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Analog Devices Inc. LT1368CS8#PBF
- Part No.:
- LT1368CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1368CS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,236
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Product details
Overview
LT1368CS8#PBF from Analog Devices (formerly Linear Technology) is a dual precision rail-to-rail input/output operational amplifier optimized for low-voltage, high-accuracy signal conditioning. It delivers 475 µV max input offset voltage (25°C), 90 dB common-mode rejection over full rail-to-rail input range, and 0.065 V/µs slew rate while operating from 1.8 V to ±15 V supplies. Its 0.1 µF output capacitor–based compensation enables superior supply rejection-105 dB at DC-and reduced high-frequency output impedance, making it ideal for driving ADCs in mixed-signal systems.
For engineers reviewing the LT1368CS8#PBF datasheet, LT1368CS8#PBF pinout, LT1368CS8#PBF application, or LT1368CS8#PBF equivalent, this page provides verified pin configuration, rail-to-rail I/O behavior under 3 V/5 V/±15 V operation, capacitive-load stability requirements (CL = 0.1 µF), and validated alternatives for precision sensing and data acquisition designs.
Technical Context
The LT1368CS8#PBF employs a dual-input-stage architecture-comprising PNP and NPN differential pairs-switched by a comparator to maintain rail-to-rail common-mode input range (VEE to VCC). This design eliminates input clamps and ensures continuous operation across the full supply range without phase reversal.
Its output stage uses complementary Darlington pairs with local feedback capacitors (C1/C2) to achieve rail-to-rail swing and lower high-frequency output impedance. The mandatory 0.1 µF output capacitor serves as both compensation element and supply noise filter, improving PSRR by >20 dB above 10 kHz versus the LT1366/LT1367 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage (max) | 475 µV at 25°C - ensures ≤0.05% gain error in 10-bit precision sensor interfaces |
| Common-Mode Rejection Ratio | 90 dB over full rail-to-rail input - maintains accuracy when amplifying signals near supply rails |
| Supply Current per Amplifier | 375 µA typical - enables ultra-low-power operation in battery-powered instrumentation |
| Gain-Bandwidth Product | 160 kHz - supports stable unity-gain buffering of DC–100 kHz sensor outputs |
| Slew Rate | 0.065 V/µs - sufficient for settling 12-bit steps in ≥3 µs with minimal distortion |
| Output Swing (RL = 10 kΩ) | VOL = 12 mV above VEE; VOH = VCC – 4 mV - delivers true rail-to-rail dynamic range |
| PSRR (DC) | 105 dB - rejects supply ripple critical in shared analog/digital power domains |
Pinout & Package
LT1368CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard dual op amp pinout and JEDEC MS-012AC footprint (5.0 mm × 6.2 mm, 1.27 mm pitch).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Capacitor-coupled output requiring 0.1 µF to V– for stability and PSRR enhancement |
| 2 (–IN A) | Inverting input A | High-impedance node; bias current ≤10 nA enables high-Z sensor interfacing |
| 3 (+IN A) | Non-inverting input A | Supports rail-to-rail common-mode range (VEE to VCC); no external clamping needed |
| 4 (V–) | Negative supply | Reference for output capacitor (0.1 µF) and return path for load current up to 30 mA |
| 5 (+IN B) | Non-inverting input B | Independent channel with identical rail-to-rail input behavior and matching specs |
| 6 (–IN B) | Inverting input B | Matched to Channel A within 250 µV offset shift - enables precision differential gain stages |
| 7 (OUT B) | Amplifier B output | Functionally identical to Pin 1; shares same compensation requirement and drive capability |
| 8 (V+) | Positive supply | Accepts 1.8 V to 36 V single or ±15 V dual supply; powers internal bias networks and output stage |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-supply utilization in 3 V systems - e.g., direct interfacing to 0–3.3 V ADC references |
| 0.1 µF output capacitor compensation | Reduces high-frequency output impedance by >10× and improves PSRR >20 dB at 50 kHz |
| Low input offset drift | 2 µV/°C max - limits thermal-induced error to <100 µV over 0°C to 70°C industrial range |
| 1.8 V minimum supply operation | Supports single-cell Li-ion (3.0 V) and two-cell alkaline (3.2 V) battery-powered portable instruments |
| ESD protection | 4 kV HBM on all pins - eliminates need for external transient suppression in board-level ESD testing |
Applications
| ADC Driver Circuit | Low-Voltage Sensor Signal Conditioning |
|---|---|
Use Scenario: Driving the input of a 12-bit SAR ADC in a battery-powered environmental monitor. IC Role / Device Role / Timing Role: Precision buffer isolating thermistor bridge output from ADC sampling capacitance; configured as unity-gain follower. Use Value: 0.1 µF output capacitor suppresses switching noise from shared digital supply, reducing THD+N by 15 dB at 1 kHz and enabling accurate 12-bit code resolution. |
Use Scenario: Amplifying output of a 100 mV full-scale MEMS pressure sensor in a wearable health device. IC Role / Device Role / Timing Role: Dual-channel instrumentation amplifier front-end (gain = 10) with matched offset and CMRR. Use Value: Rail-to-rail input accepts 0–100 mV sensor swing referenced to ground; 475 µV max VOS contributes <0.5% of full-scale error at 10× gain. |
| Single-Supply Current Sensing | Mixed-Signal Power Supply Monitoring |
Use Scenario: Measuring load current in a 3.3 V IoT node using a 50 mΩ shunt resistor. IC Role / Device Role / Timing Role: High-side current sense amplifier with reference bias network; configured as difference amplifier. Use Value: Input common-mode range includes V+ (3.3 V), enabling direct sensing at positive rail; 90 dB CMRR rejects supply noise during RF transmission bursts. |
Use Scenario: Monitoring ripple on a switching DC/DC converter output feeding both analog and digital subsystems. IC Role / Device Role / Timing Role: Low-noise post-regulator buffer for clean analog supply; output filtered via 0.1 µF capacitor. Use Value: 105 dB PSRR attenuates 100 kHz switching noise by >100,000×; rail-to-rail output drives LDO enable inputs across full 0–3.3 V range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual precision rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1366CS8#PBF | No external capacitor required; 400 kHz GBW vs 160 kHz; higher slew rate (0.13 V/µs) | Better for wideband AC coupling; unsuitable where 0.1 µF filtering is needed for PSRR | Select LT1366CS8#PBF when bandwidth >200 kHz is required and supply noise is low |
| AD8602ARZ | Fully rail-to-rail I/O; 0.25 µV/°C drift; no external capacitor; 8 MHz GBW; CMRR = 95 dB | Higher precision and speed but lacks LT1368's intentional 0.1 µF PSRR optimization | Select AD8602ARZ for ultra-low-drift DC applications where supply filtering is handled externally |
Compared with LT1366CS8#PBF and AD8602ARZ, LT1368CS8#PBF uniquely trades bandwidth for enhanced supply noise immunity via its integrated 0.1 µF compensation strategy-making it the preferred choice when driving ADCs from noisy switchers or sharing supplies with digital ICs.
Availability
LT1368CS8#PBF is available at Aetrix Electronics and suitable for precision data acquisition, battery-powered instrumentation, and industrial sensor interface applications requiring stable component supply, long-term lifecycle support, and guaranteed lead-free compliance.
Supply support for LT1368CS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and control.
The LT1368CS8#PBF belongs to Linear Technology's legacy rail-to-rail precision op amp family, designed specifically for applications demanding wide supply range, low offset, and robust performance in noisy, low-voltage environments.
FAQ
What is the required output capacitor value for stable operation of the LT1368CS8#PBF?
The LT1368CS8#PBF requires a 0.1 µF ceramic capacitor connected between Pin 1 (OUT A) and Pin 4 (V–), and another between Pin 7 (OUT B) and Pin 4 (V–). This capacitor is mandatory for internal compensation, improves PSRR above 10 kHz, and reduces high-frequency output impedance. Omitting it causes instability and degraded noise performance in the LT1368CS8#PBF.
Can the LT1368CS8#PBF operate from a single 3.3 V supply?
Yes, the LT1368CS8#PBF is fully specified for single-supply operation down to 1.8 V. At 3.3 V, it maintains rail-to-rail input (0 V to 3.3 V) and output (≤12 mV above 0 V and ≤4 mV below 3.3 V), 475 µV max input offset, and 375 µA supply current per amplifier - making it ideal for low-voltage portable instrumentation using the LT1368CS8#PBF.
How does the LT1368CS8#PBF differ from the LT1366CS8#PBF in terms of stability and noise?
The LT1368CS8#PBF uses 0.1 µF output capacitors to improve PSRR and reduce high-frequency output impedance, whereas the LT1366CS8#PBF is stable with capacitive loads ≤1000 pF and has no capacitor requirement. As a result, the LT1368CS8#PBF exhibits ~10× better 50 kHz supply rejection and lower broadband noise when driving ADCs - a key differentiator confirmed in the LT1368CS8#PBF datasheet Figures 4a/4b.
Is the LT1368CS8#PBF pin-compatible with standard dual op amp footprints?
Yes, the LT1368CS8#PBF uses the industry-standard 8-lead SOIC (S8) package with the conventional dual op amp pinout: OUT A (1), –IN A (2), +IN A (3), V– (4), +IN B (5), –IN B (6), OUT B (7), V+ (8). It is mechanically and electrically compatible with SOIC-8 layouts used for LM358, TL072, and LT1366CS8#PBF - though circuit design must accommodate its 0.1 µF output capacitor requirement.
What is the maximum load current the LT1368CS8#PBF can drive while maintaining rail-to-rail output swing?
The LT1368CS8#PBF guarantees rail-to-rail output swing into 10 kΩ loads. For heavier loads, output swing degrades: at ISINK = 2.5 mA, VOL = 200 mV above V– (typical); at ISOURCE = 2.5 mA, VOH = V+ – 150 mV (typical). The absolute maximum continuous output current is ±30 mA, but sustained >10 mA loads require thermal consideration due to SOIC package limitations in the LT1368CS8#PBF.
LT1368CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.065V/µs
- Gain Bandwidth Product:
- 160 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 370µA (x2 Channels)
- Current - Output / Channel:
- 75 mA
- Voltage - Supply Span (Min):
- 1.8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1368CS8#PBF FAQ
1.How can I place an order for LT1368CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1368CS8#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 LT1368CS8#PBF reliable?
The price and inventory of LT1368CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1368CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1368CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1368CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1368CS8#PBF?
LT1368CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1368CS8#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 LT1368CS8#PBF?
For technical support, including LT1368CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1368CS8#PBF requirements.
6.How does Aetrix verify that LT1368CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1368CS8#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 LT1368CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1368CS8#PBF?
All LT1368CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1368CS8#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 LT1368CS8#PBF part is unused and in its original packaging.
Return procedure for LT1368CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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