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Analog Devices Inc./Maxim Integrated MAX473CUA+
- Part No.:
- MAX473CUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX473CUA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,916
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Product details
Overview
MAX473CUA+ from Maxim Integrated is a single-channel, rail-to-rail output operational amplifier optimized for single-supply portable applications. It delivers 10MHz unity-gain bandwidth, 15V/µs slew rate, ±2.0mV input offset voltage (typ), 2mA supply current per amplifier, and rail-to-rail output swing within ±50mV of both rails - enabling precision signal conditioning in battery-powered instrumentation.
For engineers reviewing the MAX473CUA+ datasheet, MAX473CUA+ pinout, MAX473CUA+ application, or MAX473CUA+ equivalent, key selection considerations include its µMAX-8 package footprint, guaranteed performance across 0°C to +70°C, single-supply operation down to 2.7V, and suitability for servo-loop feedback, discrete filter stages, and low-voltage signal buffering where fast settling and low quiescent current are critical.
Technical Context
The MAX473CUA+ employs a bipolar input stage with output transistors biased for rail-to-rail swing, supporting true single-supply operation from 2.7V to 5.25V. Its unity-gain stability is verified with 10kΩ || 20pF loads, and phase margin remains ≥63° under those conditions.
Input common-mode range extends to the negative rail (VEE), and bias currents flow *out* of both inputs - requiring matched source impedances to minimize offset error. The device lacks external offset null capability in dual/quad variants but retains pins 1 and 8 for trimming on the MAX473CUA+.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.25V single supply - enables direct interface with 3V and 3.3V logic/system rails without level-shifting. |
| Unity-Gain Bandwidth | 10MHz (guaranteed) - supports stable closed-loop gain ≥1 up to 10MHz, suitable for anti-aliasing and reconstruction filters. |
| Slew Rate | 15V/µs min - ensures ≤700ns settling to 0.1% for 1V step, critical for pulse amplification and fast transient response. |
| Output Swing | Rail-to-rail within ±50mV - preserves dynamic range in low-voltage systems (e.g., 3V ADC drivers). |
| Input Offset Voltage | ±2.0mV max at +25°C - enables accurate DC-coupled amplification in sensor front-ends without calibration. |
| Supply Current | 2.0mA per amplifier (typ) - balances speed and power efficiency for battery life-sensitive portable designs. |
| Input Common-Mode Range | Includes VEE (0V) - allows ground-referenced input signals without level-shifting circuitry. |
Pinout & Package
MAX473CUA+ uses the 8-pin µMAX package (3.0mm × 3.0mm, 0.5mm pitch), Maxim's smallest SO-compatible outline. Pin 1 is marked by a dot; pin numbering follows standard SO convention (counterclockwise from top-left corner).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null (–) | Connects to one end of 2kΩ potentiometer for input offset trimming; wiper ties to VEE (pin 4). |
| 2 | Inverting Input (IN–) | Differential input node; bias current flows *out*, requiring matched impedance to noninverting input. |
| 3 | Noninverting Input (IN+) | Differential input node; bias current flows *out*, requires impedance matching to IN– for minimal offset error. |
| 4 | Negative Supply (VEE) | Ground reference for single-supply operation; substrate tied internally to this pin. |
| 5 | No Connect (N.C.) | Not internally bonded - must remain unconnected; no routing or pull-up/pull-down required. |
| 6 | Output (OUT) | Class-AB output stage capable of sourcing/sinking 5mA; short-circuit protected. |
| 7 | Positive Supply (VCC) | Primary power rail; requires 0.1µF ceramic bypass capacitor to VEE for stability. |
| 8 | Offset Null (+) | Connects to other end of 2kΩ potentiometer; used with pin 1 and VEE to null input offset voltage. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Swings to within 50mV of VEE and VCC - maximizes usable output voltage range in 3V systems. |
| 15V/µs minimum slew rate | Enables full-power bandwidth >1MHz at 1Vpp output - supports high-fidelity audio and data acquisition waveforms. |
| 2mA supply current per amplifier | Delivers 10MHz bandwidth at <2mA - achieves 5MHz/mA efficiency, superior to legacy low-power op amps. |
| Input range includes negative rail | Accepts 0V input with VEE = 0V - eliminates need for input biasing networks in ground-referenced sensors. |
| µMAX-8 package | 3.0mm × 3.0mm footprint - saves >50% board area vs. standard SO-8, ideal for space-constrained wearables and handhelds. |
Applications
| Battery-Powered Instrumentation | Portable Signal Conditioning |
|---|---|
|
Use Scenario: Precision analog front-end in handheld multimeters and portable gas analyzers operating from 3V coin cells. IC Role / Device Role / Timing Role: Single-supply op amp configured as programmable-gain amplifier and buffer driving 12-bit SAR ADC. Use Value: Rail-to-rail output ensures full ADC code utilization; 2mA quiescent current extends battery life beyond 100 hours. |
Use Scenario: Low-noise signal chain in Bluetooth-enabled ECG patches with 3.3V supply. IC Role / Device Role / Timing Role: First-stage amplifier for dry-electrode biopotential signals, followed by active high-pass filtering. Use Value: Input bias current flowing *out* simplifies electrode bias network design; 10MHz GBW supports >1kHz physiological bandwidth. |
| Servo-Loop Feedback Amplifier | Discrete Active Filter Stage |
|
Use Scenario: Position-error amplifier in compact DC motor controllers powered by 5V buck converters. IC Role / Device Role / Timing Role: High-speed error amplifier in closed-loop velocity control path with <1µs response requirement. Use Value: 15V/µs slew rate prevents phase lag in feedback path; unity-gain stability avoids compensation complexity. |
Use Scenario: Second-order bandpass filter (fo = 190kHz, Q = 10) in ultrasonic time-of-flight distance sensors. IC Role / Device Role / Timing Role: Gain stage and integrator in state-variable filter topology using 1/4 MAX475 (dual variant). Use Value: Guaranteed 10MHz GBW ensures filter Q and center frequency accuracy; rail-to-rail swing maintains SNR at low supply. |
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 |
|---|---|---|---|
| TLV2461CDBVR | CMOS input (0.1pA IB), lower supply current (600µA), 6.4MHz GBW - trades speed for ultra-low power and rail-to-rail I/O. | Better for nanoamp-sensor interfaces; insufficient slew rate (1.6V/µs) for servo-loop or wideband filter use. | Select TLV2461CDBVR only when input bias current <1pA is mandatory and bandwidth ≤6MHz suffices. |
| OPA340UA | RRIO, 5.5MHz GBW, 1.5V/µs slew rate, 750µA IQ - optimized for lowest noise (16nV/√Hz) and precision DC performance. | Superior DC specs (25µV VOS) but inadequate for >100kHz AC-coupled signal paths due to limited bandwidth/speed. | Choose OPA340UA for high-resolution weigh-scale bridges or thermocouple amplifiers where DC accuracy dominates. |
Compared with TLV2461CDBVR and OPA340UA, MAX473CUA+ uniquely balances 10MHz bandwidth, 15V/µs slew rate, and 2mA supply current in a 3mm × 3mm package - making it the only viable option among the three for real-time, low-voltage, wideband analog signal processing where both speed and size are constrained.
Availability
MAX473CUA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable signal conditioning, servo-loop feedback, and discrete active filter applications requiring stable component supply and long-term obsolescence management.
Supply support for MAX473CUA+ 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, communications, and consumer systems.
The MAX473CUA+ belongs to Maxim's precision single-supply op amp family, designed specifically for space- and power-constrained portable equipment requiring rail-to-rail output swing, fast settling, and robust single-supply operation from 2.7V.
FAQ
What is the operating temperature range for MAX473CUA+?
The MAX473CUA+ is specified for operation from 0°C to +70°C. This commercial-grade temperature range aligns with its intended use in portable consumer and industrial instrumentation where ambient conditions remain within controlled environments. The device's electrical characteristics - including input offset voltage, slew rate, and bandwidth - are guaranteed across this full range, not just at +25°C. MAX473CUA+ does not support extended or military temperature grades.
Does MAX473CUA+ support dual-supply operation?
Yes, MAX473CUA+ supports dual-supply operation from ±1.35V to ±2.625V, as confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables. When used with dual supplies, VEE becomes the negative rail (e.g., –2.5V) and VCC the positive rail (e.g., +2.5V), preserving rail-to-rail output swing and input common-mode range. However, the MAX473CUA+ pinout and µMAX package are optimized for single-supply PCB layouts; dual-supply use requires careful grounding and bypassing per the datasheet recommendations.
Is MAX473CUA+ pin-compatible with other packages in the MAX473 family?
Yes, MAX473CUA+ shares identical pinout and function with MAX473CPA (DIP-8) and MAX473CSA (SO-8), as explicitly stated in the "Pin Configurations" section and confirmed by the shared top-view diagram. All three variants use industry-standard op-amp pin assignments: pin 2 = IN–, pin 3 = IN+, pin 4 = VEE, pin 6 = OUT, pin 7 = VCC. This allows direct substitution in existing SO-8 or DIP-8 footprints when migrating to the smaller µMAX-8 package - provided board layout accommodates the reduced 3.0mm × 3.0mm outline and 0.5mm pitch.
What is the purpose of pins 1 and 8 on MAX473CUA+?
Pins 1 and 8 on MAX473CUA+ are dedicated offset null terminals, enabling external trimming of input offset voltage using a 2kΩ potentiometer (wiper to VEE). This feature is unique to the single-amplifier MAX473 variants - the dual MAX474 and quad MAX475 lack these pins and do not support external offset adjustment. For MAX473CUA+, connecting the potentiometer between pins 1 and 8 with the wiper to VEE allows reduction of initial offset to <100µV, critical for high-accuracy DC-coupled applications like precision weight scales or calibrated sensor interfaces.
Why is MAX473CUA+ labeled 'Not Recommended for New Designs'?
MAX473CUA+ is marked "Not Recommended for New Designs" because it was manufactured using a wafer process that Maxim no longer supports - not due to performance limitations. The device remains fully functional and available through authorized distributors and Aetrix Electronics' legacy inventory. For new designs, Maxim recommends migration paths such as the MAX44260 (low-power RRIO) or OPAx320 series (precision CMOS), but MAX473CUA+ continues to be supported for existing products requiring exact form-fit-function replacement, especially where its 10MHz/15V/µs performance envelope and µMAX footprint are irreplaceable.
MAX473CUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-µMAX
MAX473CUA+ FAQ
1.How can I place an order for MAX473CUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX473CUA+ 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 MAX473CUA+ reliable?
The price and inventory of MAX473CUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX473CUA+ is usually 5 days.
3.What payment methods are accepted for MAX473CUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX473CUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX473CUA+?
MAX473CUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX473CUA+ 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 MAX473CUA+?
For technical support, including MAX473CUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX473CUA+ requirements.
6.How does Aetrix verify that MAX473CUA+ is sourced from the original manufacturer or authorized distributors?
All MAX473CUA+ 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 MAX473CUA+ meets industry standards.
7.What is the process for return or replacement of MAX473CUA+?
All MAX473CUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX473CUA+, 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 MAX473CUA+ part is unused and in its original packaging.
Return procedure for MAX473CUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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