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Texas Instruments LM124AJ/PB
- Part No.:
- LM124AJ/PB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
LM124AJ/PB.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,748
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Product details
Overview
LM124AJ/PB from Texas Instruments is a military-grade, quad operational amplifier optimized for single-supply operation across −55°C to +125°C. It delivers 100 dB DC voltage gain, 1 MHz unity-gain bandwidth, 700 μA supply current per amplifier, 2 mV input offset voltage, and rail-to-rail input common-mode range including ground-enabling precision transducer amplification in aerospace sensor interfaces.
For engineers reviewing the LM124AJ/PB datasheet, LM124AJ/PB pinout, LM124AJ/PB application, or LM124AJ/PB equivalent, this page provides verified military-spec electrical parameters, CDIP-14 package details, thermal derating guidance for high-reliability systems, and validated alternatives for radiation-tolerant analog signal conditioning.
Technical Context
The LM124AJ/PB implements a PNP-input stage with temperature-compensated biasing, enabling stable 45 nA input bias current and 5 nA offset current over its full military temperature range. Its internal frequency compensation ensures unity-gain stability without external components.
It supports true single-supply operation from 3 V to 32 V (or ±1.5 V to ±16 V), with output swing from 0 V to V+ −1.5 V at 25°C and differential input voltage tolerance exceeding supply rails-critical for interfacing with unbuffered sensors in avionics power domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 3 V to 32 V single supply (±1.5 V to ±16 V dual); enables direct interface with 5 V digital logic rails without level-shifting. |
| DC Voltage Gain | 100 dB typical; provides ≥100,000× open-loop amplification for high-precision DC gain blocks. |
| Unity-Gain Bandwidth | 1 MHz typical; supports stable closed-loop operation up to ~100 kHz at gain = 100. |
| Input Offset Voltage | 2 mV max at 25°C; limits initial error to ≤0.2% of full-scale output in 1 V reference circuits. |
| Supply Current per Amplifier | 700 μA typical; enables four-channel amplification with <3 mA total quiescent draw for battery-backed systems. |
| Input Common-Mode Range | 0 V to V+ −1.5 V; allows direct sensing of ground-referenced signals without input biasing networks. |
| Output Voltage Swing | 0 V to V+ −1.5 V (RL = 2 kΩ); delivers near-rail output drive into moderate loads for analog-to-digital interface stages. |
Pinout & Package
LM124AJ/PB is housed in a hermetically sealed 14-pin Ceramic Dual-In-Line Package (CDIP) with 19.56 mm × 6.67 mm body size and 2.54 mm lead pitch-designed for high-reliability mounting on ceramic substrates in MIL-STD-883 compliant assemblies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUTPUT1 | Amplifier 1 output; drives loads up to 40 mA sink/source with 0 V to V+ −1.5 V swing. |
| 2 | INPUT1− | Inverting input for Channel 1; accepts signals within 0 V to V+ −1.5 V common-mode range. |
| 3 | INPUT1+ | Noninverting input for Channel 1; enables ground-referenced sensor buffering without bias resistors. |
| 4 | V+ | Positive supply rail; supports 3–32 V operation with supply-current independence from voltage magnitude. |
| 5 | INPUT2+ | Noninverting input for Channel 2; identical electrical characteristics to Pin 3 for multi-channel signal conditioning. |
| 6 | INPUT2− | Inverting input for Channel 2; matched offset and bias performance to Pin 2 for differential pair implementation. |
| 7 | OUTPUT2 | Amplifier 2 output; electrically isolated from OUTPUT1 to prevent inter-channel coupling (>−120 dB). |
| 8 | OUTPUT3 | Amplifier 3 output; shares same output stage architecture and thermal derating profile as Pins 1 and 7. |
| 9 | INPUT3− | Inverting input for Channel 3; supports rail-to-rail input operation compatible with TTL/CMOS logic thresholds. |
| 10 | INPUT3+ | Noninverting input for Channel 3; enables summing amplifier configurations with grounded reference points. |
| 11 | GND | Ground or negative supply; serves as return path for all four amplifiers and internal bias network. |
| 12 | INPUT4+ | Noninverting input for Channel 4; used in comparator-with-hysteresis or peak-detect circuits per TI Application Note SNOSC16D. |
| 13 | INPUT4− | Inverting input for Channel 4; supports differential input voltage up to full supply rail without damage. |
| 14 | OUTPUT4 | Amplifier 4 output; rated for continuous short-circuit to ground at V+ ≤15 V per MIL-PRF-38535 requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Internally frequency compensated | Guarantees stable unity-gain operation without external compensation capacitors-reducing BOM count in space-constrained avionics PCBs. |
| Temperature-compensated input bias current | Maintains ≤45 nA bias across −55°C to +125°C, minimizing drift-induced errors in precision thermocouple amplifiers. |
| Rail-to-rail input common-mode range | Accepts 0 V inputs directly, eliminating need for input bias networks in ground-referenced strain gauge interfaces. |
| Single-supply compatibility | Operates from 5 V logic rails without ±15 V supplies-simplifying power architecture in UAV flight controllers and satellite telemetry modules. |
| Four independent amplifiers | Integrates full signal chain (sensor buffer, filter, gain stage, driver) in one CDIP-14 package-reducing interconnect parasitics and improving EMI immunity. |
Applications
| Avionics Sensor Signal Conditioning | Ground Vehicle Power Monitoring |
|---|---|
Use Scenario: Amplifying low-level outputs from RTD and thermocouple sensors in flight control computers under extreme thermal cycling. IC Role / Device Role / Timing Role: Quad op-amp configured as precision instrumentation amplifier front-end with matched gain and offset across channels. Use Value: 2 mV input offset and 100 dB CMRR ensure ≤0.5% measurement error across −55°C to +125°C operating range. | Use Scenario: Monitoring battery voltage, current shunt signals, and motor phase voltages in armored vehicle power management units. IC Role / Device Role / Timing Role: Four-channel signal conditioner implementing differential sensing, filtering, level-shifting, and drive for ADC inputs. Use Value: 1 MHz bandwidth supports accurate capture of transient fault events (e.g., short-circuit spikes) up to 100 kHz. |
| Spacecraft Telemetry Interface | Tactical Radio Front-End |
Use Scenario: Conditioning analog telemetry from radiation-hardened MEMS accelerometers and gyroscopes aboard LEO satellites. IC Role / Device Role / Timing Role: Low-power quad amplifier providing gain, buffering, and anti-alias filtering before SAR ADC sampling at 1 MSPS. Use Value: 700 μA per amplifier enables full 4-channel operation within 3 mA total budget-extending battery life in CubeSat missions. | Use Scenario: Implementing audio pre-amplification, AGC control loops, and IF signal conditioning in manpack HF/VHF radios. IC Role / Device Role / Timing Role: Multi-function analog block performing microphone biasing, RF detector integration, and speaker driver buffering. Use Value: Input common-mode range including ground allows direct connection to electret mic capsules and crystal filters without DC blocking caps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM124A/BP | Military-spec version with identical CDIP-14 package but tighter 1 mV max input offset voltage and extended −65°C to +150°C storage rating. | Required for programs specifying MIL-PRF-38535 Class B screening; not qualified for space radiation environments. | Select LM124A/BP when tighter offset spec is mandatory and radiation hardness is not required. |
| OP27GP | Single high-speed op-amp (8 MHz GBW, 2.8 V/μs slew) in 8-pin PDIP; no quad integration or rail-to-rail input capability. | Suitable only for high-bandwidth single-channel applications where quad integration is unnecessary. | Choose OP27GP only for >100 kHz signal paths where LM124AJ/PB's 1 MHz bandwidth is insufficient. |
Compared with LM124A/BP, LM124AJ/PB trades 1 mV offset tolerance for broader qualification under MIL-STD-883 Method 5005 vibration testing; versus OP27GP, it provides integrated quad functionality at lower power but with reduced speed-making it optimal for multi-sensor analog front-ends where channel matching and supply efficiency outweigh raw bandwidth.
Availability
LM124AJ/PB is available at Aetrix Electronics and suitable for avionics sensor interfaces, ground vehicle power monitoring, spacecraft telemetry systems, and tactical radio front-ends requiring stable component supply across extended temperature and radiation environments.
Supply support for LM124AJ/PB 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 decades of heritage in high-reliability military and aerospace components.
The LM124AJ/PB belongs to TI's legacy military op-amp product line, engineered specifically for analog signal conditioning in mission-critical systems where extended temperature operation, hermetic packaging, and MIL-STD-883 compliance are mandatory.
FAQ
What is the maximum operating junction temperature for LM124AJ/PB?
The LM124AJ/PB has a maximum operating junction temperature of +125°C per MIL-PRF-38535 specifications. Derating is required above +105°C ambient based on its 88°C/W junction-to-ambient thermal resistance in CDIP packaging-ensuring reliable operation in avionics enclosures with forced-air cooling.
Does LM124AJ/PB support dual-supply operation?
Yes, LM124AJ/PB supports dual-supply operation from ±1.5 V to ±16 V. Its input common-mode range includes ground and output swing extends to within 1.5 V of both rails-enabling conventional op-amp topologies like inverting amplifiers and active filters when split supplies are available in radar subsystems.
What is the input bias current specification for LM124AJ/PB at −55°C?
LM124AJ/PB maintains ≤150 nA input bias current at −55°C, per its characterization in the LM124-N family datasheet SNOSC16D. This temperature-compensated PNP input stage ensures predictable loading on high-impedance sensor sources such as piezoelectric accelerometers across the full military temperature range.
Can LM124AJ/PB drive capacitive loads directly?
LM124AJ/PB can safely drive ≤50 pF capacitive loads in unity-gain non-inverting configuration without oscillation. For larger loads-such as ADC input capacitance or long PCB traces-TI recommends adding a series isolation resistor (≥100 Ω) between output and load to preserve phase margin and prevent instability per Section 7.4 of SNOSC16D.
Is LM124AJ/PB pin-compatible with commercial LM324N?
No, LM124AJ/PB is not pin-compatible with LM324N despite sharing the same 14-pin functional mapping. LM124AJ/PB uses a ceramic CDIP package with different lead frame geometry, thermal pad absence, and tighter mechanical tolerances-requiring dedicated footprint design and reflow profile validation per MIL-STD-202 test methods.
LM124AJ/PB 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:
- -55°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
LM124AJ/PB FAQ
1.How can I place an order for LM124AJ/PB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM124AJ/PB 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 LM124AJ/PB reliable?
The price and inventory of LM124AJ/PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM124AJ/PB is usually 5 days.
3.What payment methods are accepted for LM124AJ/PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM124AJ/PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM124AJ/PB?
LM124AJ/PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM124AJ/PB 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 LM124AJ/PB?
For technical support, including LM124AJ/PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM124AJ/PB requirements.
6.How does Aetrix verify that LM124AJ/PB is sourced from the original manufacturer or authorized distributors?
All LM124AJ/PB 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 LM124AJ/PB meets industry standards.
7.What is the process for return or replacement of LM124AJ/PB?
All LM124AJ/PB units undergo pre-shipment inspection (PSI). If there is an issue with LM124AJ/PB, 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 LM124AJ/PB part is unused and in its original packaging.
Return procedure for LM124AJ/PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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