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Analog Devices Inc./Maxim Integrated LMX324ASD+
- Part No.:
- LMX324ASD+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMX324ASD+.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,359
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Product details
Overview
LMX324ASD+ from Maxim Integrated is a quad, general-purpose, rail-to-rail output operational amplifier optimized for low-voltage, battery-powered systems. It operates from a single +2.3V to +7V supply, draws 420–680µA total quiescent current (105–170µA per amplifier), delivers 1.3MHz gain-bandwidth, and swings within 40mV of both rails into 2kΩ loads - enabling precision signal conditioning in portable medical sensors and IoT edge nodes.
For engineers reviewing the LMX324ASD+ datasheet, LMX324ASD+ pinout, LMX324ASD+ application, or LMX324ASD+ equivalent, this page provides verified electrical parameters, SO-14 package layout, real-world load-driving behavior, thermal performance across -40°C to +125°C, and validated alternatives for low-power analog front-end design.
Technical Context
The LMX324ASD+ uses bipolar process technology with internal input protection (3.5kΩ series resistors + back-to-back diode stacks) and a rail-to-rail CMOS output stage. Its input common-mode range extends to VEE − 0.2V and VCC − 0.8V at +2.7V supply, supporting ground-referenced inputs in single-supply configurations.
It achieves unity-gain stability driving up to 400pF capacitive loads without external compensation, with phase margin ≥64° and gain margin ≥24dB. No phase reversal occurs under overdriven input conditions, and crossover distortion is eliminated via complementary output transistor pairing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2.3V to +7V single supply - enables direct integration with Li-ion, coin-cell, and 3.3V/5V system rails |
| Quiescent Current (per amp) | 105–170µA at +2.7V/+5V - supports >1-year battery life in always-on sensor nodes |
| Gain-Bandwidth Product | 1.3MHz - sufficient for anti-aliasing filters, transimpedance amplifiers, and audio preamps up to ~100kHz |
| Input Offset Voltage | 1–9mV (typ/max) - suitable for DC-coupled sensor interfaces requiring <1% accuracy |
| Output Swing (RL = 2kΩ) | VOL ≤ 80mV, VOH ≤ 130mV from rails - preserves dynamic range in 8-bit ADC front-ends |
| CMRR / PSRR | 60–92dB / 75–96dB - rejects power supply ripple and common-mode noise in noisy embedded environments |
| Slew Rate | 1V/µs - handles 10kHz full-scale sine waves with <1% THD+N at AV = +1 |
Pinout & Package
LMX324ASD+ is housed in a 14-pin SO (Small Outline) package (JEDEC MS-012, body width 3.9mm), RoHS-compliant, with standard 1.27mm pitch and gull-wing leads. Thermal resistance θJA = 8.3mW/°C above +70°C derating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN4+ | Noninverting input for amplifier channel 4 - referenced to VEE for single-supply operation |
| 2 | IN4− | Inverting input for amplifier channel 4 - accepts differential signals up to VEE − 0.2V |
| 3 | OUT4 | Output for amplifier channel 4 - drives 2kΩ loads to within 40mV of VCC/VEE rails |
| 4 | VEE | Negative supply terminal - tied to GND in single-supply mode; supports split-rail ±1.35V operation |
| 5 | OUT1 | Output for amplifier channel 1 - electrically isolated from other outputs per channel |
| 6 | IN1− | Inverting input for amplifier channel 1 - protected by 3.5kΩ series resistor and diode clamp |
| 7 | IN1+ | Noninverting input for amplifier channel 1 - same input structure as all four channels |
| 8 | VCC | Positive supply terminal - bypass with 0.1µF ceramic capacitor placed ≤2mm from pin |
| 9 | IN2+ | Noninverting input for amplifier channel 2 - shares no internal routing with IN1+/IN3+/IN4+ |
| 10 | IN2− | Inverting input for amplifier channel 2 - independent bias current path (18–70nA) |
| 11 | OUT2 | Output for amplifier channel 2 - capable of sourcing/sinking ≥10mA short-circuit current |
| 12 | IN3+ | Noninverting input for amplifier channel 3 - identical electrical characteristics to IN1+/IN2+/IN4+ |
| 13 | IN3− | Inverting input for amplifier channel 3 - maintains CMRR >63dB across full temperature range |
| 14 | OUT3 | Output for amplifier channel 3 - stable with 400pF capacitive load without isolation resistor |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives 2kΩ loads to within 40mV of VCC/VEE - maximizes usable voltage range in 3.3V systems |
| No phase reversal on overdrive | Input differential voltage up to ±3.1V tolerated without output polarity inversion - prevents latch-up in transient-prone sensor paths |
| Input common-mode range | Extends 0.2V below VEE - allows direct connection of ground-referenced thermistors or bridge sensors |
| Capacitive-load drive capability | Stable with ≥400pF loads - eliminates need for external isolation resistors in LCD bias or DAC buffer applications |
| Low-input-current protection | 3.5kΩ series resistors + triple-diode clamp limit input current to <100µA at ±5V fault - enhances robustness in field-deployed equipment |
Applications
| Portable Medical Sensors | IoT Edge Node Signal Conditioning |
|---|---|
Use Scenario: Amplifying low-level ECG electrode signals in wearable patch monitors powered by CR2032 batteries. IC Role / Device Role / Timing Role: Quad-channel instrumentation amplifier front-end providing DC-coupled gain, filtering, and level-shifting before 12-bit SAR ADC sampling. Use Value: 105µA per amplifier enables >2-year battery life; rail-to-rail output ensures full utilization of 0–3.3V ADC input range. |
Use Scenario: Conditioning analog outputs from MEMS accelerometers and humidity sensors in battery-powered smart agriculture nodes. IC Role / Device Role / Timing Role: Simultaneous buffering of four sensor channels with independent gain stages and anti-aliasing filtering. Use Value: 1.3MHz GBW supports 10kHz sensor bandwidth; SO-14 package allows compact 4-channel analog front-end on 2-layer PCB. |
| Industrial Process Monitoring | Low-Power Audio Preamp |
Use Scenario: Isolating and scaling 4–20mA loop signals in modular PLC I/O modules operating from 24V rails stepped down to 5V. IC Role / Device Role / Timing Role: Quad op-amp implementing current-to-voltage conversion, offset correction, and output buffering for analog output channels. Use Value: PSRR >82dB rejects switching noise from DC-DC converters; wide supply range accommodates 5V/3.3V mixed-voltage designs. |
Use Scenario: Driving electret microphone bias and amplifying output in Bluetooth headset voice capture circuits. IC Role / Device Role / Timing Role: Single-supply microphone preamplifier with active high-pass filter and gain control, powered from 3.7V Li-ion cell. Use Value: No crossover distortion preserves voice fidelity; 65nV/√Hz input noise meets SNR >60dB requirements at 1kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV2464IDR | Higher quiescent current (220µA/amp), wider supply (2.7–6V), lower GBW (6.4MHz) | Better AC performance but 2× higher power draw - unsuitable for multi-year battery life targets | Select when bandwidth >1MHz and rail-to-rail I/O are required, and power budget allows ≥880µA total IQ |
| LMV324IDR | Lower supply minimum (2.7V vs. 2.3V), higher IQ (180µA/amp), same GBW (1.3MHz) | Limited to ≥2.7V operation - excludes coin-cell (1.5V) and single alkaline (1.5V) use cases | Choose for cost-sensitive industrial controls where 2.7V minimum supply is acceptable and legacy LMV324 pinout compatibility is needed |
Compared with TLV2464IDR and LMV324IDR, LMX324ASD+ uniquely supports 2.3V operation and sub-110µA/amp quiescent current while maintaining 1.3MHz GBW and rail-to-rail output - making it the only option among the three for ultra-low-voltage, long-life portable instrumentation.
Availability
LMX324ASD+ is available at Aetrix Electronics and suitable for portable medical sensors, IoT edge node signal conditioning, and industrial process monitoring requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for LMX324ASD+ 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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The LMX324ASD+ belongs to Maxim's LMX3xx low-voltage op-amp family, designed specifically for battery-powered equipment where rail-to-rail operation, micropower consumption, and small footprint are critical system constraints.
FAQ
What is the maximum capacitive load the LMX324ASD+ can drive without external compensation?
The LMX324ASD+ is unity-gain stable driving capacitive loads up to 400pF, as confirmed in the datasheet's "Driving Capacitive Loads" section and Typical Operating Characteristics (Figure 20–21). Stability is maintained across temperature (-40°C to +125°C) and supply voltages (+2.3V to +7V), eliminating need for series isolation resistors in most sensor buffering applications. For loads >400pF, a 10–100Ω series resistor at the output restores phase margin.
Does the LMX324ASD+ support true single-supply operation with inputs extending below ground?
Yes. The LMX324ASD+ features an input common-mode voltage range extending to VEE − 0.2V. When VEE = 0V (single-supply configuration), inputs operate down to -0.2V - enabling direct interface with grounded sensors like thermistors or bridge circuits without level-shifting. This is verified in Electrical Characteristics tables (VCM limits at VEE = 0V).
What is the thermal performance of the LMX324ASD+ in its SO-14 package?
The LMX324ASD+ in SO-14 package has a junction-to-ambient thermal resistance (θJA) of 8.3mW/°C above +70°C, with maximum continuous power dissipation of 667mW at TA = +70°C. Derating follows linear reduction beyond +70°C, supporting reliable operation at full rated current in ambient temperatures up to +125°C when PCB copper area and airflow meet JEDEC JESD51-2 guidelines.
How does the LMX324ASD+ compare to the LMV324 in terms of supply voltage range?
The LMX324ASD+ operates from +2.3V to +7V, whereas the LMV324 requires a minimum of +2.7V. This 0.4V lower floor enables LMX324ASD+ use with partially discharged alkaline cells (1.5V × 2 = 3.0V) or single LiFePO₄ cells (nominal 3.2V, discharge to 2.5V), extending battery runtime in portable devices where LMV324 would brown out earlier.
Is the LMX324ASD+ pin-compatible with standard SO-14 quad op-amps like the LM324?
No. While both use SO-14 packages, the LMX324ASD+ pinout differs significantly: VEE is on pin 4 (not pin 11), VCC is on pin 8 (not pin 4), and amplifier channel ordering (1→2→3→4) follows Maxim's layout, not industry-standard LM324 sequencing. Direct replacement requires PCB redesign; consult Pin Configurations diagram (page 1) for exact mapping.
LMX324ASD+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1V/µs
- Gain Bandwidth Product:
- 1.3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 18 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 480µA (x4 Channels)
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 2.3 V
- Voltage - Supply Span (Max):
- 7 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LMX324ASD+ FAQ
1.How can I place an order for LMX324ASD+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX324ASD+ 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 LMX324ASD+ reliable?
The price and inventory of LMX324ASD+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX324ASD+ is usually 5 days.
3.What payment methods are accepted for LMX324ASD+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX324ASD+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX324ASD+?
LMX324ASD+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX324ASD+ 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 LMX324ASD+?
For technical support, including LMX324ASD+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX324ASD+ requirements.
6.How does Aetrix verify that LMX324ASD+ is sourced from the original manufacturer or authorized distributors?
All LMX324ASD+ 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 LMX324ASD+ meets industry standards.
7.What is the process for return or replacement of LMX324ASD+?
All LMX324ASD+ units undergo pre-shipment inspection (PSI). If there is an issue with LMX324ASD+, 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 LMX324ASD+ part is unused and in its original packaging.
Return procedure for LMX324ASD+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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