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Analog Devices Inc. LT1635IS8#PBF
- Part No.:
- LT1635IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1635IS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:103
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Product details
Overview
LT1635IS8#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 20mA output current, 175kHz gain bandwidth, and 30ppm/°C reference drift in an SO-8 package. Used in battery-powered sensor conditioning and precision voltage regulation.
For engineers reviewing the LT1635IS8#PBF datasheet, LT1635IS8#PBF pinout, LT1635IS8#PBF application, or LT1635IS8#PBF equivalent, key selection criteria include guaranteed industrial temperature operation (–40°C to +85°C), LM10-compatible pinout, 130µA supply current, rail-to-rail output swing within 15mV of rails (no load), and 200mV reference accuracy with 189–211mV initial tolerance.
Technical Context
The LT1635IS8#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 bandgap reference referenced to V–. The op amp features unity-gain stability with up to 1000pF capacitive load and 0.045V/µs slew rate.
Reference functionality includes adjustable gain via external feedback, 150ppm/mA load regulation, 20ppm/V line regulation, and capability for floating-mode operation when configured as a shunt regulator. Both blocks share the same 1.2V–14V total supply range but require ≥1.3V for full reference specification compliance over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.2V to 14V total; supports single-supply (1.2V min) and split-supply (±5V max) operation |
| Supply Current | 130µA typical; enables multi-year battery life in portable instrumentation |
| Op Amp GBW | 175kHz; sufficient for DC–100Hz sensor signal conditioning without instability |
| Output Drive | 20mA min sink/source; drives 1000pF directly, eliminating external buffer in many applications |
| Reference Voltage | 200mV ±11mV (189–211mV); low-drift (30ppm/°C typ) bandgap tied to V– |
| Input Offset Voltage | 0.3–1.8mV over –40°C to +85°C; trimmed for low error in precision measurement |
| Rail-to-Rail Output | Swings to 15mV of rails (no load); maintains linearity down to 250mV at 10mA load |
Pinout & Package
LT1635IS8#PBF 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 reference amplifier inverting input; sets output voltage in regulated configurations |
| 2 (OP AMP IN –) | Inverting input | High-impedance node with phase reversal protection; accepts signals down to V– |
| 3 (OP AMP IN +) | Non-inverting input | High-impedance node; common-mode range includes ground in single-supply mode |
| 4 (V–) | Negative supply rail | Reference point for 200mV bandgap; all reference voltages are relative to this pin |
| 5 (BALANCE) | Offset null adjustment | Accepts external voltage (typically from REFOUT) to trim input offset between –2mV and +8mV |
| 6 (V+) | Positive supply rail | Supplies both op amp and reference; bypassing with 0.1µF capacitor recommended |
| 7 (OP AMP OUT) | Amplifier output | Rail-to-rail capable; sources/sinks 20mA; stable with 1000pF load capacitance |
| 8 (REFOUT) | Reference output | Buffered 200mV reference; sources up to 2mA, sinks 10µA; used for offset trim or regulation |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 130µA supply current enables ultra-low-power sensor nodes and energy-harvesting systems |
| Single-chip op amp + reference | Eliminates discrete reference IC and buffer, reducing BOM count and PCB area by ≥3 components |
| LM10 pin compatibility | Direct drop-in replacement for legacy LM10 designs without layout changes |
| Floating-mode capability | Supports shunt regulator topologies where output connects to V+, enabling high-side sensing |
| Industrial temperature grade | Specified from –40°C to +85°C; qualified for use in automotive cabin, industrial sensors, and outdoor equipment |
Applications
| Battery-Level Indicator | Precision Current Regulator |
|---|---|
Use Scenario: Monitoring voltage of 3.6V Li-ion or 9V alkaline battery in portable medical device. IC Role / Device Role / Timing Role: LT1635IS8#PBF compares battery voltage against internal 200mV reference using op amp; LED driver triggered via comparator action. Use Value: Eliminates external voltage divider and precision reference, reducing quiescent current to <200µA while maintaining ±1% threshold accuracy across temperature. | Use Scenario: Constant-current source for LED biasing or sensor excitation in handheld test equipment. IC Role / Device Role / Timing Role: LT1635IS8#PBF configured as shunt regulator with external resistors; op amp controls pass transistor base while reference sets current setpoint. Use Value: Achieves 0.1% current regulation accuracy over 0–70°C using only two external resistors and no trimming, leveraging 30ppm/°C reference drift. |
| Sensor Signal Conditioning | Low-Voltage Precision Regulator |
Use Scenario: Amplifying mV-level output from thermocouple or bridge-based pressure sensor in battery-powered IoT node. IC Role / Device Role / Timing Role: LT1635IS8#PBF op amp provides gain and offset correction; internal reference supplies excitation and ADC reference. Use Value: Single-supply operation from 1.2V enables direct connection to coin-cell batteries; rail-to-rail I/O preserves dynamic range in sub-1V systems. | Use Scenario: Generating stable 3.0V or 3.3V supply for microcontroller and analog peripherals from 3.6V Li-ion cell. IC Role / Device Role / Timing Role: LT1635IS8#PBF configured as series regulator with external PNP transistor; reference sets output voltage via resistor divider. Use Value: Delivers 50mA output with <10mV line/load regulation and <100ppm/°C thermal drift-superior to standard LDOs at ultra-low quiescent current. |
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 |
|---|---|---|---|
| LT1491ACS8#PBF | Quad rail-to-rail op amp only; no integrated reference; 50µA per amplifier; 200kHz GBW | Requires external reference IC (e.g., LT1004) and buffer; higher total component count | Choose when multiple amplifiers needed and reference is already available on board |
| LT1078CN8#PBF | Dual micropower op amp with 70µV max VOS; no reference; 200kHz GBW; 17µA per amp | Lacks reference function entirely; requires separate precision reference and buffer circuit | Prefer for ultra-low-offset applications where reference is not required or supplied elsewhere |
Compared with LT1491ACS8#PBF and LT1078CN8#PBF, the LT1635IS8#PBF uniquely integrates both precision op amp and 200mV reference in one SO-8 package-reducing footprint, bill-of-materials, and design complexity for single-channel sensor interface or regulation tasks requiring <200µA total supply current.
Availability
LT1635IS8#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor nodes, and portable medical devices requiring stable component supply with guaranteed industrial temperature performance.
Supply support for LT1635IS8#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 its precision analog portfolio. Linear pioneered high-performance, low-power analog ICs for demanding industrial and instrumentation applications.
The LT1635 product line was designed to consolidate rail-to-rail op amp and precision reference functions into a single chip for space-constrained, ultra-low-power systems-targeting portable instrumentation, sensor transmitters, and battery-monitoring circuits.
FAQ
What is the minimum supply voltage for full specification compliance of the LT1635IS8#PBF?
The LT1635IS8#PBF operates from as low as 1.2V for the op amp section, but the integrated 200mV reference requires ≥1.3V supply to meet full specifications-including 30ppm/°C drift and 150ppm/mA load regulation-over the industrial temperature range (–40°C to +85°C). Below 1.3V, reference performance degrades.
Does the LT1635IS8#PBF support true rail-to-rail input operation?
No-the LT1635IS8#PBF features rail-to-rail *output*, but its input common-mode range extends to ground (V–) and up to V+ – 0.5V, not full rail-to-rail. The op amp input stage includes phase reversal protection when inputs go below V–, preventing erroneous outputs during overdrive conditions.
Can the LT1635IS8#PBF be used as a standalone voltage reference without using the op amp?
Yes-the REFOUT (Pin 8) and REF FB (Pin 1) pins allow the 200mV reference to operate independently. With Pin 1 tied to Pin 8, the reference delivers 200mV ±11mV with 30ppm/°C drift. The op amp section remains unused but draws only 130µA total, making it viable for reference-only applications where ultra-low power is critical.
What is the purpose of the BALANCE pin (Pin 5) on the LT1635IS8#PBF?
The BALANCE pin (Pin 5) enables external offset voltage trimming of the op amp. By applying a variable voltage (typically derived from REFOUT), users can adjust input offset between –2mV and +8mV. This allows zeroing of residual offset at system level-critical for high-accuracy DC measurements where laser trimming is unavailable.
Is the LT1635IS8#PBF pin-compatible with the LM10 series?
Yes-the LT1635IS8#PBF uses the industry-standard LM10 pinout in SO-8 packaging. Pin-for-pin compatibility includes identical placement of V+, V–, REFOUT, REF FB, OP AMP IN(+), OP AMP IN(–), OP AMP OUT, and BALANCE. This enables direct replacement in existing LM10 designs without PCB modification.
LT1635IS8#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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1635IS8#PBF FAQ
1.How can I place an order for LT1635IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1635IS8#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 LT1635IS8#PBF reliable?
The price and inventory of LT1635IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1635IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1635IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1635IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1635IS8#PBF?
LT1635IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1635IS8#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 LT1635IS8#PBF?
For technical support, including LT1635IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1635IS8#PBF requirements.
6.How does Aetrix verify that LT1635IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1635IS8#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 LT1635IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1635IS8#PBF?
All LT1635IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1635IS8#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 LT1635IS8#PBF part is unused and in its original packaging.
Return procedure for LT1635IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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