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Texas Instruments OPA657NB/3KG4
- Part No.:
- OPA657NB/3KG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA657NB/3KG4.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,735
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Product details
Overview
OPA657NB/3KG4 from Texas Instruments is a 1.6-GHz gain-bandwidth, low-noise, FET-input voltage-feedback operational amplifier optimized for high-precision photodiode transimpedance and ADC driver applications. It delivers 275-MHz small-signal bandwidth at G = +10, 700 V/µs slew rate, and 4.8 nV/√Hz input voltage noise - enabling single-stage amplification of weak optical signals with >10-MHz usable bandwidth up to 160 V/V gain.
For engineers reviewing the OPA657NB/3KG4 datasheet, OPA657NB/3KG4 pinout, OPA657NB/3KG4 application, or OPA657NB/3KG4 equivalent, key selection criteria include its decompensated stability (minimum stable gain +7), ±2 pA input bias current, –40°C to +85°C operating range, and SOT-23-5 package compatibility with high-impedance, wideband signal chains in test equipment and optical sensing.
Technical Context
The OPA657NB/3KG4 uses a decompensated voltage-feedback architecture built on a high-speed complementary bipolar process with a low-noise JFET input stage. Its 1.6-GHz gain-bandwidth product enables high closed-loop bandwidths at gains ≥+7 while maintaining low distortion (–74 dBc 2nd-harmonic at 5 MHz) and fast overdrive recovery.
It supports both split-supply (±4 V to ±6 V) and single-supply (8 V to 12 V) operation. Input common-mode range extends to ±3.5 V with ±5-V supplies, output swing reaches ±3.3 V into 100 Ω, and it features internal ESD protection diodes rated for ±2000-V HBM - critical for photodiode front-end robustness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1.6 GHz - enables ≥10-MHz signal bandwidth at gains up to 160 V/V without cascading stages |
| Small-Signal Bandwidth (G = +10) | 275 MHz - supports high-fidelity amplification of fast pulses and RF-modulated optical signals |
| Slew Rate | 700 V/µs - preserves transient fidelity for 1-V step inputs with <1 ns rise time |
| Input Voltage Noise | 4.8 nV/√Hz - minimizes total input-referred noise in high-Z photodiode interfaces |
| Input Bias Current | 2 pA (typ) - maintains accuracy with photodiodes having >100-MΩ shunt resistance |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and embedded optical measurement systems |
| Supply Voltage Range | ±4 V to ±6 V (split) or 8 V to 12 V (single) - flexible lab and system-level power design |
Pinout & Package
SOT-23-5 surface-mount package (2.90 mm × 1.60 mm body size) with exposed pad for thermal performance. Pinout validated per TI SBOS197F datasheet Figure 6 (DBV package).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Drives 100-Ω loads to ±3.3 V; requires external series resistor for 50-Ω measurement matching |
| 2 (–VS) | Negative power supply | Accepts –4 V to –6 V in split mode; must be decoupled with 0.1 µF ceramic capacitor |
| 3 (IN+) | Noninverting input | High-impedance JFET node (10¹² Ω || 0.7 pF); sensitive to layout parasitics above 100 MHz |
| 4 (IN–) | Inverting input | Feedback node; parallel RF||RG ≤150 Ω required to avoid peaking above 30 MHz |
| 5 (+VS) | Positive power supply | Accepts +4 V to +6 V in split mode; ties to VCC in single-supply configurations |
Key Features
| Feature | Design Value |
|---|---|
| Low input voltage noise | 4.8 nV/√Hz enables sub-picoamp photocurrent detection with minimal added noise floor |
| High output drive capability | ±70 mA output current supports direct driving of 50-Ω cables or ADC input networks |
| Fast overdrive recovery | Recovery from saturation in <100 ns - essential for pulsed OTDR and time-domain reflectometry |
| Improved DC specs (high-grade variant) | ±0.1 mV max input offset and ±2 µV/°C drift - reduces calibration burden in precision analog front ends |
| ESD robustness | ±2000-V HBM rating protects against handling damage in optical module assembly |
Applications
| Wideband Photodiode Amplifier | ADC Input Amplifier |
|---|---|
Use Scenario: Amplifying low-level current from fiber-coupled InGaAs photodiodes in optical time-domain reflectometers (OTDR). IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with 200-kΩ feedback resistor and 10-MHz bandwidth. Use Value: 4.8 nV/√Hz input noise and 2 pA bias current yield 1.8 pA/√Hz total input-referred noise - enabling detection of sub-nW optical pulses. |
Use Scenario: Driving 14-bit, 100-MSPS SAR ADCs in automated test equipment requiring full-scale settling within 20 ns. IC Role / Device Role / Timing Role: High-fidelity buffer and gain stage preceding ADC sampling, configured for G = +10 noninverting operation. Use Value: 275-MHz bandwidth and 700 V/µs slew rate ensure <0.02% settling in 20 ns for 2-V steps - eliminating acquisition dead time. |
| Wafer Scanning Equipment | Test and Measurement Front End |
Use Scenario: Signal conditioning for laser-induced fluorescence detectors scanning semiconductor wafers at 100 kHz line rates. IC Role / Device Role / Timing Role: Low-noise preamplifier interfacing with high-impedance PMT anodes and feeding 500-MHz digitizers. Use Value: 1.6-GHz GBP allows stable G = +20 configuration delivering 90-MHz bandwidth - resolving nanosecond-scale emission transients. |
Use Scenario: Input stage of broadband oscilloscope front end covering DC to 200 MHz with calibrated gain accuracy. IC Role / Device Role / Timing Role: Precision gain block with matched 50-Ω input/output impedance using inverting G = –20 configuration. Use Value: Identical noise gain in inverting mode doubles effective GBP vs noninverting - achieving 250-MHz bandwidth at G = –20 without instability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-bandwidth, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA656IDBVR | Unity-gain stable; 230-MHz GBW; 7 nV/√Hz noise; higher DC precision (±0.25 mV offset) | Better for G = +1 to +5 photodiode amps where stability at low gain is required | Select when minimum gain < +7 is needed or lower noise at <10 MHz is prioritized over bandwidth |
| LMH6629MF/NOPB | Bipolar input; 4-GHz GBW; 0.69 nV/√Hz noise; ±10 mA output; not JFET-input | Superior voltage noise for ultra-low-noise DC-coupled amplifiers below 100 MHz | Choose for sub-nV/√Hz noise-critical applications with moderate source impedance (<1 kΩ) |
Compared with OPA657NB/3KG4, OPA656IDBVR trades 1.6-GHz bandwidth for unity-gain stability and lower DC error, while LMH6629MF/NOPB offers lower voltage noise but lacks JFET input benefits for high-impedance photodiode sources - making OPA657NB/3KG4 optimal for >10-MHz transimpedance gain stages.
Availability
OPA657NB/3KG4 is available at Aetrix Electronics and suitable for wideband photodiode amplifiers, high-speed ADC drivers, and optical time-domain reflectometry systems requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA657NB/3KG4 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 decades of expertise in high-performance op-amps and signal chain solutions.
The OPA657NB/3KG4 belongs to TI's precision high-speed op-amp portfolio, designed specifically for optical sensing, test instrumentation, and wideband data acquisition where low noise, high bandwidth, and JFET input integrity are mandatory.
FAQ
What is the minimum stable gain for OPA657NB/3KG4?
The OPA657NB/3KG4 is decompensated and requires a minimum closed-loop gain of +7 (noninverting) for stable operation. Attempting unity-gain or G = +2 configurations will cause peaking and potential oscillation. For lower gains, TI recommends the unity-gain stable OPA656 or OPA659. This gain constraint is inherent to its 1.6-GHz GBP optimization and is verified across temperature and supply conditions in the SBOS197F datasheet.
Does OPA657NB/3KG4 support single-supply operation?
Yes, OPA657NB/3KG4 supports single-supply operation from 8 V to 12 V. Input and output must be biased within the linear range - typically at VCC/2 using resistive dividers and coupling capacitors. Single-supply use minimizes –PSRR impact and simplifies power architecture, though split-supply (±5 V) is preferred for ground-referenced AC-coupled photodiode interfaces. All electrical specifications in the datasheet apply to both configurations.
What is the input capacitance of OPA657NB/3KG4?
The OPA657NB/3KG4 has differential input capacitance of 0.7 pF and common-mode input capacitance of 4.5 pF (typical, at 25°C). These values are critical for transimpedance stability: the inverting input's total capacitance (photodiode + layout + OPA657NB/3KG4) interacts with feedback resistance to set dominant pole frequency. Layout must minimize stray capacitance at IN– to preserve phase margin, especially with >100-kΩ RF.
How does OPA657NB/3KG4 compare to OPA657U/2K5 in performance?
OPA657NB/3KG4 and OPA657U/2K5 share identical AC and DC specifications - both are the same silicon die in SOT-23-5 packaging. The NB/3KG4 and U/2K5 part numbers denote different tape-and-reel packaging formats (3,000-unit reel vs. 250-unit reel) and moisture sensitivity level (MSL) handling, not functional differences. Electrical behavior, thermal performance, and pinout are fully interchangeable per TI's orderable addendum.
Is OPA657NB/3KG4 suitable for driving 50-Ω coaxial cables directly?
Yes, OPA657NB/3KG4 can drive 50-Ω loads directly with ±70 mA output current and ±3.3 V swing into 100 Ω (derating to ±2.8 V into 50 Ω). For optimal signal integrity, use a 50-Ω series resistor at the output pin to match cable impedance and suppress reflections - as shown in Figure 29 of SBOS197F. Avoid unterminated 50-Ω loads to prevent gain peaking and overshoot above 100 MHz.
OPA657NB/3KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 700V/µs
- Gain Bandwidth Product:
- 1.6 GHz
- -3db Bandwidth:
- 350 MHz
- Current - Input Bias:
- 1 pA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 14mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
OPA657NB/3KG4 FAQ
1.How can I place an order for OPA657NB/3KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA657NB/3KG4 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 OPA657NB/3KG4 reliable?
The price and inventory of OPA657NB/3KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA657NB/3KG4 is usually 5 days.
3.What payment methods are accepted for OPA657NB/3KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA657NB/3KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA657NB/3KG4?
OPA657NB/3KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA657NB/3KG4 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 OPA657NB/3KG4?
For technical support, including OPA657NB/3KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA657NB/3KG4 requirements.
6.How does Aetrix verify that OPA657NB/3KG4 is sourced from the original manufacturer or authorized distributors?
All OPA657NB/3KG4 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 OPA657NB/3KG4 meets industry standards.
7.What is the process for return or replacement of OPA657NB/3KG4?
All OPA657NB/3KG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA657NB/3KG4, 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 OPA657NB/3KG4 part is unused and in its original packaging.
Return procedure for OPA657NB/3KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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