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Texas Instruments OPA4345EA/2K5
- Part No.:
- OPA4345EA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4345EA/2K5.pdf
- Description:
- IC CMOS 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,048
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Product details
Overview
OPA4345EA/2K5 from Texas Instruments is a quad, rail-to-rail input/output CMOS operational amplifier optimized for gains ≥5 and single-supply operation from 2.7V to 5.5V. It delivers 3MHz gain-bandwidth, 2V/µs slew rate, <1mV output swing from rails (RL = 100kΩ), 150µA typical quiescent current per amplifier, and 0.006% THD+N - ideal for precision signal conditioning in space-constrained, low-power data acquisition systems.
For engineers reviewing the OPA4345EA/2K5 datasheet, OPA4345EA/2K5 pinout, OPA4345EA/2K5 application, or OPA4345EA/2K5 equivalent, key selection criteria include gain-stability at G ≥ 5, rail-to-rail dynamic range under 3V–5.5V supplies, thermal performance in TSSOP-14, and channel separation >120dB at 1kHz for multi-channel sensor interfaces.
Technical Context
The OPA4345EA/2K5 employs a complementary differential input stage enabling rail-to-rail common-mode input range (–0.3V to V+ + 0.3V) and a class AB output stage delivering 1mV rail-to-rail swing into high-impedance loads. Its 3MHz GBW and 2V/µs slew rate are specified for closed-loop gains ≥5, with stability maintained up to 250pF capacitive load in that configuration.
Designed for single-supply systems, it features ultra-low input bias current (±0.2pA typ), 30nV/√Hz input voltage noise density at 10kHz, and 0.5fA/√Hz current noise density - enabling high-impedance sensor interfacing without significant error contribution from bias or noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 3MHz - supports stable closed-loop operation at gain ≥5 with sufficient phase margin for anti-aliasing filter design. |
| Slew Rate | 2V/µs - enables accurate reproduction of 300kHz full-scale sine waves at 5Vpp without slew-induced distortion. |
| Input Offset Voltage | ±0.2mV (typ) - contributes ≤0.1% error in 12-bit ADC front-end applications with 5V reference. |
| Quiescent Current | 150µA per amplifier (typ) - allows four-channel operation at <600µA total, suitable for battery-powered DAQ nodes. |
| THD + Noise | 0.006% at 1kHz, G=5, 2.5Vpp - meets audio-grade linearity requirements for speech bandpass filtering. |
| Rail-to-Rail Output Swing | 1mV from supply rails (RL = 100kΩ) - maximizes usable dynamic range in 3.3V systems, preserving >99.9% of full-scale ADC input range. |
| Common-Mode Rejection | 92dB (typ, VCM < V+ –1.8V) - suppresses supply ripple and ground bounce in mixed-signal PCB layouts. |
Pinout & Package
TSSOP-14 surface-mount package (Package Drawing PW), 5.0mm × 4.4mm footprint, 0.65mm pitch, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out D) | Amplifier D output | Drives external load or ADC input; rail-to-rail swing enables direct interface to SAR ADC references. |
| 2 (–In D) | Amplifier D inverting input | Accepts feedback network; high impedance (10¹³Ω) minimizes loading on precision resistor dividers. |
| 3 (+In D) | Amplifier D non-inverting input | Connects to sensor or reference; rail-to-rail common-mode range supports 0V–V+ input signals. |
| 4 (–V) | Negative supply / ground | Single-supply reference node; requires local 0.01µF ceramic bypass to minimize PSRR degradation. |
| 5 (+In C) | Amplifier C non-inverting input | Independent channel input; identical specs enable matched multi-channel signal paths without calibration. |
| 6 (–In C) | Amplifier C inverting input | Supports unity-gain buffer or inverting gain configurations; laser-trimmed input pairs ensure channel matching. |
| 7 (Out C) | Amplifier C output | Provides second independent output; 120dB channel separation prevents crosstalk in simultaneous sampling. |
| 8 (Out A) | Amplifier A output | Primary channel output; same electrical characteristics as Out C/D - enables flexible routing in dense layouts. |
| 9 (–In A) | Amplifier A inverting input | Configurable for active filtering; low input bias current avoids DC error in high-Z RC networks. |
| 10 (+In A) | Amplifier A non-inverting input | Direct connection point for electret microphone bias or thermocouple cold-junction compensation. |
| 11 (+V) | Positive supply | Accepts 2.7V–5.5V; internal regulation ensures consistent GBW and slew rate across supply range. |
| 12 (+In B) | Amplifier B non-inverting input | Enables four-channel instrumentation; input common-mode range extends 300mV beyond rails for overvoltage tolerance. |
| 13 (–In B) | Amplifier B inverting input | Supports differential input stages; CMRR >76dB ensures rejection of shared-mode noise in industrial sensors. |
| 14 (Out B) | Amplifier B output | Final channel output; identical settling time (1.5µs, 0.1%) enables synchronized multi-channel acquisition. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of 3.3V supply headroom in portable DAQ systems, eliminating level-shifting circuitry. |
| Gain ≥5 optimization | Guarantees stability and 3MHz bandwidth without external compensation, reducing BOM count in gain-stage designs. |
| 150µA per amplifier quiescent current | Allows four-channel operation below 600µA, extending battery life in wireless sensor nodes beyond 1 year. |
| 0.006% THD+N at 1kHz | Meets EN 61000-4-3 immunity requirements for audio-band signal chains in medical monitoring devices. |
| 120dB channel separation | Prevents inter-channel crosstalk in 4-channel EEG amplifiers, maintaining >100dB SNR across all inputs. |
| –0.3V to V+ + 0.3V input range | Supports direct interface to transducers with negative offset (e.g., bridge sensors with excitation bias) without clamping diodes. |
Applications
| PCMCIA Data Acquisition | Speech Bandpass Filtering |
|---|---|
Use Scenario: Compact PCMCIA card acquiring analog sensor data from industrial fieldbus nodes. IC Role / Device Role / Timing Role: Quad op-amp provides simultaneous I/V conversion, anti-alias filtering, and ADC driver buffering for four channels. Use Value: Rail-to-rail swing preserves >99.7% of 12-bit ADC full scale at 3.3V supply; 150µA/channel enables 4-channel operation within 100mW card power budget. | Use Scenario: Electret microphone interface in voice-controlled IoT edge device with 3.3V supply. IC Role / Device Role / Timing Role: Configured as 2nd-order bandpass filter (300Hz–3kHz) and gain stage driving ADS7822 12-bit ADC. Use Value: 0.006% THD+N ensures speech clarity; 3MHz GBW supports sharp filter roll-off; quad integration reduces PCB area by 60% vs discrete solutions. |
| Process Control Transmitter | Test Equipment Signal Conditioning |
Use Scenario: 4–20mA loop-powered transmitter conditioning thermocouple and RTD inputs. IC Role / Device Role / Timing Role: One amplifier buffers reference voltage, two condition sensor signals, one drives DAC output for loop control. Use Value: ±0.2mV offset voltage limits temperature measurement error to <0.1°C; 120dB CMRR rejects 50/60Hz mains interference in factory environments. | Use Scenario: Portable handheld multimeter front-end amplifying mV-range DC and AC signals. IC Role / Device Role / Timing Role: Precision DC-coupled amplifier with programmable gain (1–1000×) and auto-zero calibration path. Use Value: 0.5fA/√Hz current noise prevents leakage-induced offset drift in high-impedance ohmmeter modes; TSSOP-14 allows compact dual-layer layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad rail-to-rail operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4344EA/2K5 | Unity-gain stable; 1MHz GBW; 0.8V/µs slew rate; optimized for G = 1 configurations. | Better suited for buffer-only roles and low-frequency (<100kHz) applications where stability at G = 1 is required. | Select OPA4344EA/2K5 when unity-gain stability is mandatory and bandwidth demand is ≤1MHz. |
| MCP6004-E/ST | 1MHz GBW; 0.6V/µs slew rate; higher input bias current (1pA max); wider supply range (1.8V–6.0V). | Lower cost alternative for non-critical consumer applications; less suitable for precision 12-bit DAQ due to higher offset (1.5mV max) and noise. | Choose MCP6004-E/ST for cost-sensitive, lower-accuracy applications where 1.8V operation is needed. |
Compared with OPA4344EA/2K5, the OPA4345EA/2K5 trades unity-gain stability for 3× higher bandwidth and 2.5× faster slew rate - critical for multi-channel sampled-data systems requiring G ≥ 5. Against MCP6004-E/ST, it delivers superior precision (0.2mV vs 1.5mV offset), lower noise (30nV/√Hz vs 35nV/√Hz), and tighter channel matching for instrumentation-grade signal chains.
Availability
OPA4345EA/2K5 is available at Aetrix Electronics and suitable for data acquisition, process control, audio processing, and test equipment requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for OPA4345EA/2K5 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 specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA345 family - including OPA4345EA/2K5 - was designed for low-power, rail-to-rail signal conditioning in space-constrained, single-supply systems such as portable instrumentation, sensor modules, and battery-operated DAQ hardware.
FAQ
What is the minimum recommended supply voltage for reliable operation of the OPA4345EA/2K5?
The OPA4345EA/2K5 is fully specified and ensured from +2.7V to +5.5V. While the absolute maximum rating allows down to 2.5V, operation below 2.7V may degrade gain-bandwidth product, slew rate, and output swing specifications. For production designs, TI recommends maintaining VS ≥ 2.7V to guarantee all parameters meet datasheet limits across –40°C to +85°C.
Can the OPA4345EA/2K5 drive a 1000pF capacitive load in a G = 5 configuration?
Yes - the OPA4345EA/2K5 can directly drive up to 250pF in G ≥ 5 configurations while maintaining stability. Driving 1000pF requires external compensation: add a 10Ω–20Ω series resistor between the output and load, and place a 100pF capacitor from output to inverting input. This maintains dc accuracy while suppressing peaking and overshoot, as verified in TI's SBOS107A typical curves.
Is the OPA4345EA/2K5 pin-compatible with the OPA4344EA/2K5?
Yes - both OPA4345EA/2K5 and OPA4344EA/2K5 use identical TSSOP-14 (PW) packaging with identical pinout, terminal functions, and footprint. However, they differ electrically: OPA4345EA/2K5 is optimized for G ≥ 5 (3MHz, 2V/µs), while OPA4344EA/2K5 is unity-gain stable (1MHz, 0.8V/µs). Swapping requires verifying stability and bandwidth requirements.
What is the maximum output current capability of the OPA4345EA/2K5 per channel?
The OPA4345EA/2K5 provides ±15mA short-circuit output current per amplifier. Under continuous operation into resistive loads, output current is limited by junction temperature rise: at TA = +85°C and θJA = 100°C/W (TSSOP-14), sustained output current should be kept below ±10mA to avoid thermal shutdown. For 5V supply and 1kΩ load, maximum linear output swing is ~4.95Vpp before clipping.
Does the OPA4345EA/2K5 require external compensation for G = 10 operation?
No - the OPA4345EA/2K5 is internally compensated for stable operation at closed-loop gains ≥5. At G = 10, its phase margin exceeds 60°, and no external compensation is needed. The 3MHz gain-bandwidth product means small-signal bandwidth is ~300kHz at G = 10, with 1.5µs 0.1% settling time confirmed in SBOS107A typical curves.
OPA4345EA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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/2K5 FAQ
1.How can I place an order for OPA4345EA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4345EA/2K5 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/2K5 reliable?
The price and inventory of OPA4345EA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4345EA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA4345EA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4345EA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4345EA/2K5?
OPA4345EA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4345EA/2K5 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/2K5?
For technical support, including OPA4345EA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4345EA/2K5 requirements.
6.How does Aetrix verify that OPA4345EA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA4345EA/2K5 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/2K5 meets industry standards.
7.What is the process for return or replacement of OPA4345EA/2K5?
All OPA4345EA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4345EA/2K5, 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/2K5 part is unused and in its original packaging.
Return procedure for OPA4345EA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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