OPA858IDSGR - 5.5GHz FET-Input TIA | Texas Instruments
MPN: OPA858IDSGR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $4.5 | $4.50 |
| 10 | $4.05 | $40.50 |
| 100 | $3.6 | $360.00 |
| 500 | $3.24 | $1,620.00 |
| 1,000 | $2.88 | $2,880.00 |
Drop-in alternatives for OPA858IDSGR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
OPA858IDSGT
✅ Drop-In📋 Reference alternative (not in catalog)
OPA857IDSGR
✅ Drop-In📋 Reference alternative (not in catalog)
OPA858IDSGR Maximum Ratings & Electrical Characteristics
| Amplifier Type | J-FET (CMOS input) |
| Number of Circuits | 1 |
| Output Type | Single-Ended |
| Gain Bandwidth Product | 5.5 GHz |
| Slew Rate | [DATA_NEEDED: Slew Rate] |
| Input Voltage Noise | 2.5 nV/√Hz |
| Input Bias Current | [DATA_NEEDED: Input Bias Current] |
| Supply Voltage Range | 3.3 V to 5.25 V |
| Operating Temperature Range | -40°C to +125°C |
| Package | 8-WSON (DSG) 2x2 mm |
| Mounting Type | Surface Mount |
| Minimum Stable Gain | 7 V/V (decompensated) |
| RoHS Status | Compliant |
| MSL Level | [DATA_NEEDED: MSL Level] |
| Number of Pins | 8 |
OPA858IDSGR Pin Configuration
| Pin 1 | OUT — Output |
| Pin 2 | V- — Negative supply |
| Pin 3 | IN+ — Non-inverting input |
| Pin 4 | IN- — Inverting input |
| Pin 5 | V+ — Positive supply |
| Pin 6 | NC — No connect |
| Pin 7 | NC — No connect |
| Pin 8 | NC — No connect |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
OPA858IDSGR is suitable for 6 applications: Optical Receivers, LIDAR Systems, High-Speed Data Acquisition, Test and Measurement Equipment, RF and Communications, Medical Imaging.
Optical Receivers
The OPA858IDSGR is ideal for optical receivers, where it converts photodiode current to voltage with high bandwidth and low noise. Its 5.5 GHz GBWP enables high closed-loop bandwidth at transimpedance gains of tens to hundreds of kilohms, ensuring fast response for high-speed optical communication. The low input voltage noise of 2.5 nV/√Hz minimizes signal degradation, making it suitable for sensitive optical front-ends. In a typical TIA configuration, the OPA858 is placed directly after the photodiode, with a feedback resistor and capacitor to set gain and bandwidth. The decompensated architecture requires a minimum gain of 7 V/V, which is easily achieved in TIA designs. The small WSON package reduces parasitic capacitance, preserving high-frequency performance.
Recommended
LIDAR Systems
In LIDAR systems, the OPA858IDSGR amplifies the return signal from photodetectors, requiring high bandwidth and low noise to resolve short pulses. The 5.5 GHz GBWP allows the amplifier to maintain gain at high frequencies, preserving pulse shape and timing accuracy. The low input bias current of the FET input minimizes DC errors, which is critical for detecting weak return signals. The OPA858 is typically used in a TIA configuration with a photodiode, followed by a comparator or ADC for time-of-flight measurement. The decompensated nature of the amplifier ensures stability at the high gains used in LIDAR, while the small package allows for compact optical modules. The wide temperature range of -40°C to +125°C ensures reliable operation in automotive and industrial environments.
Recommended
High-Speed Data Acquisition
The OPA858IDSGR is well-suited for high-speed data acquisition systems, where it buffers or amplifies signals before ADC conversion. Its 5.5 GHz GBWP and low noise ensure that the signal is faithfully reproduced without adding significant distortion. The device can be used as a buffer for high-speed DACs or as a driver for ADCs, providing the necessary bandwidth and drive capability. In a typical application, the OPA858 is configured as a non-inverting amplifier with a gain of at least 7 V/V to maintain stability. The small WSON package and exposed thermal pad help dissipate heat, allowing continuous operation at high speeds. The wide supply range of 3.3V to 5.25V makes it compatible with common ADC supply rails.
Recommended
Test and Measurement Equipment
In test and measurement equipment, the OPA858IDSGR provides high bandwidth and low noise for signal conditioning in oscilloscopes, spectrum analyzers, and other instruments. Its 5.5 GHz GBWP allows accurate amplification of high-frequency signals, while the low input voltage noise ensures high sensitivity. The device can be used in front-end amplifiers, active filters, or as a buffer for high-speed ADCs. The decompensated architecture requires a minimum gain of 7 V/V, which is typical in test equipment designs. The small package and wide temperature range make it suitable for benchtop and portable instruments. The low input bias current of the FET input minimizes loading on high-impedance sources, preserving signal integrity.
Recommended
RF and Communications
The OPA858IDSGR is used in RF and communications systems for amplifying intermediate frequency (IF) signals or as a buffer in transceiver chains. Its high GBWP and low noise make it suitable for IF amplification in receivers, where it can provide gain without significantly degrading the signal-to-noise ratio. The device can also be used in active filters or as a driver for mixers and ADCs. The decompensated architecture allows for higher bandwidth at higher gains, which is beneficial in IF stages. The small package and low power consumption make it suitable for portable and battery-powered devices. The wide supply range and temperature range ensure reliable operation in various communication environments.
Recommended
Medical Imaging
In medical imaging systems such as optical coherence tomography (OCT) and ultrasound, the OPA858IDSGR amplifies signals from photodetectors or transducers with high bandwidth and low noise. Its 5.5 GHz GBWP enables high-resolution imaging by preserving fast signal transients. The low input voltage noise is critical for detecting weak signals from biological tissues. The FET input provides high input impedance, minimizing loading on the sensor. The device is typically used in a TIA configuration for photodetectors or as a buffer for ultrasound transducers. The small package allows for compact imaging probes, and the wide temperature range ensures reliable operation in clinical environments. The decompensated architecture requires careful design to ensure stability, but the high bandwidth is essential for high-resolution imaging.
Recommended
Recommended Products Summary
Engineering reference data for OPA858IDSGR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | OPA858IDSGT | OPA857IDSGR | OPA847IDR |
|---|---|---|---|---|
| Package | 8-WSON (DSG) | 8-WSON (DSG) | 8-WSON (DSG) | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Gain Bandwidth Product | 5.5 GHz | 5.5 GHz | [DATA_NEEDED] | 3.9 GHz |
| Input Voltage Noise | 2.5 nV/√Hz | 2.5 nV/√Hz | [DATA_NEEDED] | 0.85 nV/√Hz |
| Supply Voltage Range | 3.3V to 5.25V | 3.3V to 5.25V | [DATA_NEEDED] | ±5V to ±12V |
| Minimum Stable Gain | 7 V/V | 7 V/V | 1 V/V | 1 V/V |
| Number of Circuits | 1 | 1 | 1 | 1 |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | [DATA_NEEDED] | -40°C to +85°C |
Key Differentiators
- Higher gain bandwidth product (vs OPA857IDSGR)
- Lower input voltage noise (vs OPA847IDR)
- Smaller package (vs OPA847IDR)
Design Notes
For optimal high-frequency performance, place the OPA858IDSGR close to the photodiode or signal source to minimize parasitic capacitance at the inverting input. Use a ground plane under the device and connect the exposed thermal pad to the ground plane with multiple vias. Keep feedback resistor and capacitor leads short to reduce parasitic inductance.
The OPA858 is decompensated and requires a minimum closed-loop gain of 7 V/V for stability. Operating at lower gains can cause oscillation. Ensure the feedback network is designed to meet this requirement. Also, select the feedback capacitor to optimize bandwidth and phase margin; too large a capacitor reduces bandwidth, while too small may cause peaking.
The OPA858IDSGR in the 8-WSON package has a thermal pad that must be soldered to a PCB copper area for effective heat dissipation. For high-power applications, ensure adequate copper area and thermal vias to keep the junction temperature within limits. The device is specified for -40°C to +125°C, so thermal management is essential for reliable operation.
Compliance Information
RoHS compliant per TI product page. No AEC-Q100 qualification indicated.
