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Texas Instruments LM148J/PB
- Part No.:
- LM148J/PB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
LM148J/PB.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:414
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Product details
Overview
LM148J/PB from Texas Instruments is a quad operational amplifier with 741-compatible architecture, designed for high-isolation analog signal conditioning in military-temperature-range systems (−55°C to +125°C). It delivers 1.0 MHz unity-gain bandwidth, 0.5 V/μs slew rate, and 1 mV typical input offset voltage across four independent amplifiers, each drawing only 0.6 mA supply current - enabling dense multi-channel designs such as instrumentation amplifier front-ends and active filter banks.
For engineers reviewing the LM148J/PB datasheet, LM148J/PB pinout, LM148J/PB application, or LM148J/PB equivalent, this device supports precision DC-coupled gain stages, low-distortion waveform generation, and rail-to-rail-capable common-mode input operation - with verified thermal stability and overload protection critical for aerospace sensor interfaces and ruggedized test equipment.
Technical Context
The LM148J/PB implements four fully independent Class AB output-stage op amps on a single ceramic dual-in-line package (CDIP), each internally compensated for unity-gain stability and featuring separate biasing to achieve 120 dB amplifier-to-amplifier isolation. Its input stage uses matched transistor pairs to deliver low input bias current (30 nA typ) and low input offset current (4 nA typ), while maintaining compatibility with legacy 741-based circuits.
It operates from ±22 V supplies with differential input voltage tolerance up to ±44 V, supports continuous output short-circuit protection, and maintains specified performance over its full −55°C to +125°C operating range - distinguishing it from commercial-grade LM348-N and industrial LM248-N variants which have narrower temperature limits and lower maximum supply voltages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±22 V - Enables operation in high-voltage analog subsystems without external level-shifting. |
| Unity-Gain Bandwidth | 1.0 MHz - Supports stable closed-loop gain configurations up to ~100 kHz with adequate phase margin. |
| Slew Rate | 0.5 V/μs - Limits large-signal transient response; suitable for audio-band and low-speed control loops. |
| Input Offset Voltage | 1.0 mV (typ) - Minimizes DC error in precision gain stages and sensor signal conditioning paths. |
| Supply Current per Amp | 0.6 mA - Allows four-channel operation at <2.4 mA total, ideal for power-constrained embedded systems. |
| Operating Temperature | −55°C to +125°C - Qualified for military/aerospace applications where extended thermal reliability is mandatory. |
| Input Bias Current | 30 nA (typ) - Reduces voltage error across high-impedance feedback networks and sensor bridges. |
| Amplifier Isolation | 120 dB - Prevents crosstalk between channels in multi-signal acquisition or parallel filter banks. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 14-pin, hermetically sealed with glass-frit lid (Package J0014A); 5.08 mm max height; RoHS-exempt due to military-spec construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Amp 1 Output | Drives external load or feedback network; Class AB stage capable of ±25 mA short-circuit current. |
| 2 | Amp 1 Inverting Input | Inverts input signal; adjacent to Pin 1 for minimal trace length in inverting configurations. |
| 3 | Amp 1 Non-Inverting Input | Accepts reference or sensor signal; supports common-mode input up to ±12 V with ±15 V supplies. |
| 4 | Negative Supply (V−) | Common return for all four amplifiers; must be decoupled locally to suppress inter-channel noise coupling. |
| 5 | Amp 2 Non-Inverting Input | Independent input node; electrically isolated from other amplifiers by layout and bias separation. |
| 6 | Amp 2 Inverting Input | Paired with Pin 7 output; enables compact PCB routing for dual inverting gain stages. |
| 7 | Amp 2 Output | Corner-pin placement minimizes capacitive coupling to adjacent amplifiers in multi-channel layouts. |
| 8 | Positive Supply (V+) | Shared rail for all amplifiers; requires low-ESR bypass capacitor near Pin 8 to maintain PSRR >77 dB. |
| 9 | Amp 3 Inverting Input | Positioned opposite Pin 10 output; facilitates symmetrical layout of three or four parallel amplifier sections. |
| 10 | Amp 3 Output | Third corner output; enables star-ground topology with dedicated ground return paths per channel. |
| 11 | Amp 3 Non-Inverting Input | Supports differential input configurations when paired with external resistor networks. |
| 12 | Amp 4 Non-Inverting Input | Final input node; allows full utilization of quad topology for multi-function analog blocks (e.g., filter + buffer + comparator). |
| 13 | Amp 4 Inverting Input | Adjacent to Pin 14 output; optimized for feedback loop stability with minimal parasitic capacitance. |
| 14 | Amp 4 Output | Fourth corner output; completes quad symmetry for balanced PCB layout and thermal distribution. |
Key Features
| Feature | Design Value |
|---|---|
| True quad 741 compatibility | Pinout, gain, bandwidth, and DC specs match LM741 per channel - enabling drop-in replacement in legacy designs. |
| Class AB output stage | Eliminates crossover distortion in audio and precision DC applications without requiring external compensation. |
| Independent amplifier biasing | Enables 120 dB channel-to-channel isolation - critical for simultaneous sampling and multi-path signal processing. |
| Overload protection | Withstands indefinite output short-circuit to either supply rail without latch-up or permanent damage. |
| Low input offset current | 4 nA typical - preserves accuracy in high-Z transducer interfaces (e.g., piezoelectric sensors, photodiode amps). |
| Military temperature qualification | Rated for −55°C to +125°C operation - validated per RETS 148X specifications for aerospace and defense use. |
Applications
| Instrumentation Amplifier Front-End | Low-Distortion Sinewave Generator |
|---|---|
Use Scenario: High-CMRR differential measurement of millivolt-level thermocouple or strain gauge outputs in avionics data acquisition units. IC Role / Device Role / Timing Role: First-stage gain and common-mode rejection using two LM148J/PB amplifiers in standard 3-op-amp IA configuration. Use Value: 120 dB inter-amplifier isolation prevents cross-talk between reference and sense paths, preserving measured signal integrity under EMI stress. |
Use Scenario: Precision 5 kHz sine wave source for calibration of RF receiver IF stages in field-deployable test sets. IC Role / Device Role / Timing Role: Quadrature oscillator core with amplitude stabilization via diode-limited feedback (Fig. 19, TI SNOSBT2E). Use Value: 0.03% THD achieved using LM148J/PB's low input offset and matched internal transistors - eliminating need for manual trimming. |
| Peak Detector with Drift Compensation | State-Variable Active Filter Bank |
Use Scenario: Capturing peak amplitude of pulsed radar return signals in airborne electronic warfare receivers. IC Role / Device Role / Timing Role: Third amplifier in Fig. 21 (TI SNOSBT2E) configured as bias-compensated peak hold with low-leakage diode interface. Use Value: 30 nA input bias current minimizes discharge error during hold phase, extending effective hold time beyond 100 ms. |
Use Scenario: Reconfigurable band-pass filtering of multi-band communications signals in SATCOM modems. IC Role / Device Role / Timing Role: All four amplifiers used in universal state-variable topology (Fig. 22, TI SNOSBT2E) to generate simultaneous LP/HP/BP outputs. Use Value: Unity-gain bandwidth and slew rate support Q-tuning up to f₀Q ≤ 4×10⁴ - enabling sharp selectivity at VHF frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM248J/PB | Lower max supply voltage (±18 V), reduced max junction temperature (110°C), and narrower operating range (−25°C to +85°C). | Qualified for industrial but not military environments; unsuitable for flight-critical or extended-temperature deployments. | Select LM248J/PB only when cost sensitivity outweighs extended temperature or voltage headroom requirements. |
| LM348N | Plastic DIP package (NFF), commercial temperature range (0°C to +70°C), 750 mW power dissipation limit, no military spec validation. | Intended for benchtop instruments and non-ruggedized consumer electronics; lacks hermetic sealing and radiation tolerance. | Choose LM348N for prototyping or cost-driven volume production where environmental robustness is not required. |
Compared with LM248J/PB and LM348N, the LM148J/PB provides the widest supply voltage range, highest temperature rating, and hermetic CDIP packaging - making it the sole option qualified for mission-critical analog signal chains in defense and space platforms.
Availability
LM148J/PB is available at Aetrix Electronics and suitable for aerospace sensor interfaces, ruggedized test equipment, and military-grade instrumentation requiring stable component supply across extended temperature extremes and long product lifecycles.
Supply support for LM148J/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, embedded processing, and connectivity technologies, with decades of heritage in precision op amp design and military-grade component qualification.
The LM148 series belongs to TI's legacy high-reliability analog portfolio, engineered specifically for applications demanding 741 compatibility, multi-channel isolation, and operation across extreme environmental conditions - including avionics, missile guidance, and satellite subsystems.
FAQ
What is the maximum supply voltage rating for LM148J/PB?
The LM148J/PB supports a maximum supply voltage of ±22 V, significantly higher than the ±18 V limit of LM248J/PB and ±18 V of LM348N. This allows direct integration into high-voltage analog subsystems without external regulators or level shifters - a key differentiator confirmed in TI's Absolute Maximum Ratings table for the LM148 variant.
Does LM148J/PB support operation at −55°C?
Yes, LM148J/PB is fully specified and tested for operation from −55°C to +125°C, meeting military temperature range requirements. This is explicitly documented in TI's SNOSBT2E datasheet under "Operating Temperature Range" for LM148, and validated per RETS 148X specifications - unlike LM248J/PB (−25°C to +85°C) or LM348N (0°C to +70°C).
Is LM148J/PB pin-compatible with standard LM741 op amps?
No - LM148J/PB is a quad op amp in a 14-pin CDIP, while LM741 is a single op amp in an 8-pin package. However, each of the four amplifiers inside LM148J/PB matches LM741 electrical behavior (gain, bandwidth, offset, etc.) and shares identical per-amplifier pin relationships (e.g., inverting input adjacent to output), enabling functional drop-in replacement in multi-741 designs.
What package type does LM148J/PB use, and why does it matter?
LM148J/PB uses a hermetically sealed ceramic dual-in-line package (CDIP, J0014A), providing superior moisture resistance, thermal stability, and long-term reliability versus plastic DIP packages. This construction is essential for aerospace, defense, and downhole applications where humidity, thermal cycling, and outgassing must be strictly controlled - as confirmed in TI's Package Option Addendum.
How does LM148J/PB achieve 120 dB amplifier-to-amplifier isolation?
LM148J/PB achieves 120 dB isolation through independent biasing of each amplifier and specialized IC layout techniques that minimize thermal coupling and substrate noise injection. This is measured as "amplifier-to-amplifier coupling" in TI's Electrical Characteristics table and is critical for simultaneous multi-channel acquisition where crosstalk would corrupt correlated signal measurements.
LM148J/PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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:
- 0.5V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 30 nA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 2.4mA (x4 Channels)
- Current - Output / Channel:
- 25 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
LM148J/PB FAQ
1.How can I place an order for LM148J/PB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM148J/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 LM148J/PB reliable?
The price and inventory of LM148J/PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM148J/PB is usually 5 days.
3.What payment methods are accepted for LM148J/PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM148J/PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM148J/PB?
LM148J/PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM148J/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 LM148J/PB?
For technical support, including LM148J/PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM148J/PB requirements.
6.How does Aetrix verify that LM148J/PB is sourced from the original manufacturer or authorized distributors?
All LM148J/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 LM148J/PB meets industry standards.
7.What is the process for return or replacement of LM148J/PB?
All LM148J/PB units undergo pre-shipment inspection (PSI). If there is an issue with LM148J/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 LM148J/PB part is unused and in its original packaging.
Return procedure for LM148J/PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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