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Analog Devices Inc. LT1127ACN#PBF
- Part No.:
- LT1127ACN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1127ACN#PBF.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,976
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Product details
Overview
LT1127ACN#PBF from Analog Devices (formerly Linear Technology) is a quad decompensated precision operational amplifier optimized for high-speed, low-noise signal conditioning in instrumentation and measurement systems. It delivers 65 MHz gain-bandwidth product, 11 V/µs slew rate, 2.7 nV/√Hz input voltage noise at 1 kHz, ±13.7 V output swing (RL ≥ 2 kΩ), and operates over –40°C to +85°C. It is used in strain gauge amplifiers, microphone preamplifiers, and active filters requiring stable gain ≥10.
For engineers reviewing the LT1127ACN#PBF datasheet, LT1127ACN#PBF pinout, LT1127ACN#PBF application, or LT1127ACN#PBF equivalent, key selection criteria include verified decompensated stability at G ≥ 10, 100% tested low-noise performance, guaranteed DC precision (70 µV max VOS, 112 dB min CMRR), and compatibility with 14-lead PDIP layout constraints.
Technical Context
The LT1127ACN#PBF employs a fully differential, decompensated transconductance stage with matched bipolar input pairs, enabling high open-loop gain (>5 million) and wide bandwidth without sacrificing DC accuracy. Its architecture supports stable operation only at closed-loop gains of 10 or greater, distinguishing it from unity-gain-stable counterparts like the LT1125.
All four amplifiers are individually tested for slew rate, gain-bandwidth product, and 1 kHz input voltage noise density - ensuring consistent AC performance across the quad. Input bias current remains below ±30 nA, and channel separation exceeds 130 dB at ≤10 Hz, supporting tightly coupled multi-amplifier topologies such as 3-op-amp instrumentation amplifiers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 65 MHz typical - enables accurate closed-loop gain ≥10 up to ~6.5 MHz. |
| Slew Rate | 11 V/µs typical - supports clean 10 Vpp output at ≥1 MHz for fast transient signals. |
| Input Voltage Noise Density | 2.7 nV/√Hz at 1 kHz - ensures microvolt-level resolution in low-frequency sensor interfaces. |
| Input Offset Voltage | 70 µV maximum (–40°C to +85°C) - guarantees <0.1% gain error in 100× precision amplifiers. |
| Common-Mode Rejection | 112 dB minimum - suppresses >300,000:1 common-mode interference in bridge-based sensors. |
| Supply Current per Amplifier | 3.1 mA maximum - allows full quad operation within 12.4 mA total, suitable for space-constrained analog front-ends. |
| Output Voltage Swing | ±13.7 V into 2 kΩ - delivers full dynamic range with ±15 V supplies, minimizing headroom loss. |
Pinout & Package
LT1127ACN#PBF is housed in a 14-lead plastic DIP (N package) with 0.300-inch width, JEDEC MS-001 compliant, rated for TJMAX = 140°C and θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives external load or feedback network; rail-to-rail capable within specified swing limits. |
| 2 | –IN A | Inverting input of Amp A - high-impedance node; differential input voltage must stay within ±1.4 V to avoid diode conduction. |
| 3 | +IN A | Non-inverting input of Amp A - matched to –IN A for optimal CMRR; protected by back-to-back diodes. |
| 4 | V+ | Positive supply rail - accepts ±4 V to ±18 V; decoupling capacitor required near pin for stability. |
| 5 | +IN B | Non-inverting input of Amp B - electrically isolated but thermally coupled to adjacent amplifiers for matching. |
| 6 | –IN B | Inverting input of Amp B - shares same ESD protection structure and bias network as other inputs. |
| 7 | OUT B | Amplifier B output - independent output stage; no internal crosstalk with Amp A/C/D outputs. |
| 8 | V– | Negative supply rail - referenced to system ground; must be symmetrical to V+ for optimal PSRR. |
| 9 | OUT D | Amplifier D output - fourth channel; identical AC/DC specs to OUT A/B/C; validated for simultaneous use. |
| 10 | –IN D | Inverting input of Amp D - pin 10 is not NC; full functional mapping confirmed per LTC DWG #05-08-1510. |
| 11 | +IN D | Non-inverting input of Amp D - matches pin 3/+IN A in offset drift and bias current distribution. |
| 12 | V– | Shared negative supply - common return for all four amplifiers; requires low-inductance path to ground plane. |
| 13 | +IN C | Non-inverting input of Amp C - positioned between V– and –IN C to minimize thermal gradient effects. |
| 14 | –IN C | Inverting input of Amp C - paired with +IN C for best matching in differential configurations. |
Key Features
| Feature | Design Value |
|---|---|
| 100% tested low-noise performance | Each amplifier undergoes individual 1 kHz voltage noise screening - eliminates outliers in critical sensor chains. |
| Guaranteed decompensated stability | Stable only at closed-loop gain ≥10 - prevents oscillation in high-bandwidth applications without external compensation. |
| Matched amplifier characteristics | Typical VOS mismatch ≤30 µV and CMRR match ≥115 dB - enables precise 3-op-amp instrumentation amplifier designs. |
| High-voltage gain | Minimum 5 million open-loop gain - ensures <0.0002% gain error in 100× closed-loop stages at DC. |
| Low power per channel | Max 3.1 mA supply current per amplifier - allows full quad operation under 12.4 mA, easing thermal management. |
Applications
| Strain Gauge Amplifier | Microphone Preamplifier |
|---|---|
|
Use Scenario: Amplifying mV-level Wheatstone bridge outputs from load cells or pressure sensors in industrial weighing systems. IC Role / Device Role / Timing Role: First-stage gain block with precision DC coupling and low 1/f noise to preserve microstrain resolution. Use Value: 2.7 nV/√Hz noise density and 70 µV max VOS enable sub-10 µV detection thresholds over temperature. |
Use Scenario: Low-noise preamplification of condenser microphone signals in studio audio interfaces and voice-recognition hardware. IC Role / Device Role / Timing Role: High-Z, low-noise voltage amplifier with gain ≥100 before ADC sampling. Use Value: 11 V/µs slew rate preserves transient fidelity up to 20 kHz; 65 MHz GBW avoids phase distortion in audio band. |
| Active Filter (4th-order Butterworth) | Tape Head Preamplifier |
|
Use Scenario: Implementing anti-aliasing or reconstruction filters in data acquisition systems with 100 kHz–1 MHz bandwidth requirements. IC Role / Device Role / Timing Role: Quad op-amp topology realizing cascaded biquad sections with minimal inter-stage interaction. Use Value: Channel separation >130 dB at 10 Hz ensures filter pole accuracy; decompensated design permits sharp roll-off without peaking. |
Use Scenario: Recovering high-frequency magnetic playback signals from analog tape heads with inherent 6 dB/octave rolloff. IC Role / Device Role / Timing Role: Wideband equalization amplifier compensating for head inductance and cable capacitance. Use Value: 65 MHz GBW supports flat response to 20 MHz; low 1/f corner (2.3 Hz) prevents bass distortion in replay circuits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad decompensated op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1127CN | Same silicon, commercial grade (0°C to 70°C), 100 µV max VOS vs 70 µV for LT1127ACN#PBF. | Acceptable where ambient temperature stays within 0–70°C and higher offset is tolerable. | Select LT1127CN only if cost sensitivity outweighs extended temperature and tighter VOS requirements. |
| LT1125CN | Unity-gain stable quad op amp; lower GBW (45 MHz), higher noise (4.2 nV/√Hz), no decompensation requirement. | Suitable for G = 1–9 applications where stability without external compensation is mandatory. | Choose LT1125CN when gain <10 is needed; avoid for LT1127ACN#PBF's target high-G, high-bandwidth use cases. |
Compared with LT1127CN and LT1125CN, the LT1127ACN#PBF provides superior DC precision and wider bandwidth at elevated temperatures, making it the only option among the three qualified for –40°C to +85°C operation with guaranteed 70 µV VOS and 65 MHz GBW.
Availability
LT1127ACN#PBF is available at Aetrix Electronics and suitable for industrial weighing systems, professional audio equipment, precision data acquisition, and test instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LT1127ACN#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 LT1127ACN#PBF belongs to Linear Technology's precision op amp family, engineered specifically for high-speed, low-noise instrumentation applications demanding both wide bandwidth and microvolt-level DC accuracy.
FAQ
What is the minimum stable closed-loop gain for LT1127ACN#PBF?
The LT1127ACN#PBF is decompensated and requires a minimum closed-loop gain of 10 for stability. Attempting unity-gain or gain-of-5 configurations will cause oscillation. Compensation capacitors are not recommended; instead, redesign feedback networks to meet G ≥ 10. This constraint is explicitly guaranteed in the datasheet and applies across the full –40°C to +85°C operating range for LT1127ACN#PBF.
Does LT1127ACN#PBF support dual-supply operation?
Yes, LT1127ACN#PBF is fully specified for dual-supply operation from ±4 V to ±18 V. Its input common-mode range extends to ±12.4 V and output swing reaches ±13.7 V into 2 kΩ loads with ±15 V supplies. The device does not support true single-supply operation (e.g., 0 V to +15 V) because the input and output stages are not rail-to-rail - using it with asymmetric supplies may violate absolute maximum ratings or degrade PSRR.
Is LT1127ACN#PBF pin-compatible with LT1127CN?
Yes, LT1127ACN#PBF and LT1127CN share identical 14-lead PDIP pinouts, footprint, and solder pad layout per JEDEC MS-001. Both use the N package with identical lead pitch (0.100"), body width (0.300"), and pin 1 marking convention. No PCB redesign is needed when upgrading from LT1127CN to LT1127ACN#PBF - only requalification for extended temperature and tighter DC specs is required.
What is the 1/f noise corner frequency of LT1127ACN#PBF?
The 1/f noise corner frequency of LT1127ACN#PBF is 2.3 Hz, as measured and documented in the "Voltage Noise vs Frequency" plot (Figure 1) of the official datasheet. This low corner enables stable microvolt-level measurements down to sub-Hz frequencies, critical for precision DC-coupled sensor interfaces such as strain gauges and thermopiles. The 0.1 Hz to 10 Hz integrated noise is 70 nVp-p (typical), directly derived from this corner and the 2.7 nV/√Hz broadband noise floor.
Can LT1127ACN#PBF drive a 600 Ω audio load?
No, LT1127ACN#PBF is not designed to drive 600 Ω loads. Its output stage is optimized for ≥2 kΩ loads, delivering ±13.7 V swing under that condition. Driving 600 Ω would exceed safe output current limits, causing thermal stress and potential distortion. For 600 Ω line-driving applications, consider dedicated audio line drivers (e.g., LT1055) or buffer stages. LT1127ACN#PBF should be used with ≥2 kΩ loads or followed by a current-boosting stage.
LT1127ACN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 11V/µs
- Gain Bandwidth Product:
- 65 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 7 nA
- Voltage - Input Offset:
- 25 µV
- Current - Supply:
- 2.6mA (x4 Channels)
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
LT1127ACN#PBF FAQ
1.How can I place an order for LT1127ACN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1127ACN#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 LT1127ACN#PBF reliable?
The price and inventory of LT1127ACN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1127ACN#PBF is usually 5 days.
3.What payment methods are accepted for LT1127ACN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1127ACN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1127ACN#PBF?
LT1127ACN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1127ACN#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 LT1127ACN#PBF?
For technical support, including LT1127ACN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1127ACN#PBF requirements.
6.How does Aetrix verify that LT1127ACN#PBF is sourced from the original manufacturer or authorized distributors?
All LT1127ACN#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 LT1127ACN#PBF meets industry standards.
7.What is the process for return or replacement of LT1127ACN#PBF?
All LT1127ACN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1127ACN#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 LT1127ACN#PBF part is unused and in its original packaging.
Return procedure for LT1127ACN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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