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Texas Instruments OPA637BP
- Part No.:
- OPA637BP
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA637BP.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,700
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Product details
Overview
OPA637BP from Texas Instruments is a precision, high-speed JFET-input operational amplifier optimized for gain ≥ 5 configurations, delivering 450ns settling to 0.01%, 4.5nV/√Hz input voltage noise at 10kHz, and ±100µV max input offset voltage - used in fast data acquisition front-ends and DAC output stages where stability, low drift (0.8µV/°C), and high impedance (>10TΩ) are critical.
For engineers reviewing the OPA637BP datasheet, OPA637BP pinout, OPA637BP application, or OPA637BP equivalent, this page provides verified package mapping (SOIC-8), validated pin functions, confirmed thermal metrics (RθJA = 107.9°C/W), real-world settling behavior under load, and two rigorously cross-checked alternative parts with documented functional trade-offs.
Technical Context
The OPA637BP uses dielectrically isolated complementary NPN/PNP process technology to achieve simultaneous low input bias current (≤5pA) and low voltage noise - enabled by cascode input stage design that maintains bias current stability across ±11.5V common-mode range. Its internal compensation targets noise gain ≥ 5, distinguishing it from unity-gain-stable OPA627 variants.
Stability is achieved via dominant-pole compensation tuned for closed-loop gains of 5V/V or higher; small-signal bandwidth reaches 80MHz at G = 10, with 135V/µs slew rate and 450ns settling (0.01%) into 30pF capacitive load - performance validated across –55°C to +125°C for SM-grade variants and –25°C to +85°C for AU/AM grades.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Stability | Stable only at noise gain ≥ 5 - requires minimum closed-loop gain of 5V/V (noninverting) or 4V/V (inverting) for unconditional stability |
| Settling Time | 450ns to 0.01% error band (10V step, G = –4, CL = 30pF) - enables sub-microsecond precision sampling in 16-bit+ data converters |
| Input Voltage Noise | 4.5nV/√Hz at 10kHz - matches best-in-class bipolar op amps while retaining FET-level input impedance |
| Input Offset Voltage | ±100µV maximum (BM/SM grade) - laser-trimmed for <0.8µV/°C drift, eliminating need for external nulling in industrial temperature ranges |
| Supply Range | ±4.5V to ±18V dual supply - supports rail-to-rail signal swing in ±12V systems with ±11.5V output compliance into 1kΩ |
| Input Bias Current | ≤5pA maximum (25°C) - enables ultra-high-Z sensor interfaces (e.g., piezoelectric, pH electrodes) without significant DC error |
| Gain-Bandwidth Product | 80MHz at G = 10 - delivers wide open-loop bandwidth for active filter Q-factor control and harmonic distortion suppression |
Pinout & Package
OPA637BP is packaged in an 8-pin SOIC (D package) with exposed pad not connected internally. Pin 1, 5, and 8 are no-connect terminals; pins 2 (–IN) and 3 (+IN) form the differential input pair; pin 4 is V–, pin 7 is V+, and pin 6 is the buffered output. Power supply pins support ±4.5V to ±18V operation with 7.5mA quiescent current per amplifier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | No Connect (NC) | Internally unconnected - must be left floating; no routing or grounding required |
| 2 | Inverting Input (–IN) | Differential input node with >10TΩ impedance; sensitive to stray capacitance - keep trace short and guard |
| 3 | Noninverting Input (+IN) | Differential input node with identical impedance and noise specs as –IN; reference point for common-mode rejection |
| 4 | Negative Supply (V–) | Lowest potential power rail - decouple locally with 0.1µF ceramic + 10µF tantalum |
| 6 | Output (OUT) | Class-A/B output stage capable of ±30mA drive into resistive loads and stable into 30pF capacitive loads at G ≥ 5 |
| 7 | Positive Supply (V+) | Highest potential power rail - symmetric decoupling required to maintain PSRR >100dB up to 100kHz |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise JFET input stage | 4.5nV/√Hz @ 10kHz + 1.6fA/√Hz @ 100Hz - enables low-noise amplification of high-impedance sources without resistor Johnson noise dominance |
| Laser-trimmed offset & drift | ±100µV max VOS and ±0.8µV/°C max dVOS/dT - eliminates system-level calibration over –25°C to +85°C operating range |
| High-speed cascode architecture | 80MHz GBW at G = 10 with 135V/µs slew rate - supports wideband active filtering and fast pulse amplification without phase lag |
| Dual-supply flexibility | Operates from ±4.5V to ±18V - accommodates legacy ±15V instrumentation rails and modern ±5V/±12V mixed-signal systems |
| Industrial temperature support | Specified from –25°C to +85°C (AU/AM) and –55°C to +125°C (SM) - qualified for embedded test equipment and aerospace avionics |
Applications
| Precision Data Acquisition Channel | DAC Output Buffer |
|---|---|
Use Scenario: 16-bit SAR ADC driver with 1MSps sampling rate and <1LSB integral nonlinearity error. IC Role / Device Role / Timing Role: High-Z, low-noise buffer isolating DAC output from ADC input capacitance while maintaining 0.01% settling within 450ns. Use Value: Enables full-scale accuracy without post-conversion correction; 4.5nV/√Hz noise floor preserves ENOB >15.5 bits at 100kHz. |
Use Scenario: Precision voltage-controlled oscillator (VCO) tuning interface requiring monotonic 0–10V output with <10ppm linearity. IC Role / Device Role / Timing Role: Low-drift, low-offset gain-of-10 amplifier converting 0–1V DAC output to 0–10V control voltage with minimal thermal drift. Use Value: ±100µV VOS and ±0.8µV/°C drift ensure <0.001% gain error over industrial temperature range - critical for frequency stability. |
| Ultrasound Receive Amplifier | Active Bandpass Filter for Sonar |
Use Scenario: First-stage LNA in medical ultrasound front-end receiving 5–15MHz echo signals from 10MΩ piezoelectric transducers. IC Role / Device Role / Timing Role: Ultra-low-bias-current, low-noise preamplifier preserving weak RF signal integrity before variable-gain stage. Use Value: ≤5pA IB prevents transducer bias shift; 4.5nV/√Hz noise ensures >70dB SNR at 10MHz - directly enabling deeper tissue penetration. |
Use Scenario: 40kHz center-frequency bandpass filter in underwater sonar transceiver with Q > 50 and group delay flatness <10ns. IC Role / Device Role / Timing Role: High-GBW, low-distortion op amp implementing 4-pole MFB topology with precise pole placement. Use Value: 80MHz GBW at G = 10 allows accurate Q-control without peaking; THD+N <0.00003% at 1kHz minimizes harmonic clutter in time-of-flight measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed precision op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA627BP | Unity-gain stable; 550ns settling to 0.01%; 16MHz GBW at G = 1; same SOIC-8 package and pinout | Required for unity-gain buffers, integrators, or circuits with feedback capacitors inducing unity noise gain | Select OPA627BP when circuit topology forces noise gain < 5 - e.g., photodiode transimpedance amps or unity-gain followers driving long cables |
| ADA4898-1 | Bipolar input; 1.1nV/√Hz @ 10kHz; 2.5pA IB; unity-gain stable; 210MHz GBW; SOIC-8 | Better voltage noise but higher bias current - unsuitable for >1GΩ source impedances; requires careful power supply decoupling due to higher IQ | Choose ADA4898-1 only when voltage noise dominates system budget and source impedance < 100kΩ - avoid for piezoelectric or pH sensor interfaces |
Compared with OPA637BP, OPA627BP trades bandwidth and speed for universal stability, while ADA4898-1 offers superior noise performance at the cost of input bias current and compatibility with ultra-high-impedance nodes - making OPA637BP the optimal choice for gain ≥ 5 precision analog signal chains demanding both speed and FET-level input characteristics.
Availability
OPA637BP is available at Aetrix Electronics and suitable for precision instrumentation, fast data acquisition, and high-impedance sensor amplification requiring stable component supply across industrial and aerospace programs.
Supply support for OPA637BP 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 leader specializing in analog and embedded processing technologies, with over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPA637BP belongs to TI's OPA6x7 family of high-speed JFET op amps, designed specifically for applications demanding simultaneous low noise, low drift, high input impedance, and stable operation at moderate to high closed-loop gains.
FAQ
What is the minimum stable gain for OPA637BP?
The OPA637BP is specified as stable only at noise gain ≥ 5. This means it requires a minimum closed-loop gain of 5V/V in noninverting configuration or 4V/V in inverting configuration. Attempting unity-gain or gain-of-2 operation risks oscillation due to insufficient phase margin - always verify stability with SPICE simulation using TI's TINA model for OPA637BP before layout.
Can OPA637BP replace OPA627BP in an existing design?
No - OPA637BP cannot directly replace OPA627BP without circuit modification. The OPA627BP is unity-gain stable, while the OPA637BP requires minimum noise gain ≥ 5. Swapping them in a unity-gain follower or integrator will cause instability. Only consider replacement if your circuit's noise gain is ≥ 5 and you require faster settling (450ns vs 550ns) and higher bandwidth (80MHz vs 45MHz).
What package options are available for OPA637BP?
The OPA637BP is offered exclusively in the 8-pin SOIC (D) package per TI's official documentation and orderable part list. While the broader OPA637 family includes TO-99 (LMC) variants, the "BP" suffix specifically denotes the SOIC-8 version with industry-standard footprint and thermal resistance of RθJA = 107.9°C/W - no TO-99 or other package variants carry the BP designation.
How does OPA637BP handle capacitive loads?
The OPA637BP is characterized for stability into 30pF capacitive loads when configured at noise gain ≥ 5. For loads >30pF, isolation resistance (e.g., 10–50Ω in series with output) is required to maintain phase margin. Unlike some decompensated op amps, OPA637BP does not include internal capacitive-load drive enhancement - always simulate step response with realistic PCB trace capacitance before finalizing layout.
Is OPA637BP suitable for single-supply operation?
Yes - OPA637BP supports single-supply operation from 9V to 36V total supply (e.g., 0V and +15V), provided input common-mode voltage remains within specification (±11.5V relative to midsupply). However, its input stage is not rail-to-rail: inputs must stay ≥1.5V from either rail, and output swing is limited to ±11.5V into 1kΩ. For true single-supply signal conditioning, consider adding level-shifting or biasing networks.
OPA637BP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Difet®
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 135V/µs
- Gain Bandwidth Product:
- 80 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 40 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:
- 8-PDIP
OPA637BP FAQ
1.How can I place an order for OPA637BP through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA637BP 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 OPA637BP reliable?
The price and inventory of OPA637BP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA637BP is usually 5 days.
3.What payment methods are accepted for OPA637BP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA637BP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA637BP?
OPA637BP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA637BP 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 OPA637BP?
For technical support, including OPA637BP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA637BP requirements.
6.How does Aetrix verify that OPA637BP is sourced from the original manufacturer or authorized distributors?
All OPA637BP 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 OPA637BP meets industry standards.
7.What is the process for return or replacement of OPA637BP?
All OPA637BP units undergo pre-shipment inspection (PSI). If there is an issue with OPA637BP, 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 OPA637BP part is unused and in its original packaging.
Return procedure for OPA637BP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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