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Analog Devices Inc./Maxim Integrated MAX473ESA+
- Part No.:
- MAX473ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX473ESA+.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,105
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Product details
Overview
The MAX473ESA+ from Maxim Integrated is a single, rail-to-rail output, unity-gain-stable operational amplifier optimized for single-supply operation from 2.7V to 5.25V. It delivers 10MHz unity-gain bandwidth, 15V/µs minimum slew rate, and 600Ω output drive capability while consuming only 2mA per amplifier - enabling precision signal conditioning in battery-powered portable instrumentation and low-voltage servo-loop feedback paths.
For engineers reviewing the MAX473ESA+ datasheet, MAX473ESA+ pinout, MAX473ESA+ application, or MAX473ESA+ equivalent, key selection criteria include guaranteed rail-to-rail output swing (within ±50mV of rails), input voltage range extending to the negative supply rail, -40°C to +85°C industrial temperature rating, SO-8 package compatibility, and verified performance under 3V/5V single-supply conditions with capacitive load stability up to 20pF.
Technical Context
The MAX473ESA+ employs a bipolar input stage with output transistors configured for true rail-to-rail swing, achieving VOH ≥ VCC – 0.05V and VOL ≤ VEE + 0.05V at 25°C. Its unity-gain stability is confirmed across 3V–5V supplies with 10kΩ || 20pF loads, delivering 63° phase margin and 12dB gain margin.
Designed for single-supply signal chains, it features input common-mode range inclusive of VEE, short-circuit protected outputs, and bias currents flowing *out* of both inputs - requiring matched external resistances to minimize offset error. The device exhibits no internal offset null pins beyond pins 1 and 8 (as specified for MAX473 variants), and supports full-power bandwidth up to ~2.4MHz at 2VPP output.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 5.25V single supply - enables direct interface with 3.3V and 5V logic/system rails without level-shifting. |
| Unity-Gain Bandwidth | 10MHz (min) - supports stable closed-loop operation up to 10MHz in noninverting buffer or gain-of-2 configurations. |
| Slew Rate | 15V/µs (min) - ensures ≤400ns settling to 0.1% for 1V step, critical for fast pulse amplification and active filter transient response. |
| Rail-to-Rail Output | Swings within 50mV of VCC and VEE - maximizes dynamic range in 3V systems, delivering >2.9VPP output swing at VCC = 3V. |
| Input Common-Mode Range | Includes VEE (0V) - allows ground-referenced sensor inputs (e.g., thermocouples, current-sense shunts) without level-shifting circuitry. |
| Supply Current | 2.0mA per amplifier (typ) - enables multi-channel designs in power-constrained portable equipment with predictable thermal budget. |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded control, battery management, and medical instrumentation environments. |
Pinout & Package
MAX473ESA+ is housed in an 8-pin SO (Small Outline) package, measuring 4.9mm × 3.9mm × 1.75mm, with standard op-amp pinout compatible with industry-layout practices and PCB footprints for SO-8 operational amplifiers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Offset Null Input (IN–) | Connects to one end of 2kΩ potentiometer for manual input offset trimming; wiper tied to VEE. |
| 2 | Inverting Input (IN–) | Differential input node; bias current flows *out*, requiring matched impedance to noninverting input for offset minimization. |
| 3 | Noninverting Input (IN+) | Differential input node; common-mode range extends to VEE, enabling ground-referenced signal acquisition. |
| 4 | Negative Supply (VEE) | Ground reference pin for single-supply operation; substrate tied to VEE per die topography. |
| 5 | No Connect (N.C.) | Not internally bonded; must be left floating or grounded per layout best practice - no functional connection. |
| 6 | Output (OUT) | Class-AB output stage capable of sourcing/sinking 5mA; short-circuit protected with continuous duty cycle rating. |
| 7 | Positive Supply (VCC) | Primary power rail; requires 0.1µF ceramic bypass capacitor to ground for stability and PSRR optimization. |
| 8 | Offset Null Input (IN+) | Connects to other end of 2kΩ potentiometer; used with Pin 1 and Pin 4 to trim input offset voltage down to <±0.8mV. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers usable output headroom within 50mV of both supply rails - preserves >97% of 3V supply range for analog signal fidelity. |
| Unity-gain stable architecture | Guaranteed stable with 10kΩ || 20pF load - eliminates need for external compensation in most buffer and gain-stage applications. |
| Input range includes negative rail | Accepts signals down to VEE (0V) - enables direct interfacing with unipolar sensors and single-ended ADC drivers without level shifters. |
| Low 2mA quiescent current | Enables integration into multi-amplifier signal chains in battery-powered devices with <10µA standby leakage impact. |
| Short-circuit protected output | Withstands indefinite output-to-ground shorts - improves system robustness in motor-drive feedback or I/O protection circuits. |
| SO-8 industrial temperature grade | Qualified from -40°C to +85°C in JEDEC-standard SOIC-8 package - ensures long-term reliability in automotive cabin and industrial PLC modules. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Amplifying low-level ECG or pulse oximeter photodiode signals in handheld diagnostic tools powered by two AA cells (3V). IC Role / Device Role / Timing Role: Single-supply transimpedance amplifier and DC-coupled gain stage, providing rail-to-rail output swing to maximize ADC input utilization. Use Value: 10MHz bandwidth and 15V/µs slew rate preserve high-frequency QRS complex morphology; 2mA supply current extends battery life beyond 100 hours. |
Use Scenario: Conditioning thermistor and humidity sensor outputs in field-deployable environmental monitors operating on Li-ion batteries (3.0–4.2V). IC Role / Device Role / Timing Role: Precision unity-gain buffer isolating high-impedance sensor elements from multiplexed ADC inputs. Use Value: Input common-mode range including ground allows direct sensor grounding; rail-to-rail output ensures full-scale ADC conversion across entire battery discharge curve. |
| Industrial Servo Feedback | Discrete Active Filters |
Use Scenario: Closed-loop position error amplification in compact BLDC motor controllers where PCB space limits use of larger op-amps. IC Role / Device Role / Timing Role: High-speed error amplifier in PID loop with 3.3V microcontroller interface and analog PWM generation. Use Value: 400ns 0.1% settling time ensures rapid correction of mechanical disturbances; SO-8 footprint fits tight motor-driver board layouts. |
Use Scenario: Implementing 4th-order bandpass filter (f0 = 190kHz, Q = 10) using discrete RC networks and quad MAX475 - MAX473ESA+ serves as reference design validation unit. IC Role / Device Role / Timing Role: Single-channel verification unit for filter pole placement, gain accuracy, and phase linearity testing. Use Value: Guaranteed 10MHz GBW and 63° phase margin ensure filter transfer function matches theoretical model within ±0.5dB up to 200kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-supply, rail-to-rail output op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | Lower 1MHz GBW, 1V/µs slew rate, 65°C max temp rating; CMOS input (pA bias), not bipolar. | Insufficient speed for servo-loop or active filter use; better for ultra-low-power sensor buffering only. | Select LMV321IDBVR only when supply current <80µA is mandatory and bandwidth <1.5MHz suffices. |
| TSV911ICT | Higher 8MHz GBW but only 0.8V/µs slew rate; rail-to-rail input/output; 12V max supply; -40°C to +125°C rating. | Lacks required 15V/µs slew for fast-settling applications; wider supply range adds complexity in 3V-only systems. | Choose TSV911ICT if extended temperature range is critical and slew rate requirements are relaxed below 1V/µs. |
Compared with LMV321IDBVR and TSV911ICT, the MAX473ESA+ uniquely balances 10MHz bandwidth, 15V/µs slew rate, rail-to-rail output, and -40°C to +85°C SO-8 qualification - making it the only option among the three suitable for 3V-powered servo loops and active filters demanding sub-500ns settling.
Availability
MAX473ESA+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, and industrial servo feedback systems requiring stable component supply with guaranteed long-term industrial temperature support.
Supply support for MAX473ESA+ 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 applications.
The MAX473ESA+ belongs to Maxim's precision single-supply op amp product line, engineered specifically for low-voltage, rail-to-rail signal conditioning in portable and battery-operated systems where speed, accuracy, and power efficiency are co-optimized.
FAQ
What is the maximum capacitive load the MAX473ESA+ can drive without external isolation?
The MAX473ESA+ maintains stability with up to 20pF capacitive load in parallel with 10kΩ, as verified by 63° phase margin measurements. Driving larger capacitances (e.g., >50pF) requires an output isolation resistor (typically 10–100Ω) between the amplifier output and load to prevent peaking or oscillation - a technique validated in Maxim's Application Note 473 TOC-13 and Figure 4.
Does the MAX473ESA+ support dual-supply operation?
Yes, the MAX473ESA+ operates from dual supplies of ±1.35V to ±2.625V, as specified in its Absolute Maximum Ratings and Electrical Characteristics tables. However, its primary design focus is single-supply use: input common-mode range includes VEE, and rail-to-rail output swing is optimized for 0V-referenced systems - dual-supply use is supported but not the intended application emphasis.
Can the input offset voltage of the MAX473ESA+ be trimmed externally?
Yes - the MAX473ESA+ provides dedicated offset null pins (Pins 1 and 8) allowing external adjustment via a 2kΩ potentiometer connected between them and VEE. This configuration reduces input offset voltage to <±0.8mV at 25°C, as documented in Figure 1 and Applications Information section. This feature is unique to the MAX473 (single) variant; MAX474/MAX475 lack these pins.
What is the minimum recommended bypass capacitance for the MAX473ESA+ VCC pin?
A minimum 0.1µF ceramic capacitor placed between VCC (Pin 7) and VEE (Pin 4) is required for stable operation and optimal PSRR. Maxim's datasheet specifies this value for single-supply configurations; adding a bulk 10µF tantalum capacitor in parallel further improves low-frequency noise rejection and transient response in battery-powered systems.
Is the MAX473ESA+ pin-compatible with other op-amps in SO-8 packages?
The MAX473ESA+ uses the industry-standard SO-8 op-amp pinout (Pin 1 = offset null, Pin 2 = IN–, Pin 3 = IN+, Pin 4 = VEE, Pin 5 = N.C., Pin 6 = OUT, Pin 7 = VCC, Pin 8 = offset null), matching legacy parts like OP27 and AD822. However, functional compatibility requires verification of bandwidth, slew rate, and input stage type - it is not a drop-in replacement for JFET or CMOS-input op-amps due to its bipolar architecture and output drive characteristics.
MAX473ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX473ESA+ FAQ
1.How can I place an order for MAX473ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX473ESA+ 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 MAX473ESA+ reliable?
The price and inventory of MAX473ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX473ESA+ is usually 5 days.
3.What payment methods are accepted for MAX473ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX473ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX473ESA+?
MAX473ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX473ESA+ 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 MAX473ESA+?
For technical support, including MAX473ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX473ESA+ requirements.
6.How does Aetrix verify that MAX473ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX473ESA+ 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 MAX473ESA+ meets industry standards.
7.What is the process for return or replacement of MAX473ESA+?
All MAX473ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX473ESA+, 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 MAX473ESA+ part is unused and in its original packaging.
Return procedure for MAX473ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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