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Analog Devices Inc. LT1125CN#PBF
- Part No.:
- LT1125CN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1125CN#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
LT1125CN#PBF from Analog Devices (formerly Linear Technology) is a quad low-noise, high-speed precision operational amplifier in a 14-lead PDIP package. It delivers 4.2nV/√Hz max input voltage noise, 4.5V/µs typical slew rate, and 12.5MHz gain-bandwidth product, with 106dB min common-mode rejection and ±12.5V output swing into 2kΩ - enabling high-fidelity signal conditioning in instrumentation amplifier front-ends and strain gauge interfaces.
For engineers reviewing the LT1125CN#PBF datasheet, LT1125CN#PBF pinout, LT1125CN#PBF application, or LT1125CN#PBF equivalent, this page provides verified pin functions, real-world application cards for microvolt-threshold detection and infrared detector amplification, confirmed alternative parts with documented parameter trade-offs, and supply-chain support for industrial embedded designs requiring long-lifecycle op amp sourcing.
Technical Context
The LT1125CN#PBF uses a bipolar input stage optimized for low 1/f and broadband voltage noise, with 100% per-amplifier testing of slew rate, gain-bandwidth, and 1kHz noise. Its architecture achieves 5 million minimum open-loop voltage gain and 116dB min power supply rejection, supporting stable DC-coupled gain stages without external compensation.
Designed as a drop-in replacement for OP-470 sockets, it maintains matched performance across all four amplifiers - with guaranteed 140µV max input offset voltage (LT1125C grade), 20nA max input offset current, and 2.75mA max supply current per amplifier at ±15V - making it suitable for multi-channel precision analog systems where channel-to-channel consistency matters.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Noise Density | 4.2nV/√Hz max at 1kHz - enables sub-microvolt signal resolution in low-frequency sensor interfaces |
| Slew Rate | 4.5V/µs typ - supports clean 100kHz full-power response for 10Vpp outputs without distortion |
| Gain-Bandwidth | 12.5MHz typ - allows stable closed-loop gains up to 1000 with usable bandwidth beyond 10kHz |
| Input Offset Voltage | 140µV max (LT1125C grade) - ensures ≤0.1% gain error in 100× instrumentation amplifier configurations |
| CMRR | 106dB min - rejects >200µV of common-mode interference in bridge-based transducer circuits |
| Supply Current | 2.75mA max per amplifier - enables quad-channel precision amplification within 11mA total budget at ±15V |
Pinout & Package
LT1125CN#PBF is housed in a 14-lead plastic dual in-line package (N package, 0.300" wide), with standard pinout matching industry quad op amp footprints including OP-470. Pin 1 is located at the top-left corner when the notch faces upward.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads ≥2kΩ with ±12.5V swing |
| 2 | –IN A | Inverting input of Amp A - accepts differential signals with ±12V common-mode range |
| 3 | +IN A | Non-inverting input of Amp A - low bias current (±8nA max) minimizes resistor-induced errors |
| 4 | V+ | Positive supply rail - operates from +4V to +18V relative to V– |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated from other inputs for multi-channel independence |
| 6 | –IN B | Inverting input of Amp B - matched to Amp A for differential pair applications |
| 7 | OUT B | Amplifier B output - identical AC/DC specs to OUT A |
| 8 | V– | Negative supply rail - operates from –18V to –4V relative to V+ |
| 9 | OUT C | Amplifier C output - fully independent channel with same noise and gain specs |
| 10 | –IN C | Inverting input of Amp C - supports separate feedback networks per channel |
| 11 | +IN C | Non-inverting input of Amp C - low input capacitance (≈2pF) preserves high-frequency stability |
| 12 | +IN D | Non-inverting input of Amp D - enables four independent gain blocks on one IC |
| 13 | –IN D | Inverting input of Amp D - pin-compatible with OP-470 for direct socket replacement |
| 14 | OUT D | Amplifier D output - completes quad configuration with no shared internal nodes |
Key Features
| Feature | Design Value |
|---|---|
| 100% per-amplifier noise test | Each of four op amps individually verified to ≤4.2nV/√Hz - eliminates risk of one noisy channel degrading system SNR |
| High CMRR & PSRR | 106dB min CMRR and 110dB min PSRR - maintains accuracy in unregulated supplies and noisy industrial environments |
| Matched quad topology | Guaranteed 150µV max VOS mismatch between any two amplifiers - critical for 3-op-amp instrumentation designs |
| Robust output stage | Indefinite short-circuit capability with thermal shutdown - survives accidental wiring faults without damage |
| Wide supply range | ±4V to ±18V operation - supports both low-voltage portable systems and high-dynamic-range industrial rails |
Applications
| Strain Gauge Amplifier | Microvolt Threshold Detection |
|---|---|
|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells in factory automation scales. IC Role / Device Role / Timing Role: Primary gain stage in a 3-op-amp instrumentation configuration with shield driver feedback. Use Value: 140µV max VOS and 4.2nV/√Hz noise enable resolution of <10µV signals over 10Hz–1kHz bandwidth. |
Use Scenario: Detecting precise voltage thresholds in medical ECG front-ends where baseline drift must be rejected. IC Role / Device Role / Timing Role: Precision comparator preamplifier driving a window comparator with <50µV hysteresis. Use Value: 116dB PSRR suppresses 60Hz supply coupling, while 12.5MHz GBW ensures fast response to transient cardiac events. |
| Infrared Detector Interface | Tape Head Preamplifier |
|
Use Scenario: Conditioning low-current photodiode outputs from NDIR gas sensors operating at ambient temperature. IC Role / Device Role / Timing Role: Transimpedance amplifier with 1MΩ feedback resistor and active guarding. Use Value: 20nA max IOS prevents >2mV offset error in high-Z photodiode circuits; 4.5V/µs slew rate handles 50kHz modulation envelopes. |
Use Scenario: Boosting weak audio signals from analog tape playback heads before ADC sampling. IC Role / Device Role / Timing Role: Low-noise, DC-coupled gain block with RIAA equalization network. Use Value: 2.7nV/√Hz typical noise preserves dynamic range below 50µV RMS; 106dB CMRR rejects head crosstalk and motor noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OP-470GP | Higher 5.0nV/√Hz noise (sample tested), lower 5MHz GBW, no 100% per-amplifier noise screening | Limited to lower-bandwidth (<50kHz) precision applications; less suitable for IR detector or THD-sensitive audio | Select OP-470GP only if legacy board compatibility outweighs noise and speed requirements |
| LT1125CSW#PBF | Same electrical specs but in 16-lead SO wide package; 0°C to 70°C temp range vs. LT1125CN#PBF's 0°C to 70°C | Better for automated SMT assembly; requires PCB redesign due to different footprint and thermal characteristics | Choose LT1125CSW#PBF for new surface-mount designs needing RoHS-compliant SO packaging |
Compared with OP-470GP, LT1125CN#PBF delivers 15% lower noise, 2.5× higher bandwidth, and guaranteed per-amplifier screening - justifying its use in next-generation sensor signal chains. Against LT1125CSW#PBF, it trades SMT efficiency for through-hole serviceability and identical spec compliance in legacy PDIP layouts.
Availability
LT1125CN#PBF is available at Aetrix Electronics and suitable for industrial instrumentation, medical sensor interfaces, and test equipment requiring stable component supply with long-term manufacturability and consistent parametric performance across production lots.
Supply support for LT1125CN#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 continues to manufacture and support its precision analog portfolio, including legacy op amps with rigorous long-term reliability validation.
The LT1125 series was designed specifically for high-accuracy, low-noise multi-channel analog signal conditioning - targeting instrumentation, transducer interfacing, and precision measurement systems where quad integration reduces board space without sacrificing per-channel performance.
FAQ
What is the maximum operating temperature range for LT1125CN#PBF?
The LT1125CN#PBF is specified for 0°C to 70°C ambient operating temperature. This grade is not tested at extended temperatures; for –40°C to 85°C operation, consider LT1125ACN#PBF or LT1125IS8#PBF variants. The LT1125CN#PBF's absolute maximum junction temperature is 140°C, with θJA = 110°C/W in the N8 package.
Does LT1125CN#PBF support single-supply operation?
Yes, LT1125CN#PBF supports single-supply operation with input common-mode range extending to within 1.5V of V– and output swing to within 1.5V of either rail. For example, with V+ = +15V and V– = 0V, it accepts inputs down to +1.5V and delivers outputs from +1.5V to +13.5V into 2kΩ - enabling ground-referenced sensor interfaces without level-shifting circuitry.
How does LT1125CN#PBF compare to LT1124CN8#PBF in terms of noise and channel count?
LT1125CN#PBF and LT1124CN8#PBF share identical per-amplifier noise specs (4.2nV/√Hz max), slew rate (4.5V/µs typ), and GBW (12.5MHz typ), but LT1125CN#PBF integrates four amplifiers versus two in LT1124CN8#PBF. Both use the same bipolar process and 100% per-amplifier noise testing - making LT1125CN#PBF ideal for compact quad-channel designs where space is constrained.
Can LT1125CN#PBF replace OP-470 in existing sockets?
Yes, LT1125CN#PBF is a direct pin-compatible replacement for OP-470GP in 14-lead PDIP sockets. Its pinout matches exactly: pins 1–7 and 8–14 correspond to OUT A through OUT D and associated inputs. No PCB changes are required, and performance improvements - including lower noise, higher slew rate, and better PSRR - are realized immediately upon substitution.
What is the typical input bias current for LT1125CN#PBF at 25°C?
The typical input bias current for LT1125CN#PBF is ±7nA at 25°C, with a maximum of ±30nA across the 0°C to 70°C range. This low IB enables high-impedance sensor interfaces (e.g., pH electrodes or piezoelectric transducers) without significant voltage error from feedback resistor networks - especially critical in configurations using >100kΩ gain-setting resistors.
LT1125CN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 4.5V/µs
- Gain Bandwidth Product:
- 12.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 8 nA
- Voltage - Input Offset:
- 30 µV
- Current - Supply:
- 2.3mA (x4 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 44 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LT1125CN#PBF FAQ
1.How can I place an order for LT1125CN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1125CN#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 LT1125CN#PBF reliable?
The price and inventory of LT1125CN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1125CN#PBF is usually 5 days.
3.What payment methods are accepted for LT1125CN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1125CN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1125CN#PBF?
LT1125CN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1125CN#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 LT1125CN#PBF?
For technical support, including LT1125CN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1125CN#PBF requirements.
6.How does Aetrix verify that LT1125CN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1125CN#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 LT1125CN#PBF meets industry standards.
7.What is the process for return or replacement of LT1125CN#PBF?
All LT1125CN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1125CN#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 LT1125CN#PBF part is unused and in its original packaging.
Return procedure for LT1125CN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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