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Analog Devices Inc. LT1635CN8#PBF
- Part No.:
- LT1635CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1635CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:200
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Product details
Overview
LT1635CN8#PBF from Analog Devices (formerly Linear Technology) is a micropower rail-to-rail operational amplifier with integrated 200mV precision bandgap reference and reference buffer, operating from 1.2V single supply or ±5V dual supplies. It delivers 130µA supply current, 175kHz gain bandwidth, rail-to-rail output swing within 15mV of rails (no load), and 30ppm/°C reference drift - used in battery-powered sensor conditioning and low-voltage precision regulation.
For engineers reviewing the LT1635CN8#PBF datasheet, LT1635CN8#PBF pinout, LT1635CN8#PBF application, or LT1635CN8#PBF equivalent, key selection considerations include its industry-standard LM10 pinout, guaranteed operation at 1.2V, combined op amp + reference functionality on one die, and capability for floating-mode shunt regulator configurations.
Technical Context
The LT1635CN8#PBF integrates two independent functional blocks: a rail-to-rail output op amp with phase reversal protection and ground-sensing input stage, and a buffered 200mV bandgap reference referenced to V–. The op amp features unity-gain stability with up to 1000pF capacitive load and 20mA min output drive capability.
The reference block includes a dedicated feedback sense pin (REF FB, Pin 1) and output pin (REFOUT, Pin 8), enabling programmable voltage references via external resistor dividers. Its drift (30ppm/°C typ), line regulation (20ppm/V), and load regulation (150ppm/mA) are specified over –40°C to 85°C for the I-grade; the C-grade (LT1635CN8#PBF) is rated 0°C to 70°C with tighter initial accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 14V total (single or split); enables direct use in coin-cell and 2-cell Li-ion systems |
| Supply Current | 130µA typical; supports multi-year battery life in portable instrumentation |
| Gain Bandwidth Product | 175kHz; sufficient for DC-coupled sensor signal conditioning and slow-loop control |
| Reference Output | 200mV ±11mV (initial accuracy); stable low-voltage reference for precision current sources |
| Reference Drift | 30ppm/°C typical; ensures <±0.5mV drift over 0°C–70°C ambient range |
| Output Drive | 20mA minimum sink/source; drives 1000pF directly without external buffering |
| Input Offset Voltage | 0.3mV typical (25°C); trimmed for low-error DC amplification in precision measurement |
Pinout & Package
LT1635CN8#PBF uses an 8-lead PDIP (N8) package with industry-standard LM10 pinout, compatible with legacy designs and socket-based prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (REF FB) | Reference feedback input | Connects to REFOUT (Pin 8) to set 200mV reference; external resistors program higher output voltages |
| 2 (IN–) | Inverting op amp input | Accepts signals down to V– (ground in single-supply); includes phase reversal protection |
| 3 (IN+) | Non-inverting op amp input | Common-mode range includes V–; enables true single-supply sensor interfacing |
| 4 (V–) | Negative supply rail | Reference point for 200mV bandgap; must be stable for reference accuracy |
| 5 (BALANCE) | Offset null adjustment | Accepts variable voltage (e.g., from REFOUT) to trim input offset to zero |
| 6 (V+) | Positive supply rail | Bypass with 0.1µF capacitor; supports operation as low as 1.2V above V– |
| 7 (OUT) | Op amp output | Rail-to-rail swing: within 15mV of rails (no load); drives 10mA with <250mV drop |
| 8 (REFOUT) | Reference output | 200mV buffered output; sinks up to 10µA, sources up to 2mA over temperature |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 130µA supply current enables >10-year battery life in 20mAh coin cells |
| Rail-to-rail output | Swings to within 15mV of V– and V+ with no load - maximizes dynamic range in low-voltage systems |
| Integrated reference | 200mV bandgap + buffer eliminates need for external reference IC in current-source and shunt-regulator designs |
| LM10 pin compatibility | Drop-in replacement for legacy LM10 designs without PCB changes or layout rework |
| Floating-mode capability | Supports shunt regulator topologies where output connects to V+, enabling high-side current sensing |
Applications
| Battery-Level Indicator | Precision Current Regulator |
|---|---|
Use Scenario: Monitoring voltage of 3.6V Li-ion or 3V coin-cell batteries in portable medical devices. IC Role / Device Role / Timing Role: LT1635CN8#PBF op amp compares battery voltage against internal 200mV reference; reference buffer provides stable threshold. Use Value: Eliminates external voltage divider and reference IC, reducing BOM count by 3 components while maintaining ±1% full-scale accuracy over temperature. | Use Scenario: Generating precise 10mA constant current for LED biasing or sensor excitation in handheld test equipment. IC Role / Device Role / Timing Role: LT1635CN8#PBF configured as shunt regulator using REFOUT and REF FB pins to set reference voltage across sense resistor. Use Value: Achieves <0.5% current accuracy over 0°C–70°C without trimming, leveraging 30ppm/°C reference drift and 0.3mV input offset. |
| Sensor Signal Conditioning | Low-Voltage Voltage Regulator |
Use Scenario: Amplifying mV-level outputs from thermocouples or bridge sensors in industrial IoT nodes powered by energy harvesters. IC Role / Device Role / Timing Role: LT1635CN8#PBF op amp provides gain and level-shifting; reference buffers ADC reference or sets bias point. Use Value: Single-supply operation from 1.2V enables direct integration with ultra-low-power microcontrollers and RF transceivers. | Use Scenario: Generating stable 3.3V or 5V output from unregulated 3.6–5.5V input in wearables using minimal external components. IC Role / Device Role / Timing Role: LT1635CN8#PBF configured as series pass regulator with external PNP transistor and feedback divider from REFOUT. Use Value: Reduces quiescent current to 130µA versus >1mA for standard LDOs, extending runtime in always-on monitoring applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision micropower op amp + reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490ACS8#PBF | Dual micropower RRIO op amp (50µA/ch); no integrated reference; SO-8 package | Requires external reference IC for reference-dependent circuits; better for dual-channel signal paths | Select when dual op amps are needed and reference is already available on board |
| LT1078CN8#PBF | Single micropower precision op amp (17µA); no reference; 70µV max VOS; LM10 pinout | Lacks reference function entirely; requires separate reference for shunt/current-regulator use cases | Select only if reference functionality is unnecessary and ultra-low offset (<0.1mV) is critical |
Compared with LT1490ACS8#PBF and LT1078CN8#PBF, the LT1635CN8#PBF uniquely combines op amp and reference in one LM10-pin-compatible package - reducing component count and PCB area in space-constrained, battery-sensitive designs where both functions are required.
Availability
LT1635CN8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable sensor nodes, and low-voltage precision regulators requiring stable component supply across extended production lifecycles.
Supply support for LT1635CN8#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.
The LT1635CN8#PBF belongs to Linear's precision micropower analog building block family, designed specifically for ultra-low-power, single-supply systems where integration of reference and amplifier reduces system complexity and power consumption.
FAQ
What is the minimum supply voltage for LT1635CN8#PBF to operate fully across its specified temperature range?
The LT1635CN8#PBF operates from a minimum total supply voltage of 1.2V, guaranteed over the commercial temperature range (0°C to 70°C). For full reference functionality-including stable 200mV output and specified drift-the minimum supply is 1.3V. Below this, the reference may not regulate correctly, though the op amp remains functional down to 1.2V per the datasheet absolute minimum rating.
Can LT1635CN8#PBF be used in floating (high-side) shunt regulator configurations?
Yes, the LT1635CN8#PBF supports floating-mode operation as documented in the datasheet. By connecting the op amp output (Pin 7) to V+ and referencing the input to V–, it functions as a high-side current regulator. This configuration leverages the "shunt gain" parameter (15–25 V/mV) and enables precise current sourcing without ground-referenced sensing limitations.
What is the purpose of the BALANCE pin (Pin 5) on LT1635CN8#PBF?
The BALANCE pin (Pin 5) on LT1635CN8#PBF provides offset nulling capability. Applying a variable voltage-typically derived from the 200mV REFOUT (Pin 8)-adjusts the op amp's input offset voltage across an asymmetrical range of –2mV to +8mV. At room temperature, the typical 0.3mV offset falls within this window, allowing zero-adjustment for DC-critical applications like precision current sensing.
Does LT1635CN8#PBF require external capacitors for stability?
Yes, the LT1635CN8#PBF requires a 0.1µF bypass capacitor on the V+ pin (Pin 6) to ensure stability and low-noise operation. When used with split supplies, a similar capacitor is recommended on V– (Pin 4). The op amp is unity-gain stable with up to 1000pF capacitive load, but larger loads may require series isolation resistance per Figure 12 in the datasheet.
How does the reference section of LT1635CN8#PBF differ from standalone voltage references?
The LT1635CN8#PBF reference section integrates a 200mV bandgap core referenced to V–, plus a dedicated buffer amplifier. Unlike most standalone references, it lacks a fixed output voltage - instead, it provides a programmable 200mV feedback node (Pin 1) and buffered output (Pin 8), enabling flexible resistor-divider configurations for 0.2V to >10V outputs. Its 30ppm/°C drift and 150ppm/mA load regulation are optimized for on-die co-location with the op amp.
LT1635CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1635CN8#PBF FAQ
1.How can I place an order for LT1635CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1635CN8#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 LT1635CN8#PBF reliable?
The price and inventory of LT1635CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1635CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1635CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1635CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1635CN8#PBF?
LT1635CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1635CN8#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 LT1635CN8#PBF?
For technical support, including LT1635CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1635CN8#PBF requirements.
6.How does Aetrix verify that LT1635CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1635CN8#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 LT1635CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1635CN8#PBF?
All LT1635CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1635CN8#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 LT1635CN8#PBF part is unused and in its original packaging.
Return procedure for LT1635CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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