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STMicroelectronics LM324PT
- Part No.:
- LM324PT
- Manufacturer:
- STMicroelectronics
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM324PT.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:9,844
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Product details
Overview
LM324PT from STMicroelectronics is a low-power quad operational amplifier in TSSOP-14 package, designed for single-supply operation from 3 V to 30 V (or ±1.5 V to ±15 V dual supply). It delivers 1.3 MHz gain bandwidth, 100 dB large-signal voltage gain, and rail-to-rail input common-mode range including ground-enabling precision signal conditioning in industrial sensor interfaces and 24 V PLC analog front-ends.
For engineers reviewing the LM324PT datasheet, LM324PT pinout, LM324PT application, or LM324PT equivalent, key selection criteria include its 375 µA/amplifier supply current, 20 nA input bias current, 3 mV max input offset voltage (LM324A-grade), −40 °C to 105 °C operating temperature, and compatibility with cost-sensitive 12-bit ADC driver and comparator hysteresis circuits.
Technical Context
The LM324PT implements internally frequency-compensated, high-gain DC-coupled op-amp stages with PNP input transistors enabling ground-sensing capability. Its input stage supports common-mode voltages from 0 V to VCC − 1.5 V at 25 °C, and output swing reaches within ~20 mV of ground and ~26 V from 30 V supply under 10 kΩ load.
It features independent amplifier channels with no internal crosstalk mitigation beyond layout separation; channel-to-channel isolation exceeds 120 dB at 1 kHz but degrades above 20 kHz due to shared substrate coupling. Thermal resistance is 100 °C/W (junction-to-ambient, TSSOP14), limiting continuous dissipation to ~400 mW at 25 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain bandwidth product | 1.3 MHz - sets usable closed-loop bandwidth for unity-gain stable configurations up to ~1.3 MHz |
| Input offset voltage (max) | 3 mV @ 25 °C - contributes ≤0.3% full-scale error in 1 V reference buffer applications |
| Supply current per amplifier | 375 µA - enables four-channel analog signal conditioning in battery-powered devices drawing <1.5 mA total |
| Input bias current (max) | 100 nA @ 25 °C - allows use with >1 MΩ source impedances without significant DC error |
| Common-mode input range | 0 V to VCC − 1.5 V - supports direct interfacing to 0–5 V sensors without level-shifting circuitry |
| Output voltage swing | 20 mV above ground / 26 V below 30 V supply - sufficient for driving 12-bit SAR ADCs with 0–2.5 V or 0–5 V inputs |
| Slew rate | 0.4 V/µs - limits large-signal settling time to ~12.5 µs for 5 V step, suitable for slow control loops |
Pinout & Package
TSSOP-14 (Thin Shrink Small Outline Package, 4.9 mm × 6.4 mm × 1.05 mm height) with exposed pad not electrically connected; JEDEC MS-012AC compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting input (AMP1) | High-impedance node accepting differential input signals; referenced to non-inverting input (Pin 2) |
| 2 | Non-inverting input (AMP1) | DC-biased reference point; common-mode range extends to ground, enabling single-supply sensor buffering |
| 3 | Output (AMP1) | Class-AB push-pull output capable of sourcing 40 mA / sinking 20 mA; limited by thermal design |
| 4 | VCC− (GND) | Ground reference for all four amplifiers; must be low-impedance path to minimize noise coupling |
| 5 | Inverting input (AMP2) | Independent channel input; shares same process characteristics as Pin 1 but isolated layout |
| 6 | Non-inverting input (AMP2) | Enables dual-channel instrumentation amplifier topologies when paired with external resistors |
| 7 | Output (AMP2) | Electrically isolated output; channel separation >120 dB at 1 kHz prevents cross-talk in multi-channel filters |
| 8 | Output (AMP3) | Third independent output; used for active filtering or reference voltage generation in multi-stage designs |
| 9 | Non-inverting input (AMP3) | Supports DC-coupled summing junctions when tied to virtual ground via feedback network |
| 10 | Inverting input (AMP3) | Accepts inverted signal path in differential receiver configurations with matched external components |
| 11 | VCC+ | Positive supply rail; accepts 3–30 V single supply or +1.5 to +15 V in dual-supply mode |
| 12 | Inverting input (AMP4) | Final channel input; commonly used for comparator hysteresis feedback or LED current regulation |
| 13 | Non-inverting input (AMP4) | Configurable threshold reference; stable down to 0 V enables zero-crossing detection |
| 14 | Output (AMP4) | Drives loads up to 40 mA; often used for open-collector-like digital output via external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | 3 V to 30 V range eliminates need for split supplies in industrial I/O modules and sensor nodes |
| Input common-mode range includes ground | Enables direct connection to 0 V-referenced thermocouples, strain gauges, and current-sense shunts |
| Low input bias current (20 nA typ.) | Permits use with high-value feedback networks (>10 MΩ) without gain drift or offset accumulation |
| Rail-to-rail input capability | Supports full-scale signal acquisition from unipolar sensors without external level-shifting circuitry |
| Enhanced ESD rating (800 V HBM) | Meets IEC 61000-4-2 Level 2 requirements for industrial control panel interfaces |
Applications
| Industrial Sensor Signal Conditioning | PLC Analog Input Module |
|---|---|
Use Scenario: Amplifying low-level outputs from 4–20 mA loop-powered pressure transmitters with 0–5 V output scaling. IC Role / Device Role / Timing Role: Quad op-amp configured as precision I/V converter, filter, buffer, and reference voltage generator in one IC. Use Value: Reduces BOM count by replacing four discrete op-amps; maintains 0.1% linearity over 0–70 °C using LM324A-grade offset specs. |
Use Scenario: Isolating and scaling multiple 0–10 V analog inputs in modular programmable logic controller backplanes. IC Role / Device Role / Timing Role: Four independent channels condition separate sensor inputs with individual gain/offset trimming. Use Value: Enables compact 16-channel analog input card using four LM324PTs; thermal resistance (100 °C/W) supports convection-cooled enclosures. |
| DC Motor Current Monitoring | Low-Power Battery Management |
Use Scenario: Measuring bidirectional motor current via shunt resistor in 24 V brushed DC drive systems. IC Role / Device Role / Timing Role: Differential amplifier (AMP1–AMP2) rejects common-mode noise; comparator (AMP3–AMP4) triggers overcurrent shutdown. Use Value: 20 nA input bias current minimizes shunt measurement error; 375 µA/channel enables always-on monitoring in energy-constrained drives. |
Use Scenario: Monitoring cell voltage and charge/discharge current in 3S Li-ion packs for portable medical devices. IC Role / Device Role / Timing Role: Precision voltage follower (AMP1), current sense amplifier (AMP2), undervoltage lockout comparator (AMP3), and status indicator driver (AMP4). Use Value: 3 V minimum supply allows operation down to end-of-discharge; 100 dB CMRR rejects switching noise from adjacent buck converters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324DT | SO-14 package, higher thermal resistance (103 °C/W), same electrical specs | Better suited for through-hole prototyping or legacy PCBs requiring DIP/SO footprints | Select when board reworkability or hand-soldering is prioritized over space efficiency |
| TSB572IST | 36 V supply range, 0.15 mV max Vio, 1.8 MHz GBP, automotive AEC-Q100 qualified | Required for automotive body electronics or industrial systems needing enhanced accuracy and ESD (1.5 kV CDM) | Choose for new designs demanding tighter offset drift (<1 µV/°C) and extended voltage headroom |
Compared with LM324DT, the LM324PT offers 20% smaller footprint and lower thermal resistance, while TSB572IST provides superior DC precision and automotive qualification at higher cost and power-making LM324PT optimal for cost-sensitive industrial control where SO-14 is impractical and AEC-Q100 is unnecessary.
Availability
LM324PT is available at Aetrix Electronics and suitable for industrial sensor interfaces, PLC analog input modules, and DC motor current monitoring requiring stable component supply across long production lifecycles.
Supply support for LM324PT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in microcontrollers, power management, analog ICs, and MEMS sensors.
The LM324x series belongs to ST's general-purpose analog amplifier portfolio, engineered for robustness and ease of use in industrial automation, building controls, and test equipment where reliability and wide supply range outweigh ultra-low-noise or high-speed requirements.
FAQ
What is the maximum operating temperature for LM324PT?
The LM324PT is rated for operation from 0 °C to 70 °C (commercial grade), matching the LM324x family specification. Its absolute maximum junction temperature is 150 °C, but sustained operation above 70 °C ambient requires derating based on TSSOP14 thermal resistance (100 °C/W) and PCB copper area.
Can LM324PT drive capacitive loads directly?
LM324PT is not unity-gain compensated for heavy capacitive loads; stability issues arise above ~100 pF without series isolation resistor. For driving ADC input capacitors or cables, add a 10–100 Ω resistor between output and load, or use external compensation per Figure 12 in DS0985 Rev 8.
Does LM324PT support rail-to-rail output swing?
No-LM324PT output swings to within ~20 mV of ground and ~26 V below 30 V supply (at 10 kΩ load). It does not reach the positive rail. For true rail-to-rail output, consider ST's TSX564 or TSV914, which specify 50 mV from rails under similar conditions.
Is there a drop-in replacement for LM324PT with improved ESD protection?
LM324WPT (700 V HBM, 1.5 kV CDM) is a direct pin-compatible replacement with enhanced ESD robustness. It shares identical electrical specs and TSSOP-14 packaging but uses modified input protection diodes-ideal for factory-floor environments with frequent handling or unshielded cable connections.
LM324PT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 800 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
LM324PT FAQ
1.How can I place an order for LM324PT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324PT 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 LM324PT reliable?
The price and inventory of LM324PT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324PT is usually 5 days.
3.What payment methods are accepted for LM324PT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324PT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324PT?
LM324PT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324PT 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 LM324PT?
For technical support, including LM324PT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324PT requirements.
6.How does Aetrix verify that LM324PT is sourced from the original manufacturer or authorized distributors?
All LM324PT 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 LM324PT meets industry standards.
7.What is the process for return or replacement of LM324PT?
All LM324PT units undergo pre-shipment inspection (PSI). If there is an issue with LM324PT, 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 LM324PT part is unused and in its original packaging.
Return procedure for LM324PT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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