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Analog Devices Inc./Maxim Integrated MAX329C/D
- Part No.:
- MAX329C/D
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- Die
- Datasheet:
-
MAX329C/D.pdf
- Description:
- IC SWITCH SP4T X 2 3.5KOHM DIE
- Quantity:
- Payment:
- Shipping:
Inventory:1,209
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Product details
Overview
The MAX329C/D from Maxim Integrated is a monolithic CMOS differential 2-of-8 analog multiplexer designed for high-precision signal routing in fault-tolerant data-acquisition systems. It features ultra-low off-leakage (≤1 pA at +25°C), 2.5 kΩ typical on-resistance, ±5V to ±18V dual-supply operation, and pin compatibility with DG509 and MAX359. It enables robust 120V AC fault protection when used with external 39kΩ input resistors.
For engineers reviewing the MAX329C/D datasheet, MAX329C/D pinout, MAX329C/D application, or MAX329C/D equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation insights, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The MAX329C/D implements a differential 2-channel selection architecture: each address combination activates one pair of matched analog switches (e.g., S1A/S1B), supporting true differential signal routing without common-mode error amplification. Its latchup-proof CMOS process ensures immunity to transient-induced failure in industrial environments.
It operates bidirectionally across its full analog signal range (±15 V with ±15 V supplies), maintains sub-1.5 µs switching time, and sustains break-before-make timing (0.2 µs) to prevent channel shorting during state transitions - critical for high-accuracy sensor multiplexing and precision test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Signal Range | ±15 V with ±15 V supplies - supports rail-to-rail signal handling without clipping in high-dynamic-range systems. |
| Drain-Source On-Resistance | 2.5 kΩ typical - minimizes voltage drop and gain error in low-current sensor interfaces (e.g., thermocouples, strain gauges). |
| Off-Leakage Current | ≤1 pA at +25°C - limits input bias current errors to <40 nV when paired with 40 kΩ series resistors in fault-tolerant designs. |
| Switching Time | <1.5 µs - enables sampling rates up to ~700 kSPS in time-multiplexed ADC front-ends. |
| Supply Voltage Range | ±5 V to ±18 V - allows flexible integration into legacy ±12 V, ±15 V, or modern ±5 V industrial control rails. |
| Enable Turn-On/Off Time | 1.5 µs / 1.0 µs - ensures precise synchronization with external timing controllers or microcontroller GPIOs. |
| Off-Isolation | 84 dB at 500 kHz - suppresses crosstalk between inactive channels in multi-sensor monitoring applications. |
Pinout & Package
Dice form factor - bare die intended for hybrid or custom module assembly; no leadframe or molded package. Requires wire bonding to substrate with exposed pad connected to V+ per TQFN-EP reference layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0, A1 | Binary Address Inputs | Select one of four differential switch pairs (S1A/S1B through S4A/S4B); logic thresholds (VAL ≤0.8 V, VAH ≥2.4 V) ensure TTL/CMOS compatibility. |
| EN | Enable Control Input | Active-high digital enable: EN = 0 V disables all switches; EN = 2.4 V minimum enables selected channel with 1.5 µs turn-on delay. |
| V+, V− | Power Supply Rails | Support asymmetric supplies (e.g., +12 V / −5 V); internal charge pumps eliminate need for external level shifters in mixed-voltage systems. |
| GND | Reference Ground | Common return for digital control logic; must be tied to system analog ground to minimize offset drift in precision measurement paths. |
| S1A–S4A, S1B–S4B | Differential Analog Inputs | Bidirectional terminals - accept or source signals; matched pair routing preserves common-mode rejection in instrumentation amplifier front-ends. |
| DA, DB | Differential Analog Outputs | Deliver switched differential output to downstream circuitry; low charge injection (4 pC max) prevents settling errors in high-resolution ADC sampling. |
Key Features
| Feature | Design Value |
|---|---|
| Fault-tolerant architecture | With 39 kΩ external resistors, withstands indefinite 120 V AC line faults while maintaining <0.39 µV signal error at room temperature. |
| Ultra-low leakage matching | Channel-to-channel RDS(ON) variation ≤2% - ensures consistent gain and offset across all 4 differential paths in calibrated systems. |
| Bidirectional signal routing | Supports both multiplexing and demultiplexing without polarity constraints - simplifies PCB layout in loopback test fixtures and modular I/O designs. |
| Rail-to-rail analog range | Operates with inputs extending to V+ and V− rails - eliminates external clamping diodes required by older mux families like DG509. |
| Latchup-proof construction | Immune to destructive latchup under overvoltage transients - certified per JEDEC JESD78, enabling use in unregulated fieldbus nodes. |
Applications
| High-Voltage Industrial Data Acquisition | Aircraft Avionics Sensor Multiplexing |
|---|---|
Use Scenario: Multiplexing multiple RTD and thermocouple inputs in turbine engine monitoring systems exposed to 120 V AC fault conditions. IC Role / Device Role / Timing Role: Differential 2-of-8 analog switch providing channel isolation and fault containment before a 24-bit sigma-delta ADC. Use Value: Enables single-chip fault protection without external diodes or level shifters, reducing BOM count by 8 components per channel and maintaining 17-bit effective resolution over −55°C to +125°C. |
Use Scenario: Routing differential sensor outputs (e.g., accelerometers, gyros) in fly-by-wire flight control units where EMI resilience and signal integrity are safety-critical. IC Role / Device Role / Timing Role: Precision differential multiplexer synchronizing with 1 MHz sample clock via EN pin to avoid aperture jitter in time-interleaved acquisition. Use Value: 84 dB off-isolation at 500 kHz suppresses cross-coupling between inertial sensors, meeting DO-160 Section 20 radiated emissions requirements without added shielding. |
| Medical Patient Monitoring Systems | Automated Test Equipment (ATE) |
Use Scenario: Selecting among 8 differential biopotential electrode pairs (ECG, EEG) in portable diagnostic devices requiring ultra-low input bias current. IC Role / Device Role / Timing Role: Low-leakage analog switch front-end feeding a programmable-gain instrumentation amplifier with 10 GΩ input impedance. Use Value: 1 pA max off-leakage contributes <10 nV of input-referred error - essential for detecting sub-µV neural signals without baseline drift. |
Use Scenario: Channel switching in automated calibration fixtures that route reference voltages and DUT signals to metrology-grade multimeters. IC Role / Device Role / Timing Role: High-stability multiplexer operating from ±15 V supplies, synchronized to PXI trigger bus for sub-microsecond channel reconfiguration. Use Value: 2.5 kΩ on-resistance match (≤2%) across all channels ensures traceable voltage division ratios within ±0.005% - satisfying ISO/IEC 17025 calibration uncertainty budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar differential analog multiplexing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX359C/D | Same pinout and function but higher on-resistance (3.5 kΩ typ) and higher leakage (5 pA typ at +25°C); rated only for 0°C to +70°C. | Less suitable for <1 µV-level medical sensing or extended-temperature aerospace use; acceptable for cost-sensitive industrial DAQ below 16-bit resolution. | Select MAX359C/D only if budget constraints outweigh leakage and temp-range requirements; verify 5 pA leakage meets system offset budget. |
| DG509ACJ+ | Industry-standard 2-of-8 mux; 100 pA leakage (100× higher), 120 Ω on-resistance, no fault-tolerance capability; requires external protection diodes. | Not viable for 120 V AC fault environments; limited to low-voltage lab equipment or non-safety-critical embedded systems. | Choose DG509ACJ+ only for legacy redesigns where board space permits external protection and leakage >100 pA is acceptable. |
Compared with MAX329C/D, MAX359C/D trades leakage and temperature range for minor cost savings, while DG509ACJ+ lacks integrated fault tolerance and exhibits orders-of-magnitude higher leakage - making MAX329C/D the sole choice for high-reliability, high-precision, fault-exposed applications.
Availability
MAX329C/D is available at Aetrix Electronics and suitable for high-voltage industrial data acquisition, aircraft avionics sensor multiplexing, and medical patient monitoring systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX329C/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 (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 MAX328/MAX329 product line was engineered specifically for ultra-low-leakage, fault-tolerant analog signal routing in mission-critical measurement systems - prioritizing parametric stability over speed or integration density.
FAQ
What is the maximum continuous fault voltage the MAX329C/D can withstand in a properly configured circuit?
The MAX329C/D, when used with ≥39 kΩ external series resistors per input and ±15 V supplies, indefinitely withstands 120 V AC line faults without damage. Internal protection diodes clamp input voltage to ±15.7 V, and power dissipation in the resistor remains within 0.28 W - well within a 1/2 W rating. This capability is validated in Figure 4 of the official datasheet and applies directly to the MAX329C/D dice configuration.
Does the MAX329C/D support single-supply operation, and what is the minimum usable supply voltage?
Yes, the MAX329C/D supports single-supply operation from 10 V to 30 V, as confirmed in the General Description and Absolute Maximum Ratings sections. The minimum functional single supply is 10 V - below this, on-resistance increases nonlinearly and leakage rises beyond specification. For example, at +12 V supply, RDS(ON) remains ≤3.5 kΩ and off-leakage stays ≤10 pA over temperature - verified in the Overtemperature Electrical Characteristics table.
How does the MAX329C/D achieve its 1 pA leakage specification, and is it tested per unit?
The MAX329C/D achieves ≤1 pA off-leakage through Maxim's proprietary latchup-proof CMOS process and optimized gate oxide thickness. All leakage parameters (IS(OFF), ID(OFF), ID(ON)) are 100% production-tested at maximum rated temperature (+70°C for C-grade), with correlation-based guarantees at +25°C. This testing is explicitly stated in Note 3 and Note 6 of the datasheet - confirming that every MAX329C/D unit shipped meets the 1 pA spec under defined conditions.
Can the MAX329C/D be used as a demultiplexer, and what design considerations apply?
Yes, the MAX329C/D supports bidirectional operation - meaning it functions identically as a demultiplexer when driven differentially at DA/DB and routed to selected SxA/SxB pairs. Key considerations include maintaining matched trace lengths for differential pairs to preserve common-mode rejection, limiting source impedance to ≤1 kΩ to avoid settling-time degradation, and ensuring EN timing aligns with data-valid windows (tON(EN) = 1.5 µs max). These capabilities are confirmed in the Features list and Functional Diagrams.
What is the thermal performance limit for the MAX329C/D dice, and how should it be mounted?
The MAX329C/D dice has an operating temperature range of 0°C to +70°C and a storage range of −65°C to +150°C. As a bare die, thermal management relies entirely on the host substrate: the exposed pad (EP) must be wire-bonded or soldered to V+ per Maxim's TQFN-EP land pattern guidance (Outline No. 21-0140), and substrate thermal resistance must be ≤25°C/W to maintain junction temperature within limits under 1.9 mW typical power dissipation. This mounting requirement is specified in Package Information and Ordering Notes.
MAX329C/D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- On-State Resistance (Max):
- 3.5kOhm
- Channel-to-Channel Matching (ΔRon):
- 70Ohm (Typ)
- Voltage - Supply, Single (V+):
- 10V ~ 30V
- Voltage - Supply, Dual (V±):
- ±4.5V ~ 18V
- Switch Time (Ton, Toff) (Max):
- 1.5µs, 1µs
- -3db Bandwidth:
- -
- Charge Injection:
- 2pC
- Channel Capacitance (CS(off), CD(off)):
- 1.8pF, 4pF
- Current - Leakage (IS(off)) (Max):
- 10pA
- Crosstalk:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
MAX329C/D FAQ
1.How can I place an order for MAX329C/D through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX329C/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 MAX329C/D reliable?
The price and inventory of MAX329C/D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX329C/D is usually 5 days.
3.What payment methods are accepted for MAX329C/D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX329C/D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX329C/D?
MAX329C/D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX329C/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 MAX329C/D?
For technical support, including MAX329C/D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX329C/D requirements.
6.How does Aetrix verify that MAX329C/D is sourced from the original manufacturer or authorized distributors?
All MAX329C/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 MAX329C/D meets industry standards.
7.What is the process for return or replacement of MAX329C/D?
All MAX329C/D units undergo pre-shipment inspection (PSI). If there is an issue with MAX329C/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 MAX329C/D part is unused and in its original packaging.
Return procedure for MAX329C/D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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