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Texas Instruments OPA637SM
- Part No.:
- OPA637SM
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
OPA637SM.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,849
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Product details
Overview
OPA637SM from Texas Instruments is a precision high-speed JFET-input operational amplifier optimized for gain ≥ 5 configurations, delivering 80 MHz gain-bandwidth product, 135 V/µs slew rate, 450 ns settling time to 0.01%, and 4.5 nV/√Hz input voltage noise at 10 kHz - used in fast data acquisition front-ends and DAC output stages requiring low drift and high DC accuracy.
For engineers reviewing the OPA637SM datasheet, OPA637SM pinout, OPA637SM application, or OPA637SM equivalent, this page provides verified package mapping (SOIC-8), confirmed thermal metrics (RθJA = 107.9°C/W), exact gain-stability condition (stable only at noise gain ≥ 5), and validated alternative options for precision high-speed analog signal conditioning.
Technical Context
The OPA637SM employs dielectrically isolated complementary NPN/PNP process technology with laser-trimmed input circuitry to achieve ±100 µV max input offset voltage and ±0.8 µV/°C max drift across –55°C to +125°C. Its cascode input stage maintains ≤5 pA input bias current over ±11 V common-mode range while enabling FET-level impedance (10 TΩ || 7 pF) without sacrificing voltage noise performance.
Unlike the unity-gain stable OPA627, the OPA637SM uses internal compensation tailored for minimum noise gain of 5 - enabling higher bandwidth in noninverting ≥5× or inverting ≥4× configurations. Stability is preserved under load capacitance up to 30 pF when gain ≥ 5, but requires external compensation if used in unity-gain or capacitive-feedback topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-bandwidth product | 80 MHz at G = 10 - enables stable closed-loop bandwidth up to ~16 MHz in G = 5 configuration |
| Slew rate | 135 V/µs - supports full-scale 10 V step response within 75 ns, critical for pulse-amplifier and ADC driver applications |
| Settling time | 450 ns to 0.01% - ensures accurate sampling in 16-bit+ data acquisition systems with >1 MSPS throughput |
| Input voltage noise | 4.5 nV/√Hz at 10 kHz - matches best-in-class bipolar op amps while retaining FET input impedance advantages |
| Input bias current | ±5 pA max at TA = 25°C - allows use with >100 MΩ source impedances without significant DC error |
| Offset voltage drift | ±0.8 µV/°C max over –55°C to +125°C - guarantees <100 µV total drift across full industrial temperature range |
| Supply voltage range | ±4.5 V to ±18 V - supports dual-rail operation in legacy industrial instrumentation and high-voltage sensor interfaces |
Pinout & Package
OPA637SM is packaged in an 8-pin SOIC (D package) with standard pinout and no internal connections on pins 1, 5, and 8. The device requires external power decoupling at pins 4 (V–) and 7 (V+) and operates with inverting input on pin 2, noninverting input on pin 3, and output on pin 6.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 8 | NC | No internal connection - must be left floating; not usable as ground or bypass nodes |
| 2 | –IN | Inverting input - connects to feedback network; sensitive to stray capacitance due to high-Z FET input |
| 3 | +IN | Noninverting input - high-impedance node; layout requires guard ring to minimize leakage and EMI pickup |
| 4 | V– | Negative supply rail - requires local 0.1 µF ceramic + 10 µF tantalum decoupling to suppress PSRR degradation |
| 6 | OUT | Amplified output - capable of ±11.5 V swing into 1 kΩ; output impedance rises above 100 kHz due to open-loop rolloff |
| 7 | V+ | Positive supply rail - same decoupling requirement as V–; asymmetric supply (e.g., +15 V/–5 V) permitted per spec |
Key Features
| Feature | Design Value |
|---|---|
| Laser-trimmed input stage | Enables ±100 µV max VOS and ±0.8 µV/°C max drift - eliminates need for external nulling in most precision sensor interfaces |
| Gain ≥ 5 stability architecture | Permits 80 MHz GBW and 135 V/µs slew rate - delivers 2.5× higher bandwidth than unity-gain-stable OPA627 at same gain |
| Cascode FET input | Maintains ≤5 pA IB across ±11 V common-mode range - supports high-impedance photodiode and piezoelectric sensor amplification |
| Low 1/f noise corner | 0.6 µVPP (0.1–10 Hz) - ensures sub-LSB error in 20-bit precision measurement systems operating below 10 Hz |
| High PSRR & CMRR | 120 dB PSRR and 116 dB CMRR at DC - rejects supply ripple and common-mode interference in noisy industrial environments |
Applications
| High-Impedance Sensor Amplification | DAC Output Buffering |
|---|---|
|
Use Scenario: Amplifying signals from piezoelectric accelerometers or pH electrodes with source impedances >100 MΩ and DC-coupled output requirements. IC Role / Device Role / Timing Role: Precision DC-coupled transimpedance or noninverting amplifier operating at G = 10 with ±15 V supplies. Use Value: 5 pA max input bias current prevents >5 mV offset error; 0.8 µV/°C drift limits thermal-induced error to <100 µV over –55°C to +125°C. |
Use Scenario: Driving 16-bit DAC outputs into 50 Ω coaxial cables or anti-aliasing filters in automated test equipment. IC Role / Device Role / Timing Role: High-slew-rate output buffer configured as G = 1 follower with 30 pF load compensation. Use Value: 135 V/µs slew rate settles 10 V steps in <75 ns; 450 ns to 0.01% ensures monotonicity for 1 MSPS sampling. |
| Fast Data Acquisition Front-End | Active Filter Stage |
|
Use Scenario: First-stage gain block in digitizers capturing transient waveforms from ultrasound transducers or LIDAR receivers. IC Role / Device Role / Timing Role: G = 5 noninverting amplifier with 80 MHz GBW enabling >12 MHz small-signal bandwidth. Use Value: 4.5 nV/√Hz noise density preserves SNR in wideband acquisition; 450 ns settling meets 16-bit accuracy at 1.5 MSPS. |
Use Scenario: Second-order Sallen-Key low-pass filter stage in medical imaging signal chains requiring phase linearity and low distortion. IC Role / Device Role / Timing Role: Unity-gain stable topology avoided; instead used in G = 5 configuration to maintain 16 MHz filter cutoff. Use Value: 0.00003% THD+N at 1 kHz ensures minimal harmonic contamination; 116 dB CMRR rejects ECG/EEG common-mode artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA627SM | Unity-gain stable; lower GBW (45 MHz); slower settling (550 ns to 0.01%) | Required for G = 1, G = 2, or capacitive-feedback circuits where noise gain drops to 1 at HF | Select OPA627SM only when circuit topology mandates unity-gain stability - otherwise OPA637SM delivers superior speed and bandwidth |
| ADA4898-1ARMZ | Bipolar input; 1 GHz GBW; 250 V/µs slew; higher IB (±1.2 µA); narrower supply range (±5 V to ±12 V) | Better for ultra-high-speed, low-noise applications with low-source-impedance sensors (<1 kΩ) | Choose ADA4898-1ARMZ when bandwidth >100 MHz is required and source impedance is low; avoid for high-Z sensor interfaces |
Compared with OPA627SM and ADA4898-1ARMZ, the OPA637SM uniquely balances FET input impedance (≤5 pA IB), low 1/f noise (0.6 µVPP), and high-speed performance (80 MHz GBW, 450 ns settling) - making it optimal for precision wideband amplification where both DC accuracy and AC fidelity are critical.
Availability
OPA637SM is available at Aetrix Electronics and suitable for precision instrumentation, fast data acquisition, and DAC output buffering requiring stable component supply across extended temperature ranges (–55°C to +125°C).
Supply support for OPA637SM 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 op amps, data converters, and power management ICs.
The OPA637SM belongs to TI's OPA6x7 precision high-speed JFET op amp family, designed specifically for applications demanding simultaneous low noise, low drift, high input impedance, and wide bandwidth - such as medical imaging, test equipment, and scientific instrumentation.
FAQ
What is the minimum stable gain for OPA637SM?
The OPA637SM is specified as stable only at noise gain ≥ 5. This means it can be used in noninverting configurations with gain ≥ 5 or inverting configurations with |gain| ≥ 4. Using it at lower noise gains - including unity-gain buffers or integrators - risks oscillation and must be avoided unless externally compensated per TI's Application Report SBAA342.
Does OPA637SM support operation at –55°C?
Yes, the OPA637SM is rated for operation from –55°C to +125°C. Its electrical characteristics - including ±100 µV max input offset voltage, ±0.8 µV/°C max drift, and 80 MHz gain-bandwidth product - are guaranteed across this full extended temperature range, making it suitable for aerospace and downhole industrial applications.
Can OPA637SM drive heavy capacitive loads?
The OPA637SM is characterized for stability with up to 30 pF load capacitance when configured at noise gain ≥ 5. Driving heavier capacitive loads (e.g., >100 pF) requires isolation resistor (≥50 Ω) in series with the output or external compensation per Figure 7-2 in SBOS165C - otherwise peaking or ringing may occur.
How does OPA637SM compare to OPA627SM in noise performance?
Both OPA637SM and OPA627SM share identical noise specifications: 4.5 nV/√Hz at 10 kHz and 0.6 µVPP (0.1–10 Hz). Their voltage noise density and 1/f noise corner are indistinguishable - the key difference lies in gain stability architecture and resulting bandwidth, not noise floor.
Is pin 1 of OPA637SM connected internally?
No - pin 1 of the OPA637SM (SOIC-8 package) is a no-connect (NC) terminal with no internal connection. It must be left unconnected and floating; routing to ground or supply will not affect operation but violates recommended layout practice and may introduce parasitic coupling.
OPA637SM 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:
- -55°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-99-8
OPA637SM FAQ
1.How can I place an order for OPA637SM through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA637SM 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 OPA637SM reliable?
The price and inventory of OPA637SM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA637SM is usually 5 days.
3.What payment methods are accepted for OPA637SM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA637SM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA637SM?
OPA637SM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA637SM 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 OPA637SM?
For technical support, including OPA637SM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA637SM requirements.
6.How does Aetrix verify that OPA637SM is sourced from the original manufacturer or authorized distributors?
All OPA637SM 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 OPA637SM meets industry standards.
7.What is the process for return or replacement of OPA637SM?
All OPA637SM units undergo pre-shipment inspection (PSI). If there is an issue with OPA637SM, 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 OPA637SM part is unused and in its original packaging.
Return procedure for OPA637SM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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