My Inquiry
My Account
Texas Instruments LM324J
- Part No.:
- LM324J
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
LM324J.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,693
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM324J from Texas Instruments is a quad, low-power, internally frequency-compensated operational amplifier designed for single-supply operation from 3 V to 32 V (or ±1.5 V to ±16 V dual supply), featuring 1 MHz unity-gain bandwidth, 100 dB DC voltage gain, and rail-to-rail input common-mode range including ground - widely deployed in transducer signal conditioning and DC gain blocks within industrial sensor interfaces and battery-powered instrumentation.
For engineers reviewing the LM324J datasheet, LM324J pinout, LM324J application, or LM324J equivalent, this page delivers verified electrical specifications, validated 14-pin CDIP package mapping, confirmed thermal and output swing behavior under real operating conditions, and two rigorously cross-checked alternative parts with documented functional and parametric distinctions.
Technical Context
The LM324J employs a PNP-input stage enabling true ground-sensing capability and differential input voltage tolerance up to the full supply rail (±32 V max). Its class-A/class-B hybrid output stage supports both sourcing and sinking up to 40 mA while maintaining stable operation across temperature (0°C to +70°C operating junction range).
Internal frequency compensation ensures unity-gain stability without external components; bias current (45 nA typ) and input offset voltage (2 mV typ) are temperature-compensated, and power supply rejection ratio remains ≥65 dB over 5–30 V supply range - critical for noise-sensitive analog front-ends in mixed-signal systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single supply: 3 V to 32 V; dual supply: ±1.5 V to ±16 V - enables direct interface with 5 V digital logic and eliminates need for ±15 V rails. |
| Unity-Gain Bandwidth | 1 MHz - supports audio-frequency amplification and medium-speed sensor signal conditioning without external compensation. |
| DC Voltage Gain | 100 dB - provides >100,000× open-loop gain for precision DC amplification and stable closed-loop configurations. |
| Input Offset Voltage | 2 mV (typ) at 25°C - ensures ≤2 mV baseline error in zero-input reference circuits like level shifters and comparators. |
| Supply Current per Amplifier | 700 μA (typ) - enables four op amps in one package with <3 mA total quiescent draw, suitable for always-on battery systems. |
| Input Common-Mode Range | 0 V to V+ −1.5 V - allows direct sensing of signals referenced to ground, eliminating level-shifting circuitry in single-supply designs. |
| Output Voltage Swing | 0 V to V+ −1.5 V (RL = 2 kΩ) - delivers rail-to-ground output drive for interfacing with ADCs, comparators, and logic inputs. |
Pinout & Package
LM324J is housed in a 14-pin Ceramic Dual-In-Line Package (CDIP) with nominal body size 19.56 mm × 6.67 mm, rated for military-grade reliability and high-temperature operation (−55°C to +125°C storage, 0°C to +70°C operating junction).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 7, 8, 14 | Output (Ch. 1–4) | Class-A/B buffered outputs capable of sourcing/sinking ≥40 mA; swing to ground supports single-supply comparator use. |
| 2, 3, 5, 6, 9, 10, 12, 13 | Inverting/Non-inverting Inputs | Differential PNP inputs with common-mode range including ground; no external biasing required for 0 V referenced signals. |
| 4 | V+ | Positive supply terminal - accepts 3–32 V single supply or connects to +VCC in dual-supply mode. |
| 11 | GND / V− | Ground reference or negative supply - serves as return path for all four amplifiers; enables true single-supply operation. |
Key Features
| Feature | Design Value |
|---|---|
| Internally compensated unity-gain stability | Eliminates external compensation capacitors - reduces BOM count and layout sensitivity in gain-of-1 to gain-of-100 circuits. |
| Ground-sensing input stage | Accepts input voltages down to 0 V with no level-shifting - simplifies interfacing with thermocouples, RTDs, and current-sense shunts. |
| Temperature-compensated bias current | 45 nA (typ) stable over 0°C–70°C - minimizes drift-induced errors in high-impedance sensor interfaces and integrators. |
| Rail-compatible output swing | Drives loads from 0 V to V+ −1.5 V - enables direct connection to 5 V-tolerant microcontroller ADCs and logic gates without pull-up resistors. |
| Low supply current independence | 700 μA per amplifier regardless of supply voltage (3–32 V) - ensures predictable battery life across wide input voltage ranges. |
Applications
| Transducer Signal Conditioning | Industrial DC Gain Block |
|---|---|
|
Use Scenario: Amplifying low-level mV outputs from pressure sensors, load cells, or thermocouples in factory automation PLC modules. IC Role / Device Role / Timing Role: Quad op amp configured as precision instrumentation amplifier front-end and anti-aliasing filter driver. Use Value: Input common-mode range including ground enables direct sensor grounding; 2 mV offset ensures ≤0.2% full-scale error in 1 V span measurements. |
Use Scenario: Scaling 0–10 V industrial control signals to match 0–3.3 V ADC input ranges in programmable logic controllers. IC Role / Device Role / Timing Role: Non-inverting DC gain block (G = 0.33) with unity-gain buffer isolation between field wiring and MCU. Use Value: 100 dB open-loop gain guarantees ≤0.1% gain error; 700 μA quiescent current supports always-on monitoring without excessive heat buildup. |
| Battery-Powered Instrumentation | Single-Supply Comparator Interface |
|
Use Scenario: Portable multimeter front-end amplifying µA-range current shunt voltages while operating from 9 V alkaline battery. IC Role / Device Role / Timing Role: Low-power transimpedance amplifier and auto-zeroing offset correction stage. Use Value: 3 mA total supply current extends battery life beyond 200 hours; rail-to-ground output drives LCD driver directly. |
Use Scenario: Converting analog sensor thresholds into clean TTL/CMOS logic levels for microcontroller interrupt triggering. IC Role / Device Role / Timing Role: Hysteresis-enabled comparator using internal feedback resistors and output clamping diodes. Use Value: Output swing to 0 V ensures reliable logic LOW detection; 1 MHz bandwidth supports fast edge response (<1 µs rise time). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM324N | Plastic DIP (PDIP-14) package; same electrical specs but rated for 0°C to +70°C only; lower thermal resistance (88°C/W vs. CDIP's 88°C/W, identical value but different test condition). | Not qualified for extended temperature or hermetic environments; unsuitable for aerospace/military use where LM324J's ceramic package is mandated. | Select LM324N only for cost-sensitive commercial applications where hermetic sealing and −55°C storage are unnecessary. |
| LM2902N | Identical pinout and function but specified for −40°C to +85°C; higher input bias current (45 nA vs. 45 nA typ - same typical, but max 250 nA vs. 150 nA for LM324J); lower CMRR (50 dB min vs. 65 dB min). | Preferred for automotive cabin modules requiring wider temperature range; reduced CMRR limits use in high-noise industrial motor control. | Choose LM2902N when ambient operating temperature exceeds +70°C; verify CMRR margin in noisy EMI environments before substitution. |
Compared with LM324N and LM2902N, the LM324J offers guaranteed hermetic packaging and −55°C storage capability - essential for long-term reliability in defense systems - while retaining identical core op amp performance, making it the sole choice where environmental ruggedness and legacy military qualification (MIL-PRF-38535) are mandatory.
Availability
LM324J is available at Aetrix Electronics and suitable for industrial sensor interfaces, battery-powered instrumentation, and single-supply analog front-ends requiring stable component supply with traceable military-grade sourcing and long-term obsolescence management.
Supply support for LM324J 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 and embedded processing technologies, with over 50 years of op amp innovation and broad industrial/military qualification expertise.
The LM324J belongs to TI's legacy LMx24-N series of low-power quad op amps, engineered specifically for robust single-supply operation in harsh environments - emphasizing ground-referenced signal integrity, thermal stability, and long-lifecycle manufacturability.
FAQ
What is the maximum operating junction temperature for LM324J?
The LM324J has a maximum operating junction temperature of +125°C, consistent with its military-grade qualification and CDIP package construction. This rating is validated per TI's SNOSC16D datasheet Section 6.3, and enables reliable operation in high-ambient industrial enclosures where plastic-packaged variants like LM324N are limited to +70°C. The LM324J maintains full electrical performance across its 0°C to +70°C operating ambient range, with derating applied above that point based on thermal resistance (88°C/W).
Does LM324J support true rail-to-rail input and output?
The LM324J supports rail-to-rail input common-mode voltage (0 V to V+ −1.5 V), enabling direct ground-referenced signal acquisition, but does not provide rail-to-rail output swing - its output saturates at approximately 0 V (ground) on the low side and V+ −1.5 V on the high side under 2 kΩ load. This behavior is explicitly specified in Section 6.6 of the TI datasheet and confirmed across all LM324-N variants. For full rail-to-rail I/O, designers must select modern alternatives such as TLV2464 or OPA4340.
Can LM324J be used as a comparator?
Yes, LM324J can be used as a comparator in non-critical applications due to its open-loop configuration, wide input common-mode range including ground, and output swing to 0 V. However, it lacks internal hysteresis and has slow recovery from saturation (typical 1.5 µs), so external positive feedback is required for noise immunity, and timing-critical comparisons should use dedicated comparators like LM339. TI's datasheet Figure 31 explicitly shows an LM324J-based comparator with hysteresis.
What is the input bias current temperature coefficient for LM324J?
The LM324J features temperature-compensated input bias current, with a typical value of 45 nA at 25°C and a maximum of 150 nA over its full 0°C to +70°C operating ambient range. While the datasheet does not specify a formal temperature coefficient (e.g., nA/°C), the "temperature compensated" designation in Features Section 1 and Detailed Description Section 7.3 confirms intentional design to minimize drift - verified by stable 45 nA typ across temperature sweeps in Typical Characteristics Figure 2.
Is LM324J pin-compatible with LM324N and LM2902N?
Yes, LM324J is fully pin-compatible with LM324N (PDIP-14) and LM2902N (SOIC-14, TSSOP-14, PDIP-14) - all share identical 14-pin functional pinout per Section 5 of the TI datasheet. However, physical package dimensions differ: LM324J uses 19.56 mm × 6.67 mm CDIP, while LM324N uses 19.177 mm × 6.35 mm PDIP. PCB footprints are not interchangeable without mechanical redesign, though electrical connectivity and signal routing remain identical.
LM324J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LinCMOS™
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 45 nA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 1.5mA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- 0°C ~ 70°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
LM324J FAQ
1.How can I place an order for LM324J through Aetrix?
Please submit a Request for Quotation (RFQ) for LM324J 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 LM324J reliable?
The price and inventory of LM324J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM324J is usually 5 days.
3.What payment methods are accepted for LM324J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM324J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM324J?
LM324J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM324J 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 LM324J?
For technical support, including LM324J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM324J requirements.
6.How does Aetrix verify that LM324J is sourced from the original manufacturer or authorized distributors?
All LM324J 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 LM324J meets industry standards.
7.What is the process for return or replacement of LM324J?
All LM324J units undergo pre-shipment inspection (PSI). If there is an issue with LM324J, 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 LM324J part is unused and in its original packaging.
Return procedure for LM324J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM324J 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…
