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Analog Devices Inc. LT1635CS8#PBF
- Part No.:
- LT1635CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1635CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:831
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Product details
Overview
LT1635CS8#PBF from Analog Devices (formerly Linear Technology) is a micropower rail-to-rail operational amplifier with integrated 200mV precision bandgap reference and reference buffer in an 8-lead SOIC package. It operates from 1.2V single supply or ±5V dual supplies, draws only 130µA supply current, delivers ±20mA output current, and achieves 30ppm/°C reference drift - ideal for battery-powered sensor conditioning and portable instrumentation.
For engineers reviewing the LT1635CS8#PBF datasheet, LT1635CS8#PBF pinout, LT1635CS8#PBF application, or LT1635CS8#PBF equivalent, key selection considerations include its industry-standard LM10 pinout, guaranteed 1.2V operation, rail-to-rail output swing within 15mV of rails (no load), 175kHz gain-bandwidth product, and capability to drive 1000pF capacitive loads without instability.
Technical Context
The LT1635CS8#PBF integrates two independent functional blocks: a rail-to-rail output op amp with phase reversal protection and ground-sensing inputs, and a buffered 200mV reference referenced to V–. The op amp features unity-gain stability with up to 1000pF load capacitance and supports floating-mode operation via shunt gain configuration.
Reference functionality includes 200mV feedback sense voltage (pin 1 to pin 8), 150ppm/mA load regulation, 20ppm/V line regulation, and a reference amplifier gain of 45–90 V/mV - enabling precision voltage regulators, current sources, and battery-level indicators without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to ±5V total - enables ultra-low-voltage battery operation down to single-cell alkaline or NiMH. |
| Supply Current | 130µA typical - ensures multi-year runtime in coin-cell–powered systems. |
| Input Offset Voltage | 0.3–1.3mV (0°C to 70°C) - supports high-accuracy DC signal amplification without trimming. |
| Gain Bandwidth Product | 175kHz - sufficient for low-frequency sensor interfaces and precision regulator loops. |
| Output Drive Capability | ±20mA min - drives LEDs, MOSFET gates, or 500Ω loads directly. |
| Reference Drift | 30ppm/°C - maintains <±0.5mV error over –40°C to 85°C industrial range. |
| Capacitive Load Drive | Stable with up to 1000pF - eliminates need for isolation resistors in ADC driver or filter applications. |
Pinout & Package
LT1635CS8#PBF is housed in an 8-lead plastic SOIC (SO-8) package with industry-standard LM10 pinout and 1.27mm pitch. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF FB) | Reference Feedback Input | Connects to internal 200mV bandgap node; used to configure precision shunt or series regulators. |
| 2 (IN–) | Inverting Op Amp Input | Ground-sensing input with phase reversal protection; common-mode range includes V–. |
| 3 (IN+) | Non-inverting Op Amp Input | High-impedance input (7–35MΩ differential); supports sensor bridge or thermocouple interfaces. |
| 4 (V–) | Negative Supply Rail | Reference point for 200mV bandgap; must be connected even in single-supply configurations. |
| 5 (BALANCE) | Offset Null Adjustment | Accepts variable voltage (typically from REFOUT) to trim input offset voltage from –2mV to +8mV. |
| 6 (V+) | Positive Supply Rail | Bypass with 0.1µF capacitor; supports operation up to 14V total supply range. |
| 7 (OUT) | Op Amp Output | Rail-to-rail output capable of sourcing/sinking ±20mA; swings to within 15mV of rails (no load). |
| 8 (REFOUT) | Reference Output / Buffer | Provides buffered 200mV reference; sinks up to 10µA, sources up to 2mA across temperature. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | 130µA supply current enables >10-year battery life in 200mAh coin cells at 1% duty cycle. |
| Rail-to-Rail Output | Swings to within 15mV of V+ and V– with no load - maximizes dynamic range in low-voltage systems. |
| Integrated Precision Reference | 200mV bandgap + buffer achieves 30ppm/°C drift and 20ppm/V line regulation - replaces discrete reference ICs. |
| LM10-Compatible Pinout | Drop-in replacement for legacy LM10 designs - no PCB redesign required for upgrade paths. |
| Floating-Mode Capability | Shunt gain mode allows operation with output tied to V+, enabling high-side current sensing and floating regulators. |
Applications
| Battery-Level Indicator | Precision Current Regulator |
|---|---|
Use Scenario: Monitoring voltage of 3.6V Li-ion or 4.5V alkaline battery packs in handheld medical devices. IC Role / Device Role / Timing Role: LT1635CS8#PBF op amp compares battery voltage against buffered 200mV reference; reference sets precise trip threshold. Use Value: Achieves ±1% full-scale accuracy over –40°C to 85°C without calibration, reducing BOM count by eliminating external voltage dividers and references. | Use Scenario: Providing stable 10mA–100mA bias current for laser diodes or LED arrays in portable test equipment. IC Role / Device Role / Timing Role: LT1635CS8#PBF configured as 2-terminal shunt regulator using REFOUT and REF FB pins to set current via external resistor. Use Value: Delivers <±0.5% current accuracy over temperature with no external op amp or reference - reduces footprint by 40% vs discrete solutions. |
| Sensor Signal Conditioning | Low-Voltage Precision Regulator |
Use Scenario: Amplifying microvolt-level outputs from thermocouples or strain gauges in IoT environmental sensors. IC Role / Device Role / Timing Role: LT1635CS8#PBF op amp provides gain-of-100 instrumentation stage; integrated reference supplies excitation and reference for ratiometric ADCs. Use Value: Eliminates offset drift errors from separate reference ICs; input offset voltage drift of 3–7µV/°C ensures <10µV total error over 100°C span. | Use Scenario: Generating stable 3.0V or 3.3V supply from single 3.6V Li-ion cell in ultra-low-power microcontroller subsystems. IC Role / Device Role / Timing Role: LT1635CS8#PBF configured as series pass regulator with external P-MOSFET; reference sets output via resistor divider. Use Value: Maintains regulation down to 1.2V input - extends usable battery capacity by 15% compared to standard LDOs requiring ≥2.0V dropout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision micropower op amp and reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490ACS8#PBF | Dual micropower rail-to-rail op amp (50µA per amp); no integrated reference; 200kHz GBW. | Requires external reference for regulator/current source functions; better for dual-channel signal paths. | Select when dual op amp channels are needed and reference is already available on board. |
| LT1078CN8#PBF | Single micropower precision op amp (17µA); no reference; 70µV max VOS; 85kHz GBW. | Lacks reference buffer and 200mV bandgap - cannot replace LT1635CS8#PBF in shunt regulator or floating-mode circuits. | Select only for ultra-low-offset op amp needs where reference functionality is unnecessary. |
Compared with LT1490ACS8#PBF and LT1078CN8#PBF, the LT1635CS8#PBF uniquely combines op amp, reference, and buffer in one SO-8 package with LM10 pin compatibility - enabling single-component solutions for battery monitors, current sources, and low-voltage regulators that alternatives cannot replicate.
Availability
LT1635CS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial sensor nodes requiring stable component supply with long-term lifecycle support.
Supply support for LT1635CS8#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 acquired Linear Technology in 2017 and maintains full production and technical support for legacy Linear parts including the LT1635 family.
The LT1635 product line was designed specifically for ultra-low-power analog signal conditioning in space-constrained, battery-operated systems - integrating precision op amp and reference functions to reduce component count and improve system-level accuracy.
FAQ
What is the minimum operating supply voltage for LT1635CS8#PBF?
The LT1635CS8#PBF operates down to 1.2V total supply voltage (V+ to V–) across the industrial temperature range. For proper reference operation over –40°C to 85°C, the minimum supply is 1.3V. At 1.2V, the op amp remains fully functional with ground-sensing inputs and rail-to-rail output, but reference accuracy may degrade outside specified limits. Always verify performance under actual operating conditions using the LT1635CS8#PBF's absolute maximum ratings table.
Does LT1635CS8#PBF support single-supply operation?
Yes, the LT1635CS8#PBF is fully specified for true single-supply operation with V– = 0V and V+ = 5V. Its op amp input common-mode range includes ground, and the output swings to within 15mV of 0V (no load). The 200mV reference is referred to V–, making it inherently compatible with single-ended systems. This allows direct use in 3.3V or 5V microcontroller-based designs without level-shifting circuitry - a core design advantage of the LT1635CS8#PBF.
How is the offset voltage adjusted on LT1635CS8#PBF?
The LT1635CS8#PBF provides offset nulling via the BALANCE pin (Pin 5), which accepts a variable voltage derived from the REFOUT pin (Pin 8). Connecting a potentiometer between REFOUT and ground, with its wiper to BALANCE, enables adjustment from –2mV to +8mV. At room temperature, the typical input offset voltage (0.3–1.3mV) falls within this range, allowing zero-adjustment. This feature is documented in Figure 1 of the LT1635CS8#PBF datasheet and requires no external op amp - a key differentiator versus standard op amps.
Can LT1635CS8#PBF drive capacitive loads?
Yes, the LT1635CS8#PBF is unity-gain stable with capacitive loads up to 1000pF, as confirmed in the Typical Performance Characteristics (Figure G12). This eliminates the need for isolation resistors in ADC driver, filter, or cable-driving applications. However, for loads exceeding 1000pF, external compensation (e.g., series resistor at output) is recommended. The LT1635CS8#PBF's ability to drive such loads directly simplifies layout and improves signal integrity in precision analog front-ends.
What is the function of the REF FB pin on LT1635CS8#PBF?
The REF FB pin (Pin 1) is the feedback input for the internal 200mV bandgap reference amplifier. When connected to REFOUT (Pin 8), it configures the reference in unity-gain buffer mode. When used with external resistors, it enables programmable output voltages (e.g., 2.5V, 3.3V) in series or shunt regulator topologies. Its 200mV nominal sense voltage is factory-trimmed to ±5.5mV initial accuracy - a critical parameter enabling high-precision regulation without external trimming. This functionality is intrinsic to the LT1635CS8#PBF's architecture and not available in standalone op amps.
LT1635CS8#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:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.05V/µs
- Gain Bandwidth Product:
- 175 kHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 nA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 135µA
- Current - Output / Channel:
- 40 mA
- Voltage - Supply Span (Min):
- 1.2 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1635CS8#PBF FAQ
1.How can I place an order for LT1635CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1635CS8#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 LT1635CS8#PBF reliable?
The price and inventory of LT1635CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1635CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1635CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1635CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1635CS8#PBF?
LT1635CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1635CS8#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 LT1635CS8#PBF?
For technical support, including LT1635CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1635CS8#PBF requirements.
6.How does Aetrix verify that LT1635CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1635CS8#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 LT1635CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1635CS8#PBF?
All LT1635CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1635CS8#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 LT1635CS8#PBF part is unused and in its original packaging.
Return procedure for LT1635CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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