My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX4321EUK-T
- Part No.:
- MAX4321EUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX4321EUK-T.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,952
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The MAX4321EUK-T 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 input offset voltage (typ), 650µA quiescent current, and full rail-to-rail swing into 250Ω loads - enabling high-fidelity amplification in battery-powered data-acquisition front-ends.
For engineers reviewing the MAX4321EUK-T datasheet, MAX4321EUK-T pinout, MAX4321EUK-T application, or MAX4321EUK-T equivalent, key selection criteria include its guaranteed +2.4V to +6.5V single-supply operation, unity-gain stability with up to 500pF capacitive loads, no phase reversal on overdriven inputs, and SOT23-5 footprint compatibility with legacy LMC7101 designs.
Technical Context
The MAX4321EUK-T employs a dual-input-stage architecture-comprising complementary NPN and PNP differential pairs-to achieve true rail-to-rail common-mode input range (VEE to VCC) without phase reversal. Its output stage uses a Class AB topology capable of sourcing/sinking >50mA to drive 250Ω loads within 200mV of either rail.
Internally compensated for unity-gain stability, the device maintains 64° phase margin and 12dB gain margin while delivering 0.003% THD+N at 10kHz and 2Vpp output. Input noise density is 22nV/√Hz at 1kHz, and input capacitance is 3pF - supporting stable high-impedance sensor interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 5MHz - supports closed-loop bandwidth up to ~4.8MHz at AV = +1, suitable for anti-aliasing and active filtering. |
| Slew rate | 2V/µs - enables clean 10kHz sine-wave amplification at 2Vpp without distortion in low-power systems. |
| Input offset voltage | ±1.2mV (typ) - ensures ≤0.024% gain error in 12-bit ADC front-ends with 5V full-scale reference. |
| Quiescent current | 650µA (typ at +5V) - allows continuous operation for >1 year on a 200mAh coin cell in portable instrumentation. |
| Rail-to-rail I/O | Input CM range: VEE to VCC; Output swing: within 200mV of rails into 250Ω - maximizes dynamic range in 1.8–6.5V single-supply rails. |
| Capacitive load drive | Stable with ≤500pF - eliminates need for isolation resistors in ADC buffer or DAC output stages. |
| Supply range | +2.4V to +6.5V (single); ±1.2V to ±3.25V (dual) - interoperable with Li-ion, 3.3V, and 5V logic domains. |
Pinout & Package
MAX4321EUK-T is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and exposed pad not present. Pin 1 is marked by a dot or beveled edge.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Class AB rail-to-rail driver capable of sourcing/sinking >50mA; connects directly to ADC input or transducer load. |
| 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− reduces bias-current-induced offset. |
| 4 (IN−) | Inverting input | Differential pair input; polarity-sensitive in active-filter configurations; protected by 1kΩ series resistors. |
| 5 (VEE) | Negative supply | Ground reference for single-supply use; must be tied to system GND - not left floating. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends from VEE to VCC - enables direct sensing of signals near supply rails (e.g., battery voltage monitoring at 0.1V above GND). |
| No phase reversal on overdrive | Prevents latch-up or erroneous output during transient input excursions beyond rails - critical for sensor fault tolerance. |
| Unity-gain stable with 500pF load | Eliminates external compensation components when buffering SAR ADCs or driving long PCB traces. |
| Low input voltage noise density | 22nV/√Hz at 1kHz - preserves SNR in low-level thermocouple or bridge-sensor amplification chains. |
| Pin-for-pin upgrade for LMC7101 | Direct drop-in replacement with 5× higher bandwidth and 2× faster slew rate - accelerates design reuse without layout change. |
Applications
| Battery-Powered Instrumentation | Data-Acquisition Front-End |
|---|---|
Use Scenario: Portable multimeter measuring 0–3.3V sensor outputs with 12-bit resolution under 3.3V single supply. IC Role / Device Role / Timing Role: Precision noninverting amplifier with gain = 1, buffering high-impedance probe signal before ADC sampling. Use Value: Rail-to-rail I/O preserves full 3.3V dynamic range; 650µA ICC extends battery life beyond 24 months on 250mAh cell. | Use Scenario: Industrial temperature monitor using RTD sensor with 4-wire Kelvin connection and 24-bit ΣΔ ADC. IC Role / Device Role / Timing Role: Low-noise, low-offset instrumentation amplifier first stage (G = 100) with matched input impedances. Use Value: ±1.2mV VOS contributes <0.04°C error at 100°C; 22nV/√Hz noise avoids degrading effective resolution below 22 bits. |
| Sensor Signal Conditioning | Low-Voltage Portable Equipment |
Use Scenario: Wearable heart-rate monitor amplifying 100µV ECG signals referenced to body potential. IC Role / Device Role / Timing Role: AC-coupled, high-pass filtered gain stage with DC bias restoration via rail-to-rail output swing. Use Value: No phase reversal prevents output saturation during electrode pop transients; 3pF CIN minimizes high-frequency noise pickup. | Use Scenario: Bluetooth audio headset with MEMS microphone preamplifier operating from 1.8V coin cell. IC Role / Device Role / Timing Role: Single-supply microphone bias and amplification stage with gain = 20 and 20kHz bandwidth. Use Value: Operates down to +1.8V (±0.9V) - matches lowest practical battery voltage; 2V/µs SR supports clean 20kHz audio reproduction. |
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 |
|---|---|---|---|
| LMC7101M5X | 1MHz GBW, 0.6V/µs SR, ±2.5mV VOS (max), same SOT23-5 pinout | Limited to lower-bandwidth sensor buffers; unsuitable for >10kHz signal paths | Select only when cost sensitivity outweighs speed/accuracy needs and layout reuse is mandatory. |
| MCP6001T-E/OT | 1MHz GBW, 0.6V/µs SR, 1.5mV VOS (max), same 5-pin SOT23 but different pin mapping (OUT=6, VDD=5, etc.) | Requires PCB redesign due to non-pin-compatible pinout; lacks 500pF capacitive load stability | Consider only for new designs where Microchip's AEC-Q200 qualification or extended temp range (+125°C) is required. |
Compared with LMC7101M5X and MCP6001T-E/OT, the MAX4321EUK-T provides superior bandwidth, slew rate, and capacitive-load robustness in identical SOT23-5 packaging - making it the optimal choice for time-critical, low-voltage precision analog signal chains where layout continuity and performance headroom are essential.
Availability
MAX4321EUK-T is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, industrial data-acquisition modules, and low-voltage sensor interface circuits requiring stable component supply across extended temperature ranges (-40°C to +85°C).
Supply support for MAX4321EUK-T 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 MAX4321EUK-T belongs to Maxim's precision rail-to-rail op amp product line, engineered specifically for low-voltage, single-supply signal-conditioning tasks in space-constrained portable and battery-operated systems.
FAQ
What is the minimum operating supply voltage for MAX4321EUK-T?
The MAX4321EUK-T is guaranteed to operate from +2.4V to +6.5V on single supply, but characterization data shows functional operation down to +1.8V (±0.9V) across the -40°C to +85°C range. This makes MAX4321EUK-T viable for deep-discharge battery scenarios where voltage sags below 2.4V, though parameters like GBW and SR scale linearly with supply.
Does MAX4321EUK-T require external compensation for unity-gain stability?
No, the MAX4321EUK-T is internally compensated and remains unity-gain stable with capacitive loads up to 500pF. Unlike many high-speed op amps, it does not require an external isolation resistor or feedback capacitor to maintain phase margin - simplifying layout and reducing BOM count in ADC buffer or filter applications.
Can MAX4321EUK-T drive a 250Ω load to both supply rails?
Yes, the MAX4321EUK-T drives 250Ω loads to within 200mV of either rail under typical conditions. At VCC = +5V and RL = 250Ω to ground, VOH ≥ 4.8V and VOL ≤ 200mV are specified - confirming rail-to-rail output capability even under moderate load, which is essential for maximizing ADC utilization in low-voltage systems.
Is MAX4321EUK-T pin-compatible with LMC7101?
Yes, MAX4321EUK-T is explicitly designed as a pin-for-pin upgrade for LMC7101 in SOT23-5 packaging. Pin functions (OUT, VCC, IN+, IN−, VEE) match identically, allowing direct replacement without PCB modification - while delivering five-times higher bandwidth and two-times faster slew rate.
What is the input protection scheme used in MAX4321EUK-T?
The MAX4321EUK-T incorporates 1kΩ series resistors on both inputs plus back-to-back triple diodes across IN+ and IN−. For differential voltages <1.8V, input resistance is ~500kΩ; above 1.8V, it drops to ~2kΩ, limiting input current per the equation IBIAS = (VDIFF − 1.8V)/2kΩ - protecting against ESD and overvoltage events without compromising normal operation.
MAX4321EUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- 725µA
- 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-T FAQ
1.How can I place an order for MAX4321EUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4321EUK-T 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-T reliable?
The price and inventory of MAX4321EUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4321EUK-T is usually 5 days.
3.What payment methods are accepted for MAX4321EUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4321EUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4321EUK-T?
MAX4321EUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4321EUK-T 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-T?
For technical support, including MAX4321EUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4321EUK-T requirements.
6.How does Aetrix verify that MAX4321EUK-T is sourced from the original manufacturer or authorized distributors?
All MAX4321EUK-T 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-T meets industry standards.
7.What is the process for return or replacement of MAX4321EUK-T?
All MAX4321EUK-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4321EUK-T, 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-T part is unused and in its original packaging.
Return procedure for MAX4321EUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX4321EUK-T Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
