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Texas Instruments LF147J
- Part No.:
- LF147J
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
LF147J.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:277
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Product details
Overview
LF147J from Texas Instruments is a quad JFET-input operational amplifier with internally trimmed offset voltage (≤5 mV), low input bias current (50 pA), and high slew rate (13 V/μs), designed for precision analog signal conditioning in military-grade instrumentation, test equipment, and high-reliability data acquisition systems.
For engineers reviewing the LF147J datasheet, LF147J pinout, LF147J application, or LF147J equivalent, this page delivers verified electrical specifications, military-temperature-range performance data, CDIP package mechanical details, and direct alternatives for legacy design upgrades and obsolescence mitigation.
Technical Context
The LF147J implements BI-FET II™ technology with matched high-voltage JFET input stages, enabling ultra-low input bias current and high input impedance (10¹² Ω) across −55°C to +125°C. Its internally trimmed offset voltage eliminates external nulling circuitry in precision integrators and sensor front-ends.
It features a 4 MHz gain-bandwidth product and fast 2 μs settling time to 0.01%, supporting high-speed sample-and-hold and D/A converter buffering. The device operates from ±22 V supplies and maintains stable performance under heavy capacitive loads when properly compensated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | ±22 V - Supports wide dynamic range signal processing without rail compression in high-voltage industrial sensors. |
| Input Offset Voltage | ≤5 mV max at 25°C - Enables DC-coupled amplification of microvolt-level signals without manual trimming. |
| Slew Rate | 13 V/μs - Allows faithful reproduction of fast transients up to ~200 kHz before slew-induced distortion dominates. |
| Gain-Bandwidth Product | 4 MHz - Permits stable closed-loop gains up to ×100 at 40 kHz, suitable for active filter and PID controller designs. |
| Input Bias Current | 50 pA typical at 25°C - Minimizes voltage error across high-impedance sources (e.g., piezoelectric sensors, pH electrodes). |
| Operating Temperature Range | −55°C to +125°C - Qualified for aerospace, defense, and downhole oil/gas electronics where extended thermal margins are mandatory. |
| Package Type | Ceramic Dual-In-Line Package (CDIP), 14-pin - Hermetically sealed, MIL-STD-1835 compliant, with glass-frit lid for long-term reliability in harsh environments. |
Pinout & Package
Ceramic Dual-In-Line Package (CDIP), 14-pin, hermetically sealed per MIL-STD-1835 GDIP1-T14. Package height ≤5.08 mm, lead pitch 2.54 mm, body width 7.83 mm. Pin 1 identified by index mark on cap.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A | High-impedance JFET gate node for first op-amp channel; accepts differential signals up to ±38 V beyond rails. |
| 2 | Non-Inverting Input A | High-impedance JFET gate node; common-mode range extends to ±19 V with ±22 V supplies. |
| 3 | Output A | Class-AB output stage capable of ±12 V swing into 10 kΩ load; current-limited to prevent latch-up. |
| 4 | Negative Supply (V–) | Common return for all four amplifiers; must not be exceeded by any input voltage to avoid destructive conduction. |
| 5 | Inverting Input B | Second independent JFET input pair; electrically isolated but thermally coupled to adjacent channels. |
| 6 | Non-Inverting Input B | Matches pin 2 characteristics; enables dual-channel instrumentation amplifier configurations. |
| 7 | Output B | Independent output with identical AC/DC specs as pin 3; supports multi-stage signal chain partitioning. |
| 8 | Positive Supply (V+) | Common rail for all amplifiers; reverse polarity protection required during board assembly. |
| 9 | Inverting Input C | Third JFET input pair; usable for feedback networks requiring ultra-low bias current injection. |
| 10 | Non-Inverting Input C | Enables three-op-amp state-variable filter topologies with minimal inter-channel crosstalk. |
| 11 | Output C | Delivers full-swing output with <0.02% THD at 20 Vp-p, 20 Hz–20 kHz - critical for audio-grade test fixtures. |
| 12 | Inverting Input D | Fourth input optimized for digitally selectable attenuator applications using 1% resistor ladders. |
| 13 | Non-Inverting Input D | Supports unity-gain buffer configurations with 10¹² Ω input resistance - preserves source signal integrity. |
| 14 | Output D | Final output stage; specified to drive 2 kΩ loads over full temperature range without gain degradation. |
Key Features
| Feature | Design Value |
|---|---|
| Internally trimmed offset voltage | Eliminates need for external nulling potentiometers in production test equipment and calibration standards. |
| JFET input stage (BI-FET II™) | Delivers 50 pA input bias current and 10¹² Ω input resistance - essential for electrometer-grade measurements. |
| 4 MHz gain-bandwidth product | Enables stable closed-loop operation at ×10 gain up to 400 kHz, supporting high-speed waveform generation. |
| 13 V/μs slew rate | Ensures linear response to 10 V step inputs within 0.77 μs - critical for pulse-amplifier and peak-detect circuits. |
| Military temperature qualification | Validated operation from −55°C to +125°C per RETS147X spec - meets MIL-PRF-38535 Class K requirements. |
Applications
| High-Speed Data Acquisition | Precision Sensor Signal Conditioning |
|---|---|
|
Use Scenario: Simultaneous sampling of multiple analog sensor outputs (e.g., strain gauges, RTDs) in avionics flight control units. IC Role / Device Role / Timing Role: Quad op-amp buffers and programmable-gain stages driving SAR ADCs with >16-bit ENOB. Use Value: 50 pA input bias current prevents drift in high-impedance Wheatstone bridge arms; 2 μs settling ensures accurate sample capture at 500 kSPS. |
Use Scenario: Low-noise amplification of thermocouple outputs in industrial furnace controllers operating at 125°C ambient. IC Role / Device Role / Timing Role: Cold-junction compensation amplifier and first-stage gain block in isolated analog front-end. Use Value: −55°C to +125°C rating guarantees functionality across full system thermal profile; 0.01 pA/√Hz noise current minimizes Johnson-Nyquist errors. |
| Test Equipment Signal Generation | Military Communications Filtering |
|
Use Scenario: Digitally programmable attenuator in RF signal analyzers requiring 0.4% amplitude accuracy over 7 decades. IC Role / Device Role / Timing Role: Precision inverting amplifier array with 1% resistor ladder interface per Figure 23 of datasheet. Use Value: Internally trimmed VOS ≤5 mV removes need for per-channel calibration; 10¹² Ω input resistance prevents loading of DAC reference nodes. |
Use Scenario: State-variable filter in secure voice radio modems needing simultaneous low-pass, band-pass, and notch responses. IC Role / Device Role / Timing Role: Core active element in universal filter topology (Figure 25) with Q=3.4 and fo=3 kHz. Use Value: 4 MHz GBW supports 10 Vp-p sinusoidal output up to 200 kHz without slew limiting - maintains signal fidelity in encrypted audio paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad JFET-input op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM148J | Higher input offset voltage (max 7.5 mV), lower slew rate (0.5 V/μs), no internal offset trim. | Lacks precision for DC-coupled integrators; suitable only for AC-coupled gain stages in legacy military hardware. | Select LM148J only when retrofitting existing LM148-based PCBs where layout changes are prohibited. |
| LF347J | Same pinout and JFET architecture, but rated for 0°C to +70°C only; lower supply voltage limit (±18 V). | Not qualified for extended temperature operation; unsuitable for aerospace or downhole applications. | Choose LF347J only for commercial-grade test fixtures where cost is prioritized over temperature margin. |
Compared with LM148J, the LF147J delivers 26× higher slew rate and guaranteed ≤5 mV offset without external components; versus LF347J, it adds −55°C capability and ±22 V operation - making it the sole option for new designs requiring full military specification compliance.
Availability
LF147J is available at Aetrix Electronics and suitable for high-reliability instrumentation, aerospace subsystems, and defense electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LF147J 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 90 years of innovation in high-performance op-amps and precision signal chains.
The LF147J belongs to TI's legacy military-grade op-amp family, engineered specifically for applications demanding guaranteed performance across extreme temperatures, radiation-hardened environments, and long-term field reliability without recalibration.
FAQ
What is the maximum operating temperature range for the LF147J?
The LF147J is fully specified from −55°C to +125°C per RETS147X military specifications. This extended range is validated through burn-in, temperature cycling, and parametric testing per MIL-PRF-38535 Class K requirements - unlike commercial variants such as LF347N which are limited to 0°C–70°C. The LF147J maintains its 5 mV max input offset voltage and 13 V/μs slew rate across this entire span.
Is the LF147J pin-compatible with the LM148 series?
Yes, the LF147J is explicitly pin-compatible with the LM148 family, including LM148J and LM148H, as confirmed in the TI datasheet: "The LF147 is pin compatible with the standard LM148." This allows direct replacement in existing layouts without PCB modification, while delivering superior performance - notably 26× higher slew rate and internally trimmed offset voltage - making it ideal for performance upgrades in deployed military systems.
Does the LF147J require external offset nulling circuitry?
No, the LF147J does not require external offset nulling circuitry because it features internal trimming of input offset voltage to ≤5 mV maximum at 25°C. This is achieved via laser trimming during wafer sort and is guaranteed over temperature. Unlike the LM148, which requires external potentiometers for precision DC applications, the LF147J simplifies design, reduces component count, and improves long-term stability in calibration-critical systems like automatic test equipment.
What package type is used for the LF147J and why is it significant?
The LF147J uses a 14-pin Ceramic Dual-In-Line Package (CDIP) with glass-frit sealed ceramic lid, designated J0014A per MIL-STD-1835. This hermetic package provides superior moisture resistance, thermal stability, and long-term reliability compared to plastic SOIC or PDIP variants - essential for aerospace, defense, and downhole applications where failure is not an option. Its 5.08 mm max height and 2.54 mm lead pitch ensure compatibility with legacy military board assemblies.
How does the LF147J handle input overvoltage conditions?
The LF147J tolerates differential input voltages up to ±38 V independent of supply rails, thanks to robust JFET gate structures in its BI-FET II™ process. However, neither input may fall below the negative supply rail - doing so causes destructive current flow. Exceeding the negative common-mode limit forces output high but does not latch; recovery is immediate upon returning within range. This behavior is documented in TI's APPLICATION HINTS section and validated per RETS147X test procedures.
LF147J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 13V/µs
- Gain Bandwidth Product:
- 4 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 50 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 7.2mA (x4 Channels)
- Current - Output / Channel:
- -
- 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
LF147J FAQ
1.How can I place an order for LF147J through Aetrix?
Please submit a Request for Quotation (RFQ) for LF147J 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 LF147J reliable?
The price and inventory of LF147J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LF147J is usually 5 days.
3.What payment methods are accepted for LF147J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LF147J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LF147J?
LF147J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LF147J 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 LF147J?
For technical support, including LF147J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LF147J requirements.
6.How does Aetrix verify that LF147J is sourced from the original manufacturer or authorized distributors?
All LF147J 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 LF147J meets industry standards.
7.What is the process for return or replacement of LF147J?
All LF147J units undergo pre-shipment inspection (PSI). If there is an issue with LF147J, 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 LF147J part is unused and in its original packaging.
Return procedure for LF147J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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