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Texas Instruments OPA657UBG4
- Part No.:
- OPA657UBG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA657UBG4.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,259
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Product details
Overview
OPA657UBG4 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 signal bandwidth up to 160 V/V gain.
For engineers reviewing the OPA657UBG4 datasheet, OPA657UBG4 pinout, OPA657UBG4 application, or OPA657UBG4 equivalent, this page provides verified specifications, SOIC-8 package mapping, confirmed photodiode/OTDR/test-equipment use cases, and two validated alternative parts with documented functional trade-offs.
Technical Context
The OPA657UBG4 uses a decompensated voltage-feedback architecture with a low-noise JFET input stage fabricated on a high-speed complementary bipolar process. Its 1.6-GHz gain-bandwidth product enables stable operation at minimum noninverting gain of +7, supporting wideband transimpedance configurations up to 200-kΩ feedback resistance.
It operates from ±4 V to ±6 V supplies, features 2 pA typical input bias current, 10¹² Ω || 0.7 pF differential input impedance, and fast overdrive recovery - critical for pulsed optical front ends and high-fidelity test instrumentation where signal fidelity and dynamic range are constrained by voltage noise and bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1.6 GHz - enables ≥10-MHz closed-loop bandwidth at gains up to 160 V/V (44 dB) without cascading stages |
| Small-Signal Bandwidth (G = +10) | 275 MHz - supports high-fidelity amplification of fast analog waveforms in test equipment front ends |
| Slew Rate | 700 V/µs - preserves transient integrity for 2-V step signals with <20 ns settling to 0.02% |
| Input Voltage Noise | 4.8 nV/√Hz - minimizes total input-referred noise in photodiode applications with 10-MHz bandwidth |
| Input Bias Current | 2 pA - enables high-impedance sensor interfacing (e.g., 200-kΩ transimpedance) without DC error degradation |
| Output Current Drive | ±70 mA - drives 100-Ω loads while maintaining linearity and harmonic distortion < –70 dBc at 5 MHz |
| Operating Temperature Range | –40°C to +85°C - qualified for industrial and embedded optical measurement systems |
Pinout & Package
OPA657UBG4 is supplied in an 8-pin SOIC (D package), body size 4.90 mm × 3.91 mm, with exposed pad not present. Thermal resistance RθJA = 125°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected; must be left floating or tied to ground per layout guidelines |
| 2 | Inverting Input (VIN–) | High-impedance node for feedback network connection; sensitive to parasitic capacitance |
| 3 | Noninverting Input (VIN+) | DC-biased reference point; requires low-impedance source to minimize noise coupling |
| 4 | Negative Supply (–VS) | Return path for internal biasing; must be decoupled with 0.1 µF ceramic capacitor close to pin |
| 5 | Output (VOUT) | Capable of ±70 mA drive into 100-Ω load; output impedance < 0.02 Ω at 0.1 MHz |
| 6 | No Connection | Internally unconnected; no external connection required |
| 7 | Positive Supply (+VS) | Primary power rail; requires local 0.1 µF + 6.8 µF decoupling for broadband stability |
| 8 | No Connection | Internally unconnected; must remain unconnected per device functional specification |
Key Features
| Feature | Design Value |
|---|---|
| Low-input voltage noise | 4.8 nV/√Hz - enables detection of sub-picoamp photocurrents in 10-MHz bandwidth OTDR receivers |
| High gain-bandwidth stability | Stable at G ≥ +7 - eliminates need for external compensation in most transimpedance designs |
| Fast overdrive recovery | Recovery time < 20 ns after 5-V overdrive - maintains timing accuracy in pulsed laser diode monitoring |
| High-output current | ±70 mA - directly drives 50-Ω coaxial cables or ADC input buffers without external buffering |
| ESD robustness | ±2000 V HBM - withstands handling and board-level ESD events in production test environments |
Applications
| Wideband Photodiode Amplifier | Optical Time Domain Reflectometry (OTDR) |
|---|---|
|
Use Scenario: Amplifying nanoamp-level photocurrents from fiber-coupled PIN diodes in real-time fault-location systems. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photocurrent to voltage with minimal added noise and phase delay. Use Value: 4.8 nV/√Hz input voltage noise and 2 pA bias current yield 1.8 pA/√Hz total input-referred noise over 10-MHz bandwidth - improving dynamic range by >12 dB vs legacy op amps. |
Use Scenario: Detecting backscattered light pulses in single-mode fiber for distance-resolved loss measurement. IC Role / Device Role / Timing Role: High-speed front-end amplifier capturing nanosecond-scale return pulses with sub-ns rise time preservation. Use Value: 700 V/µs slew rate and 275-MHz bandwidth at G = +10 ensure faithful reproduction of 2-ns optical pulses - reducing pulse broadening and location uncertainty. |
| ADC Input Amplifier | Test and Measurement Front End |
|
Use Scenario: Driving 12–16-bit, 10–50 MSPS analog-to-digital converters in portable spectrum analyzers. IC Role / Device Role / Timing Role: Gain stage and buffer isolating sensor signal chain from ADC input capacitance and nonlinearities. Use Value: ±70 mA output drive and 0.02 Ω closed-loop output impedance maintain SFDR > 70 dBc into 100-Ω ADC inputs - preventing gain flatness degradation above 10 MHz. |
Use Scenario: Signal conditioning in automated test equipment for semiconductor parametric testing. IC Role / Device Role / Timing Role: Precision gain block for sourcing calibrated voltage/current stimuli with low THD. Use Value: –74 dBc 2nd-harmonic distortion at 5 MHz and 2-Vpp output ensures accurate stimulus fidelity - critical for measuring DUT linearity without amplifier-induced error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-bandwidth, low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA656IDBVR | Unity-gain stable; 230-MHz GBW; 7 nV/√Hz noise; 290 V/µs slew rate | Supports G = +1 configurations; lower bandwidth/noise performance limits photodiode SNR at >5 MHz | Choose when unity-gain operation or lower quiescent current (11.7 mA) is required over bandwidth |
| OPA857IRGTR | Integrated transimpedance amplifier; 4.75-GHz GBW; no user-configurable feedback; fixed 5-kΩ/20-kΩ gain options | Designed specifically for photodiode interfaces; lacks general-purpose op amp flexibility | Choose when photodiode transimpedance function is sole requirement and PCB space is constrained |
Compared with OPA657UBG4, OPA656IDBVR trades 1.6-GHz bandwidth and 4.8-nV/√Hz noise for unity-gain stability and lower power, while OPA857IRGTR replaces configurability with integrated photodiode optimization - making OPA657UBG4 the only part balancing ultra-wideband precision, FET-input DC accuracy, and flexible gain configuration.
Availability
OPA657UBG4 is available at Aetrix Electronics and suitable for optical time-domain reflectometry, wafer scanning equipment, and high-precision ADC driving applications requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA657UBG4 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 high-performance op amps, data converters, and signal-chain solutions.
The OPA657UBG4 belongs to TI's precision high-speed amplifier product line, engineered for optical sensing, test instrumentation, and wideband signal acquisition where low noise, high bandwidth, and JFET-input DC accuracy are simultaneously required.
FAQ
What is the minimum stable gain for OPA657UBG4?
The OPA657UBG4 is decompensated and specified for stable operation at noninverting gain ≥ +7. Attempting unity-gain or G = +2 configurations risks peaking and oscillation. For lower gains, TI recommends the unity-gain stable OPA656 or OPA659. This gain constraint is inherent to its 1.6-GHz gain-bandwidth architecture and is verified across temperature and supply conditions in the official SBOS197F datasheet.
Does OPA657UBG4 support single-supply operation?
Yes - the OPA657UBG4 can operate from a single 8-V to 12-V supply, provided input and output common-mode voltages remain within linear range (e.g., biased at VCC/2). Its split-supply specification (±4 V to ±6 V) does not preclude single-rail use; however, PSRR asymmetry means –PSRR is minimized when the negative rail is grounded. This configuration is validated in Section 8.3.2 of the SBOS197F datasheet.
What is the input bias current specification for OPA657UBG4 at 85°C?
At TA = –40°C to +85°C, the maximum input bias current for OPA657UBG4 is ±5000 pA (5 nA), per Electrical Characteristics Table 7.5 in SBOS197F. At 25°C, it is ±2 pA typical. This 3-order-of-magnitude increase reflects JFET gate leakage behavior and must be accounted for in high-impedance transimpedance designs operating at elevated ambient temperatures.
Can OPA657UBG4 drive a 50-Ω load directly?
Yes - the OPA657UBG4 delivers ±70 mA output current and specifies voltage swing of ±3.3 V into 100 Ω. Into 50 Ω, it sustains ±3.1 V at TA = –40°C to +85°C. Its closed-loop output impedance is 0.02 Ω at 0.1 MHz, ensuring minimal mismatch loss and return loss < –20 dB - making it suitable for direct 50-Ω cable driving in test equipment and OTDR front ends without external buffers.
Is OPA657UBG4 pin-compatible with other OPA65x-series devices?
No - OPA657UBG4 uses an 8-pin SOIC package with pins 1, 6, and 8 designated as No Connection. In contrast, OPA656IDBVR uses a 5-pin SOT-23 package, and OPA857IRGTR uses a 16-pin QFN. There is no pin-to-pin compatibility across the OPA65x family; each variant has distinct pin count, function mapping, and package footprint - requiring separate PCB layouts for each device.
OPA657UBG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
- 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:
- 8-SOIC
OPA657UBG4 FAQ
1.How can I place an order for OPA657UBG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA657UBG4 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 OPA657UBG4 reliable?
The price and inventory of OPA657UBG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA657UBG4 is usually 5 days.
3.What payment methods are accepted for OPA657UBG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA657UBG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA657UBG4?
OPA657UBG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA657UBG4 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 OPA657UBG4?
For technical support, including OPA657UBG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA657UBG4 requirements.
6.How does Aetrix verify that OPA657UBG4 is sourced from the original manufacturer or authorized distributors?
All OPA657UBG4 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 OPA657UBG4 meets industry standards.
7.What is the process for return or replacement of OPA657UBG4?
All OPA657UBG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA657UBG4, 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 OPA657UBG4 part is unused and in its original packaging.
Return procedure for OPA657UBG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA657UBG4 Tags
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