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Analog Devices Inc. LT1637CDD#PBF
- Part No.:
- LT1637CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
LT1637CDD#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DFN
- Quantity:
- Payment:
- Shipping:
Inventory:950
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Product details
Overview
LT1637CDD#PBF from Analog Devices (formerly Linear Technology) is a micropower, rail-to-rail input/output operational amplifier with Over-The-Top® input stage enabling operation with inputs up to 44V above V– and beyond V+. It delivers 1.1MHz gain-bandwidth, 0.4V/µs slew rate, ±25mA output drive, and shutdown capability reducing quiescent current to 3µA. It operates from 2.7V to 44V total supply and is specified for –40°C to 85°C, targeting battery-powered sensor conditioning and high-voltage current sensing.
For engineers reviewing the LT1637CDD#PBF datasheet, LT1637CDD#PBF pinout, LT1637CDD#PBF application, or LT1637CDD#PBF equivalent, this page provides verified package mapping (8-lead 3mm × 3mm DFN), confirmed shutdown timing (tON = 45µs, tOFF = 3µs), rail-to-rail I/O behavior under 3V/5V/±15V supplies, reverse supply protection to 25V, and input overvoltage tolerance without phase reversal - all validated for the C-grade DD-package variant.
Technical Context
The LT1637CDD#PBF employs a dual-input-stage architecture (NPN + PNP) enabling continuous high-impedance operation across its full input common-mode range (–0.4V to 44V on single supply), including operation with inputs exceeding V+. Its Over-The-Top® topology allows direct sensing of signals referenced to high-side rails without level-shifting.
Internal compensation ensures stability into ≥200pF capacitive loads; optional 0.22µF + 150Ω output network extends stable drive capability to 4700pF. Shutdown control is implemented via a dedicated SHDN pin (compatible with 0–32V above V–) that forces output high-impedance and reduces supply current to ≤12µA while preserving input bias current <0.1nA even at 44V input overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Supply Voltage | 2.7V to 44V - supports wide-range single-supply (3V, 5V) and split-supply (±15V) operation without derating. |
| Gain-Bandwidth Product | 1.1MHz - enables stable unity-gain buffer and low-noise signal amplification up to ~100kHz closed-loop bandwidth. |
| Input Offset Voltage | 125µV (min), 550µV (max) at –40°C to 85°C - ensures precision DC-coupled measurement in current-sense and sensor interfaces. |
| Output Drive Current | ±25mA - drives heavy loads (e.g., 200Ω at 5V) and 4–20mA transmitter circuits without external buffers. |
| Quiescent Current | 250µA (active), 3µA (shutdown) - enables multi-year battery life in portable instrumentation and remote sensors. |
| Input Common-Mode Range | –0.4V to 44V (single supply) - permits direct monitoring of voltages above V+ (Over-The-Top®) and down to 0.4V below ground. |
| CMRR | 80dB to 110dB - maintains accuracy in noisy industrial environments with varying ground potentials. |
Pinout & Package
LT1637CDD#PBF is housed in an 8-lead 3mm × 3mm plastic DFN package with exposed thermal pad connected to V–. The package supports high-density PCB layouts and enhanced thermal performance (θJA = 160°C/W) when mounted with proper solder paste stencil and reflow profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4 | Null / No Connect | Internally unused; must be left floating or tied to V– per layout guidelines - no functional connection required. |
| 2 | Inverting Input (–IN) | Differential input node; accepts common-mode voltages up to 44V above V– with no phase reversal or damage. |
| 3 | Non-Inverting Input (+IN) | Differential input node; identical Over-The-Top® voltage tolerance as –IN; supports rail-to-rail input swing. |
| 5 | Shutdown (SHDN) | Active-high control: ≥1.2V above V– enables normal operation; ≤0.3V above V– places device in ultra-low-power shutdown mode. |
| 6 | Output (OUT) | Rail-to-rail output capable of sourcing/sinking ±25mA; high-impedance in shutdown; tolerates output forced >25V above V+ with <1nA leakage. |
| 7 | Positive Supply (V+) | Primary positive rail; requires local 0.01µF bypass; reverse-battery protected up to 25V (IS < 1nA). |
| 8 | Negative Supply (V–) | Primary negative rail or ground reference; exposed pad internally connected to V– for thermal and electrical integrity. |
Key Features
| Feature | Design Value |
|---|---|
| Over-The-Top® Input Stage | Enables input operation up to 44V above V– regardless of V+, eliminating need for external level-shifters in high-side sensing. |
| Rail-to-Rail Input and Output | Supports full dynamic range utilization on 3V systems: input from –0.4V to 44V, output swings within 3mV of rails at light loads. |
| Micropower Shutdown | Reduces supply current to ≤12µA while maintaining input bias current <0.1nA - critical for wake-up circuitry and energy harvesting. |
| Reverse Supply Protection | Draws <1nA at –25V reverse supply - prevents battery drain and system damage in automotive and backup power applications. |
| Capacitive Load Drive | Stable into ≥200pF; with optional 0.22µF + 150Ω compensation, drives up to 4700pF - suitable for long cables and ADC input filtering. |
Applications
| Battery Monitoring | High-Voltage Current Sensing |
|---|---|
|
Use Scenario: Real-time monitoring of Li-ion cell voltage or lead-acid battery stack voltage in portable medical devices and UPS systems. IC Role / Device Role / Timing Role: Precision differential amplifier measuring cell voltage referenced to high-side rail, rejecting common-mode noise up to 44V. Use Value: Eliminates need for isolated amplifiers or resistive dividers, preserving measurement accuracy and extending battery runtime via 250µA quiescent current. |
Use Scenario: Bidirectional current sensing in 24V–48V industrial motor drives and solar charge controllers. IC Role / Device Role / Timing Role: High-side current sense amplifier using shunt resistor, operating with input common-mode up to 44V while output swings rail-to-rail. Use Value: Enables accurate ±25mA output drive into 10kΩ load for analog-to-digital conversion, with 350µV max offset ensuring <0.5% error at 100mV sense voltage. |
| Over-The-Top Comparator | 4–20mA Transmitter Interface |
|
Use Scenario: Lamp outage detection or open-wire fault detection in building automation and street lighting systems. IC Role / Device Role / Timing Role: Comparator with built-in hysteresis, accepting inputs up to 44V above ground while powered from 3V–5V logic rail. Use Value: Direct interface to high-voltage field wiring without level translation; shutdown mode reduces standby power to <12µA during maintenance cycles. |
Use Scenario: Voltage-to-current conversion stage in loop-powered process transmitters for pressure, temperature, and flow sensors. IC Role / Device Role / Timing Role: Precision op-amp driving external NPN/PNP pair to generate regulated 4–20mA output referenced to loop supply. Use Value: Rail-to-rail output ensures full 16mA span utilization; 1.1MHz GBW supports fast step response (<9µs settling to 0.1%) for dynamic process control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1490ACDD#PBF | Lower supply current (160µA), lower GBW (150kHz), no shutdown, same DFN-8 package. | Lacks shutdown and Over-The-Top® input; limited to ≤36V input common-mode; unsuitable for >40V sensing. | Select when ultra-low power dominates over high-voltage input capability and shutdown is unnecessary. |
| ADA4091-2ARMZ | Higher precision (125µV VOS max), lower noise (11nV/√Hz), but only 36V max supply and no Over-The-Top® input. | Not rated for inputs >V+; requires external protection for >36V common-mode; no reverse supply protection. | Choose for low-noise sensor front-ends where input voltage stays within supply rails and 36V ceiling is acceptable. |
Compared with LT1490ACDD#PBF and ADA4091-2ARMZ, the LT1637CDD#PBF uniquely combines 44V Over-The-Top® input operation, 25mA output drive, and sub-µA shutdown - making it irreplaceable in high-side current sensing and battery stack monitoring where input voltage exceeds V+ and power budget is constrained.
Availability
LT1637CDD#PBF is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial current sensing, and 4–20mA transmitter designs requiring stable component supply, long-term lifecycle support, and guaranteed C-grade (–40°C to 85°C) performance.
Supply support for LT1637CDD#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 product continuity, documentation, and manufacturing for legacy Linear parts including the LT1637 family.
The LT1637 product line was designed specifically for ruggedized, micropower precision amplification in high-common-mode-voltage environments - targeting battery monitoring, sensor signal conditioning, and industrial process control where rail-to-rail operation and Over-The-Top® input capability are essential.
FAQ
What is the maximum input voltage the LT1637CDD#PBF can tolerate relative to V–?
The LT1637CDD#PBF supports a differential input voltage of ±44V and a common-mode input range of –0.4V to 44V on single supply - meaning either input can safely operate up to 44V above V–, even when V+ is as low as 3V. This Over-The-Top® capability is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables for the C-grade DD package.
Does the LT1637CDD#PBF require external compensation for driving capacitive loads?
The LT1637CDD#PBF is internally compensated for stable operation into ≥200pF. For capacitive loads exceeding 200pF - such as long cables or ADC input filters - a 0.22µF capacitor in series with a 150Ω resistor between OUT and ground extends stable drive capability to 4700pF, as verified in the Typical Performance Characteristics (Figure 1637 G20) and Applications section.
What is the shutdown current consumption of the LT1637CDD#PBF?
In shutdown mode (SHDN pin ≤0.3V above V–), the LT1637CDD#PBF draws ≤12µA supply current and exhibits ≤1µA output leakage current, while maintaining input bias current <0.1nA - enabling ultra-low-power sleep states in portable and energy-harvesting systems.
Is the LT1637CDD#PBF pin-compatible with other LT1637 package variants?
No - the LT1637CDD#PBF uses an 8-lead 3mm × 3mm DFN package with exposed thermal pad connected to V–, whereas the SO-8 (LT1637CS8), MSOP-8 (LT1637CMS8), and PDIP-8 (LT1637CN8) variants have different pinouts and thermal characteristics. Pin mapping differs significantly: DFN Pin 1/4 are NC, while SO-8 Pin 1 is NC and Pin 4 is V–.
What is the guaranteed operating temperature range for the LT1637CDD#PBF?
The LT1637CDD#PBF is a C-grade device with a guaranteed operating temperature range of –40°C to +85°C, and is fully specified for electrical performance across this range - including input offset voltage (≤550µV), supply current (≤295µA), and gain-bandwidth (≥500kHz) - as documented in the "LT1637C/LT1637I" Electrical Characteristics tables.
LT1637CDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- Over-The-Top®
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 0.4V/µs
- Gain Bandwidth Product:
- 1.1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 17 nA
- Voltage - Input Offset:
- 125 µV
- Current - Supply:
- 230µA
- Current - Output / Channel:
- 31.7 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-DFN (3x3)
LT1637CDD#PBF FAQ
1.How can I place an order for LT1637CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1637CDD#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 LT1637CDD#PBF reliable?
The price and inventory of LT1637CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1637CDD#PBF is usually 5 days.
3.What payment methods are accepted for LT1637CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1637CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1637CDD#PBF?
LT1637CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1637CDD#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 LT1637CDD#PBF?
For technical support, including LT1637CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1637CDD#PBF requirements.
6.How does Aetrix verify that LT1637CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LT1637CDD#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 LT1637CDD#PBF meets industry standards.
7.What is the process for return or replacement of LT1637CDD#PBF?
All LT1637CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1637CDD#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 LT1637CDD#PBF part is unused and in its original packaging.
Return procedure for LT1637CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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