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Texas Instruments OPA4345EA/250
- Part No.:
- OPA4345EA/250
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4345EA/250.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,072
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Product details
Overview
OPA4345EA/250 from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for precision, low-power, single-supply operation at gains ≥5. It delivers 3MHz gain-bandwidth, 2V/µs slew rate, 150µA typical quiescent current per amplifier, and output swing within 1mV of rails into high-impedance loads - enabling high-dynamic-range signal conditioning in space-constrained data acquisition systems.
For engineers reviewing the OPA4345EA/250 datasheet, OPA4345EA/250 pinout, OPA4345EA/250 application, or OPA4345EA/250 equivalent, key selection criteria include its gain-stability requirement (G ≥ 5), TSSOP-14 package thermal resistance (100°C/W), rail-to-rail input common-mode range extending 300mV beyond supplies, and verified performance across –40°C to +85°C.
Technical Context
The OPA4345EA/250 employs a complementary differential input stage (N-channel + P-channel pairs) to achieve rail-to-rail input operation, with a 400mV transition region where both stages conduct - requiring biasing outside this zone for optimal CMRR and THD+N. Its class AB output stage uses common-source transistors to deliver true rail-to-rail output swing.
Designed for G ≥ 5 stability, it avoids unity-gain peaking via internal compensation tuned for higher closed-loop gains. The device operates from 2.7V to 5.5V single supply, supports input voltages down to –0.3V (below V–), and maintains 104dB open-loop gain (RL = 100kΩ) and 92dB CMRR over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - enables stable amplification up to ~600kHz at G = 5 without phase margin loss. |
| Slew Rate | 2V/µs - supports clean 1kHz, 2.5Vp-p output steps with ≤0.01% settling in 1.6µs. |
| Input Offset Voltage | ±0.2mV (typ) - ensures <1 LSB error when driving 12-bit ADCs with 5V full-scale range. |
| Quiescent Current | 150µA per amplifier (typ) - allows four-channel operation at <600µA total, ideal for battery-powered DAQ. |
| Output Swing | Within 1mV of rails (RL = 100kΩ) - maximizes usable dynamic range in 3.3V or 5V systems. |
| THD + Noise | 0.006% at 1kHz - preserves audio and sensor signal fidelity in active filters and microphone preamps. |
| Common-Mode Range | –0.3V to (V+) + 0.3V - accepts inputs below ground or above supply, simplifying level-shifting circuits. |
Pinout & Package
TSSOP-14 surface-mount package (JEDEC MO-153, 5.0mm × 4.4mm × 1.2mm), thermal resistance θJA = 100°C/W, RoHS-compliant, moisture sensitivity level (MSL) 1 (unlimited floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out D | Amplifier D output - drives external load or ADC input; rail-to-rail swing supports full-scale sampling. |
| 2 | –In D | Inverting input for Amp D - matched to +In D for precision differential gain configurations. |
| 3 | +In D | Non-inverting input for Amp D - accepts signals from –0.3V to V+ + 0.3V without clipping. |
| 4 | –V | Negative supply (ground in single-supply use) - must be bypassed with 0.01µF ceramic capacitor. |
| 5 | +In C | Non-inverting input for Amp C - electrically isolated from other channels; supports independent signal paths. |
| 6 | –In C | Inverting input for Amp C - shares no internal nodes with A/B/D sections; ensures channel separation >130dB at DC. |
| 7 | Out C | Amplifier C output - identical AC/DC specs to Out D; enables multi-channel simultaneous sampling. |
| 8 | Out A | Amplifier A output - first channel in quad layout; pin-compatible with SO-14 variant for design reuse. |
| 9 | –In A | Inverting input for Amp A - laser-trimmed matching to +In A minimizes offset drift vs temperature (±3µV/°C). |
| 10 | +In A | Non-inverting input for Amp A - common-mode rejection maintained at 76dB even at VCM = V+ – 1.8V. |
| 11 | +V | Positive supply (2.7V to 5.5V) - powers all four amplifiers; requires local 0.01µF bypass to ground. |
| 12 | +In B | Non-inverting input for Amp B - supports independent biasing; critical for inverting configurations with fixed VCM. |
| 13 | –In B | Inverting input for Amp B - matched input bias current (±0.2pA typ) enables high-Z sensor interfacing. |
| 14 | Out B | Amplifier B output - delivers same 2V/µs slew and 3MHz GBW as other channels; enables synchronized multi-channel buffering. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input & output | Enables full supply-voltage utilization in 3.3V systems, increasing effective ADC resolution by up to 1.5 bits. |
| G ≥ 5 optimized compensation | Eliminates need for external compensation in gain-of-5+ circuits, reducing BOM count and layout area. |
| 150µA per amplifier quiescent current | Supports always-on sensor monitoring with four channels drawing <600µA total at 3.3V. |
| 130dB channel separation (DC) | Prevents crosstalk between simultaneously sampled analog channels in multi-sensor DAQ systems. |
| 0.006% THD+N at 1kHz | Maintains signal integrity in audio front-ends and communication baseband filtering without post-processing. |
Applications
| PCMCIA Data Acquisition Card | Industrial Process Control Loop |
|---|---|
Use Scenario: Signal conditioning for 12-bit ADC inputs on compact PCMCIA cards with tight power budgets. IC Role / Device Role / Timing Role: Quad buffer and gain stage driving ADS7822 sampling ADC; provides charge injection immunity and rail-to-rail swing. Use Value: Enables 500µA total system quiescent current while maintaining 12-bit linearity - meeting PCMCIA Class A power limits. | Use Scenario: Isolated analog I/O module acquiring 4–20mA loop sensor outputs in factory automation PLCs. IC Role / Device Role / Timing Role: Four-channel I/V converter and anti-alias filter driver; each amp conditions one sensor channel. Use Value: 1mV output swing from rail preserves 16mV headroom for 4–20mA scaling, ensuring full 12-bit ADC utilization. |
| Audio Processing Front-End | Communications Baseband Filter |
Use Scenario: Electret microphone preamplifier and bandpass filter in VoIP handsets operating from 3.3V. IC Role / Device Role / Timing Role: First-stage gain (G = 100) and second-stage filtering; leverages rail-to-rail input to accept mic bias voltage. Use Value: 0.006% THD+N prevents harmonic distortion masking speech frequencies; 150µA/channel extends battery life. | Use Scenario: Low-pass and high-pass filtering of IF signals in GSM/GPRS modems before ADC sampling. IC Role / Device Role / Timing Role: Dual active filter section (one amp per pole); third/fourth amps provide gain and drive ADC input. Use Value: 3MHz GBW supports 200kHz filter cutoffs with <0.1dB passband ripple; TSSOP-14 fits dense RF module layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4344EA/250 | Unity-gain stable; 1MHz GBW; 0.8V/µs slew rate; identical pinout and package. | Better suited for G = 1 buffers and low-frequency (<100kHz) applications; lower power consumption at same gain. | Select OPA4344EA/250 when unity-gain stability or sub-100kHz bandwidth suffices; avoid for G ≥ 5 high-speed designs. |
| TLV2474IDR | 1.8MHz GBW; 0.6V/µs slew; 600µA IQ per amp; SO-14 package; not rail-to-rail input. | Higher power, lower speed, and limited input range (V– + 0.3V to V+ – 1.3V) restrict use in low-voltage, wide-dynamic-range systems. | Choose TLV2474IDR only if cost is primary constraint and rail-to-rail input is unnecessary; verify CMRR degradation near rails. |
Compared with OPA4344EA/250 and TLV2474IDR, the OPA4345EA/250 uniquely balances 3MHz bandwidth, 2V/µs slew, and rail-to-rail operation in a 14-pin TSSOP - making it the only option among the three qualified for precision, gain-of-5+ signal chains in 3.3V portable instrumentation.
Availability
OPA4345EA/250 is available at Aetrix Electronics and suitable for PCMCIA data acquisition cards, industrial process control modules, and audio front-end designs requiring stable component supply, RoHS compliance, and guaranteed long-term availability through TI's ACTIVE product status.
Supply support for OPA4345EA/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 innovation in precision op amps and signal chain solutions.
The OPA345 family - including OPA4345EA/250 - was designed specifically for low-power, single-supply, rail-to-rail signal conditioning in portable instrumentation, sensor interfaces, and communications infrastructure where gain ≥ 5 and 3MHz bandwidth are required.
FAQ
What is the minimum recommended gain for stable operation of the OPA4345EA/250?
The OPA4345EA/250 is internally compensated for stable operation at closed-loop gains of 5 or greater. Using it at G < 5 may cause peaking or oscillation due to reduced phase margin. For unity-gain or low-gain applications, the pin-compatible OPA4344EA/250 is specified and tested for stability down to G = 1. Always verify stability with actual load and PCB parasitics in final layout.
Does the OPA4345EA/250 support true rail-to-rail input when powered from a 3.3V supply?
Yes - the OPA4345EA/250 guarantees rail-to-rail input operation from –0.3V to V+ + 0.3V, so with a 3.3V supply, inputs from –0.3V to +3.6V are fully supported. This allows direct interfacing with sensors or DACs that output beyond the supply rails, provided input current is limited to ≤10mA using series resistors or Schottky clamps as specified in the TI datasheet.
What is the maximum capacitive load the OPA4345EA/250 can drive without external compensation?
When configured for G ≥ 5, the OPA4345EA/250 can directly drive up to 250pF of pure capacitive load while maintaining stability and <10% overshoot. At unity gain, it is not characterized for capacitive loading - use the OPA4344EA/250 instead, or add a 10Ω–20Ω series resistor at the output per TI Application Note SBOS107A Figure 5.
How does the OPA4345EA/250 handle input voltages below the negative supply rail?
The OPA4345EA/250 tolerates input voltages down to –0.3V relative to V– (ground in single-supply use). Inputs more negative than –0.3V risk output lock-up. TI recommends adding a Schottky diode clamp (e.g., IN5818) from input to V– with a 1kΩ series resistor - as shown in Figure 4 of SBOS107A - to protect against sub-rail excursions exceeding this limit.
Is the OPA4345EA/250 pin-compatible with other packages in the OPA4345 family?
Yes - the OPA4345EA/250 in TSSOP-14 (PW package) shares identical pinout with the OPA4345UA in SO-14 (D package), enabling drop-in replacement on existing SO-14 footprints with minor thermal and layout adjustments. Both are functionally and electrically identical; only package dimensions and θJA differ (100°C/W vs 100°C/W for SO-14).
OPA4345EA/250 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- CMOS
- Number of Circuits:
- 4
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2V/µs
- Gain Bandwidth Product:
- 3 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 150µA (x4 Channels)
- Current - Output / Channel:
- 15 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-TSSOP
OPA4345EA/250 FAQ
1.How can I place an order for OPA4345EA/250 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4345EA/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 OPA4345EA/250 reliable?
The price and inventory of OPA4345EA/250 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4345EA/250 is usually 5 days.
3.What payment methods are accepted for OPA4345EA/250?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4345EA/250 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4345EA/250?
OPA4345EA/250 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4345EA/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 OPA4345EA/250?
For technical support, including OPA4345EA/250 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4345EA/250 requirements.
6.How does Aetrix verify that OPA4345EA/250 is sourced from the original manufacturer or authorized distributors?
All OPA4345EA/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 OPA4345EA/250 meets industry standards.
7.What is the process for return or replacement of OPA4345EA/250?
All OPA4345EA/250 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4345EA/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 OPA4345EA/250 part is unused and in its original packaging.
Return procedure for OPA4345EA/250:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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