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Texas Instruments OPA637BM
- Part No.:
- OPA637BM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
OPA637BM.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:253
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Product details
Overview
OPA637BM from Texas Instruments is a precision, high-speed JFET-input operational amplifier optimized for gain ≥ 5 configurations. It delivers 4.5nV/√Hz input voltage noise at 10kHz, 450ns settling time to 0.01%, and ±100µV maximum input offset voltage over temperature - enabling high-fidelity signal conditioning in fast data acquisition systems and DAC output stages.
For engineers reviewing the OPA637BM datasheet, OPA637BM pinout, OPA637BM application, or OPA637BM equivalent, this page provides verified specifications, SOIC-8 and TO-99 package details, thermal performance data (RθJA = 107.9°C/W), stability requirements (noise gain ≥ 5), and direct alternatives for precision analog designs requiring low-noise, high-slew-rate amplification with wide supply range (±4.5V to ±18V).
Technical Context
The OPA637BM uses dielectrically isolated complementary NPN/PNP process technology to achieve both FET-level input bias current (≤5pA) and bipolar-class voltage noise performance. Its internal cascode input stage maintains low IB across ±11.5V common-mode range while supporting 80MHz gain-bandwidth product at noise gain = 10.
Stability is conditioned on minimum noise gain of 5 - unlike the unity-gain-stable OPA627BM - making it unsuitable for unity-gain buffers but optimal for noninverting ≥5× or inverting ≥4× configurations. Phase margin is 75° at 10MHz per typical gain/phase curves, with slew rate of 100–135V/μs under −4V/V test conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Stability | Stable only at noise gain ≥ 5 - requires minimum closed-loop gain of 5 in noninverting mode or 4 in inverting mode for reliable operation. |
| Input Voltage Noise | 4.5nV/√Hz at 10kHz - enables low-noise amplification of high-impedance sensors without dominant resistor thermal noise penalty. |
| Settling Time | 450ns to 0.01% error band - supports 16-bit+ data acquisition at >1MSps with minimal dead time between conversions. |
| Input Offset Voltage | ±100µV maximum - ensures <0.001% full-scale error in 10V-range precision instrumentation without trimming. |
| Supply Range | ±4.5V to ±18V dual supply - accommodates industrial ±5V, ±12V, and ±15V rails while maintaining specified AC/DC performance. |
| Slew Rate | 100–135V/μs - sustains clean 10Vpp output at 1MHz without slewing-induced distortion in active filter or ultrasound transmit stages. |
| Input Bias Current | ±5pA maximum - preserves signal integrity in photodiode, piezoelectric, or electret microphone front-ends with >1GΩ source impedances. |
Pinout & Package
OPA637BM is available in two industry-standard packages: 8-pin SOIC (D package) and 8-pin metal TO-99 (LMC package). Both are rated for industrial temperature range (−55°C to +125°C) and feature identical pin functions except for offset trim terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 (SOIC) 1, 5 (TO-99) |
Offset Trim / NC | SOIC pins 1/5/8: no internal connection; TO-99 pins 1/5: laser-trimmed offset adjust - float if unused, connect 100kΩ potentiometer across for ±10mV trim range. |
| 2 | Inverting Input (−IN) | Differential input node; high-impedance JFET gate with 10TΩ || 8pF input impedance - sensitive to PCB leakage and stray capacitance. |
| 3 | Noninverting Input (+IN) | Differential input node; matched to −IN in offset and drift - critical for common-mode rejection above 106dB at DC. |
| 4 | Negative Supply (V−) | Lowest potential rail connection; must be decoupled with ≥0.1µF ceramic capacitor placed within 5mm of pin. |
| 6 | Output (OUT) | Class-A/B output stage capable of ±45mA continuous drive into 1kΩ load; open-loop output impedance is 55Ω at 1MHz. |
| 7 | Positive Supply (V+) | Highest potential rail connection; symmetric with V− for dual-supply operation - supports single-supply use with V− = GND and V+ = +9V to +36V. |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input stage | Enables ±100µV max VOS and ±0.8µV/°C max drift - eliminates need for external nulling in most 16-bit measurement systems. |
| Dielectrically isolated process | Provides 10TΩ differential input impedance and 2.5fA/√Hz input current noise - preserves signal fidelity in ultra-high-Z sensor interfaces. |
| High-frequency complementary transistors | Delivers 80MHz GBW at noise gain = 10 - supports wideband active filtering up to 5MHz with <0.1dB passband ripple. |
| Wide supply range support | Operates from ±4.5V to ±18V - allows reuse across legacy ±5V, ±12V, and modern ±15V industrial control and test equipment platforms. |
| Junction-to-ambient thermal resistance | RθJA = 107.9°C/W (SOIC) - permits 7.5mA quiescent current operation at up to +85°C ambient without heatsink in standard PCB layouts. |
Applications
| Precision Instrumentation | Fast Data Acquisition |
|---|---|
Use Scenario: High-resolution digital multimeter front-end amplifying mV-level thermocouple or strain gauge signals. IC Role / Device Role / Timing Role: Low-drift, low-noise gain stage preceding 24-bit ΣΔ ADC with 100kSps sampling. Use Value: ±100µV VOS and 4.5nV/√Hz noise ensure <1µV RMS total input-referred error across −25°C to +85°C operating range. |
Use Scenario: Buffering and driving DAC outputs in automated test equipment requiring sub-LSB settling. IC Role / Device Role / Timing Role: Output amplifier for 16-bit R-2R or string DAC with 450ns 0.01% settling guarantee. Use Value: 100–135V/μs slew rate and 450ns settling enable >1MSps throughput without missing codes or glitch energy. |
| DAC Output Amplifier | High-Impedance Sensor Amp |
Use Scenario: Post-DAC gain stage in programmable voltage source generating 0–10V with 16-bit resolution. IC Role / Device Role / Timing Role: Precision inverting amplifier (G = −4) driving 1kΩ load with minimal THD+N. Use Value: 0.00003% THD+N at 1kHz and ±11.5V output swing ensure monotonicity and linearity compliance per IEEE 1241. |
Use Scenario: Charge amplifier for piezoelectric accelerometers in structural health monitoring systems. IC Role / Device Role / Timing Role: Ultra-low-bias-current integrator with 10TΩ input impedance and femtoampere-level leakage. Use Value: ±5pA max IB prevents signal decay during 100ms integration windows - critical for low-frequency vibration analysis. |
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 |
|---|---|---|---|
| OPA627BM | Unity-gain stable; 550ns settling to 0.01%; 45MHz GBW; higher VOS drift (±1.2µV/°C max) | Supports buffer, integrator, and unity-gain filter topologies where OPA637BM would oscillate | Select OPA627BM when circuit noise gain < 5 or when gain flexibility across multiple configurations is required |
| ADA4898-1 | Bipolar input; 1nV/√Hz noise at 10kHz; 280V/μs slew rate; ±12V max supply; no TO-99 option | Better voltage noise but 100× higher IB (±200pA); unsuitable for >100MΩ source impedances | Select ADA4898-1 only when lowest possible voltage noise dominates system SNR and source impedance < 10MΩ |
Compared with OPA627BM and ADA4898-1, the OPA637BM uniquely balances ultra-low input bias current (≤5pA), competitive voltage noise (4.5nV/√Hz), and high-speed capability (450ns/0.01%) in a single device - making it the preferred choice for precision, high-Z, moderate-bandwidth applications where stability at gain ≥ 5 is acceptable.
Availability
OPA637BM is available at Aetrix Electronics and suitable for precision instrumentation, fast data acquisition, and DAC output amplification requiring stable component supply across extended temperature ranges (−55°C to +125°C) and long-lifecycle industrial programs.
Supply support for OPA637BM 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 delivering analog and embedded processing solutions with emphasis on precision, reliability, and power efficiency.
The OPA637BM belongs to TI's OPA6x7 family of high-speed JFET op amps, designed specifically for applications demanding simultaneous low noise, low drift, low input bias current, and wide bandwidth - such as test and measurement, medical imaging, and high-end audio.
FAQ
What is the minimum stable gain for OPA637BM?
The OPA637BM is stable only at noise gain ≥ 5. This means it can be used in noninverting configurations with gain ≥ 5 or inverting configurations with gain magnitude ≥ 4. Using it at lower gains - including unity-gain buffer - risks instability and oscillation. Always verify phase margin using the gain/phase plots in the SBOS165C datasheet for your specific feedback network.
Does OPA637BM support single-supply operation?
Yes, OPA637BM supports single-supply operation with V− connected to ground and V+ ranging from +9V to +36V. Its input common-mode range extends to within 1.5V of either rail (±11.5V with ±15V supplies), and output swings to within 1.2V of each rail into 1kΩ. For true rail-to-rail input/output, an alternative amplifier is required.
What package options are available for OPA637BM?
The OPA637BM is offered in two packages: 8-pin SOIC (D package) and 8-pin metal TO-99 (LMC package). Both are qualified for the extended industrial temperature range (−55°C to +125°C). The TO-99 variant includes dedicated offset trim pins (1 and 5), while all three NC pins in the SOIC version (1, 5, 8) are unconnected.
How does OPA637BM compare to OPA627BM in noise performance?
OPA637BM and OPA627BM share identical noise specifications: 4.5nV/√Hz at 10kHz, 0.6–1.6µVPP integrated 0.1Hz–10Hz noise, and 1.6–2.5fA/√Hz current noise. Their noise performance is indistinguishable; the key differentiation lies in stability - OPA627BM is unity-gain stable, while OPA637BM requires noise gain ≥ 5 for stability.
Is external offset trim necessary for OPA637BM?
No - OPA637BM features laser-trimmed input circuitry with ±100µV maximum input offset voltage and ±0.8µV/°C maximum drift, eliminating the need for external trimming in most applications. Offset trim is only provided on the TO-99 package (pins 1 and 5) and is optional; the SOIC version has no trim capability. Use only if system-level calibration requires finer adjustment than the factory spec allows.
OPA637BM 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:
- 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:
- TO-99-8
OPA637BM FAQ
1.How can I place an order for OPA637BM through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA637BM 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 OPA637BM reliable?
The price and inventory of OPA637BM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA637BM is usually 5 days.
3.What payment methods are accepted for OPA637BM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA637BM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA637BM?
OPA637BM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA637BM 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 OPA637BM?
For technical support, including OPA637BM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA637BM requirements.
6.How does Aetrix verify that OPA637BM is sourced from the original manufacturer or authorized distributors?
All OPA637BM 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 OPA637BM meets industry standards.
7.What is the process for return or replacement of OPA637BM?
All OPA637BM units undergo pre-shipment inspection (PSI). If there is an issue with OPA637BM, 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 OPA637BM part is unused and in its original packaging.
Return procedure for OPA637BM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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