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Analog Devices Inc. LT1635CS8#TRPBF
- Part No.:
- LT1635CS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1635CS8#TRPBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:6,940
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Product details
Overview
LT1635CS8#TRPBF 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 features 175kHz gain bandwidth and 30ppm/°C reference drift. It is used in battery-powered sensor conditioning and precision voltage regulation.
For engineers reviewing the LT1635CS8#TRPBF datasheet, LT1635CS8#TRPBF pinout, LT1635CS8#TRPBF application, or LT1635CS8#TRPBF equivalent, key selection criteria include guaranteed 1.2V operation, industry-standard LM10 pinout compatibility, rail-to-rail output swing within 15mV of rails (no load), 1000pF capacitive load drive capability, and floating-mode operation support via shunt gain configuration.
Technical Context
The LT1635CS8#TRPBF integrates two independent functional blocks: a rail-to-rail output op amp with phase reversal protection and input common mode range including ground, and a buffered 200mV reference referred to V– with 45–90V/mV amplifier gain. The op amp is unity-gain stable up to 1000pF load capacitance and achieves 175kHz gain bandwidth at 1kHz.
Reference performance is specified over industrial temperature range (–40°C to +85°C), with 30ppm/°C drift, 20ppm/V line regulation, and 150ppm/mA load regulation. The device supports floating-mode operation where the output connects to V+, enabling shunt regulator configurations with 8–25V/mV gain depending on supply and load conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 14V total (single or dual); enables direct use in 1.5V alkaline, 2.4V Li-ion, or ±5V systems |
| Supply Current | 130µA typical; allows >1-year operation on 100mAh coin cell in always-on sensor nodes |
| Op Amp GBW | 175kHz; supports DC–10kHz signal conditioning without stability issues at unity gain |
| Rail-to-Rail Output Swing | Within 15mV of rails (no load); ensures full dynamic range utilization in low-voltage ADC interfaces |
| Reference Voltage | 200mV ±11mV (189–211mV); serves as precise, low-drift feedback node for shunt regulators and current sources |
| Reference Drift | 30ppm/°C max; contributes <±0.25mV error over –40°C to +85°C for 200mV reference |
| Capacitive Load Drive | Stable with up to 1000pF; eliminates need for external isolation resistors in RC-filtered sensor outputs |
Pinout & Package
LT1635CS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with industry-standard LM10 pinout and 1.27mm lead pitch. Thermal resistance θJA = 190°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF FB) | Reference feedback input | Connects to internal 200mV bandgap; sets reference amplifier output when used in 2-terminal regulator configurations |
| 2 (OP AMP IN –) | Inverting input | Phase-reversal protected; accepts inputs down to V– – 0.4V without false output transitions |
| 3 (OP AMP IN +) | Non-inverting input | Input common mode includes ground; enables single-supply transducer interfacing with 0V reference |
| 4 (V–) | Negative supply rail | Reference point for 200mV bandgap; must be connected even in single-supply operation (0V) |
| 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 down to 1.2V with full functionality |
| 7 (OP AMP OUT) | Amplifier output | Drives ±20mA; swings rail-to-rail and sustains stability with 1000pF load |
| 8 (REFOUT) | Reference output | Buffered 200mV output; sources 2mA, sinks 10µA; used for biasing, feedback, or as precision low-voltage reference |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 130µA supply current enables multi-year battery life in portable instrumentation and IoT edge sensors |
| Rail-to-rail output stage | Swings to within 15mV of V– and V+ with no load, maximizing usable voltage range in 1.2V–5V systems |
| Integrated precision reference | 200mV bandgap with 30ppm/°C drift and buffered output eliminates need for external reference ICs |
| LM10-compatible pinout | Direct drop-in replacement for legacy LM10 designs without PCB layout changes or component requalification |
| Floating-mode capability | Shunt gain mode (output tied to V+) enables high-side current sensing and 2-terminal shunt regulator topologies |
Applications
| Battery-Level Indicator | Precision Current Regulator |
|---|---|
Use Scenario: Monitoring voltage of 3.6V Li-ion or 9V alkaline battery in handheld medical devices. IC Role / Device Role / Timing Role: LT1635CS8#TRPBF op amp compares battery voltage against internal 200mV reference; reference buffer provides stable threshold. Use Value: Delivers ±0.5% accuracy over temperature using only one IC, eliminating external voltage dividers and trimming components. | Use Scenario: Providing stable 10mA excitation current to RTD or strain gauge in industrial process sensors. IC Role / Device Role / Timing Role: LT1635CS8#TRPBF configured as 2-terminal shunt regulator with R1/R2 feedback network; op amp drives pass transistor. Use Value: Achieves <50ppm/°C total current drift using integrated reference, reducing calibration labor and BOM count by 3 parts. |
| Sensor Signal Conditioning | Low-Voltage Voltage Regulator |
Use Scenario: Amplifying mV-level output from thermocouples or piezoresistive pressure sensors in portable test equipment. IC Role / Device Role / Timing Role: LT1635CS8#TRPBF op amp provides gain and level-shifting; reference supplies bias for AC-coupled stages. Use Value: Input common mode includes ground and rail-to-rail output enable full-scale digitization of 0–100mV signals with 5V ADCs. | Use Scenario: Generating stable 3.0V or 3.3V supply from 3.6V Li-ion battery in wearables and BLE modules. IC Role / Device Role / Timing Role: LT1635CS8#TRPBF configured as adjustable shunt regulator with external resistors; reference defines feedback node. Use Value: Supports dropout as low as 200mV (VIN – VOUT) while maintaining regulation, extending usable battery life by 15%. |
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#TRPBF | Dual micropower rail-to-rail op amp (50µA per amp); no integrated reference; 200kHz GBW | Requires external reference for regulator/sensor bias; better for dual-channel signal paths than single-channel reference-integrated use | Select when dual amplifiers are needed and reference can be sourced separately; not suitable for space-constrained single-IC shunt regulators |
| LT1078CN8#PBF | Single micropower op amp (17µA); no reference; 70µV max VOS; 85kHz GBW; PDIP only | Lacks reference buffer and 200mV bandgap; requires external precision reference for regulation tasks | Choose for ultra-low-offset, low-power op amp needs where reference is already available; incompatible with LT1635CS8#TRPBF's shunt regulator topology |
Compared with LT1490ACS8#TRPBF and LT1078CN8#PBF, the LT1635CS8#TRPBF uniquely combines micropower consumption, rail-to-rail operation, and an integrated 200mV reference in one SO-8 package-enabling compact, low-component-count solutions for battery-powered regulation and sensor front-ends where reference integration reduces system error and board area.
Availability
LT1635CS8#TRPBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, precision sensor interfaces, and low-voltage power management requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for LT1635CS8#TRPBF 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 LT1635 product line was designed to address ultra-low-power, single-chip analog signal conditioning needs in portable and energy-harvesting systems-integrating op amp, reference, and buffer to eliminate discrete reference ICs and reduce design complexity.
FAQ
What is the minimum operating supply voltage for LT1635CS8#TRPBF?
The LT1635CS8#TRPBF is guaranteed to operate from a single 1.2V supply over the full industrial temperature range (–40°C to +85°C). At this voltage, the op amp functions fully, though the reference requires ≥1.3V to maintain specified drift and regulation performance. Below 1.3V, the reference may exhibit increased drift or reduced load capability, but the op amp remains functional.
Can LT1635CS8#TRPBF drive capacitive loads without oscillation?
Yes, the LT1635CS8#TRPBF is unity-gain stable with capacitive loads up to 1000pF, as confirmed in the datasheet's "Capacitive Load Handling" graph (G12). This eliminates the need for series isolation resistors in applications like RC-filtered sensor outputs or DAC buffers, simplifying layout and preserving signal integrity in low-frequency precision circuits.
How does the BALANCE pin function in LT1635CS8#TRPBF?
The BALANCE pin (Pin 5) of the LT1635CS8#TRPBF provides offset voltage adjustment by accepting a variable voltage-typically derived from the REFOUT pin via a potentiometer. It enables trimming of input offset voltage over an asymmetrical range of approximately –2mV to +8mV, allowing zero-offset calibration at room temperature and compensation for thermal drift in critical DC-coupled applications.
Is LT1635CS8#TRPBF pin-compatible with LM10?
Yes, the LT1635CS8#TRPBF uses the industry-standard LM10 pinout (REFOUT, IN–, IN+, V–, BALANCE, V+, OUT, REF FB), enabling direct drop-in replacement in existing LM10-based designs. No PCB layout changes are required, and all functional pins map identically-though the LT1635CS8#TRPBF adds enhanced specifications including lower supply current, wider supply range, and improved reference performance.
What is the maximum load current the LT1635CS8#TRPBF reference buffer can source?
The LT1635CS8#TRPBF reference buffer can source up to 2mA of load current while maintaining specified accuracy and drift over the industrial temperature range (–40°C to +85°C). It can also sink up to 10µA, making it suitable for biasing low-current circuits, driving ADC reference inputs, or setting thresholds in comparator applications without external amplification.
LT1635CS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LT1635CS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1635CS8#TRPBF 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#TRPBF reliable?
The price and inventory of LT1635CS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1635CS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LT1635CS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1635CS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1635CS8#TRPBF?
LT1635CS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1635CS8#TRPBF 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#TRPBF?
For technical support, including LT1635CS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1635CS8#TRPBF requirements.
6.How does Aetrix verify that LT1635CS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LT1635CS8#TRPBF 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#TRPBF meets industry standards.
7.What is the process for return or replacement of LT1635CS8#TRPBF?
All LT1635CS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1635CS8#TRPBF, 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#TRPBF part is unused and in its original packaging.
Return procedure for LT1635CS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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