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Texas Instruments OPA657NB/250
- Part No.:
- OPA657NB/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
OPA657NB/250.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:501
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Product details
Overview
OPA657NB/250 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 in a 5-pin SOT-23 package, enabling wideband optical front ends with >10-MHz signal bandwidth up to 160 V/V gain.
For engineers reviewing the OPA657NB/250 datasheet, OPA657NB/250 pinout, OPA657NB/250 application, or OPA657NB/250 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 split-supply (±4 V to ±6 V) or single-supply (8 V to 12 V) compatibility - critical for photodetector, OTDR, and test equipment signal chains.
Technical Context
The OPA657NB/250 uses a high-speed complementary bipolar process with a low-noise JFET input stage, delivering exceptional voltage-noise-limited dynamic range. Its decompensated architecture enables 1.6-GHz gain-bandwidth product while maintaining DC precision: ±250 µV max input offset voltage and ±12 µV/°C drift over temperature.
It supports both noninverting (min gain +7) and inverting configurations, with 275-MHz bandwidth at G = +10 and 180-MHz large-signal bandwidth into 100-Ω load. Input impedance exceeds 1 TΩ || 0.7 pF, and output drives ±70 mA with 0.02-Ω closed-loop impedance at 0.1 MHz - essential for driving capacitive loads and ADC inputs without peaking.
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 (44 dB) without cascading stages |
| Small-Signal Bandwidth (G = +10) | 275 MHz - supports high-fidelity amplification of fast optical pulses and RF 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 - sets fundamental sensitivity limit for low-light photodiode detection |
| Input Bias Current | 2 pA - minimizes error in high-impedance transimpedance circuits with >100-kΩ feedback |
| Operating Supply | ±4 V to ±6 V (split) or 8 V to 12 V (single) - compatible with lab bench supplies and embedded power rails |
| Output Current Drive | ±70 mA - directly drives 50-Ω cables, ADC inputs, or moderate capacitive loads without buffering |
Pinout & Package
OPA657NB/250 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained optical sensor modules and portable test equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier output | Delivers full ±70 mA drive; requires external series resistor for 50-Ω cable matching per Figure 29 |
| 2 (–VS) | Negative power supply | Accepts –4 V to –6 V in split mode; must be decoupled with 0.1-µF ceramic capacitor near pin |
| 3 (IN+) | Noninverting input | High-impedance JFET node (1 TΩ || 0.7 pF); sensitive to layout parasitics above 100 MHz |
| 4 (IN–) | Inverting input | Feedback node; dominates transimpedance stability when used with photodiode anode connection |
| 5 (+VS) | Positive power supply | Accepts +4 V to +6 V in split mode; shares decoupling network with –VS for PSRR optimization |
Key Features
| Feature | Design Value |
|---|---|
| Decompensated stability | Minimum stable gain of +7 - enables higher GBP than unity-gain-stable alternatives like OPA656 |
| FET-input stage | 2 pA bias current and 4.8 nV/√Hz voltage noise - ideal for high-Z photodiode and piezoelectric sensors |
| Fast overdrive recovery | Sub-20 ns settling after saturation - maintains timing integrity in pulsed OTDR and LIDAR receivers |
| High-output current | ±70 mA drive into 100 Ω - eliminates need for external buffer when driving ADC front ends |
| ESD protection | ±2000 V HBM - robust handling during PCB assembly and optical module integration |
Applications
| Wideband Photodiode Amplifier | Optical Time Domain Reflectometry (OTDR) |
|---|---|
Use Scenario: Amplifying weak, nanosecond-scale photocurrent pulses from fiber-optic backscatter. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to voltage with minimal added noise. Use Value: 4.8 nV/√Hz input voltage noise and 2 pA bias current enable detection of sub-picoamp signals across 10-MHz bandwidth. |
Use Scenario: Generating and receiving high-resolution optical pulse echoes to locate fiber faults. IC Role / Device Role / Timing Role: Fast pulse amplifier in both transmit path (pulse shaping) and receive path (signal conditioning). Use Value: 700 V/µs slew rate and 180-MHz large-signal bandwidth preserve pulse edge fidelity for <1-m spatial resolution. |
| ADC Input Amplifier | Test and Measurement Front End |
Use Scenario: Driving high-speed analog-to-digital converters in digitizers and spectrum analyzers. IC Role / Device Role / Timing Role: Buffer and gain stage isolating source impedance from ADC input capacitance. Use Value: ±70 mA output drive and 0.02-Ω closed-loop output impedance ensure stable 12-bit+ ENOB at sampling rates >50 MSPS. |
Use Scenario: Signal conditioning in portable oscilloscopes and RF signal analyzers requiring low distortion. IC Role / Device Role / Timing Role: Wideband gain block in acquisition channel with calibrated DC offset and gain. Use Value: ±250 µV input offset and 70 dBc 2nd-harmonic distortion at 5 MHz support accurate amplitude measurement. |
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 |
|---|---|---|---|
| OPA656DBVT | Unity-gain stable; 230-MHz GBW; 7 nV/√Hz noise; ±10 pA bias current | Better DC precision and lower cost, but 3.5× lower bandwidth limits use in >50-MHz photodiode apps | Select OPA656DBVT only when gain ≤ +1 and bandwidth < 200 MHz suffices |
| LMH6629MF/NOPB | Bipolar input; 4 GHz GBW; 0.69 nV/√Hz noise; ±1.5 µA bias current | Superior voltage noise for ultra-low-light detection, but high bias current invalidates high-Z photodiode use | Choose LMH6629MF/NOPB only with low-impedance sources (<1 kΩ) and where bias current is not limiting |
Compared with OPA657NB/250, OPA656DBVT trades bandwidth for stability and cost, while LMH6629MF/NOPB sacrifices input impedance for lower voltage noise - making OPA657NB/250 uniquely balanced for high-Z, wideband transimpedance designs.
Availability
OPA657NB/250 is available at Aetrix Electronics and suitable for optical sensing, test instrumentation, and high-speed data acquisition systems requiring stable component supply, traceable lot control, and long-term industrial lifecycle support.
Supply support for OPA657NB/250 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/250 belongs to TI's precision high-speed amplifier portfolio, designed specifically for optical front-end and wideband measurement applications demanding simultaneous low noise, high bandwidth, and JFET-input DC accuracy.
FAQ
What is the minimum stable gain for OPA657NB/250?
The OPA657NB/250 is decompensated and requires a minimum noninverting gain of +7 for stable operation. Attempting unity-gain or G = +2 configurations risks oscillation. For lower gains, TI recommends the unity-gain-stable OPA656 or OPA659 - both share the same JFET input architecture but different compensation.
Can OPA657NB/250 operate from a single supply?
Yes, OPA657NB/250 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 AC-coupled inputs. Single-supply use reduces -PSRR impact but requires careful level-shifting; split-supply (±5 V) remains preferred for ground-referenced test equipment.
What is the maximum capacitive load OPA657NB/250 can drive?
OPA657NB/250 can drive up to 100 pF with proper external series resistance (RS) at the output. Figure 17 in the datasheet specifies RS = 1 kΩ for 100-pF loads to maintain phase margin. Driving >50 pF without RS causes peaking and potential instability - always verify stability with actual layout parasitics in simulation or bench testing.
How does OPA657NB/250 compare to OPA657U/2K5 in performance?
OPA657NB/250 and OPA657U/2K5 share identical electrical specifications and silicon die. The difference is packaging and reel size: NB/250 is 250-unit 7-inch tape-and-reel in SOT-23, while U/2K5 is 2500-unit 13-inch reel. Both meet the same AC/DC specs, thermal ratings, and reliability standards per SBOS197F.
Is OPA657NB/250 suitable for transimpedance amplifier designs?
Yes - OPA657NB/250 is explicitly optimized for transimpedance applications. Its 2 pA input bias current, 4.8 nV/√Hz voltage noise, and 1.6-GHz GBP enable high-gain (>106 V/A) photodiode amplifiers with >10-MHz bandwidth. Use with low-capacitance photodiodes and guard rings; stability depends on feedback resistor value and layout parasitics.
OPA657NB/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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/250 FAQ
1.How can I place an order for OPA657NB/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA657NB/250 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/250 reliable?
The price and inventory of OPA657NB/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA657NB/250 is usually 5 days.
3.What payment methods are accepted for OPA657NB/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA657NB/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA657NB/250?
OPA657NB/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA657NB/250 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/250?
For technical support, including OPA657NB/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA657NB/250 requirements.
6.How does Aetrix verify that OPA657NB/250 is sourced from the original manufacturer or authorized distributors?
All OPA657NB/250 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/250 meets industry standards.
7.What is the process for return or replacement of OPA657NB/250?
All OPA657NB/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA657NB/250, 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/250 part is unused and in its original packaging.
Return procedure for OPA657NB/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA657NB/250 Tags
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