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Analog Devices Inc./Maxim Integrated MAX4128ESA+
- Part No.:
- MAX4128ESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX4128ESA+.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:191
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Product details
Overview
MAX4128ESA+ from Maxim Integrated is a dual, decompensated, rail-to-rail input/output operational amplifier optimized for high-speed, low-power, single-supply signal conditioning. It delivers 25MHz gain-bandwidth product, 10V/µs slew rate, 200µV max input offset voltage, and operates from +2.7V to +6.5V with 650µA per amplifier quiescent current. It is used in precision data-acquisition front-ends where bandwidth and DC accuracy coexist under tight power budgets.
For engineers reviewing the MAX4128ESA+ datasheet, MAX4128ESA+ pinout, MAX4128ESA+ application, or MAX4128ESA+ equivalent, key selection criteria include its decompensated stability (G ≥ 10), dual-channel SO-8 package, rail-to-rail I/O swing into 250Ω loads, and shutdown capability shared across both amplifiers - critical for portable instrumentation and battery-powered sensor interfaces.
Technical Context
The MAX4128ESA+ employs a composite NPN/PNP rail-to-rail input stage enabling common-mode operation 250mV beyond VEE and VCC, with seamless transition near mid-supply to minimize CMRR degradation. Its decompensated architecture achieves 25MHz GBW while maintaining phase margin >60° at closed-loop gains ≥10.
It features matched dual amplifiers sharing a single SHDN pin that places both outputs in high-impedance state and reduces total supply current to ≤70µA (2×35µA typ). Output drive capability includes stable operation into 500pF capacitive loads and full swing into 250Ω resistive loads with <25mV headroom at either rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 25MHz - enables stable closed-loop operation at gain ≥10 with usable bandwidth up to ~2.5MHz |
| Slew Rate | 10V/µs - supports clean 2Vpp signals up to ~1.6MHz without slewing distortion |
| Input Offset Voltage | ±200µV max - ensures <0.02% gain error in 1V full-scale precision buffer or gain stage |
| Supply Current per Amp | 650µA typ - allows dual-channel operation at <1.3mA total, ideal for always-on sensor interfaces |
| Output Swing | Rail-to-rail into 250Ω - delivers 0.025V to VCC–0.025V swing on +3V supply, preserving dynamic range |
| Capacitive Load Stability | Stable with ≤500pF - eliminates need for isolation resistors in ADC driver or filter applications |
| Common-Mode Range | VEE – 0.25V to VCC + 0.25V - accepts inputs down to ground and up to supply in single-supply systems |
Pinout & Package
MAX4128ESA+ is housed in an 8-pin SO (Small Outline) package, 150mil width, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Amplifier 1 output - drives external load or feedback network; rail-to-rail capable |
| 2 | IN1− | Inverting input of Amp1 - connects to feedback resistor or inverting node |
| 3 | IN1+ | Noninverting input of Amp1 - accepts reference, sensor, or signal source |
| 4 | VEE | Negative supply / ground - return path for both amplifiers and SHDN logic |
| 5 | VCC | Positive supply - powers both amplifiers and internal bias circuitry |
| 6 | IN2+ | Noninverting input of Amp2 - independent signal path; matches Amp1 electrical specs |
| 7 | IN2− | Inverting input of Amp2 - fully symmetrical to Pin 2; supports dual-channel configurations |
| 8 | SHDN | Shared shutdown control - logic-low disables both amps; high-impedance outputs and <70µA total ICC |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated 25MHz GBW | Enables high closed-loop gain (>10V/V) with usable bandwidth exceeding unity-gain stable alternatives |
| Rail-to-rail I/O with extended CMVR | Supports direct interfacing to 0–3.3V sensors and ADCs without level-shifting or supply overhead |
| Single SHDN pin for dual channels | Reduces system GPIO count and simplifies power sequencing in space-constrained designs |
| Stable into 500pF capacitive loads | Eliminates output isolation resistors in anti-aliasing filter or cable-driving applications |
| Low 650µA per amplifier ICC | Permits continuous operation in battery-powered devices with multi-day runtime on coin cells |
Applications
| Battery-Powered Instrumentation | Portable Data Loggers |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or shunt voltage signals. IC Role / Device Role: Precision, low-noise, rail-to-rail input buffer and programmable-gain stage before 16-bit SAR ADC. Use Value: 200µV offset and 25MHz GBW enable sub-0.1°C temperature resolution and fast sampling without settling delay. | Use Scenario: Compact environmental sensor node acquiring temperature, humidity, and pressure with microcontroller ADC. IC Role / Device Role: Dual-channel signal conditioner: one amp buffers sensor output, second drives reference or filters noise. Use Value: Dual SO-8 integration reduces PCB area vs. two discrete op-amps; 650µA/amp extends battery life beyond 12 months. |
| Low-Voltage Sensor Interfaces | Precision ADC Drivers |
Use Scenario: Industrial IoT node measuring 4–20mA loop current via low-side shunt with 3.3V MCU supply. IC Role / Device Role: Single-supply current-sense amplifier with rail-to-rail output driving MCU analog input. Use Value: Input CMVR extending below ground (VEE – 0.25V) accommodates shunt placed on negative side without level shift. | Use Scenario: Driving SAR ADC input with fast-settling, low-distortion signal after anti-aliasing filter. IC Role / Device Role: High-speed, low-offset buffer isolating filter from ADC input capacitance. Use Value: 10V/µs slew rate and 500pF load stability ensure <1µs settling to 16-bit accuracy, eliminating external isolation R. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual, high-speed, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2350UA | Unity-gain stable, 38MHz GBW, 11V/µs slew, no shutdown, SO-8 | Requires gain ≥1 for stability; better speed but lacks power control | Select when unity-gain configuration or higher bandwidth is mandatory and shutdown is unnecessary |
| AD8602ARZ | Unity-gain stable, 10MHz GBW, 5V/µs slew, no shutdown, SO-8 | Lower bandwidth and slew rate; lower ICC (850µA total), no SHDN | Select for cost-sensitive, lower-speed precision apps where shutdown and 25MHz are not required |
Compared with OPA2350UA and AD8602ARZ, MAX4128ESA+ uniquely combines decompensated 25MHz bandwidth, integrated shutdown, and rail-to-rail I/O in SO-8 - making it optimal for battery-powered, gain ≥10 signal chains needing active power management.
Availability
MAX4128ESA+ is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable data loggers, and precision ADC driver applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for MAX4128ESA+ 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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, medical, and communications systems.
The MAX4122–MAX4129 family was engineered for low-voltage, single-supply data-acquisition systems requiring simultaneous high speed, rail-to-rail I/O, and ultra-low quiescent current - targeting portable test equipment and sensor signal chains.
FAQ
What is the minimum operating supply voltage for MAX4128ESA+?
The MAX4128ESA+ is specified to operate from +2.7V to +6.5V. However, characterization shows functional operation down to +1.8V at room temperature, though parameters like GBW and output swing degrade below 2.7V. For production designs, maintain ≥2.7V to guarantee all specifications per the datasheet.
Is MAX4128ESA+ unity-gain stable?
No, MAX4128ESA+ is decompensated and stable only at closed-loop gains of 10V/V or greater. Attempting unity-gain or gain-of-2 configurations will cause oscillation. Use unity-gain stable alternatives like MAX4126ESA+ or AD8602ARZ if lower gain is required.
Does MAX4128ESA+ support independent shutdown per channel?
No. MAX4128ESA+ has a single SHDN pin that simultaneously disables both amplifiers. When SHDN is pulled low (<0.8V), both outputs enter high-impedance state and total supply current drops to ≤70µA. Independent channel shutdown is not supported in this variant.
What is the maximum capacitive load MAX4128ESA+ can drive stably?
MAX4128ESA+ is characterized and guaranteed stable with capacitive loads up to 500pF without external compensation. Driving larger loads (e.g., >1nF cables or ADC input capacitance plus trace capacitance) requires an isolation resistor (e.g., 39Ω–56Ω) in series with the output to restore phase margin.
Can MAX4128ESA+ be used with dual supplies?
Yes. MAX4128ESA+ supports dual-supply operation from ±1.35V to ±3.25V. The input common-mode range extends 250mV beyond each rail, and rail-to-rail output swing remains valid. Ensure SHDN is referenced to VEE (not ground) and meets logic thresholds relative to local supplies.
MAX4128ESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 25 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 250 µV
- Current - Supply:
- 725µA (x2 Channels)
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX4128ESA+ FAQ
1.How can I place an order for MAX4128ESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4128ESA+ 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 MAX4128ESA+ reliable?
The price and inventory of MAX4128ESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4128ESA+ is usually 5 days.
3.What payment methods are accepted for MAX4128ESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4128ESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4128ESA+?
MAX4128ESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4128ESA+ 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 MAX4128ESA+?
For technical support, including MAX4128ESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4128ESA+ requirements.
6.How does Aetrix verify that MAX4128ESA+ is sourced from the original manufacturer or authorized distributors?
All MAX4128ESA+ 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 MAX4128ESA+ meets industry standards.
7.What is the process for return or replacement of MAX4128ESA+?
All MAX4128ESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX4128ESA+, 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 MAX4128ESA+ part is unused and in its original packaging.
Return procedure for MAX4128ESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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