My Inquiry
My Account
Texas Instruments LMC6042IM
- Part No.:
- LMC6042IM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC6042IM.pdf
- Description:
- IC CMOS 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,749
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMC6042IM from Texas Instruments is a CMOS dual micropower operational amplifier designed for ultra-low-power, high-impedance signal conditioning. It delivers 10 μA/amp supply current (typ), 2 fA input bias current (typ), rail-to-rail output swing, and operates from 4.5 V to 15 V single supply - enabling use in battery-powered pH probe buffers and photodiode preamplifiers.
For engineers reviewing the LMC6042IM datasheet, LMC6042IM pinout, LMC6042IM application, or LMC6042IM equivalent, key selection criteria include verified input leakage (<2 fA), guaranteed rail-to-rail output at 5 V/15 V, −40°C to +85°C operating range, and SOIC-8 packaging with RoHS-compliant lead finish.
Technical Context
The LMC6042IM uses TI's Double-Poly Silicon-Gate CMOS process to achieve ultra-low input bias current and insensitivity to latch-up. Its output stage connects directly to the internal integrator - not a push-pull buffer - enabling rail-to-rail swing while maintaining low output impedance and high open-loop gain (>300 V/mV at 100 kΩ load).
This architecture supports stable operation with capacitive loads when compensated via external pull-up resistors or feed-forward networks, and enables high-precision DC-coupled instrumentation amplifier topologies with independent gain and CMRR trim using only two op-amps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 20 μA per amplifier (typ) - enables multi-year battery life in portable analyzers |
| Input Bias Current | 2 fA (typ) - preserves signal integrity in picoamp-level transducer interfaces |
| Rail-to-Rail Output | Swings within 13 mV of V− and 130 mV of V+ at 15 V supply - maximizes dynamic range in single-supply systems |
| Input Common-Mode Range | Includes ground (−0.1 V min) - allows direct sensing of 0 V-referenced sensors like pH electrodes |
| CMRR | 62 dB (min) at temperature extremes - ensures stable DC gain in noisy industrial environments |
| Gain-Bandwidth Product | 100 kHz - sufficient for DC–10 kHz sensor signal conditioning without excessive power penalty |
| ESD Tolerance | 500 V HBM - requires ESD-safe handling but avoids need for external protection in controlled assembly |
Pinout & Package
LMC6042IM is housed in an 8-pin SOIC package (Package Drawing D), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant matte tin (SN) lead finish, JEDEC MS-012 AA compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (Amp A) | High-impedance node requiring guard ring layout to preserve <2 fA bias current performance |
| 2 | Non-Inverting Input (Amp A) | Accepts common-mode voltages down to −0.1 V - enables ground-sensing in single-supply configurations |
| 3 | Output (Amp A) | Rail-to-rail capable; drives ≥100 kΩ load to within 13 mV of V− and 130 mV of V+ |
| 4 | V− (Ground for single supply) | Reference for both amplifiers; must be low-impedance to maintain PSRR >62 dB |
| 5 | Non-Inverting Input (Amp B) | Independent high-Z input; usable for differential sensing or reference buffering |
| 6 | Inverting Input (Amp B) | Matches Amp A characteristics; supports matched dual-channel instrumentation designs |
| 7 | Output (Amp B) | Functionally identical to Pin 3; enables dual-channel signal paths without cross-talk >115 dB |
| 8 | V+ | Single-supply rail (4.5–15.5 V); supplies both amplifiers; thermal derating required above 85°C ambient |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | 2 fA typical - eliminates voltage error in GΩ-range feedback networks used with photodiodes and piezoelectrics |
| Rail-to-rail output with no pull-down resistor | Drives to within 13 mV of V− at 5 V supply - removes need for external level-shifting circuitry in low-voltage systems |
| Input common-mode range includes ground | Operates with VCM = 0 V - enables direct interfacing to grounded sensors (e.g., pH probes, silicon transducers) |
| Stable with capacitive loads using simple compensation | Supports >1000 pF loads via pull-up resistor or feed-forward capacitor - simplifies driving ADC input filters or long cables |
| Low quiescent current across voltage range | 26 μA total (both amps) at 15 V - maintains micropower operation even at maximum rated supply |
Applications
| Battery-Powered pH Monitoring | Photodiode Preamplification |
|---|---|
|
Use Scenario: Portable handheld pH meter measuring electrochemical potential of aqueous solutions using glass electrode. IC Role / Device Role / Timing Role: Buffer amplifier isolating high-impedance electrode (≥1012 Ω) from measurement circuitry while rejecting common-mode noise. Use Value: 2 fA input bias prevents electrode polarization drift; rail-to-rail output maximizes ADC utilization across 0–14 pH range. |
Use Scenario: Low-light detection in smoke/fire sensors using reverse-biased silicon photodiode. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent (pA–nA) into measurable voltage with minimal dark-current error. Use Value: Ultra-low input current avoids signal corruption; 100 kHz GBW supports pulse-modulated light sources up to 10 kHz. |
| Silicon Pressure Transducer Interface | Hand-Held Analytic Instrumentation |
|
Use Scenario: Battery-operated pressure gauge using Wheatstone bridge silicon sensor with mV-level output. IC Role / Device Role / Timing Role: Precision instrumentation amplifier front-end (two-op-amp topology) providing gain of 100–1000 with <20 μA total supply current. Use Value: Matched dual amplifiers enable CMRR trim; input range including ground accommodates bridge mid-point referencing. |
Use Scenario: Field-deployable gas chromatograph detector with microcontroller-based signal processing. IC Role / Device Role / Timing Role: Dual-channel signal conditioner for thermistor and electrochemical sensor inputs in same enclosure. Use Value: Single 5 V supply powers both channels; SOIC-8 footprint minimizes PCB area; −40°C to +85°C rating ensures outdoor reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual micropower op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC6042AIM/NOPB | Same die, higher-grade A-grade specification: tighter VOS (1 mV typ vs 3 mV), lower TCVOS (1.3 μV/°C vs 2.5 μV/°C) | Required for precision DC measurements where offset drift dominates error budget | Select LMC6042AIM/NOPB when VOS stability over temperature is critical; otherwise LMC6042IM suffices for general micropower buffering |
| LTC1050CS8#PBF | Zero-drift auto-zero architecture; 0.5 μV VOS (max), but 85 μA supply current - 4× higher than LMC6042IM | Used where ultra-low offset outweighs battery life; unsuitable for multi-year coin-cell operation | Choose LTC1050CS8#PBF only if sub-microvolt offset is mandatory; LMC6042IM offers optimal trade-off for >1-year battery life |
Compared with LMC6042AIM/NOPB, the LMC6042IM trades minor VOS/TCVOS degradation for cost efficiency while retaining identical pinout, package, and core micropower performance; versus LTC1050CS8#PBF, it delivers 4× lower supply current at the expense of initial offset, making it superior for energy-constrained field instruments.
Availability
LMC6042IM is available at Aetrix Electronics and suitable for battery monitoring, photodiode preamplification, and silicon transducer interface applications requiring stable component supply across industrial and medical OEM programs.
Supply support for LMC6042IM 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 analog ICs.
The LMC6042IM belongs to TI's LMC60xx micropower op-amp family, engineered specifically for ultra-low-power, high-impedance sensor signal conditioning in portable and remote instrumentation.
FAQ
What is the maximum operating supply voltage for the LMC6042IM?
The LMC6042IM supports a supply voltage range of 4.5 V to 15.5 V under operating conditions. Absolute maximum rating is 16 V, but continuous operation above 15.5 V risks reliability degradation. At 15 V supply, output swing reaches 14.85 V (min) into 25 kΩ load, and supply current remains within 56 μA (max) for both amplifiers.
Does the LMC6042IM support true rail-to-rail input common-mode range?
No - the LMC6042IM features rail-to-rail *output* swing and an input common-mode range that *includes ground*, but does not extend to V+. Per datasheet, the input common-mode voltage range is −0.1 V (min) to V+−2.3 V (min) at room temperature. This allows ground-referenced sensor interfacing but requires input signals to stay ≥2.3 V below V+.
Can the LMC6042IM drive capacitive loads directly without external components?
The LMC6042IM is not unconditionally stable with direct capacitive loads >100 pF. Datasheet Figure 27 shows phase margin erosion beyond this point. Stable operation requires either a series isolation resistor (e.g., 100 Ω) before the load, a pull-up resistor to V+, or feed-forward compensation (Cf) across the feedback network - as detailed in Applications Hints section.
What is the guaranteed input bias current specification for LMC6042IM over temperature?
The LMC6042IM guarantees input bias current ≤4 pA (max) across the full −40°C to +85°C operating junction temperature range. At 25°C, typical value is 0.002 pA (2 fA); the 4 pA limit ensures predictable leakage in high-impedance circuits even at elevated temperatures, critical for pH probe and electrometer designs.
Is the LMC6042IM pin-compatible with other members of the LMC60xx family?
Yes - the LMC6042IM shares identical SOIC-8 pinout and footprint with LMC6042AIM/NOPB, LMC6042IN/NOPB (PDIP), and LMC6041/LMC6044 variants in matching packages. However, LMC6041 (single) and LMC6044 (quad) have different pin counts and layouts; only same-channel-count devices (e.g., LMC6042AIM/NOPB) are drop-in replacements.
LMC6042IM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Push-Pull, Rail-to-Rail
- Slew Rate:
- 0.02V/µs
- Gain Bandwidth Product:
- 100 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.002 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 26µA (x2 Channels)
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 15.5 V
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LMC6042IM FAQ
1.How can I place an order for LMC6042IM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC6042IM 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 LMC6042IM reliable?
The price and inventory of LMC6042IM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC6042IM is usually 5 days.
3.What payment methods are accepted for LMC6042IM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC6042IM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC6042IM?
LMC6042IM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC6042IM 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 LMC6042IM?
For technical support, including LMC6042IM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC6042IM requirements.
6.How does Aetrix verify that LMC6042IM is sourced from the original manufacturer or authorized distributors?
All LMC6042IM 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 LMC6042IM meets industry standards.
7.What is the process for return or replacement of LMC6042IM?
All LMC6042IM units undergo pre-shipment inspection (PSI). If there is an issue with LMC6042IM, 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 LMC6042IM part is unused and in its original packaging.
Return procedure for LMC6042IM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMC6042IM 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…
