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Analog Devices Inc./Maxim Integrated MAX4521CSE+
- Part No.:
- MAX4521CSE+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4521CSE+.pdf
- Description:
- IC SW SPST-NCX4 100OHM 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,390
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Product details
Overview
MAX4521CSE+ from Maxim Integrated is a quad, low-voltage, normally closed (NC) SPST analog switch IC designed for precision signal routing in rail-to-rail analog paths. It features 100Ω max on-resistance, 4Ω max channel-to-channel on-resistance matching, and <1µW power consumption. Each switch supports ±2V to ±6V dual supplies or +2V to +12V single supply, with TTL/CMOS-compatible logic inputs - ideal for battery-powered data acquisition systems.
For engineers reviewing the MAX4521CSE+ datasheet, MAX4521CSE+ pinout, MAX4521CSE+ application, or MAX4521CSE+ equivalent, key selection criteria include on-resistance flatness (12Ω max), off-leakage current (1nA at +25°C), rail-to-rail signal handling, ESD robustness (>2kV per Method 3015.7), and pin compatibility with DG211/DG212/DG213.
Technical Context
The MAX4521CSE+ implements four independent CMOS SPST switches with NC configuration, driven by logic-level translators that convert TTL/CMOS inputs into complementary V+ and V− gate signals. Its analog path uses paralleled N- and P-channel MOSFETs to enable bidirectional rail-to-rail signal conduction without ground reference.
Internal reverse-biased ESD diodes connect each analog pin to V+ and V−, defining absolute signal limits and contributing to leakage current. The device achieves low charge injection (1–5pC) and high off-isolation (<−90dB at 100kHz), making it suitable for low-distortion, low-noise switching in sensitive analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 100Ω max at ±5V supplies - ensures minimal signal attenuation and voltage drop in precision analog paths. |
| On-resistance match (ΔRON) | 4Ω max between channels - enables matched gain/attenuation across multiplexed sensor or audio channels. |
| On-resistance flatness (RFLAT) | 12Ω max over signal range - maintains consistent impedance across full analog input swing, reducing harmonic distortion. |
| Off-leakage current | 1nA at +25°C - preserves signal integrity in high-impedance circuits like sensor interfaces and sample-and-hold stages. |
| Supply range | +2V to +12V single or ±2V to ±6V dual - supports operation from low-voltage battery rails up to industrial supply levels. |
| Logic thresholds | +0.8V low / +2.4V high - guarantees reliable TTL/CMOS compatibility without level-shifting when using +5V supply. |
| ESD protection | >2kV per Method 3015.7 - provides robust handling during board assembly and field deployment in portable equipment. |
Pinout & Package
MAX4521CSE+ is housed in a 16-pin narrow SO (SOIC-N) package (S16-2), 3.9mm × 9.9mm body, 1.27mm pitch, with gull-wing leads and no exposed pad.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 9, 12 | NC1–NC4 | Normally closed analog terminals - conduct to COMx when INx = logic low; used as primary signal outputs in NC topology. |
| 2, 15, 10, 7 | COM1–COM4 | Common analog terminals - bidirectional signal path shared between NCx and internal switch; no ground reference required. |
| 3, 6, 14, 11 | IN1–IN4 | Digital control inputs - TTL/CMOS-compatible; active-low logic controls NC closure (IN = 0 → ON). |
| 5 | GND | Digital ground reference - powers internal logic and level translators; isolated from analog signal paths. |
| 8 | V− | Negative analog supply - sets lower bound of rail-to-rail analog range; tied to GND for single-supply operation. |
| 13 | V+ | Positive analog/digital supply - powers analog switches and logic; internally connected to substrate. |
| 16 | N.C. | No connection - not internally bonded; must be left floating or grounded per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog signal handling | Supports signals from V− to V+ without clipping - enables direct interfacing with op-amps, ADCs, and DACs operating at supply rails. |
| Low on-resistance flatness (12Ω max) | Minimizes THD and amplitude error across full input range - critical for audio routing and precision instrumentation. |
| 4Ω max on-resistance matching | Ensures uniform channel gain in multi-channel multiplexers - essential for differential signal switching and calibration accuracy. |
| Pin compatibility with DG211/DG212/DG213 | Enables drop-in replacement in legacy designs without PCB redesign - reduces qualification time and BOM rationalization effort. |
| <1µW quiescent power | Extends battery life in portable test equipment and remote sensors - negligible impact on system standby current. |
Applications
| Battery-Powered Data Acquisition | Avionics Signal Routing |
|---|---|
|
Use Scenario: Multiplexing low-level thermocouple or strain gauge signals in handheld DMMs or portable loggers. IC Role / Device Role / Timing Role: Quad NC switch routes analog inputs to a single ADC channel under microcontroller control. Use Value: 1nA off-leakage prevents DC offset errors; rail-to-rail support accommodates wide-swing sensor outputs without external biasing. |
Use Scenario: Selecting between redundant flight control sensors (e.g., airspeed, angle-of-attack) in certified avionics units. IC Role / Device Role / Timing Role: Fault-tolerant analog switch providing fail-safe signal path selection with deterministic NC default state. Use Value: Guaranteed NC behavior on power loss ensures safe default signal routing; >2kV ESD withstand meets DO-160 Section 22 requirements. |
| Audio Signal Switching | Test Equipment Channel Selection |
|
Use Scenario: Routing line-level stereo signals in professional audio mixers or studio interface boxes. IC Role / Device Role / Timing Role: Low-distortion SPST switch enabling mute, monitor, or source selection functions. Use Value: 1–5pC charge injection prevents audible pop/click artifacts; <−90dB off-isolation suppresses crosstalk between adjacent audio channels. |
Use Scenario: Configuring signal paths in automated test equipment (ATE) for semiconductor parametric testing. IC Role / Device Role / Timing Role: Precision analog switch matrix connecting DUT pins to SMUs, digitizers, or sources. Use Value: 100Ω RON and 4Ω matching ensure measurement repeatability; 12Ω flatness preserves waveform fidelity up to 50MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX4522CSE+ | Quad NO (normally open) configuration vs. MAX4521CSE+'s NC - opposite logic polarity and default state. | Suitable where power-on open-circuit safety is required (e.g., relay driver isolation), not NC fail-safe routing. | Select MAX4522CSE+ only if default-open behavior aligns with system fault strategy; pinout and specs otherwise identical. |
| ADG1411BRUZ | Higher on-resistance (1.8Ω typical), wider supply (±15V), but higher leakage (20nA @ +85°C) and no DG211 pin compatibility. | Better for high-voltage industrial I/O modules; less suitable for low-leakage battery-powered DAQ due to thermal drift. | Choose ADG1411BRUZ when ±15V operation or lower RON is critical; avoid when pin compatibility or sub-10nA leakage at temperature is mandatory. |
Compared with MAX4522CSE+, MAX4521CSE+ provides fail-safe NC default routing essential for sensor redundancy; versus ADG1411BRUZ, it delivers superior leakage performance and legacy footprint support at the cost of voltage range - making it optimal for portable, safety-critical analog multiplexing.
Availability
MAX4521CSE+ is available at Aetrix Electronics and suitable for battery-operated equipment, data acquisition systems, and avionics signal routing requiring stable component supply and long-term obsolescence management.
Supply support for MAX4521CSE+ 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, automotive, and communications markets.
The MAX4521/MAX4522/MAX4523 family was designed specifically for low-voltage, low-leakage, rail-to-rail analog switching in space-constrained, power-sensitive applications - emphasizing precision, reliability, and pin compatibility with industry-standard predecessors.
FAQ
What is the default switch state of MAX4521CSE+?
The MAX4521CSE+ features four normally closed (NC) SPST switches. When all IN1–IN4 inputs are at logic low (≤0.8V), the corresponding NC1–NC4 terminals are conductive to their COMx pins. This fail-safe NC behavior ensures signal continuity during power-up, reset, or controller failure - a critical feature in safety-critical analog routing such as avionics sensor selection. The MAX4521CSE+ remains in this state until actively disabled by a logic-high control signal.
Can MAX4521CSE+ operate from a single +3.3V supply?
Yes, MAX4521CSE+ is fully specified for single +2.7V to +3.6V operation. At +3.3V, its on-resistance is 260Ω max (typical 125Ω), logic thresholds remain at +0.8V/+2.4V, and turn-on/turn-off times are 120ns/40ns max. This makes MAX4521CSE+ compatible with modern low-voltage microcontrollers and FPGAs without level shifters - ideal for portable medical devices and IoT sensor nodes where supply headroom is constrained.
How does MAX4521CSE+ handle analog signals exceeding the supply rails?
MAX4521CSE+ includes internal ESD-protection diodes from each analog pin (NCx, COMx) to V+ and V−. If an analog signal exceeds V+ or falls below V−, the corresponding diode conducts, clamping the voltage. To prevent damage, forward diode current must be limited to ±10mA continuous or ±20mA pulsed (1ms, 10% duty). This clamping behavior defines the absolute maximum analog range and requires external current limiting (e.g., series resistors) when overvoltage transients are expected - a key design consideration in industrial sensor interfaces.
Is MAX4521CSE+ pin-compatible with DG211?
Yes, MAX4521CSE+ is explicitly documented as pin-compatible with the industry-standard DG211. Both devices share identical 16-pin SOIC-N pinouts, NC switch configuration, and functional mapping - including COM/NC/IN assignments and V+/V−/GND locations. This allows direct replacement in existing DG211-based designs without PCB modification, preserving layout integrity while upgrading to lower leakage (1nA vs. 10nA), flatter on-resistance, and enhanced ESD tolerance (>2kV vs. 2kV).
What is the maximum frequency for acceptable signal integrity with MAX4521CSE+?
MAX4521CSE+ maintains usable signal integrity up to 50MHz in 50Ω systems, with insertion loss <−1dB and phase deviation <±5°. Above 20MHz, minor on-response peaks may appear depending on PCB layout. Off-isolation degrades at ~20dB/decade - −52dB at 10MHz, falling to −32dB at 100MHz - so high-frequency blocking requires additional filtering. For RF or high-speed digital applications, MAX4521CSE+ is best suited for baseband and audio-frequency routing, not GHz-range signal switching.
MAX4521CSE+ 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:
- 4
- On-State Resistance (Max):
- 100Ohm
- Channel-to-Channel Matching (ΔRon):
- 1Ohm
- Voltage - Supply, Single (V+):
- 2V ~ 12V
- Voltage - Supply, Dual (V±):
- ±2V ~ 6V
- Switch Time (Ton, Toff) (Max):
- 80ns, 30ns
- -3db Bandwidth:
- -
- Charge Injection:
- 1pC
- Channel Capacitance (CS(off), CD(off)):
- 2pF, 2pF
- Current - Leakage (IS(off)) (Max):
- 1nA
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
MAX4521CSE+ FAQ
1.How can I place an order for MAX4521CSE+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4521CSE+ 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 MAX4521CSE+ reliable?
The price and inventory of MAX4521CSE+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4521CSE+ is usually 5 days.
3.What payment methods are accepted for MAX4521CSE+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4521CSE+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4521CSE+?
MAX4521CSE+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4521CSE+ 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 MAX4521CSE+?
For technical support, including MAX4521CSE+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4521CSE+ requirements.
6.How does Aetrix verify that MAX4521CSE+ is sourced from the original manufacturer or authorized distributors?
All MAX4521CSE+ 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 MAX4521CSE+ meets industry standards.
7.What is the process for return or replacement of MAX4521CSE+?
All MAX4521CSE+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4521CSE+, 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 MAX4521CSE+ part is unused and in its original packaging.
Return procedure for MAX4521CSE+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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