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Texas Instruments LM6142AIN
- Part No.:
- LM6142AIN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM6142AIN.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,439
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Product details
Overview
LM6142AIN from Texas Instruments is a dual-channel rail-to-rail input/output operational amplifier optimized for low-voltage, low-power precision signal conditioning. It delivers 17MHz gain-bandwidth, 30V/μs slew rate, 650μA per amplifier quiescent current, 107dB CMRR, and operates from 2.7V to 24V supply - enabling high-fidelity analog front-ends in battery-powered depth sounders and portable instrumentation.
For engineers reviewing the LM6142AIN datasheet, LM6142AIN pinout, LM6142AIN application, or LM6142AIN equivalent, key selection considerations include its rail-to-rail input range (−0.25V to 5.25V at 5V supply), output swing within 30mV of rails (RL = 100kΩ), 1.8mV max input offset voltage (AI grade), and ability to drive capacitive loads without oscillation - critical for ADC buffering and single-supply sensor interfaces.
Technical Context
The LM6142AIN employs a patented dual-input-stage architecture combining NPN and PNP differential pairs to achieve true rail-to-rail common-mode input range beyond the supply rails (−0.25V to VS + 0.25V). Its slew-boosted output stage enables 30V/μs transient response while maintaining stability into ≥100pF capacitive loads - eliminating external isolation resistors in ADC driver configurations.
Designed for operation across 2.7V–24V supplies, it maintains 10MHz+ gain-bandwidth and >36° phase margin at 2.7V, with open-loop gain of 100V/mV (RL = 10kΩ) and 16nV/√Hz input voltage noise - supporting precision DC-coupled amplification and wideband AC signal paths in compact, thermally constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 17MHz at 50kHz (typ); enables stable unity-gain buffer or 10× closed-loop amplification up to ~1.7MHz. |
| Slew Rate | 30V/μs; supports full-scale 5V step response in <167ns - sufficient for 12-bit DAC settling and pulse amplification. |
| Input Offset Voltage | 1.0mV typ (2.2mV max, −40°C to 85°C); ensures ≤0.02% gain error in 50mV–5V sensor signal chains. |
| Supply Current | 650μA per amplifier; allows dual op-amp operation on coin-cell batteries for >1-year life in intermittent-use instruments. |
| CMRR | 107dB (0–4V VCM); rejects >99.999% of 1V common-mode interference in noisy industrial sensor nodes. |
| Output Swing | Within 30mV of rails (RL = 100kΩ); preserves >99% dynamic range at 3.3V supply - critical for maximizing ADC utilization. |
| PSRR | 87dB; attenuates 50mV ripple on 5V supply to <10μV at output - eliminates need for ultra-low-noise LDOs. |
Pinout & Package
LM6142AIN is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 9.81mm × 6.35mm body size and 0.3-inch lead spacing. This through-hole package supports manual prototyping, legacy PCBs, and high-reliability industrial assemblies requiring mechanical robustness and thermal mass.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (A) | High-impedance node (126MΩ) accepting signals from −0.25V to VS+0.25V - enables single-supply transducer interfacing. |
| 2 | Non-inverting Input (A) | Matches Pin 1's rail-to-rail CMVR; used for reference-based amplification or unity-gain follower configuration. |
| 3 | Output (A) | Capable of sourcing/sinking 10–24mA; swings within 30mV of VS/GND - drives 10kΩ ADC inputs directly. |
| 4 | V− (Ground) | Power return for both amplifiers; requires low-impedance connection to minimize PSRR degradation. |
| 5 | Non-inverting Input (B) | Independent input for second channel; identical specs to Pin 2 - supports dual-sensor signal conditioning. |
| 6 | Inverting Input (B) | Matches Pin 1 performance; enables matched differential pair or independent signal path routing. |
| 7 | Output (B) | Electrically isolated from Output A; supports dual-channel buffering without crosstalk (>130dB isolation). |
| 8 | V+ (Supply) | Accepts 2.7–24V; internal regulation ensures stable biasing across full voltage range - simplifies multi-rail system design. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends 0.25V beyond supply rails (−0.25V to VS+0.25V), eliminating level-shifting circuitry for ground-referenced sensors. |
| Rail-to-rail output swing | Delivers >99% of full-scale voltage swing at 3.3V supply - maximizes resolution when driving SAR ADCs. |
| Low quiescent current | 650μA per amplifier enables always-on signal monitoring in battery-powered fish finders with multi-year runtime. |
| Capacitive load drive | Stable into ≥100pF loads without external compensation - permits direct connection to long PCB traces or ADC input capacitance. |
| High CMRR & PSRR | 107dB CMRR and 87dB PSRR suppress noise coupling in mixed-signal embedded systems with shared power domains. |
Applications
| Depth Sounder Front-End | ADC Input Buffer |
|---|---|
Use Scenario: Amplifying weak echo signals (μV–mV) from piezoelectric transducers in marine sonar systems operating from 3.3V Li-ion batteries. IC Role / Device Role / Timing Role: Dual-channel transducer preamplifier and filter driver; first gain stage before programmable gain amplifier and 16-bit ADC sampling at 100ksps. Use Value: Rail-to-rail input captures full echo envelope including near-field zero-crossings; 17MHz GBW preserves ultrasonic pulse fidelity up to 1MHz. | Use Scenario: Isolating and scaling analog sensor outputs (e.g., temperature, pressure) into the input range of a 12-bit successive-approximation ADC. IC Role / Device Role / Timing Role: Precision unity-gain buffer with high input impedance and low output impedance - prevents ADC input loading and sampling errors. Use Value: 126MΩ input resistance avoids sensor signal attenuation; 30mV rail headroom ensures full 0–3.3V ADC code utilization without clipping. |
| Rail-to-Rail Instrumentation Amp | Barcode Scanner Signal Chain |
Use Scenario: Building a 3-op-amp instrumentation amplifier for single-supply medical ECG or strain gauge measurement where input must swing from GND to VS. IC Role / Device Role / Timing Role: Two LM6142AIN channels serve as matched input buffers in a 3-op-amp IA topology, rejecting common-mode noise from dry electrodes. Use Value: Eliminates need for precision resistor arrays; 107dB CMRR maintains >80dB noise rejection even with 1% resistor mismatch. | Use Scenario: Conditioning reflected laser diode signals in handheld barcode scanners powered by two AA cells (3V nominal). IC Role / Device Role / Timing Role: High-speed transimpedance amplifier converting photodiode current to voltage, followed by gain stage before comparator threshold detection. Use Value: 30V/μs slew rate resolves narrow barcode pulses (<500ns); 650μA supply current extends scanner duty-cycle battery life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV358IDR | Lower GBW (1MHz), higher VOS (3mV max), no rail-to-rail input - limited to mid-supply common-mode operation. | Suitable only for non-critical DC-coupled buffers where input stays near VS/2; cannot replace LM6142AIN in true rail-to-rail sensor interfaces. | Select LM6142AIN when input signals approach supply rails or require >10MHz bandwidth; LMV358IDR only where cost dominates and performance margins allow. |
| OPA2314AIDR | Higher precision (VOS = 0.75mV max), lower noise (14nV/√Hz), but lower slew rate (1.8V/μs) and narrower supply range (1.8–5.5V). | Better for low-noise, low-offset precision DC amplification (e.g., weigh scales), but unsuitable for fast pulse amplification or 12V+ supply systems. | Choose OPA2314AIDR for sub-mV offset-critical applications at 3.3V; retain LM6142AIN for wide supply (2.7–24V), high-speed, or rail-to-rail input requirements. |
Compared with LMV358IDR and OPA2314AIDR, the LM6142AIN uniquely combines rail-to-rail input *and* output, 17MHz bandwidth, and 2.7–24V operation - making it irreplaceable in battery-powered depth sounders and universal single/dual-supply instrumentation where signal fidelity across the full voltage range is mandatory.
Availability
LM6142AIN is available at Aetrix Electronics and suitable for battery-operated instrumentation, depth sounders/fish finders, and barcode scanners requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing.
Supply support for LM6142AIN 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 precision amplifiers, data converters, and power management ICs.
The LM614x family was engineered specifically for low-voltage, low-power precision analog signal conditioning in portable and battery-constrained systems - emphasizing rail-to-rail operation, wide supply flexibility, and robust capacitive-load drive capability.
FAQ
What is the maximum supply voltage rating for LM6142AIN?
The absolute maximum supply voltage for LM6142AIN is 33V, as specified in the Absolute Maximum Ratings table. Operation above this voltage risks permanent device damage. For reliable long-term use, TI recommends staying within the recommended operating range of 2.7V to 24V - where all electrical characteristics, including 17MHz gain-bandwidth and rail-to-rail performance, are fully guaranteed across temperature.
Does LM6142AIN support true rail-to-rail input at 3.3V supply?
Yes, LM6142AIN supports true rail-to-rail input at 3.3V supply: its common-mode input voltage range extends from −0.25V to 3.55V (VS + 0.25V), verified per the Electrical Characteristics table under VS = 2.7V and VS = 5V conditions. This allows direct interfacing with ground-referenced sensors and transducers without external level-shifting circuitry - a key advantage over conventional op-amps limited to VS/2-centered input ranges.
Can LM6142AIN drive a 1000pF capacitive load stably?
LM6142AIN is characterized for stable operation into ≥100pF capacitive loads without external compensation, as confirmed in the "Ability to drive large capacitive loads without oscillating" feature statement and typical characteristics (Figure 5-19–5-21). Driving 1000pF exceeds this specification and may cause peaking or oscillation; for such loads, TI recommends adding a series isolation resistor (e.g., 10–50Ω) between LM6142AIN output and the capacitance - a standard practice validated in Application Report SNOS726E Section 6.2.2.
What is the input offset voltage drift specification for LM6142AIN?
The input offset voltage drift for LM6142AIN is 3µV/°C, measured over the full operating temperature range of −40°C to +85°C. This value is explicitly listed in the Electrical Characteristics table (Section 5.6) under the dVOS/dT parameter. Combined with its 1.0mV typical VOS, this low drift ensures minimal gain error drift in precision DC amplification stages - critical for unattended, long-duration measurements in environmental monitoring equipment using LM6142AIN.
Is LM6142AIN pin-compatible with other LM614x variants like LM6142AIM/NOPB?
Yes, LM6142AIN is pin-compatible with all LM6142x variants in the same PDIP-8 package, including LM6142AIM and LM6142AIN/NOPB. The suffix differences denote packaging (N = PDIP, M = SOIC), RoHS compliance (NOPB), and temperature grade - but the die, pinout, and electrical functionality are identical. Engineers can substitute LM6142AIN for LM6142AIM in existing through-hole designs without layout changes, provided mechanical and thermal constraints of the PDIP package are met.
LM6142AIN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 25V/µs
- Gain Bandwidth Product:
- 18 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 174 nA
- Voltage - Input Offset:
- 1.3 mV
- Current - Supply:
- 750µA (x2 Channels)
- Current - Output / Channel:
- 24 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 24 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LM6142AIN FAQ
1.How can I place an order for LM6142AIN through Aetrix?
Please submit a Request for Quotation (RFQ) for LM6142AIN 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 LM6142AIN reliable?
The price and inventory of LM6142AIN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM6142AIN is usually 5 days.
3.What payment methods are accepted for LM6142AIN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM6142AIN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM6142AIN?
LM6142AIN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM6142AIN 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 LM6142AIN?
For technical support, including LM6142AIN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM6142AIN requirements.
6.How does Aetrix verify that LM6142AIN is sourced from the original manufacturer or authorized distributors?
All LM6142AIN 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 LM6142AIN meets industry standards.
7.What is the process for return or replacement of LM6142AIN?
All LM6142AIN units undergo pre-shipment inspection (PSI). If there is an issue with LM6142AIN, 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 LM6142AIN part is unused and in its original packaging.
Return procedure for LM6142AIN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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