+ | Same electrical specs but rated for −40°C to +85°C; SO-8 package with identical footprint | Required for extended-temperature industrial or automotive under-hood use cases | Select MAX321ESA+ when operation below 0°C or above +70°C is required; otherwise MAX321CSA+ suffices |
| ADG1419BRMZ | Single-supply only (up to +36V); 3.5Ω typical RON; no bipolar support; higher 12pC charge injection | Suitable for unipolar high-voltage industrial I/O modules, not ±5V precision signal chains | Choose ADG1419BRMZ only for single-rail >12V systems where bipolar operation is unnecessary |
Compared with MAX321ESA+, the MAX321CSA+ trades extended temperature range for lower cost and qualification in commercial-grade equipment; versus ADG1419BRMZ, it provides true bipolar operation and lower charge injection essential for ±5V mixed-signal integrity.
Availability
MAX321CSA+ is available at Aetrix Electronics and suitable for battery-operated test equipment, ±5V DAC/ADC interfaces, and military radio audio routing requiring stable component supply across commercial temperature grades.
Supply support for MAX321CSA+ 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 computing applications.
The MAX320/MAX321/MAX322 family targets precision analog switching in dual-supply environments - specifically engineered for low-leakage, low-distortion signal routing in measurement and control systems.
FAQ
What is the maximum supply voltage rating for MAX321CSA+?
The MAX321CSA+ has an absolute maximum supply voltage of ±8V, with the total V+ to V− differential limited to 17V. Operation beyond these ratings risks permanent damage. For reliable long-term performance, design within ±5V nominal supplies - where the device achieves its specified 35Ω max RON, <150ns tON, and 100pA leakage. Always observe proper power sequencing: apply V+ first, then V−, before logic or analog signals.
Does MAX321CSA+ support break-before-make switching?
No, the MAX321CSA+ does not provide break-before-make functionality. That feature is exclusive to the MAX322 variant, which integrates one NO and one NC switch with guaranteed timing separation. The MAX321CSA+ contains two independent NC switches with no inter-channel timing coordination - both switch simultaneously on logic transition. Use MAX322CSA+ if break-before-make is required for signal path isolation.
What is the logic polarity of the control inputs on MAX321CSA+?
The MAX321CSA+ uses active-low logic: applying logic '0' (≤2.5V at V+ = +5V) closes the NC switch, connecting COMx to NCx; logic '1' (≥3.5V) opens the switch. Inputs tolerate voltages from V− to V+, so driving IN1/IN2 directly to V− or V+ is safe and eliminates need for external level shifters in ±5V systems.
Can MAX321CSA+ be used with single-supply systems?
No - the MAX321CSA+ requires dual bipolar supplies (±3V to ±8V) and is not specified for single-supply operation. For single-rail applications, refer to the MAX323/MAX324/MAX325 series, which operate from +3V to +15V and share similar RON and leakage specs but use different internal architecture optimized for unipolar biasing.
What package type and dimensions does MAX321CSA+ use?
The MAX321CSA+ is supplied in an 8-pin SO (Small Outline) package with 1.27mm lead pitch, body size 4.9mm × 3.9mm × 1.45mm, and JEDEC MS-012AC compliance. It is footprint-compatible with other SO-8 analog switches and supports standard reflow soldering profiles. The 'CSA' suffix explicitly denotes this commercial-grade SO-8 variant rated for 0°C to +70°C operation.
MAX321CSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX321CSA+ FAQ
1.How can I place an order for MAX321CSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX321CSA+ 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 MAX321CSA+ reliable?
The price and inventory of MAX321CSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX321CSA+ is usually 5 days.
3.What payment methods are accepted for MAX321CSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX321CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX321CSA+?
MAX321CSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX321CSA+ 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 MAX321CSA+?
For technical support, including MAX321CSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX321CSA+ requirements.
6.How does Aetrix verify that MAX321CSA+ is sourced from the original manufacturer or authorized distributors?
All MAX321CSA+ 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 MAX321CSA+ meets industry standards.
7.What is the process for return or replacement of MAX321CSA+?
All MAX321CSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX321CSA+, 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 MAX321CSA+ part is unused and in its original packaging.
Return procedure for MAX321CSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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