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Analog Devices Inc./Maxim Integrated MAX494CPD+
- Part No.:
- MAX494CPD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX494CPD+.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,865
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Product details
Overview
MAX494CPD+ from Maxim Integrated is a quad micropower operational amplifier with rail-to-rail input and output swing, operating from +2.7V to +6V single supply or ±1.35V to ±3V dual supplies. It delivers 500kHz gain-bandwidth, 200µV max input offset voltage, 150µA max quiescent current per amplifier, and drives 1kΩ loads - ideal for low-voltage signal conditioning in portable instrumentation.
For engineers reviewing the MAX494CPD+ datasheet, MAX494CPD+ pinout, MAX494CPD+ application, or MAX494CPD+ equivalent, key selection criteria include rail-to-rail common-mode range (VEE to VCC), output swing within 50mV of rails (RL = 100kΩ), unity-gain stability, no phase reversal on overdrive, and capacitive-load drive capability beyond 1nF.
Technical Context
The MAX494CPD+ employs complementary NPN/PNP input stages enabling rail-to-rail common-mode input voltage (VEE to VCC) without phase reversal, with a widened 600mV transition region to minimize CMRR degradation. Its folded-cascode output stage supports rail-to-rail output swing while maintaining DC accuracy under load.
Each of the four amplifiers operates independently with <150µA supply current, 25nV/√Hz input voltage noise, and stable operation driving ≥1nF capacitive loads - enabled by internal compensation optimized for unity-gain configurations and low-current biasing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +6V single supply; enables direct interface with Li-ion, 3.3V, and 5V systems without level-shifting. |
| Input Common-Mode Range | VEE to VCC - allows sensing signals at supply rails (e.g., battery voltage monitoring at ground or VCC). |
| Output Voltage Swing | Within 50mV of VEE/VCC (RL = 100kΩ) - maximizes dynamic range in low-voltage ADC front-ends. |
| Quiescent Current | 150µA per amplifier - supports multi-channel always-on sensing with sub-600µA total quiescent draw. |
| Gain-Bandwidth Product | 500kHz - sufficient for anti-aliasing filtering, sensor buffering, and DC-coupled data acquisition up to ~50kHz. |
| Input Offset Voltage | 200µV (max, +25°C) - contributes <0.5 LSB error when driving a 12-bit ADC with 4.096V reference. |
| CMRR / PSRR | 90dB / 110dB - rejects supply ripple and common-mode interference in noisy embedded environments. |
Pinout & Package
MAX494CPD+ is housed in a 14-pin plastic DIP package (0.300" wide), pin-compatible with industry-standard quad op-amp footprints. Pin assignments follow conventional dual-in-line layout with independent power, input, and output terminals per channel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | OUT1, OUT2, OUT3, OUT4 | Amplifier outputs - each capable of rail-to-rail sourcing/sinking into ≥1kΩ loads. |
| 2, 6, 10, 14 | IN1−, IN2−, IN3−, IN4− | Inverting inputs - protected by back-to-back diodes limiting differential input to ±0.7V. |
| 3, 7, 11, 12 | IN1+, IN2+, IN3+, IN4+ | Noninverting inputs - accept common-mode voltages from VEE to VCC without phase reversal. |
| 4 | VEE | Negative supply pin - connects to ground (single supply) or negative rail (dual supply); substrate tied to VEE. |
| 8 | VCC | Positive supply pin - bypass with 1µF || 0.1µF ceramic capacitor for stable low-noise operation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.25V beyond VEE and VCC - eliminates need for input biasing resistors in single-supply sensor interfaces. |
| No phase reversal on overdrive | Guaranteed operation without latch-up or inversion when inputs exceed supply rails - critical for fault-tolerant industrial signal chains. |
| Capacitive-load drive >1nF | Stable with ≥1000pF pure capacitive load (RL = ∞) - enables direct connection to ADC sample capacitors or long PCB traces. |
| Low input offset voltage tempco | ±2µV/°C - ensures <1.5mV drift over −40°C to +85°C, preserving accuracy in unregulated temperature environments. |
| Unity-gain stable architecture | Operates reliably as voltage follower without external compensation - simplifies design of high-impedance buffer stages. |
Applications
| Portable Equipment | Battery-Powered Instruments |
|---|---|
|
Use Scenario: Signal conditioning for thermistor, RTD, or MEMS sensor outputs in handheld multimeters and environmental monitors. IC Role / Device Role / Timing Role: Quad buffer amplifier providing rail-to-rail DC coupling, gain setting, and drive capability for 12-bit SAR ADCs. Use Value: 200µV offset and 90dB CMRR ensure <0.5 LSB measurement error; 150µA per amp extends battery life beyond 1 year in sleep-wake cycles. |
Use Scenario: Front-end amplification for pH, dissolved oxygen, or conductivity sensors in field-deployable water quality analyzers. IC Role / Device Role / Timing Role: Low-power transducer interface with programmable gain and offset correction via external potentiometers. Use Value: Rail-to-rail input accepts sensor outputs near ground or VCC; 25nV/√Hz noise preserves resolution in µV-level electrochemical measurements. |
| Data Acquisition | Low-Voltage Applications |
|
Use Scenario: Multi-channel analog input module for PLCs and industrial controllers sampling 4–20mA loops and thermocouples. IC Role / Device Role / Timing Role: Quad precision buffer isolating field-side signals from ADC inputs while rejecting common-mode noise on long cables. Use Value: 110dB PSRR suppresses switching regulator ripple; 4-channel integration reduces board space vs. discrete solutions by 60%. |
Use Scenario: Power management feedback loop in ultra-low-power IoT nodes using coin-cell batteries (1.8–3.0V). IC Role / Device Role / Timing Role: Comparator input stage and reference buffer for buck converter control ICs operating below 2.7V. Use Value: Operates down to +2.7V supply with full rail-to-rail functionality - avoids brown-out shutdown during battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Higher quiescent current (550µA per amp), wider supply range (2.7V–6V), but only 600kHz GBW and no guaranteed phase-reversal immunity. | Less suitable for battery life–critical designs; requires external protection for overvoltage inputs. | Prefer where higher speed or rail-to-rail output alone suffices, and power budget allows >2× current draw. |
| AD8604ARUZ | Lower offset (60µV max), lower noise (12nV/√Hz), but 1mA quiescent current and limited capacitive-load drive (<100pF). | Better for precision metrology, but incompatible with high-C ADC inputs or multi-day battery operation. | Select when offset and noise dominate requirements, and system can support active power management. |
Compared with TLV2464IDR and AD8604ARUZ, MAX494CPD+ uniquely balances micropower operation (150µA), robust rail-to-rail I/O, phase-reversal immunity, and >1nF capacitive-load stability - making it irreplaceable in compact, battery-powered data loggers requiring long-term DC accuracy without layout compromises.
Availability
MAX494CPD+ is available at Aetrix Electronics and suitable for portable equipment, battery-powered instruments, and low-voltage data acquisition systems requiring stable component supply across extended product lifecycles.
Supply support for MAX494CPD+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, and communications markets.
The MAX492/MAX494/MAX495 family was engineered for ultra-low-power, rail-to-rail signal conditioning in space- and energy-constrained systems - targeting portable medical devices, handheld test equipment, and remote sensor nodes.
FAQ
Is MAX494CPD+ recommended for new designs?
No - MAX494CPD+ is Not Recommended for New Designs per Maxim's official documentation. The wafer process used is obsolete, and Maxim does not guarantee long-term availability. For new projects, consult Analog Devices' replacement recommendations or second-source alternatives with verified pin-and-function compatibility. Existing designs may continue using MAX494CPD+ with appropriate lifecycle risk assessment.
What is the maximum capacitive load MAX494CPD+ can drive stably?
MAX494CPD+ is characterized to drive ≥1000pF pure capacitive loads with RL = ∞ while maintaining stability (Figure 6). With resistive loading (e.g., RL ≥ 5kΩ), it remains stable up to 500pF (Figures 7a–7c). For >1nF loads, adding a 47Ω series isolation resistor at the output (Figure 8) extends stable operation to 10,000pF - confirmed in typical operating characteristics.
Does MAX494CPD+ support offset voltage trimming?
No - unlike the single MAX495 (which has NULL pins 1 and 5), the quad MAX494CPD+ does not provide external offset null capability. Its input offset voltage is factory-trimmed to ≤200µV at +25°C, with ±2µV/°C tempco. System-level calibration or digital post-processing is required for tighter DC accuracy.
What is the common-mode input voltage range for MAX494CPD+?
MAX494CPD+ supports a true rail-to-rail common-mode input range from VEE to VCC - explicitly specified as (VEE − 0.25V) to (VCC + 0.25V) at +25°C (DC Electrical Characteristics table). This allows direct interfacing with signals referenced to ground or supply rails without level-shifting networks.
Can MAX494CPD+ operate from split supplies?
Yes - MAX494CPD+ operates from dual supplies ranging from ±1.35V to ±3V. The absolute maximum supply voltage is 7V (VCC − VEE), and all electrical specifications (including rail-to-rail I/O) apply across this dual-supply range. Layout must include individual 1µF || 0.1µF bypassing on both VCC and VEE pins.
MAX494CPD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.2V/µs
- Gain Bandwidth Product:
- 500 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 25 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
MAX494CPD+ FAQ
1.How can I place an order for MAX494CPD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX494CPD+ 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 MAX494CPD+ reliable?
The price and inventory of MAX494CPD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX494CPD+ is usually 5 days.
3.What payment methods are accepted for MAX494CPD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX494CPD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX494CPD+?
MAX494CPD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX494CPD+ 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 MAX494CPD+?
For technical support, including MAX494CPD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX494CPD+ requirements.
6.How does Aetrix verify that MAX494CPD+ is sourced from the original manufacturer or authorized distributors?
All MAX494CPD+ 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 MAX494CPD+ meets industry standards.
7.What is the process for return or replacement of MAX494CPD+?
All MAX494CPD+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX494CPD+, 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 MAX494CPD+ part is unused and in its original packaging.
Return procedure for MAX494CPD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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