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Texas Instruments LP324D
- Part No.:
- LP324D
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LP324D.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,274
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Product details
Overview
LP324D from Texas Instruments is a quadruple ultra-low-power operational amplifier optimized for battery-operated systems, featuring 85 μA typical supply current, 2 mV typical input offset voltage, and rail-to-rail input common-mode range extending to ground. It operates from 3 V to 32 V single supply and is widely deployed in portable instrumentation and LCD display biasing circuits.
For engineers reviewing the LP324D datasheet, LP324D pinout, LP324D application, or LP324D equivalent, key selection criteria include ultra-low quiescent current, ground-sensing input capability, wide supply voltage tolerance, and compatibility with legacy LM324-based designs where power efficiency and temperature stability over 0°C to 70°C are critical.
Technical Context
The LP324D implements a bipolar-input op-amp architecture delivering high open-loop gain (50–100 V/mV) and 100 kHz gain-bandwidth product while maintaining 2 nA typical input bias current and 85 μA supply current per amplifier. Its input stage supports single-supply operation with common-mode voltage down to ground, enabling direct sensor interfacing without level-shifting.
Thermal performance is characterized by 140 °C/W junction-to-ambient resistance in the SOIC-14 package, and electrical behavior is specified across 0°C to 70°C ambient - distinct from the wider −40°C to +85°C range of the LP2902 variant. Absolute maximum ratings include ±16 V dual-supply or 32 V single-supply operation and ±350 V HBM ESD rating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply current | 85 μA typical per amplifier - enables multi-year battery life in always-on portable sensors and meters. |
| Input offset voltage | 2 mV typical at 25°C - ensures <1% error in 12-bit precision signal conditioning without trimming. |
| Input bias current | 2 nA typical - minimizes voltage drop across high-impedance sources like photodiodes or pH electrodes. |
| Common-mode input range | Includes ground (0 V) - allows direct interface to single-supply sensors and microcontroller ADC references. |
| Supply voltage range | 3 V to 32 V single supply - supports operation from coin cells to industrial 24 V rails without external regulators. |
| Gain-bandwidth product | 100 kHz - sufficient for DC-coupled amplification, filtering, and comparator functions in low-speed analog front-ends. |
| Output swing (sinking) | Within 1 V of ground at 350 μA load - maintains usable dynamic range near rail in single-supply configurations. |
Pinout & Package
LP324D is housed in a 14-pin SOIC (D) package, 8.75 mm × 4.0 mm footprint, 1.75 mm max height, with gull-wing leads and RoHS-compliant NiPdAu lead finish. Pin 1 is located at the top-left corner with notch or dot marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Output (1OUT, 2OUT, 3OUT, 4OUT) | Amplifier output stages capable of sourcing/sinking ≥4 mA - drives LEDs, reference buffers, or ADC input networks. |
| 2, 6, 9, 13 | Inverting input (1IN−, 2IN−, 3IN−, 4IN−) | Differential input node with 2 nA bias current - used for feedback configuration and active filtering. |
| 3, 5, 10, 12 | Non-inverting input (1IN+, 2IN+, 3IN+, 4IN+) | High-impedance input accepting signals down to ground - enables unity-gain followers and sensor buffering. |
| 4 | VCC+ | Positive supply rail connection - accepts up to 32 V; decoupling capacitor required within 10 mm for stability. |
| 11 | VCC− | Negative supply or ground reference - must be connected even in single-supply mode to establish bias point. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low quiescent current | 85 μA per amplifier - reduces system-level standby power by >90% versus standard LM324 (1.5 mA). |
| Ground-sensing input | Input common-mode range includes 0 V - eliminates need for negative supply or level-shifting circuitry in single-rail systems. |
| Wide supply voltage range | 3 V to 32 V single supply - supports direct integration into both low-voltage wearables and industrial 24 V control modules. |
| Pin-compatible with LM324 | Identical SOIC-14 pinout and function mapping - enables drop-in replacement in existing LM324 layouts without PCB revision. |
| Low input offset drift | 10 μV/°C - maintains calibration integrity across 0°C to 70°C operating range without active compensation. |
Applications
| Portable Instrumentation | LCD Display Biasing |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter measuring DC voltage, current, and resistance. IC Role / Device Role / Timing Role: LP324D serves as input buffer, auto-zero amplifier, and reference voltage follower in analog front-end. Use Value: 85 μA supply current extends battery life to >2 years on two AA cells; ground-sensing inputs enable direct connection to shunt resistors and DMM input jacks. |
Use Scenario: Driving segment voltage bias in monochrome STN LCD panels for medical devices and industrial HMIs. IC Role / Device Role / Timing Role: LP324D configures as precision voltage divider and buffer to generate stable VCOM and segment drive references. Use Value: 2 mV offset ensures <±0.5% contrast uniformity across display segments; 32 V max supply accommodates high-VLCD requirements. |
| Consumer Audio Accessories | Industrial Power Supply Monitoring |
|
Use Scenario: Signal conditioning and volume control in USB-powered Bluetooth speaker docking stations. IC Role / Device Role / Timing Role: LP324D implements active low-pass filter and line-driver amplifier for DAC output stage. Use Value: 100 kHz GBW preserves audio fidelity up to 20 kHz; low noise floor (not specified but consistent with 2 nA IIB) avoids audible hiss in headphone outputs. |
Use Scenario: Real-time monitoring of 12 V and 24 V DC rails in programmable logic controller (PLC) backplanes. IC Role / Device Role / Timing Role: LP324D acts as rail-to-rail comparator and voltage monitor with hysteresis for overvoltage/undervoltage detection. Use Value: 32 V absolute max rating allows direct sensing of 24 V systems; 4 mA output sink capability drives optocoupler inputs without external transistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DR | Higher 1.5 mA supply current; wider −40°C to +85°C temp range; same SOIC-14 pinout. | Better suited for automotive under-hood or industrial environments requiring extended temperature operation. | Select LM324DR only when thermal robustness outweighs battery-life impact - not recommended for portable equipment. |
| LP2902DR | Same ultra-low 85 μA current; rated for −40°C to +85°C; identical electrical specs except wider temp range. | Enables drop-in upgrade in LP324D designs needing extended temperature qualification without layout change. | Choose LP2902DR when operating ambient exceeds 70°C - no design modification required beyond requalification. |
Compared with LM324DR, LP324D delivers >94% lower supply current at the cost of reduced temperature range; compared with LP2902DR, it shares identical low-power performance but trades 15°C of upper-temperature margin for cost optimization in commercial-grade applications.
Availability
LP324D is available at Aetrix Electronics and suitable for portable instrumentation, LCD display biasing, consumer audio accessories, industrial power supply monitoring, and battery management systems requiring stable component supply across long production lifecycles.
Supply support for LP324D 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies, with over 90 years of innovation in precision analog ICs.
The LP324D belongs to TI's ultra-low-power operational amplifier product line, engineered specifically for energy-constrained, single-supply applications where minimizing quiescent current without sacrificing input accuracy is paramount.
FAQ
What is the operating temperature range for the LP324D?
The LP324D is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range distinguishes it from the LP2902DR, which supports −40°C to +85°C. The LP324D datasheet confirms these limits in Section 5.3 Recommended Operating Conditions, and thermal derating is required above 70°C to maintain reliability.
Is the LP324D pin-compatible with the LM324?
Yes, the LP324D is fully pin-compatible with the LM324 in the SOIC-14 package. Pin functions - including all four amplifier inputs, outputs, and dual supply terminals - match identically. This allows direct substitution in existing LM324 layouts without PCB modification, though users must verify that the LP324D's lower supply current and narrower temperature range meet system requirements.
What is the maximum supply voltage the LP324D can handle?
The LP324D supports a maximum single-supply voltage of 32 V, or ±16 V in dual-supply configuration, as defined in Section 5.1 Absolute Maximum Ratings. Exceeding 32 V risks permanent damage. For reliable operation, TI recommends staying within 3 V to 32 V per Section 5.3, with proper decoupling at VCC+ and grounding of VCC− even in single-supply use.
Does the LP324D support rail-to-rail input or output?
The LP324D supports rail-to-rail input common-mode range - specifically, it includes ground (0 V) and extends up to VCC − 1.5 V. However, its output swing is not rail-to-rail: typical low-side swing is within 1 V of ground and high-side swing within 1.9 V of VCC at 350 μA load. Full rail-to-rail output requires alternative op-amps such as the TLV2464.
Can the LP324D replace the LP2902 in an existing design?
The LP324D can replace the LP2902 in designs operating strictly within 0°C to +70°C ambient, as both share identical electrical specifications, pinout, and package options. However, the LP2902 supports −40°C to +85°C, so substituting LP324D in wider-temperature applications may cause functional failure outside its rated range. Always validate thermal margins before interchange.
LP324D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- 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:
- -
- Slew Rate:
- 0.05V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 85µA (x4 Channels)
- Current - Output / Channel:
- 10 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
LP324D FAQ
1.How can I place an order for LP324D through Aetrix?
Please submit a Request for Quotation (RFQ) for LP324D 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 LP324D reliable?
The price and inventory of LP324D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LP324D is usually 5 days.
3.What payment methods are accepted for LP324D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LP324D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LP324D?
LP324D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LP324D 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 LP324D?
For technical support, including LP324D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LP324D requirements.
6.How does Aetrix verify that LP324D is sourced from the original manufacturer or authorized distributors?
All LP324D 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 LP324D meets industry standards.
7.What is the process for return or replacement of LP324D?
All LP324D units undergo pre-shipment inspection (PSI). If there is an issue with LP324D, 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 LP324D part is unused and in its original packaging.
Return procedure for LP324D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LP324D 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
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