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Analog Devices Inc. LTC6242HGN#PBF
- Part No.:
- LTC6242HGN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
LTC6242HGN#PBF.pdf
- Description:
- IC CMOS 4 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
LTC6242HGN#PBF from Analog Devices (formerly Linear Technology) is a quad, rail-to-rail output, low-noise CMOS operational amplifier optimized for precision signal conditioning in high-impedance sensor interfaces. It delivers 18MHz gain bandwidth, 550nVP-P 0.1Hz–10Hz noise, 150μV max input offset voltage (–40°C to 125°C), and 1pA max input bias current - enabling accurate amplification of weak signals in medical instrumentation and photodiode front-ends.
For engineers reviewing the LTC6242HGN#PBF datasheet, LTC6242HGN#PBF pinout, LTC6242HGN#PBF application, or LTC6242HGN#PBF equivalent, key selection criteria include guaranteed H-grade temperature operation (–40°C to 125°C), rail-to-rail output swing within 30mV of rails, low 1.8mA/amplifier supply current at 5V, and compatibility with 2.8V–6V single-supply or ±2.5V dual-supply systems.
Technical Context
The LTC6242HGN#PBF implements a unity-gain-stable CMOS input stage with 1012Ω input resistance and 3.5pF differential input capacitance, supporting high-Z transducer interfacing without stability degradation. Its output stage uses complementary common-drain topology to achieve rail-to-rail swing while maintaining 10V/μs slew rate and 0.53MHz full-power bandwidth at 3VP-P.
Designed for operation across –40°C to 125°C, it specifies critical parameters over this full range: input offset drift ≤2.5μV/°C, CMRR ≥78dB (0V ≤ VCM ≤ 3.5V), PSRR ≥78dB, and large-signal voltage gain ≥200V/mV into 10kΩ load - ensuring consistent performance in automotive under-hood and industrial control environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 18MHz - supports stable closed-loop gain ≥10 at 1.8MHz or ≥2 at 9MHz for anti-aliasing filter design. |
| Input Offset Voltage | 150μV max (–40°C to 125°C) - enables ≤0.03% error in 0.5V full-scale 16-bit ADC front-end without trimming. |
| 0.1Hz–10Hz Noise | 550nVP-P - preserves resolution in DC-coupled EEG or strain gauge measurements below 10Hz. |
| Input Bias Current | 1pA max (–40°C to 125°C) - prevents >1mV error when amplifying signals from 1GΩ photodiodes or piezoelectric sensors. |
| Supply Range | 2.8V to 6V single supply - operates from Li-ion battery (3.0–4.2V) or regulated 3.3V/5V rails without level-shifting. |
| Output Swing | Within 30mV of rails - maximizes dynamic range in low-voltage data acquisition systems (e.g., 3.3V ADC with 0–3.3V input). |
| Channel Matching | VOS match ≤400μV - allows precise differential measurement using two channels as matched pair in instrumentation amps. |
Pinout & Package
The LTC6242HGN#PBF is housed in a 16-lead plastic SSOP (GN) package with exposed pad thermal enhancement. Pin 1 is marked by a dot; pin numbering follows standard SSOP convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; rail-to-rail swing supports direct interface to SAR ADC reference buffers. |
| 2 (–IN A) | Inverting input A | High-impedance node; requires guard ring layout to minimize leakage-induced offset drift. |
| 3 (+IN A) | Non-inverting input A | Accepts high-Z sensor signals; 3.5pF input capacitance sets bandwidth limit with source impedance. |
| 4 (V+) | Positive supply | Connects to 2.8–6V rail; decoupling capacitor required within 5mm for stability. |
| 5 (+IN B) | Non-inverting input B | Independent channel input; identical specs to Pin 3 enable synchronous multi-channel sampling. |
| 6 (–IN B) | Inverting input B | Matches Pin 2 characteristics; supports differential input configuration with A-channel. |
| 7 (OUT B) | Amplifier B output | Electrically isolated from OUT A; enables dual-path signal processing on single IC. |
| 8 (NC) | No connect | Internal die pad; must remain unconnected or grounded per layout guidelines. |
| 9 (OUT D) | Amplifier D output | Fourth independent output; shares same electrical specs as OUT A/B/C for scalable analog front-ends. |
| 10 (–IN D) | Inverting input D | Provides fourth high-impedance input; matches Pin 2/6 for consistent multi-channel design. |
| 11 (+IN D) | Non-inverting input D | Enables four-channel sensor readout without inter-channel crosstalk (typical isolation >100dB @ 1kHz). |
| 12 (V–) | Negative supply / ground | Reference for single-supply operation; connects to system ground or negative rail in dual-supply mode. |
| 13 (+IN C) | Non-inverting input C | Third channel input; identical AC/DC specs allow time-multiplexed sampling across all four amplifiers. |
| 14 (–IN C) | Inverting input C | Matches Pin 2/6/10; supports precision difference amplification using C- and D-channels. |
| 15 (OUT C) | Amplifier C output | Completes quad architecture; enables simultaneous excitation and sensing in bridge-based transducer systems. |
| 16 (NC) | No connect | Internal test pad; leave floating or tie to V– per manufacturer recommendation. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full 2.74Vpp output at 3.3V supply, maximizing SNR in low-voltage data converters. |
| Ultra-low input bias current | 1pA max over –40°C to 125°C eliminates guard ring complexity in pH meter and ion-selective electrode circuits. |
| Low 0.1Hz–10Hz noise | 550nVP-P enables sub-μV resolution in DC-coupled biosignal amplifiers without chopper stabilization. |
| H-grade temperature rating | Guaranteed parametric performance from –40°C to 125°C supports under-hood automotive and industrial motor control applications. |
| Quad-channel integration | Four matched amplifiers in one SSOP package reduce PCB area by 75% vs discrete SO-8 op-amps in multi-sensor systems. |
Applications
| Photodiode Amplifier | Medical ECG Front-End |
|---|---|
Use Scenario: Amplifying nanoamp-level photocurrent from silicon PIN diodes in pulse oximetry sensors. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1GΩ feedback resistor; provides DC-coupled gain while rejecting ambient light interference. Use Value: 1pA input bias current prevents >1mV output error, and 550nVP-P low-frequency noise preserves heartbeat waveform fidelity. | Use Scenario: Conditioning biopotential signals from dry electrodes in portable ECG monitors. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier driver with high common-mode rejection and low power consumption. Use Value: Rail-to-rail output swing fully utilizes 3.3V ADC range, while 150μV offset ensures <0.05% baseline error in 300mV ECG amplitude. |
| Strain Gauge Bridge | Industrial Process Controller |
Use Scenario: Amplifying mV-level differential outputs from Wheatstone bridges in load cells and pressure sensors. IC Role / Device Role / Timing Role: Precision difference amplifier with matched input pairs (A/B and C/D channels) for ratiometric bridge excitation and sensing. Use Value: 400μV max channel-to-channel VOS match minimizes bridge imbalance errors, and 18MHz GBW supports active filtering up to 10kHz. | Use Scenario: Signal conditioning for 4–20mA loop-powered field transmitters in harsh factory environments. IC Role / Device Role / Timing Role: Sensor interface amplifier operating from 3.3V microcontroller rails with extended temperature reliability. Use Value: H-grade qualification (–40°C to 125°C) ensures stable 150μV offset and 1pA bias current in uncooled control cabinets near motors and drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad low-noise op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP4177ARUZ | Bipolar input (2nA IB), lower noise density (7.9nV/√Hz), but higher 0.1–10Hz noise (1.8μVP-P) and no rail-to-rail output. | Preferred in precision weigh scales requiring ultra-low voltage noise at >100Hz, but unsuitable for photodiode amps due to IB mismatch. | Select when wideband noise dominates system error budget and supply >±5V is available. |
| LTC6229IGN#PBF | Single-channel, 1.3pA IB, 12MHz GBW, same H-grade temp range and SSOP-16 package footprint. | Used where space-constrained designs require only one amplifier per board, avoiding unused channels and reducing quiescent current. | Choose for minimal footprint in point-of-load sensor nodes where quad integration isn't needed. |
Compared with OP4177ARUZ and LTC6229IGN#PBF, the LTC6242HGN#PBF uniquely combines quad integration, rail-to-rail output, sub-picoamp bias current, and guaranteed H-grade operation - making it optimal for compact, battery-powered, high-impedance multi-sensor systems requiring DC accuracy and low-frequency stability.
Availability
LTC6242HGN#PBF is available at Aetrix Electronics and suitable for medical instrumentation, industrial process controllers, and photodiode-based optical sensors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC6242HGN#PBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC6242 belongs to ADI's precision op amp product line, engineered specifically for low-noise, low-input-bias-current signal conditioning in high-impedance sensor interfaces and medical diagnostic equipment.
FAQ
What is the maximum input common-mode voltage range for LTC6242HGN#PBF at 5V supply?
At VS = 5V (V+ = 5V, V– = 0V), the LTC6242HGN#PBF guarantees an input common-mode voltage range of 0V to 3.5V. This is specified over the full –40°C to 125°C operating temperature range and ensures reliable operation when interfacing with sensors whose output spans near ground or mid-supply levels.
Does LTC6242HGN#PBF support dual-supply operation, and what are the limits?
Yes, LTC6242HGN#PBF supports dual-supply operation up to ±5V (total supply ≤10V). The absolute maximum total supply voltage is 7V for standard versions and 12V for HV variants; however, LTC6242HGN#PBF is a standard-voltage part rated for 2.8V–6V single supply or ±2.5V dual supply (5V total), with guaranteed specs at ±2.5V per the datasheet.
How does the input bias current of LTC6242HGN#PBF compare across temperature?
The LTC6242HGN#PBF guarantees ≤1pA maximum input bias current over its full –40°C to 125°C operating range. At 25°C, typical IB is 0.2pA, and the datasheet confirms worst-case remains ≤1pA even at 125°C - critical for maintaining accuracy in high-impedance pH probes and piezoelectric sensors deployed in hot environments.
Can LTC6242HGN#PBF drive capacitive loads directly, and what is the recommended compensation?
LTC6242HGN#PBF is unity-gain stable but exhibits reduced phase margin with capacitive loads >100pF. For loads >50pF, Analog Devices recommends isolating the output with a 10Ω–50Ω series resistor placed adjacent to the amplifier output pin. This maintains stability without degrading DC accuracy, as confirmed in the datasheet's "Driving Capacitive Loads" section.
What is the thermal resistance (θJA) of the LTC6242HGN#PBF in its SSOP package?
The LTC6242HGN#PBF in the 16-lead plastic SSOP (GN) package has a junction-to-ambient thermal resistance (θJA) of 135°C/W under standard JEDEC 2-layer board conditions. With proper PCB copper pour connected to the exposed pad, actual θJA can be reduced to ~60°C/W, enabling continuous operation at full 125°C ambient with 4 × 1.8mA supply current.
LTC6242HGN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 10V/µs
- Gain Bandwidth Product:
- 18 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.5 pA
- Voltage - Input Offset:
- 60 µV
- Current - Supply:
- 1.8mA (x4 Channels)
- Current - Output / Channel:
- 30 mA
- Voltage - Supply Span (Min):
- 2.8 V
- Voltage - Supply Span (Max):
- 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SSOP
LTC6242HGN#PBF FAQ
1.How can I place an order for LTC6242HGN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6242HGN#PBF 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 LTC6242HGN#PBF reliable?
The price and inventory of LTC6242HGN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6242HGN#PBF is usually 5 days.
3.What payment methods are accepted for LTC6242HGN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6242HGN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6242HGN#PBF?
LTC6242HGN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6242HGN#PBF 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 LTC6242HGN#PBF?
For technical support, including LTC6242HGN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6242HGN#PBF requirements.
6.How does Aetrix verify that LTC6242HGN#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6242HGN#PBF 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 LTC6242HGN#PBF meets industry standards.
7.What is the process for return or replacement of LTC6242HGN#PBF?
All LTC6242HGN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6242HGN#PBF, 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 LTC6242HGN#PBF part is unused and in its original packaging.
Return procedure for LTC6242HGN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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