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Analog Devices Inc./Maxim Integrated MAX473CPA
- Part No.:
- MAX473CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX473CPA.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,754
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Product details
Overview
MAX473CPA from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier optimized for single-supply operation from +2.7V to +5.25V. It delivers 10MHz unity-gain bandwidth, 15V/µs minimum slew rate, 600Ω output drive capability, and rail-to-rail swing within ±50mV of both supply rails - enabling precision signal conditioning in portable battery-powered instrumentation.
For engineers reviewing the MAX473CPA datasheet, MAX473CPA pinout, MAX473CPA application, or MAX473CPA equivalent, key selection considerations include guaranteed 10MHz bandwidth at 3V supply, input voltage range extending to the negative rail (VEE), short-circuit protected output, and compatibility with industry-standard 8-pin DIP pinout for drop-in replacement in legacy analog signal paths.
Technical Context
The MAX473CPA employs a bipolar input stage with output transistors configured for rail-to-rail swing, achieving ±50mV output headroom at VCC = 3V and VEE = 0V. Its unity-gain stability is verified with 10kΩ || 20pF load and 63° phase margin, supporting robust small-signal transient response (≤400ns settling to 0.1%) and full-power bandwidth up to 477kHz at 2VPP.
Input bias current flows out of both IN+ and IN− terminals (0–150nA typ), requiring matched source impedances to minimize offset error. The device lacks external offset null capability beyond the dedicated NULL pins (1 & 8), distinguishing it from variants like MAX474/MAX475 where trimming is not supported.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.7V to +5.25V single supply (±1.35V to ±2.625V dual); enables direct interface with 3V microcontrollers and Li-ion battery systems. |
| Unity-Gain Bandwidth | 10MHz (guaranteed); supports stable closed-loop gain ≥1 with ≤100ns group delay in filter and buffer applications. |
| Slew Rate | 15V/µs minimum; ensures ≤200ns large-signal rise/fall time for 2V step into 10kΩ load. |
| Output Drive | 600Ω load capability with rail-to-rail swing to within 50mV of VCC/VEE; sustains linearity driving ADC reference buffers or sensor amplifiers. |
| Input Offset Voltage | ±2.5mV max (0°C to +70°C); meets precision DC-coupled requirements in servo-loop feedback paths. |
| Supply Current | 2.0mA per amplifier (typ at VCC = 3V); balances speed and power for always-on portable instrumentation. |
| CMRR / PSRR | 80dB min (DC to 10kHz); rejects supply ripple and common-mode noise in noisy industrial sensor front-ends. |
Pinout & Package
MAX473CPA is housed in an 8-pin plastic DIP package (0.300" wide) with industry-standard op-amp pinout compatible with legacy designs.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NULL | Offset null input; connect one end of 2kΩ potentiometer to this pin for manual VOS trimming (wiper to VEE, other end to pin 8). |
| 2 | IN− | Inverting input; high-impedance node requiring matched source resistance to IN+ to cancel IB-induced offset. |
| 3 | IN+ | Noninverting input; accepts signals down to VEE (0V), enabling true single-supply sensor interfacing. |
| 4 | VEE | Negative supply pin; tied to ground in single-supply mode; substrate connection point for ESD protection. |
| 5 | N.C. | No internal connection; must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 6 | OUT | Amplifier output; short-circuit protected; swings to within 50mV of VEE and VCC under 600Ω load. |
| 7 | VCC | Positive supply pin; requires 0.1µF ceramic bypass capacitor to ground for stability and channel separation >120dB. |
| 8 | NULL | Offset null input; second terminal for 2kΩ potentiometer; completing trim network with pin 1 and VEE. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Swings to within 50mV of VCC and VEE at 3V supply - preserves dynamic range in low-voltage data acquisition systems. |
| Input range includes negative rail | IN+ and IN− accept voltages down to VEE (0V) - eliminates level-shifting need for ground-referenced sensors. |
| 15V/µs min slew rate | Enables accurate reproduction of 190kHz bandpass-filtered signals (e.g., ultrasonic receiver outputs) without slew-induced distortion. |
| 2mA supply current per amp | Supports continuous operation in battery-powered devices with >100-hour runtime on two AA cells (3V, 2400mAh). |
| Short-circuit protected output | Withstands indefinite output-to-ground faults without damage - critical for test equipment and motor-control feedback circuits. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying low-level ECG or pulse oximeter transducer outputs in handheld diagnostic tools. IC Role / Device Role / Timing Role: Single-supply instrumentation amplifier front-end with rail-to-rail output driving 12-bit SAR ADC reference input. Use Value: 10MHz bandwidth captures fast QRS complexes; 2.5mV VOS ensures sub-10µV measurement accuracy over 0°C–70°C. |
Use Scenario: Conditioning thermistor and humidity sensor outputs in field-deployable environmental monitors. IC Role / Device Role / Timing Role: Precision DC-coupled signal conditioner with matched input impedance for bias-current cancellation. Use Value: 2mA quiescent current extends 5-year battery life; rail-to-rail swing maximizes ADC utilization across 2.7–3.6V battery discharge curve. |
| Discrete Active Filters | Servo-Loop Feedback Amplifiers |
Use Scenario: Implementing 4-pole 190kHz bandpass filter using cascaded MAX473 stages in ultrasonic flow meters. IC Role / Device Role / Timing Role: Unity-gain stable op-amp core in Sallen-Key topology with 10MHz GBW enabling sharp Q=10 response. Use Value: 15V/µs slew rate prevents distortion at filter passband edges; 600Ω drive sustains 82pF capacitor loads without peaking. |
Use Scenario: Closed-loop compensation amplifier in brushless DC motor position control systems. IC Role / Device Role / Timing Role: High-speed error amplifier comparing encoder feedback to PWM-modulated reference. Use Value: 400ns 0.1% settling time ensures real-time torque correction; short-circuit protection guards against winding fault transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-supply op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | Lower 1MHz GBW, 1V/µs slew rate, 65µA IQ; CMOS input (pA-level IB), no NULL pins. | Better for ultra-low-power sensor interfaces; unsuitable for 190kHz bandpass filtering or fast servo loops. | Select when power budget <100µA dominates; avoid if >5MHz bandwidth or >5V/µs slew required. |
| TLV2461CDR | 2.2MHz GBW, 1.6V/µs slew, 550µA IQ; rail-to-rail I/O, no NULL pins, higher VOS (±3.5mV). | Acceptable for DC-coupled loggers; cannot replicate MAX473CPA's 10MHz fidelity in active filters. | Choose for cost-sensitive industrial analog I/O where 2MHz bandwidth suffices and offset trim is unnecessary. |
Compared with LMV321IDBVR and TLV2461CDR, the MAX473CPA uniquely combines 10MHz bandwidth, 15V/µs slew, and external offset nulling in an 8-pin DIP - making it irreplaceable in legacy high-speed single-supply signal chains where PCB redesign is prohibited.
Availability
MAX473CPA is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, discrete active filters, and servo-loop feedback amplifiers requiring stable component supply amid obsolescence transitions.
Supply support for MAX473CPA 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 and mixed-signal ICs for power, sensing, and communication systems.
The MAX473/MAX474/MAX475 family was designed specifically for single-supply, high-speed precision analog signal conditioning in space-constrained portable equipment - prioritizing rail-to-rail output, low-voltage operation, and robust stability without external compensation.
FAQ
Is MAX473CPA still recommended for new designs?
No - Maxim explicitly states MAX473CPA is "Not Recommended for New Designs" due to discontinuation of its wafer fabrication process. It remains available for existing designs and legacy repair, but Aetrix recommends evaluating modern alternatives like MAX44260 or AD8605 for new projects requiring similar performance and long-term supply assurance.
What is the operating temperature range of MAX473CPA?
The MAX473CPA is rated for 0°C to +70°C ambient operation (Commercial grade). This is confirmed in the Ordering Information table, where "MAX473CPA" maps to "0°C to +70°C" and "8 Plastic DIP". Extended temperature versions (e.g., MAX473EPA) operate from –40°C to +85°C but use different part numbers.
Can MAX473CPA drive capacitive loads without instability?
Yes - the MAX473CPA is unity-gain stable with 10kΩ || 20pF loads (63° phase margin), but larger capacitive loads (>100pF) require isolation. As documented in Applications Information, adding a 10Ω series resistor between OUT and the load restores stability - validated for 1000pF loads using the Figure 4 circuit configuration.
Does MAX473CPA support dual-supply operation?
Yes - the MAX473CPA operates from dual supplies of ±1.35V to ±2.625V, as specified in Electrical Characteristics tables. In dual-mode, VEE connects to the negative rail (e.g., –2.5V), VCC to the positive rail (e.g., +2.5V), and input common-mode range extends to within 1.9V of either rail.
How is offset voltage trimmed on MAX473CPA?
Offset voltage on MAX473CPA is trimmed using pins 1 and 8 (both labeled NULL) with an external 2kΩ potentiometer: one end to pin 1, wiper to VEE (pin 4), and other end to pin 8. This configuration allows adjustment of input offset to <100µV, as shown in Figure 1 of the datasheet - a capability not available on MAX474 or MAX475 variants.
MAX473CPA 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:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 17V/µs
- Gain Bandwidth Product:
- 12 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 80 nA
- Voltage - Input Offset:
- 700 µV
- Current - Supply:
- 2mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX473CPA FAQ
1.How can I place an order for MAX473CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX473CPA 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 MAX473CPA reliable?
The price and inventory of MAX473CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX473CPA is usually 5 days.
3.What payment methods are accepted for MAX473CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX473CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX473CPA?
MAX473CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX473CPA 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 MAX473CPA?
For technical support, including MAX473CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX473CPA requirements.
6.How does Aetrix verify that MAX473CPA is sourced from the original manufacturer or authorized distributors?
All MAX473CPA 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 MAX473CPA meets industry standards.
7.What is the process for return or replacement of MAX473CPA?
All MAX473CPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX473CPA, 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 MAX473CPA part is unused and in its original packaging.
Return procedure for MAX473CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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