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Analog Devices Inc./Maxim Integrated MAX478CPA
- Part No.:
- MAX478CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX478CPA.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,571
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Product details
Overview
MAX478CPA from Maxim Integrated is a dual-channel, single-supply precision operational amplifier in 8-pin plastic DIP package, featuring 17 µA max supply current per amplifier, 70 µV max input offset voltage (at +25°C), and rail-to-rail output swing to within 9 mV of ground at 0°C to +70°C. It operates from 2.2 V to ±22 V supplies and is designed for micropower sensor signal conditioning in battery-powered instrumentation.
For engineers reviewing the MAX478CPA datasheet, MAX478CPA pinout, MAX478CPA application, or MAX478CPA equivalent, key selection criteria include ultra-low quiescent current, ground-sensing input range, guaranteed 5V/3V operation, and compatibility with high-impedance transducer interfaces requiring <100 µV offset stability.
Technical Context
The MAX478CPA integrates two independent precision op amps on a single die optimized for single-supply operation: inputs accept common-mode voltages down to ground, and outputs sink current to within 9 mV of ground without pull-down resistors. Its architecture delivers 70 µV max VOS and 2.2 µV/°C max drift over 0°C to +70°C.
It supports dual supply (±15 V) and single supply (3 V or 5 V) configurations with guaranteed performance across both - including 60 kHz gain-bandwidth product at 5 V, 130 dB channel separation, and 93 dB CMRR at 0–3.5 V common-mode range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current per Amplifier | 14–21 µA at 5 V, 0 V - enables multi-year battery life in remote sensor nodes |
| Input Offset Voltage | 50–170 µV (0°C to +70°C) - ensures <100 µV system-level DC error in thermocouple amplifiers |
| Output Low Voltage | 8–11 mV at no load (0°C to +70°C) - eliminates need for external ground-referenced pull-downs |
| Input Common-Mode Range | 0 V to 3.5 V at 5 V supply - accepts signals directly from grounded sensors or resistive bridges |
| Gain-Bandwidth Product | 60 kHz at 5 V - sufficient for anti-aliasing and low-frequency sensor filtering up to ~10 kHz |
| Input Bias Current | 3–6 nA - preserves signal integrity with >100 MΩ source impedances (e.g., pH electrodes) |
| CMRR | 90–101 dB (0–3.4 V VCM) - rejects power-supply ripple and shared-ground noise in portable systems |
Pinout & Package
MAX478CPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch body width and 0.1-inch lead pitch. Pin 1 is marked by a notch or dot; leads are tin-lead plated, RoHS-compliant per Maxim's legacy process.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Amplifier A output | Drives load directly; sinks to 8 mV above ground at 0°C to +70°C |
| 2 (INA−) | Inverting input, Amp A | High-impedance node (12 GΩ common-mode); accepts differential feedback networks |
| 3 (INA+) | Non-inverting input, Amp A | Ground-referenced input capability enables single-supply transducer interfacing |
| 4 (V−) | Negative supply rail | Connected to ground in single-supply mode; supports dual-supply operation down to −22 V |
| 5 (INB+) | Non-inverting input, Amp B | Independent channel; identical specs to INA+, enabling dual-sensor front-end |
| 6 (INB−) | Inverting input, Amp B | Matches INA− performance; supports matched gain-setting resistor networks |
| 7 (OUTB) | Amplifier B output | Electrically isolated from OUTA; 130 dB channel separation prevents crosstalk |
| 8 (V+) | Positive supply rail | Accepts 2.2 V to +22 V; stable operation confirmed at 3 V and 5 V |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 17 µA max per amplifier - extends shelf life and runtime in coin-cell–powered devices |
| Ground-sensing input | Input common-mode includes 0 V - eliminates level-shifting circuitry for grounded sensors |
| Rail-to-rail output sink | Output swings to 8 mV above ground while sinking 100 µA - removes need for pull-down resistors |
| Low input offset drift | 0.5–2.2 µV/°C (max) - maintains calibration stability across industrial temperature ranges |
| High input impedance | 0.8–2.0 GΩ differential resistance - minimizes loading error on high-Z sources like piezoelectric sensors |
| Single/dual supply flexibility | Specified from 2.2 V single supply to ±15 V - simplifies design reuse across power architectures |
Applications
| Portable Instrumentation | Remote Sensor Amplifier |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or RTD signals under 5 V battery power. IC Role / Device Role / Timing Role: Precision dual op amp providing low-noise, low-drift gain and buffer stages before ADC sampling. Use Value: 70 µV max VOS and 2.2 µV/°C drift ensure <0.1°C measurement accuracy over 0–70°C without recalibration. |
Use Scenario: Solar-powered environmental node measuring soil moisture via capacitive sensor with microamp bias current. IC Role / Device Role / Timing Role: Micropower signal conditioner converting high-impedance sensor output to ratiometric voltage for SAR ADC. Use Value: 3–6 nA input bias current prevents sensor polarization; 17 µA supply current enables >5-year operation on 1 Ah Li-SOCl₂ cell. |
| Thermocouple Amplifier | Micropower Sample-and-Hold |
Use Scenario: Cold-junction compensation and amplification of Type-K thermocouple outputs in industrial data loggers. IC Role / Device Role / Timing Role: Dual op amp configured as precision instrumentation amplifier (with external resistors) and reference buffer. Use Value: 130 dB channel separation prevents cross-talk between thermocouple and cold-junction sensing paths. |
Use Scenario: Ultra-low-power sample-and-hold stage capturing slow-varying analog sensor outputs in duty-cycled IoT endpoints. IC Role / Device Role / Timing Role: One amplifier acts as unity-gain buffer driving hold capacitor; second provides reset control logic interface. Use Value: 250 pA max input offset current minimizes hold-step error; 17 µA quiescent current aligns with sub-µA sleep budgets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX478ACPA | Guaranteed 30–70 µV VOS (vs. 50–170 µV for MAX478CPA); tighter initial offset spec | Preferred where factory-calibrated DC accuracy is required without post-assembly trimming | Select MAX478ACPA when <50 µV initial offset is mandatory; otherwise MAX478CPA offers cost advantage |
| TLV2462IDR | Higher 22 µA supply current; 150 µV VOS; rail-to-rail I/O; SOIC-8 only | Better drive strength (15 mA) but higher power; no DIP option for through-hole prototyping | Choose TLV2462IDR if SOIC-8 footprint and stronger output drive are acceptable trade-offs for newer designs |
Compared with MAX478ACPA, MAX478CPA trades guaranteed low-offset performance for broader tolerance and lower cost; versus TLV2462IDR, it delivers lower quiescent current and DIP packaging but lacks rail-to-rail input and higher output current capability.
Availability
MAX478CPA is available at Aetrix Electronics and suitable for portable instrumentation, remote sensor amplifiers, and thermocouple signal conditioning requiring stable component supply and long-lifecycle support for legacy industrial systems.
Supply support for MAX478CPA 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, communications, and consumer applications.
The MAX478CPA belongs to Maxim's micropower precision op amp product line, engineered specifically for battery- and energy-harvesting–powered systems demanding ultra-low supply current without sacrificing DC accuracy.
FAQ
Is MAX478CPA recommended for new designs?
No, MAX478CPA is Not Recommended for New Designs per Maxim's official documentation. The wafer process used is obsolete, and Maxim advises evaluating replacements like MAX478ACPA or industry alternatives. MAX478CPA remains supported for existing production with full datasheet availability and legacy supply chain access through Aetrix Electronics.
What is the maximum operating supply voltage for MAX478CPA?
The absolute maximum supply voltage for MAX478CPA is ±22 V, with guaranteed operation from 2.2 V single supply up to ±15 V dual supply. At 5 V single supply, all key parameters - including 70 µV max offset voltage and 17 µA supply current - are fully specified over 0°C to +70°C.
Does MAX478CPA support true rail-to-rail input?
No, MAX478CPA does not support rail-to-rail input. Its input common-mode range extends to ground (0 V) but only up to 3.5 V at 5 V supply - i.e., within 1.5 V of V+. However, its ability to accept 0 V input makes it suitable for ground-referenced sensors without level-shifting circuitry.
Can MAX478CPA drive a 2 kΩ load to ground?
Yes, MAX478CPA can drive a 2 kΩ load to ground with a typical output low voltage of 0.2–0.6 mV at 0°C to +70°C. This capability eliminates external pull-down resistors in single-supply configurations, reducing component count and power loss in micropower systems using MAX478CPA.
What is the guaranteed input offset voltage drift for MAX478CPA over temperature?
MAX478CPA guarantees a maximum input offset voltage drift of 2.2 µV/°C over 0°C to +70°C (per MAX478C grade). At extended temperatures (−40°C to +85°C), the drift increases to 3.0 µV/°C for the E-grade variant, but MAX478CPA itself is rated only for 0°C to +70°C operation.
MAX478CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Differential
- Slew Rate:
- 0.04V/µs
- Gain Bandwidth Product:
- 85 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 3 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 13µA (x2 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX478CPA FAQ
1.How can I place an order for MAX478CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX478CPA 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 MAX478CPA reliable?
The price and inventory of MAX478CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX478CPA is usually 5 days.
3.What payment methods are accepted for MAX478CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX478CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX478CPA?
MAX478CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX478CPA 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 MAX478CPA?
For technical support, including MAX478CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX478CPA requirements.
6.How does Aetrix verify that MAX478CPA is sourced from the original manufacturer or authorized distributors?
All MAX478CPA 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 MAX478CPA meets industry standards.
7.What is the process for return or replacement of MAX478CPA?
All MAX478CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX478CPA, 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 MAX478CPA part is unused and in its original packaging.
Return procedure for MAX478CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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