My Inquiry
My Account
Texas Instruments OPA842IDG4
- Part No.:
- OPA842IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA842IDG4.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,521
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA842IDG4 from Texas Instruments is a unity-gain stable, voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning. It delivers 400MHz unity-gain bandwidth, 2.6nV/√Hz input voltage noise, –93dBc harmonic distortion at 5MHz, and 22ns 0.01% settling time - enabling precision buffering of 14-bit, 10MSPS ADCs like the ADS850 in professional video and test instrumentation.
For engineers reviewing the OPA842IDG4 datasheet, OPA842IDG4 pinout, OPA842IDG4 application, or OPA842IDG4 equivalent, key selection criteria include its ±5V operation, SO-8 package thermal performance (125°C/W), differential gain/phase error (0.003%/0.008°), and verified stability with capacitive loads up to 100pF when using recommended series isolation resistors.
Technical Context
The OPA842IDG4 employs a two-stage voltage-feedback architecture that enables unity-gain stability while achieving 200MHz gain-bandwidth product and 110dB open-loop gain. Its differential input stage provides high CMRR (95dB) and low input bias current (±20µA max), supporting precision dc-coupled configurations.
It features fast slew rate (400V/µs min), low output impedance (380µΩ at 1kHz), and robust drive capability (±100mA output current). The device maintains <0.1dB gain flatness to 56MHz at G=+2 and supports stable operation into 100pF capacitive loads when paired with an external series resistor per Figure 15.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 400MHz - enables stable G=+1 operation with full small-signal bandwidth for wideband transimpedance or unity-gain line drivers. |
| Gain-Bandwidth Product | 200MHz - defines closed-loop bandwidth limit (e.g., ~100MHz at G=+2) for predictable frequency response design. |
| Input Voltage Noise | 2.6nV/√Hz - ensures minimal added noise in low-level signal amplification, critical for 14-bit ADC interface SNR preservation. |
| Harmonic Distortion | –93dBc (2nd/3rd, 5MHz, RL=500Ω) - meets professional video and instrumentation THD requirements without post-filtering. |
| Settling Time | 22ns to 0.01% - supports accurate sampling of fast transient signals in 10MSPS data acquisition systems. |
| Differential Gain/Phase | 0.003%/0.008° (NTSC, RL=150Ω) - satisfies broadcast-grade video line driving specifications for composite signal integrity. |
| Supply Voltage Range | ±3.5V to ±6V - allows flexible rail selection; specified performance at ±5V with 20.2mA quiescent current. |
Pinout & Package
OPA842IDG4 is packaged in an SO-8 (D) surface-mount package with standard op amp pinout and no internal connections on pins 1, 4, and 5 (NC). Thermal resistance is 125°C/W (junction-to-ambient).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected; must be left floating or tied to ground per layout best practice. |
| 2 | Inverting Input (–) | Differential input node; requires matched impedance to noninverting input for bias current cancellation. |
| 3 | Noninverting Input (+) | Differential input node; dc path required (e.g., via 147Ω to ground in Figure 38) for optimal CMRR. |
| 4 | No Connection | Internally unconnected; no routing or soldering required. |
| 5 | No Connection | Internally unconnected; not used in SO-8 variant of OPA842ID. |
| 6 | Output | Capable of ±100mA sourcing/sinking; requires local 0.1µF bypass capacitor to each supply rail. |
| 7 | +VS | Positive supply pin; decouple with 0.1µF ceramic + 2.2µF tantalum per Figure 37. |
| 8 | –VS | Negative supply pin; symmetric decoupling required for optimal PSRR and distortion performance. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable architecture | Enables direct use in G=+1, G=–1, and low-gain differential amplifier topologies without external compensation. |
| Low 2.6nV/√Hz input voltage noise | Preserves dynamic range in front-end amplification of weak signals prior to 14-bit ADC conversion. |
| 0.01% settling in 22ns | Supports accurate sampling of fast edges in high-speed data acquisition and IF signal chains. |
| Professional video differential gain/phase | 0.003%/0.008° performance eliminates color fidelity loss in NTSC/PAL video distribution systems. |
| Stable into 100pF capacitive load | Allows direct driving of ADC input capacitance (e.g., ADS850) when combined with recommended RS series resistor. |
Applications
| ADC Buffering | Video Line Driving |
|---|---|
Use Scenario: AC-coupled interface between analog sensor output and 14-bit, 10MSPS ADS850 ADC with mid-scale reference shift. IC Role / Device Role / Timing Role: Precision buffer amplifier providing low-noise, low-distortion signal conditioning and drive capability for sampling switch transient currents. Use Value: Achieves >92dB SFDR at 5MHz, exceeding ADS850's 82dB rating and preserving full converter resolution without degradation. | Use Scenario: Driving 75Ω coaxial cable in professional broadcast equipment with NTSC composite video signal. IC Role / Device Role / Timing Role: High-fidelity voltage gain stage configured for G=+2 to compensate for 6dB cable attenuation. Use Value: Delivers 0.003%/0.008° differential gain/phase error, meeting SMPTE RP-168 broadcast compliance thresholds. |
| Low-Distortion IF Amplifier | Active Filter Configuration |
Use Scenario: Intermediate-frequency amplification in 5–50MHz spectrum analyzers and communications receivers. IC Role / Device Role / Timing Role: Low-phase-noise, high-linearity gain block operating at G=+2 or G=+5 with flat frequency response. Use Value: Maintains –90dBc third-harmonic distortion at 10MHz, enabling clean spectral analysis without spurious folding. | Use Scenario: Second-order Sallen-Key or MFB topology in anti-aliasing or reconstruction filters for data converters. IC Role / Device Role / Timing Role: Unity-gain stable active element implementing precise pole placement with minimal phase shift. Use Value: Supports filter Q-factor accuracy to ±0.5% over temperature due to 110dB open-loop gain and low input offset drift (±4µV/°C). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA843ID | Higher GBW (800MHz), lower input voltage noise (2.0nV/√Hz), but not unity-gain stable - requires minimum G=+5. | Suitable for higher-gain, wider-bandwidth IF amplifiers where unity-gain stability is not required. | Select OPA843ID only when gain ≥+5 is acceptable and improved noise performance justifies redesign. |
| OPA642U | Lower GBW (500MHz), higher input voltage noise (3.2nV/√Hz), unity-gain stable, but slower settling (35ns to 0.01%). | Better suited for general-purpose high-speed applications where 400MHz bandwidth is excessive. | Choose OPA642U when cost sensitivity outweighs need for sub-25ns settling or <0.01° phase error. |
Compared with OPA842IDG4, OPA843ID offers superior speed/noise but sacrifices unity-gain flexibility, while OPA642U trades bandwidth and settling for broader legacy compatibility and lower unit cost - making OPA842IDG4 the optimal balance for 14-bit ADC buffering and broadcast video.
Availability
OPA842IDG4 is available at Aetrix Electronics and suitable for professional audio interfaces, high-resolution imaging systems, and test instrumentation requiring stable component supply with guaranteed long-term manufacturability.
Supply support for OPA842IDG4 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 data converter interfaces.
The OPA842IDG4 belongs to TI's OPAx84x high-speed voltage-feedback op amp family, designed specifically for demanding signal chain applications including ADC/DAC buffering, video distribution, and precision test equipment where speed, linearity, and noise performance are critical.
FAQ
What is the maximum capacitive load the OPA842IDG4 can drive stably?
The OPA842IDG4 remains stable with up to 100pF capacitive load when used with an external series isolation resistor (RS) as specified in Figure 15 of the SBOS267D datasheet. For example, with RS = 50Ω, it drives 100pF without peaking; omitting RS risks instability. This capability directly supports reliable interfacing with ADC inputs like the ADS850, which present significant capacitive loading.
Does the OPA842IDG4 require external compensation for unity-gain operation?
No, the OPA842IDG4 is internally compensated for unity-gain stability and requires no external components to operate reliably at G=+1 or G=–1. Its voltage-feedback architecture and two-stage design ensure unconditional stability across all gains ≥1, simplifying layout and eliminating tuning effort in low-gain configurations such as transimpedance amplifiers or unity-gain buffers.
What is the recommended power supply decoupling for OPA842IDG4?
TI specifies 0.1µF ceramic capacitors placed as close as possible to both +VS (pin 7) and –VS (pin 8), plus bulk capacitance (e.g., 2.2µF tantalum) nearby. Figure 37 shows this configuration. Inadequate decoupling increases harmonic distortion and degrades PSRR - especially above 1MHz - so strict adherence to this dual-capacitor approach is essential for achieving the –93dBc distortion spec at 5MHz.
Can OPA842IDG4 be used in differential amplifier configurations?
Yes, the OPA842IDG4 is widely used in both single-op-amp and three-op-amp differential configurations. Its high CMRR (95dB) and matched input characteristics enable excellent common-mode rejection. Figure 39 shows a single-amplifier implementation; Figure 40 uses dual OPA2822s with OPA842IDG4 as the output stage - all validated in the SBOS267D datasheet for wideband differencing applications.
How does OPA842IDG4 perform in video applications with NTSC signals?
The OPA842IDG4 achieves 0.003% differential gain error and 0.008° differential phase error under NTSC conditions (G=+2, RL=150Ω), meeting or exceeding broadcast-grade requirements. This performance is measured and guaranteed in the datasheet, making it suitable for professional video line drivers, RGB distribution amplifiers, and composite video reconstruction circuits where color fidelity is critical.
OPA842IDG4 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:
- 400V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 20.2mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA842IDG4 FAQ
1.How can I place an order for OPA842IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA842IDG4 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 OPA842IDG4 reliable?
The price and inventory of OPA842IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA842IDG4 is usually 5 days.
3.What payment methods are accepted for OPA842IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA842IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA842IDG4?
OPA842IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA842IDG4 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 OPA842IDG4?
For technical support, including OPA842IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA842IDG4 requirements.
6.How does Aetrix verify that OPA842IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA842IDG4 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 OPA842IDG4 meets industry standards.
7.What is the process for return or replacement of OPA842IDG4?
All OPA842IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA842IDG4, 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 OPA842IDG4 part is unused and in its original packaging.
Return procedure for OPA842IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA842IDG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
