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Texas Instruments OPA627AM
- Part No.:
- OPA627AM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
OPA627AM.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
OPA627AM from Texas Instruments is a precision JFET-input operational amplifier designed for high-speed, low-noise analog signal conditioning in demanding instrumentation and data acquisition systems. It delivers 4.5 nV/√Hz input voltage noise at 10 kHz, 550 ns settling time to 0.01%, ±130 µV max input offset voltage, and unity-gain stability - enabling accurate amplification of high-impedance sensor outputs without oscillation.
For engineers reviewing the OPA627AM datasheet, OPA627AM pinout, OPA627AM application, or OPA627AM equivalent, key selection criteria include its guaranteed –55°C to +125°C operating range, SOIC-8 or TO-99 package options, low 5 pA max input bias current, and compatibility with ±4.5 V to ±18 V dual supplies in precision timing, DAC output buffering, and ultrasound front-end designs.
Technical Context
The OPA627AM uses dielectrically isolated complementary NPN/PNP process technology with laser-trimmed input circuitry to achieve precision FET performance - combining ultra-low input bias current (≤10 pA) with voltage noise comparable to bipolar op amps. Its cascode input stage maintains low IB across ±11.5 V common-mode range.
As a unity-gain stable device, the OPA627AM supports direct use in buffers, integrators, and gain-of-one configurations without external compensation. Its 16 MHz gain-bandwidth product and 40–55 V/µs slew rate support fast transient response in closed-loop gains ≥1, while thermal design is aided by RθJA = 121.5°C/W (SOIC-8) and 200°C/W (TO-99).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Noise | 4.8 nV/√Hz at 10 kHz - enables high-fidelity amplification of low-level signals without degrading SNR in sensor interfaces. |
| Settling Time | 550 ns to 0.01% - ensures rapid stabilization after step inputs in 16-bit+ data acquisition systems. |
| Input Offset Voltage | ±130 µV max - reduces DC error in precision measurement paths without requiring frequent calibration. |
| Input Bias Current | ±10 pA max - preserves signal integrity when driving from high-impedance sources like piezoelectric sensors or photodiode transimpedance nodes. |
| Supply Range | ±4.5 V to ±18 V - supports operation across industrial and test equipment rails without level-shifting circuitry. |
| Operating Temp | –55°C to +125°C - qualified for extended-range military, aerospace, and downhole instrumentation applications. |
| Gain-Bandwidth | 16 MHz - allows stable closed-loop bandwidth up to ~15 MHz at unity gain for wideband filtering or active equalization. |
Pinout & Package
OPA627AM is available in two packages: 8-pin SOIC (D package) and 8-pin metal TO-99 (LMC package). Both are hermetically sealed for reliability in harsh environments. Pin functions are identical across packages except for offset trim terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (SOIC); 1, 5 (TO-99) | Offset Trim / NC | TO-99 pins 1 & 5 connect to internal offset adjustment nodes; unused pins must float. SOIC pins 1, 5, 8 have no internal connection and may be left unconnected. |
| 2 | Inverting Input (–IN) | Differential input node; high-impedance JFET gate with ≤10 pA bias current and 10 TΩ || 8 pF input impedance. |
| 3 | Noninverting Input (+IN) | Differential input node; matches –IN in impedance and bias characteristics for balanced source interfacing. |
| 4 | Negative Supply (V–) | Lowest potential rail connection; supports operation down to –18 V; requires local bypassing near pin. |
| 6 | Output (OUT) | Capable of ±30 mA continuous output drive into 1 kΩ load; open-loop output impedance is 55 Ω at 1 MHz. |
| 7 | Positive Supply (V+) | Highest potential rail connection; supports operation up to +18 V; requires local bypassing near pin. |
| 8 (TO-99) | No Connect | Internally unconnected; must be floated - not tied to case or ground. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Operates stably with gain = 1 without external compensation - simplifies buffer and follower designs in sensitive signal chains. |
| Laser-trimmed input stage | Delivers ±130 µV max VOS and ±2 µV/°C max drift over –55°C to +125°C - reduces system-level calibration burden. |
| Ultra-low input bias current | ≤10 pA max at 25°C and ≤2 nA over –25°C to +85°C - preserves accuracy in high-Z sensor and electrometer applications. |
| High CMRR & PSRR | ≥100 dB CMRR and ≥100 dB PSRR - rejects interference from noisy power rails and common-mode disturbances in mixed-signal PCBs. |
| Wide supply range | ±4.5 V to ±18 V operation - eliminates need for dedicated low-voltage rails in multi-stage analog front ends. |
Applications
| Precision Instrumentation | Fast Data Acquisition |
|---|---|
Use Scenario: High-resolution digital multimeters and automated test equipment measuring microvolt-level DC signals with nanovolt sensitivity. IC Role / Device Role / Timing Role: Front-end DC-coupled amplifier providing low-drift, low-noise gain before ADC sampling. Use Value: ±130 µV max offset and ±2 µV/°C drift minimize calibration frequency; 4.8 nV/√Hz noise preserves effective resolution in 24-bit systems. | Use Scenario: 1 MSPS+ data loggers capturing transient waveforms from strain gauges, accelerometers, or thermocouples. IC Role / Device Role / Timing Role: Settling-optimized buffer between multiplexer and SAR ADC input, ensuring full-scale accuracy within 550 ns. Use Value: 550 ns to 0.01% settling guarantees error-free sampling at >1.8 kSPS per channel in time-multiplexed systems. |
| DAC Output Amplifier | Ultrasound Signal Conditioning |
Use Scenario: Precision current-to-voltage conversion and output buffering for 16–20-bit DACs in programmable power supplies and waveform generators. IC Role / Device Role / Timing Role: Low-offset, low-noise I/V converter and gain stage driving low-impedance loads. Use Value: ≤10 pA input bias prevents DAC output voltage error due to leakage; ±130 µV VOS limits full-scale INL degradation to <0.002%. | Use Scenario: Receive-path amplification in medical ultrasound beamformers where weak echo signals require minimal added noise. IC Role / Device Role / Timing Role: First-stage low-noise preamplifier following piezoelectric transducer elements. Use Value: 4.8 nV/√Hz noise density dominates system noise floor below 100 kHz, improving contrast resolution in B-mode imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision JFET op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA627BM | Same architecture and package; tighter VOS (±40 µV max) and lower drift (±0.8 µV/°C max) over –25°C to +85°C. | Optimized for commercial/industrial temperature range only; not rated for –55°C operation. | Select OPA627BM when highest DC precision is required within 0°C–85°C ambient and extended temperature qualification is unnecessary. |
| OPA637AM | Same family, same temp range (–55°C to +125°C), but gain-stable only at ≥5; higher GBW (80 MHz) and faster settling (450 ns @ 0.01%). | Requires minimum noise gain of 5 - unsuitable for unity-gain buffers or integrators without compensation. | Select OPA637AM only when closed-loop gain ≥5 is guaranteed and bandwidth >16 MHz is needed; avoid in gain-of-one circuits. |
Compared with OPA627BM, the OPA627AM trades tighter initial offset for extended temperature qualification; compared with OPA637AM, it sacrifices speed for unconditional unity-gain stability - making OPA627AM the sole choice for uncompensated precision buffers across military-grade thermal ranges.
Availability
OPA627AM is available at Aetrix Electronics and suitable for precision instrumentation, ultrasound front-ends, and high-reliability data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA627AM 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA627AM belongs to TI's OPA6x7 precision JFET op amp family, engineered for applications demanding simultaneous low noise, low drift, high speed, and wide supply range - particularly in test & measurement, medical imaging, and aerospace signal chains.
FAQ
What is the maximum operating temperature range for the OPA627AM?
The OPA627AM is specified for operation from –55°C to +125°C, making it suitable for extreme-environment applications including military, aerospace, and downhole instrumentation. This extended range is confirmed in Section 5.3 (Recommended Operating Conditions) and Table 5.7 of the SBOS165C datasheet, distinguishing it from commercial variants like OPA627BM.
Is the OPA627AM unity-gain stable, and why does that matter?
Yes, the OPA627AM is unity-gain stable - meaning it remains stable with closed-loop gain = 1 without external compensation. This is critical for buffer, voltage-follower, and integrator applications where phase margin would otherwise collapse. The OPA627AM achieves this via internal compensation optimized for wide supply and temperature ranges, unlike the OPA637AM which requires gain ≥5.
What are the key noise specifications of the OPA627AM?
The OPA627AM has 4.8 nV/√Hz input voltage noise density at 10 kHz and 0.8 µVPP integrated noise (0.1 Hz–10 Hz). Its input current noise is 2.5 fA/√Hz at 100 Hz. These values enable high-SNR amplification of microvolt-level signals from high-impedance sources such as piezoelectric sensors or photodiodes - directly supporting precision instrumentation and ultrasound receive chains.
Can the OPA627AM be used in TO-99 and SOIC-8 packages interchangeably?
Yes - the OPA627AM is offered in both 8-pin SOIC (D package) and 8-pin metal TO-99 (LMC package), with identical electrical specifications and pin functions except for offset trim terminals (present only on TO-99). Thermal resistance differs: RθJA = 121.5°C/W (SOIC) vs. 200°C/W (TO-99), so heatsinking or layout must be adapted accordingly for thermal management.
How does the OPA627AM's input bias current compare to other precision op amps?
The OPA627AM specifies ≤10 pA maximum input bias current at 25°C and ≤2 nA over –25°C to +85°C - among the lowest for JFET-input op amps in its class. This outperforms bipolar-input devices (typically nA range) and exceeds many competing FET op amps, enabling accurate amplification of signals from sources with impedances >1 GΩ, such as electret microphones or radiation detectors.
OPA627AM Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- TO-99-8 Metal Can
- Packaging:
- Tube
- Product Status:
- Not For New Designs
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 55V/µs
- Gain Bandwidth Product:
- 16 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 pA
- Voltage - Input Offset:
- 130 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
OPA627AM FAQ
1.How can I place an order for OPA627AM through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA627AM 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 OPA627AM reliable?
The price and inventory of OPA627AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA627AM is usually 5 days.
3.What payment methods are accepted for OPA627AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA627AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA627AM?
OPA627AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA627AM 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 OPA627AM?
For technical support, including OPA627AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA627AM requirements.
6.How does Aetrix verify that OPA627AM is sourced from the original manufacturer or authorized distributors?
All OPA627AM 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 OPA627AM meets industry standards.
7.What is the process for return or replacement of OPA627AM?
All OPA627AM units undergo pre-shipment inspection (PSI). If there is an issue with OPA627AM, 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 OPA627AM part is unused and in its original packaging.
Return procedure for OPA627AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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