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Analog Devices Inc./Maxim Integrated MAX321ESA+
- Part No.:
- MAX321ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX321ESA+.pdf
- Description:
- IC SWITCH SPST-NCX2 35OHM 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:215
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Product details
Overview
MAX321ESA+ from Maxim Integrated is a precision dual-channel, normally closed (NC) analog switch designed for bipolar ±3V to ±8V operation in signal routing applications. It delivers 35Ω max on-resistance, <2Ω channel-to-channel RON matching, and <100ns turn-off time, enabling high-fidelity switching in ±5V DAC/ADC interfaces and battery-powered test equipment.
For engineers reviewing the MAX321ESA+ datasheet, MAX321ESA+ pinout, MAX321ESA+ application, or MAX321ESA+ equivalent, key selection criteria include guaranteed NC configuration, low 100pA leakage at +85°C, 5pC max charge injection, and SO-8 package compatibility with industrial temperature range (-40°C to +85°C).
Technical Context
The MAX321ESA+ implements complementary MOSFET pairs per channel with matched threshold voltages to achieve <2Ω RON matching and <4Ω RON flatness across ±3V to ±8V supplies. Its logic interface accepts TTL/CMOS-compatible inputs referenced to V+, with VIH = V+ − 1.5V and VIL = V+ − 2.5V.
All channels are bidirectional and support analog signals spanning the full supply range (V− to V+). Internal ESD protection exceeds 2000V per Method 3015.7, and the device guarantees break-before-make timing only in the MAX322 variant-not applicable to MAX321ESA+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | ±3V to ±8V dual supply - supports rail-to-rail analog signal switching without level-shifting. |
| On-Resistance (RON) | 35Ω max at ±5V - ensures minimal signal attenuation and gain error in precision instrumentation paths. |
| RON Matching | <2Ω between channels - critical for matched gain/phase in differential or dual-path signal conditioning. |
| Charge Injection | 5pC max - limits voltage glitch on sample-and-hold capacitors, preserving ADC accuracy. |
| Leakage Current | 100pA max at +25°C; <2.5nA at +85°C - maintains integrity of high-impedance sensor or bias networks. |
| Switching Speed | tON <150ns, tOFF <100ns - enables use in multiplexed data acquisition up to ~5MHz effective throughput. |
| ESD Protection | >2000V per Method 3015.7 - provides robust handling during board assembly and field service. |
Pinout & Package
MAX321ESA+ is housed in an 8-pin SO (Small Outline) package compliant with JEDEC MS-012, measuring 4.9mm × 6.0mm × 1.75mm, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NO1 | Normally open terminal of Channel 1 - unconnected when IN1 = logic low; connects to COM1 when IN1 = logic high. |
| 2 | COM1 | Common analog node for Channel 1 - bidirectional path between NO1 and NC1. |
| 3 | IN2 | Logic input for Channel 2 - active-high control; drives internal gate bias to close NC2 path. |
| 4 | V− | Negative power supply rail - must be stable and low-noise; referenced for all analog and logic thresholds. |
| 5 | V+ | Positive power supply rail - sets logic high level (VIH ≈ V+ − 1.5V) and defines upper analog signal limit. |
| 6 | COM2 | Common analog node for Channel 2 - bidirectional path between NO2 and NC2. |
| 7 | IN1 | Logic input for Channel 1 - active-high control; closes NC1 path when asserted. |
| 8 | NC1 | Normally closed terminal of Channel 1 - connected to COM1 when IN1 = logic low; opens when IN1 = logic high. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar supply operation | Operates from ±3V to ±8V - eliminates need for level shifters in legacy ±5V systems and mixed-signal test gear. |
| Guaranteed NC configuration | Two independent normally closed switches - ensures default signal continuity during power-up or logic fault conditions. |
| Low charge injection (≤5pC) | Minimizes sampling error in precision S/H circuits and reduces settling time in switched-capacitor filters. |
| High off-isolation (72dB) | Suppresses crosstalk between channels at 1MHz - essential for multi-channel audio routing and RF front-end switching. |
| Low power dissipation (≤1.25mW) | Enables integration into portable medical monitors and handheld test instruments without thermal derating. |
Applications
| Battery-Powered Test Equipment | ±5V Data Acquisition Systems |
|---|---|
|
Use Scenario: Portable multimeter front-end multiplexing of voltage, current, and resistance measurement paths. IC Role / Device Role / Timing Role: Dual NC analog switch routing sensor signals to shared ADC while maintaining default connectivity during sleep mode. Use Value: Ensures no signal path interruption at power-on; 100pA leakage preserves microamp-level current measurement accuracy. |
Use Scenario: Channel selection in industrial PLC analog input modules interfacing ±5V sensors and transmitters. IC Role / Device Role / Timing Role: Precision SPST switch isolating individual RTD or thermocouple inputs before programmable gain amplifier stage. Use Value: 35Ω RON and <2Ω matching minimize channel-to-channel gain mismatch across 16-bit ADC conversions. |
| Audio Signal Routing | Military Radio Front-Ends |
|
Use Scenario: Input source selection in professional audio mixers supporting balanced line-level signals. IC Role / Device Role / Timing Role: Bidirectional NC switch passing ±3V audio waveforms with minimal distortion and crosstalk. Use Value: 72dB off-isolation and 9pF off-capacitance prevent audible inter-channel bleed at 20kHz bandwidth. |
Use Scenario: Antenna and filter bank switching in manpack tactical radios operating across HF/VHF bands. IC Role / Device Role / Timing Role: High-reliability analog switch enabling rapid reconfiguration of receive/transmit signal paths under EMI stress. Use Value: 2000V ESD rating and -40°C to +85°C SO-8 package ensure survivability in ruggedized enclosures and field deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1411BRZ | Single-supply only (up to ±15V), 1.8Ω typical RON, but requires external level translation for ±5V logic control. | Preferred in new designs using 3.3V/5V logic rails and single-ended supplies; not drop-in for existing ±5V control architectures. | Select ADG1411BRZ when upgrading to lower RON and higher voltage tolerance, and when redesigning logic interface. |
| TS5A23157DCKR | Single-supply (1.65V–5.5V), 0.9Ω typical RON, but lacks bipolar supply capability and fails at V− < 0V. | Suitable only for low-voltage consumer audio or USB-powered instrumentation; cannot replace MAX321ESA+ in any ±V system. | Choose TS5A23157DCKR for cost-sensitive, battery-operated 3.3V systems where bipolar operation is unnecessary. |
Compared with ADG1411BRZ and TS5A23157DCKR, the MAX321ESA+ uniquely supports direct ±5V logic control and rail-to-rail analog switching without external level shifters-making it irreplaceable in legacy military, industrial, and test equipment where supply architecture is fixed.
Availability
MAX321ESA+ is available at Aetrix Electronics and suitable for battery-operated test equipment, ±5V data acquisition systems, and military radio front-ends requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX321ESA+ 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) is a fabless semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX320/MAX321/MAX322 family was engineered specifically for precision analog signal routing in bipolar-supply environments-targeting applications demanding low leakage, low distortion, and guaranteed fail-safe (NC) behavior during power transitions.
FAQ
What is the logic polarity of MAX321ESA+?
The MAX321ESA+ uses active-high logic control: applying logic high (≥V+ − 1.5V) to IN1 or IN2 opens the respective NC switch, disconnecting COM from NC. Logic low (≤V+ − 2.5V) maintains the NC path. This behavior is confirmed in the truth table and functional diagrams of the MAX321ESA+ datasheet, and applies identically across all temperature ranges and supply voltages within specification.
Does MAX321ESA+ support rail-to-rail analog signal switching?
Yes, MAX321ESA+ supports analog signals from V− to V+ without clipping or increased distortion. The device's CMOS topology and matched P/N channel design maintain <4Ω RON flatness over the full ±3V to ±8V supply range, as verified in the "On-Resistance vs. Voltage at COM Pin" curves. This enables direct connection to ±5V DAC outputs and ADC inputs without external clamping or level shifting.
What is the maximum allowable supply voltage difference for MAX321ESA+?
The absolute maximum rating for MAX321ESA+ specifies that the total supply voltage (V+ − V−) must not exceed 17V. For example, ±8V operation (16V total) is permitted, but ±8.5V (17V) is the hard limit. Exceeding this risks permanent damage, as stated in the Absolute Maximum Ratings table. This constraint applies regardless of temperature or load condition.
Can MAX321ESA+ be used in place of MAX321EPA?
Yes, MAX321ESA+ is a direct functional and pin-compatible replacement for MAX321EPA, differing only in package: SO-8 versus plastic DIP. Both share identical electrical specifications, temperature range (−40°C to +85°C), and pinout. The SO-8 package offers superior thermal performance and board-space efficiency, making MAX321ESA+ preferred for modern high-density PCB layouts while maintaining full interchangeability.
Is break-before-make timing guaranteed for MAX321ESA+?
No, break-before-make timing is guaranteed only for the MAX322 variant, as explicitly noted in the Features section and Figure 3 of the MAX321ESA+ datasheet. The MAX321ESA+ implements simple NC switching with no intentional delay between channel opening and closing - meaning momentary shorting may occur during logic transitions. Designers requiring break-before-make must select MAX322ESA+ instead.
MAX321ESA+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX321ESA+ FAQ
1.How can I place an order for MAX321ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX321ESA+ 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 MAX321ESA+ reliable?
The price and inventory of MAX321ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX321ESA+ is usually 5 days.
3.What payment methods are accepted for MAX321ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX321ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX321ESA+?
MAX321ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX321ESA+ 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 MAX321ESA+?
For technical support, including MAX321ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX321ESA+ requirements.
6.How does Aetrix verify that MAX321ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX321ESA+ 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 MAX321ESA+ meets industry standards.
7.What is the process for return or replacement of MAX321ESA+?
All MAX321ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX321ESA+, 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 MAX321ESA+ part is unused and in its original packaging.
Return procedure for MAX321ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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