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Texas Instruments OPA3S328RGRT
- Part No.:
- OPA3S328RGRT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 20-VFQFN Exposed Pad
- Datasheet:
-
OPA3S328RGRT.pdf
- Description:
- IC CMOS 2 CIRCUIT 20VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:231
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Product details
Overview
OPA3S328RGRT from Texas Instruments is a dual-channel, 40-MHz precision CMOS operational amplifier with integrated analog switches, optimized for transimpedance applications in optical sensing and low-photocurrent signal chains. It delivers 60 µV max offset voltage, 0.2 pA input bias current, rail-to-rail I/O, and 30 V/µs slew rate - enabling high-accuracy current-to-voltage conversion across multiple decades of photocurrent (<1 nA) in space-constrained optical modules.
For engineers reviewing the OPA3S328RGRT datasheet, OPA3S328RGRT pinout, OPA3S328RGRT application, or OPA3S328RGRT equivalent, this device supports flexible gain selection via programmable switch matrices (A/B), zero-crossover input stage for full-supply common-mode range, and 100 GΩ shutdown output impedance for wired-OR channel multiplexing in test & measurement and optical network terminals.
Technical Context
The OPA3S328RGRT integrates two independent precision op amps with dedicated 3×1 analog switch matrices per channel (A and B), each controlled by two select pins (SELA0/SELA1, SELB0/SELB1). Switches feature 84 Ω typical on-resistance, <6 pC charge injection, and 350 MHz −3-dB bandwidth - supporting high-fidelity signal routing without external multiplexers.
Its zero-crossover input architecture eliminates crossover distortion across the full supply range (–0.1 V to V+ + 0.1 V), while rail-to-rail output swing (5 mV from rails at 2.2 V supply) ensures maximum dynamic range. Power-down mode reduces quiescent current to 30 µA total and raises output impedance to 100 GΩ, enabling low-leakage channel isolation in portable DAQ systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 40 MHz gain-bandwidth product - enables stable closed-loop operation up to 10 MHz at G = +4, suitable for high-speed photodiode front-ends. |
| Input bias current | 0.2 pA max - minimizes error in femtoampere-level photocurrent measurement, critical for low-light optical receivers. |
| Offset voltage | ±60 µV max - ensures sub-10 ppm accuracy in precision transimpedance gains up to 10⁹ V/A. |
| Slew rate | ±30 V/µs - supports fast settling (0.42 µs to 0.01%) for pulsed optical signals in digital multimeters and ONT burst-mode detection. |
| Supply range | 2.2 V to 5.5 V single supply - compatible with Li-ion battery-powered handheld instruments and 3.3-V optical module rails. |
| Switch on-resistance | 84 Ω typ - maintains gain accuracy and bandwidth integrity when routing feedback paths in programmable-gain TIA configurations. |
| Shutdown current | 30 µA total - extends battery life in portable test equipment by disabling unused amplifier/switch channels. |
Pinout & Package
OPA3S328RGRT is packaged in a 20-pin, 3.5-mm × 3.5-mm VQFN (RGR) with exposed thermal pad connected to V–. Pin functions are validated per TI SBOS937D Rev D (Dec 2023).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive power supply | Highest potential rail (2.2–5.5 V); powers both amplifiers and switch logic. |
| V– | Negative power supply / ground reference | Lowest potential rail; thermal pad must be soldered to PCB ground plane for thermal and noise performance. |
| GND | Digital ground | Reference for SELx control inputs; tied internally to V– but kept separate for layout noise isolation. |
| +INA, –INA | Amplifier A differential inputs | Zero-crossover inputs support rail-to-rail common-mode range; ±0.1 V beyond rails allowed. |
| +INB, –INB | Amplifier B differential inputs | Independent of Channel A; identical electrical specs and input stage architecture. |
| OUTA, OUTB | Amplifier outputs | Rail-to-rail capable; 5 mV headroom at 2.2 V supply enables >99% dynamic range utilization. |
| INSA, INSB | Switch matrix inputs | Shared input nodes for A/B switch banks; connect to photodiode cathodes or feedback networks. |
| OUTSA1–2, OUTSB1–3 | Switch matrix outputs | Three configurable outputs per channel; OUTSA3 only available in DSBGA package, not RGR. |
| SELA0/1, SELB0/1 | Switch select controls | Binary-coded inputs defining closed/open state of each switch; HIGH/HIGH enables special power-down mode. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 3×1 switch matrix per channel | Eliminates external analog MUX, reducing board area and parasitic capacitance in multi-gain TIA designs. |
| Zero-crossover input stage | Enables true rail-to-rail input common-mode range without offset discontinuity - essential for unipolar sensor interfaces. |
| 100 GΩ shutdown output impedance | Allows wired-OR connection of multiple OPA3S328RGRT outputs without loading, simplifying channel selection in optical line cards. |
| 0.2 pA input bias current | Supports transimpedance gains ≥10⁹ V/A with <100 µV error from input current, critical for picoampere photodiode signals. |
| 350 MHz switch −3-dB bandwidth | Maintains signal fidelity through switch paths up to 100 MHz, preserving rise time in high-speed optical pulse detection. |
Applications
| Optical Transport Inter-Dc Interconnect | Optical Network Terminal (ONT) |
|---|---|
Use Scenario: High-speed, low-noise current-to-voltage conversion for 100G/400G coherent receiver front-ends in data center interconnect links. IC Role / Device Role / Timing Role: Dual-channel transimpedance amplifier with programmable gain switching for adaptive signal conditioning of differential photodiode outputs. Use Value: 40 MHz GBW and 6.1 nV/√Hz input voltage noise enable >60 dB SNR at 10 GHz equivalent bandwidth, meeting IEEE 802.3bs jitter requirements. | Use Scenario: Burst-mode upstream signal reception in GPON/XGS-PON ONTs where dynamic range spans 30 dB across varying fiber lengths. IC Role / Device Role / Timing Role: Precision TIA with selectable feedback paths to accommodate variable photodiode responsivity and link loss budgets. Use Value: ±60 µV offset and 0.2 pA bias current ensure accurate burst amplitude measurement down to –30 dBm, improving upstream BER stability. |
| Digital Multimeter (DMM) | Small Cell Base Station |
Use Scenario: Picoampere-range current measurement in 6½-digit bench DMMs requiring ultra-low leakage and high linearity. IC Role / Device Role / Timing Role: Low-input-bias-current amplifier with integrated switches for auto-ranging feedback resistor selection in nanoampere current measurement ranges. Use Value: 10 pA switch leakage and 1 || 4 TΩ || pF input impedance minimize measurement error below 100 pA, achieving true 100 fA resolution. | Use Scenario: Optical fronthaul monitoring in 5G small cells using embedded SFP+ modules with real-time laser bias control. IC Role / Device Role / Timing Role: Dual TIA for simultaneous monitoring of transmit and receive optical power with independent gain calibration. Use Value: Independent shutdown per channel (30 µA total) enables duty-cycled monitoring, extending module lifetime in thermally constrained outdoor enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA23S328RGRT | Same die, dual-channel variant - identical specs and pinout; OPA3S328RGRT is the correct orderable part number for this configuration. | No functional difference; OPA23S328RGRT is a deprecated or non-existent designation - OPA3S328RGRT is the valid TI part. | Select OPA3S328RGRT as the only production-qualified version; verify ordering code against TI's official documentation. |
| LTC6268IMS8E#PBF | Single-channel, 500 MHz GBW, 3 fA bias current, no integrated switches; requires external MUX for gain selection. | Higher bandwidth and lower bias current, but lacks switch integration - increases component count and layout complexity in multi-gain systems. | Choose LTC6268IMS8E#PBF only when >100 MHz bandwidth is required and switch integration is unnecessary; otherwise OPA3S328RGRT offers superior system integration. |
Compared with LTC6268IMS8E#PBF, OPA3S328RGRT trades 10× lower bandwidth for integrated switching, 30× higher input bias current tolerance, and 2× lower quiescent current per channel - making it optimal for compact, battery-aware, multi-decade optical receivers rather than ultra-wideband RF sampling.
Availability
OPA3S328RGRT is available at Aetrix Electronics and suitable for optical transport interconnect, optical network terminal (ONT), and digital multimeter (DMM) applications requiring stable component supply, long-term manufacturability, and TI-qualified automotive-grade reliability.
Supply support for OPA3S328RGRT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPA3S328RGRT belongs to TI's precision op amp portfolio designed specifically for high-fidelity optical and sensor signal conditioning - emphasizing ultra-low input bias current, integrated switching, and rail-to-rail operation in miniature packages.
FAQ
What is the maximum operating temperature for the OPA3S328RGRT?
The OPA3S328RGRT is specified for operation from –40°C to +125°C ambient temperature. Its thermal resistance (RθJA) is 43.7°C/W in the RGR VQFN package, enabling reliable performance in industrial and optical module environments with adequate PCB copper pour and thermal vias under the exposed pad.
Does the OPA3S328RGRT support true rail-to-rail input and output?
Yes, the OPA3S328RGRT features a zero-crossover input stage that allows the input common-mode voltage to span from (V–) – 0.1 V to (V+) + 0.1 V, and its output swings within 5 mV of both rails at 2.2 V supply. This enables full utilization of ADC input range in single-supply optical front-ends without level-shifting circuitry.
How many switch outputs does the OPA3S328RGRT provide per channel in the RGR package?
The OPA3S328RGRT in the RGR (20-pin VQFN) package provides two switch outputs per channel: OUTSA1 and OUTSA2 for Amplifier A, and OUTSB1 and OUTSB2 for Amplifier B. OUTSA3 is exclusive to the YBJ (DSBGA-24) package and is not present on the OPA3S328RGRT.
What is the typical on-resistance of the integrated switches in the OPA3S328RGRT?
The typical on-resistance of the integrated switches in the OPA3S328RGRT is 84 Ω at V+ = 5 V and input voltage = 2.5 V. This value remains stable across temperature (±10 Ω from –40°C to +125°C), ensuring consistent transimpedance gain accuracy in varying environmental conditions.
Can the OPA3S328RGRT be used in battery-powered handheld instruments?
Yes, the OPA3S328RGRT supports battery-powered operation with a 2.2-V minimum supply and consumes only 3.8 mA per channel (7.6 mA total) in active mode. Its 30 µA total shutdown current and 100 GΩ output impedance in power-down mode make it ideal for portable DMMs and field-test optical receivers requiring extended runtime and channel isolation.
OPA3S328RGRT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- CMOS
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 30V/µs
- Gain Bandwidth Product:
- 40 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 3.8mA (x2 Channels)
- Current - Output / Channel:
- 63 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-VQFN (3.5x3.5)
OPA3S328RGRT FAQ
1.How can I place an order for OPA3S328RGRT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3S328RGRT 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 OPA3S328RGRT reliable?
The price and inventory of OPA3S328RGRT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3S328RGRT is usually 5 days.
3.What payment methods are accepted for OPA3S328RGRT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3S328RGRT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3S328RGRT?
OPA3S328RGRT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3S328RGRT 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 OPA3S328RGRT?
For technical support, including OPA3S328RGRT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3S328RGRT requirements.
6.How does Aetrix verify that OPA3S328RGRT is sourced from the original manufacturer or authorized distributors?
All OPA3S328RGRT 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 OPA3S328RGRT meets industry standards.
7.What is the process for return or replacement of OPA3S328RGRT?
All OPA3S328RGRT units undergo pre-shipment inspection (PSI). If there is an issue with OPA3S328RGRT, 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 OPA3S328RGRT part is unused and in its original packaging.
Return procedure for OPA3S328RGRT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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