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Analog Devices Inc./Maxim Integrated MAX4321EUK
- Part No.:
- MAX4321EUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4321EUK.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,695
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Product details
Overview
The MAX4321EUK from Maxim Integrated is a low-voltage, rail-to-rail input/output operational amplifier optimized for precision signal conditioning in single-supply systems. It delivers 5MHz gain-bandwidth, 2V/µs slew rate, ±1.2mV max input offset voltage, 650µA quiescent current, and full rail-to-rail swing into 250Ω loads - enabling high-accuracy analog front-ends in battery-powered data-acquisition systems.
For engineers reviewing the MAX4321EUK datasheet, MAX4321EUK pinout, MAX4321EUK application, or MAX4321EUK equivalent, this op amp is selected for low-noise sensor interfaces, portable instrumentation amplifiers, and rail-to-rail ADC driver stages where supply headroom below 2.4V and output drive capability to within 200mV of rails are critical design requirements.
Technical Context
The MAX4321EUK employs dual complementary input stages (NPN and PNP) to achieve true rail-to-rail common-mode input range extending from VEE to VCC, with seamless switchover near VCC/2. Its output stage uses a Class AB architecture capable of sourcing/sinking >50mA to drive 250Ω loads while maintaining <200mV saturation margin at both rails.
This device is unity-gain stable with capacitive loads up to 500pF without external compensation, and features no phase reversal under overdriven inputs - a direct result of its protected differential input structure with 1kΩ series resistors and back-to-back triple diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 5MHz - supports stable closed-loop operation up to 100kHz at AV = +50 with adequate phase margin. |
| Slew Rate | 2V/µs - enables accurate reproduction of 318kHz full-scale 1Vpp sine waves without distortion. |
| Input Offset Voltage | ±1.2mV (max) - contributes ≤0.024% error in 5V full-scale 12-bit systems. |
| Quiescent Current | 650µA - allows continuous operation for >1 year on a 200mAh coin cell in sleep-aware portable instruments. |
| Rail-to-Rail Output Swing | Within 200mV of either rail into 250Ω - ensures >92% dynamic range utilization with 3.3V ADCs. |
| Capacitive Load Drive | Stable up to 500pF - eliminates need for isolation resistors in LCD bias or filter buffer applications. |
| Supply Voltage Range | +2.4V to +6.5V single supply - operates reliably across Li-ion (3.0–4.2V) and two-AA (2.4–3.2V) battery stacks. |
Pinout & Package
MAX4321EUK is housed in a 5-pin SOT23-5 package (top mark: ADOA), measuring 2.9mm × 1.6mm × 1.1mm, rated for -40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Class AB rail-to-rail stage capable of ±50mA drive; connects directly to ADC input or transimpedance feedback node. |
| 2 - VCC | Positive supply | Accepts +2.4V to +6.5V; requires 0.1µF ceramic + ≥1µF bulk bypass to ground for stability. |
| 3 - IN+ | Noninverting input | High-impedance node (500kΩ typical); matched impedance to IN- minimizes bias-current-induced offset. |
| 4 - IN- | Inverting input | Differential pair input; polarity-sensitive in active-filter configurations; protected by 1kΩ series resistor. |
| 5 - VEE | Negative supply / ground reference | Connected to system ground in single-supply mode; defines lower rail for rail-to-rail input common-mode range. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | VEE to VCC - enables direct sensing of signals at ground or supply rail in single-supply sensor interfaces. |
| No phase reversal on overdrive | Input protection diodes prevent latch-up and output inversion when IN+ or IN- exceeds rails by >1.8V. |
| Unity-gain stability with 500pF load | Eliminates need for output isolation resistors in capacitive DAC buffers or piezo-driver circuits. |
| Low input voltage noise density | 22nV/√Hz at 1kHz - preserves SNR in 16-bit sensor signal chains with bandwidth <100kHz. |
| Pin-for-pin upgrade from LMC7101 | Direct replacement with 5× higher bandwidth and 2× faster slew rate - no PCB redesign required. |
Applications
| Battery-Powered Instrumentation | Portable Medical Sensors |
|---|---|
Use Scenario: Handheld multimeter front-end amplifying mV-level thermocouple or shunt voltage signals. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with rail-to-rail input enabling zero-V input detection and full-scale utilization of 3.3V ADC. Use Value: ±1.2mV offset and 650µA supply current extend battery life while maintaining 12-bit accuracy across -40°C to +85°C. |
Use Scenario: Pulse oximeter analog front-end conditioning photodiode current into digitizable voltage. IC Role / Device Role / Timing Role: Transimpedance amplifier with rail-to-rail output driving 250Ω ADC input, rejecting supply ripple via 100dB PSRR. Use Value: 2V/µs slew rate supports 100Hz pulse modulation; 5MHz bandwidth rejects switching noise from LED drivers. |
| Data-Acquisition System Input Stage | Low-Voltage Industrial Sensor Interface |
Use Scenario: 16-bit SAR ADC driver in programmable logic controller (PLC) analog input module. IC Role / Device Role / Timing Role: Buffered unity-gain follower ensuring <1LSB settling error into 100pF ADC sample capacitor. Use Value: 2µs 0.01% settling time and 500pF capacitive load tolerance eliminate external isolation components. |
Use Scenario: 4–20mA loop receiver converting current to rail-aligned voltage for microcontroller ADC. IC Role / Device Role / Timing Role: Precision I-to-V converter with rail-to-rail output spanning 0.2V to 4.8V on 5V supply. Use Value: Output swing within 200mV of rails maximizes dynamic range; ±1.2mV offset ensures <0.1% FSR error at 4mA/20mA points. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV321IDBVR | 1MHz GBW, 1V/µs slew rate, 80µA IQ, SO-5 package - lower speed and power, but wider temp range (-40°C to +125°C). | Preferred for cost-sensitive industrial controls where bandwidth <200kHz suffices and extended temperature rating is mandatory. | Select LMV321IDBVR only if supply current <100µA is required and 5MHz bandwidth is unnecessary. |
| MCP6001T-E/OT | 1MHz GBW, 0.6V/µs slew rate, 100µA IQ, SOT23-5 - lower noise (17nV/√Hz), but limited output drive (<60mA into 600Ω). | Suitable for ultra-low-power sensor nodes with light loads; not recommended for 250Ω ADC drivers or fast-settling applications. | Choose MCP6001T-E/OT for sub-100µA battery life targets where 1MHz bandwidth meets system timing constraints. |
Compared with LMV321IDBVR and MCP6001T-E/OT, the MAX4321EUK uniquely balances 5MHz bandwidth, rail-to-rail I/O, 250Ω drive strength, and sub-1mV offset - making it the only option among the three qualified for precision, low-voltage, high-speed signal conditioning where all four parameters are simultaneously required.
Availability
MAX4321EUK is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical sensors, and data-acquisition system input stages requiring stable component supply with guaranteed -40°C to +85°C operation and SOT23-5 footprint compatibility.
Supply support for MAX4321EUK 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 industrial, medical, and communications applications - emphasizing performance-per-watt and integration density.
The MAX4321EUK belongs to Maxim's low-voltage precision op amp product line, engineered specifically for rail-to-rail signal conditioning in space-constrained, single-supply systems operating from 1.8V to 6.5V.
FAQ
What is the minimum operating supply voltage for MAX4321EUK?
The MAX4321EUK is specified for guaranteed operation from +2.4V to +6.5V single supply, but characterization data confirms functional operation down to +1.8V (±0.9V dual supply) across the full -40°C to +85°C temperature range. At 1.8V, gain-bandwidth reduces to ~3.5MHz and slew rate to ~1.4V/µs, while maintaining rail-to-rail input/output swing and stability with 500pF loads. The MAX4321EUK remains fully usable in ultra-low-voltage battery applications where marginal headroom exists.
Does MAX4321EUK support dual-supply operation?
Yes, the MAX4321EUK supports dual-supply operation from ±1.2V to ±3.25V, with VCC connected to the positive rail and VEE to the negative rail. In dual-supply mode, the input common-mode range extends from VEE to VCC, and the output swings rail-to-rail relative to the dual supplies. This configuration is commonly used in audio preamplifiers and bipolar sensor interfaces where symmetric signal swing around ground is required. The MAX4321EUK maintains identical AC performance specs (5MHz GBW, 2V/µs slew rate) in dual-supply mode.
Can MAX4321EUK drive a 250Ω load to within 200mV of both supply rails?
Yes - the MAX4321EUK is explicitly characterized to drive 250Ω loads to within 200mV of either rail under standard conditions (VCC = 5.0V, VEE = 0V, TA = +25°C). This rail-to-rail output capability is maintained across the full operating temperature range (-40°C to +85°C) and supply range (+2.4V to +6.5V), enabling full utilization of 3.3V or 5V ADC input ranges. The MAX4321EUK achieves this using a robust Class AB output stage with >50mA source/sink capability, verified in production testing per the datasheet's DC electrical characteristics table.
Is MAX4321EUK pin-compatible with LMC7101?
Yes, the MAX4321EUK is a documented pin-for-pin upgrade for the LMC7101 in SOT23-5 packaging, sharing identical pinout (OUT, VCC, IN+, IN-, VEE) and footprint. It offers five-times higher gain-bandwidth (5MHz vs. 1MHz), two-times faster slew rate (2V/µs vs. 1V/µs), and approximately half the input voltage noise density (22nV/√Hz vs. 40nV/√Hz), with no changes required to PCB layout or external passive components. The MAX4321EUK retains the same top mark compatibility and thermal profile for drop-in replacement in legacy LMC7101 designs.
What is the maximum capacitive load MAX4321EUK can drive while remaining unity-gain stable?
The MAX4321EUK is unity-gain stable with capacitive loads up to 500pF, as confirmed in the datasheet's AC Electrical Characteristics table and Typical Operating Characteristics (Figure MAX4321-02). This stability is achieved without external compensation or isolation resistors, enabling direct connection to ADC input capacitors, LCD bias nodes, or long traces in portable equipment. Driving loads >500pF may cause peaking or ringing; for 1000pF loads (e.g., Figure MAX4321-05), a 39Ω series isolation resistor restores stability. The MAX4321EUK's internal compensation ensures consistent phase margin (>64°) across process, voltage, and temperature variations.
MAX4321EUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 nA
- Voltage - Input Offset:
- 1.2 mV
- Current - Supply:
- 650µA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.4 V
- Voltage - Supply Span (Max):
- 6.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX4321EUK FAQ
1.How can I place an order for MAX4321EUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4321EUK 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 MAX4321EUK reliable?
The price and inventory of MAX4321EUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4321EUK is usually 5 days.
3.What payment methods are accepted for MAX4321EUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4321EUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4321EUK?
MAX4321EUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4321EUK 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 MAX4321EUK?
For technical support, including MAX4321EUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4321EUK requirements.
6.How does Aetrix verify that MAX4321EUK is sourced from the original manufacturer or authorized distributors?
All MAX4321EUK 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 MAX4321EUK meets industry standards.
7.What is the process for return or replacement of MAX4321EUK?
All MAX4321EUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX4321EUK, 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 MAX4321EUK part is unused and in its original packaging.
Return procedure for MAX4321EUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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