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Texas Instruments OPA4137UAG4
- Part No.:
- OPA4137UAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4137UAG4.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,448
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Product details
Overview
OPA4137UAG4 from Texas Instruments is a quad FET-input operational amplifier designed for low-cost, low-power precision signal conditioning in battery-powered and space-constrained systems. It delivers ±10 pA input bias current, ±0.3 mV max input offset voltage (at +25°C), 1.1 MHz gain-bandwidth product, 4.5 V/µs slew rate, and operates from ±2.25 V to ±18 V supplies - enabling high-accuracy strain gage and photodetector amplification with rail-to-rail input common-mode range extending to the positive supply.
For engineers reviewing the OPA4137UAG4 datasheet, OPA4137UAG4 pinout, OPA4137UAG4 application, or OPA4137UAG4 equivalent, key selection criteria include ultra-low input bias current for high-impedance sensor interfaces, guaranteed 145 dB open-loop gain for stable integrator performance, low 120 µA/channel quiescent current for multi-channel portable instrumentation, and SOIC-14 packaging compatible with standard automated assembly.
Technical Context
The OPA4137UAG4 integrates four fully independent FET-input amplifier channels in a single SOIC-14 package, eliminating crosstalk and interaction between channels. Its input stage features JFET-based differential pairs with diode clamping for ESD protection, supporting input voltages beyond the rails without phase reversal - critical for high-side current sensing and single-supply photodiode amplifiers.
It uses a unity-gain-stable internal compensation scheme optimized for 1.1 MHz bandwidth and 4.5 V/µs slew rate across the full ±2.25 V to ±18 V supply range. The device maintains specified performance from –40°C to +85°C ambient, with open-loop gain of 94 dB (min) and CMRR of 74 dB (min) over temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input bias current | ±10 pA at 25°C - enables use with >100 MΩ source impedances (e.g., piezoresistive sensors, photodiodes) without significant error. |
| Input offset voltage | ±0.3 mV (max, +25°C); ±7 mV (max, –40°C to +85°C) - supports 12-bit accuracy in DC-coupled amplifiers with gain ≤100. |
| Gain-bandwidth product | 1.1 MHz - allows stable closed-loop operation up to G = 100 at ~11 kHz, suitable for active filters and anti-aliasing stages. |
| Slew rate | 4.5 V/µs - ensures <5 µs settling to 0.01% for 10 V step, meeting timing requirements in precision data acquisition front-ends. |
| Quiescent current | 120 µA per channel - enables four-channel analog signal conditioning in battery-powered instruments with <500 µA total IQ. |
| Common-mode input range | (V–) + 3 V to (V+) - includes positive rail, permitting direct high-side current sensing and single-supply operation with inputs referenced to V+. |
| Open-loop gain | 94 dB (min) - guarantees <0.01% gain error at G = 100, essential for precision integrators and reference buffers. |
Pinout & Package
OPA4137UAG4 is housed in a 14-pin SOIC (SO-14) surface-mount package measuring 3.91 mm × 8.65 mm, RoHS-compliant, with standard JEDEC MS-012AC footprint and moisture sensitivity level (MSL) 3 (260°C peak reflow, 168-hour floor life).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT A | Amplifier A output - drives loads up to 330 pF; output swing limited to (V–)+1.2 V to (V+)–1.1 V. |
| 2 | IN– A | Inverting input for Amplifier A - high-impedance FET node; requires external bias network for single-supply use. |
| 3 | IN+ A | Non-inverting input for Amplifier A - accepts signals up to (V–)+3 V to (V+), including V+. |
| 4 | V– | Negative supply rail - shared by all four amplifiers; must be decoupled with ≥10 nF ceramic capacitor. |
| 5 | IN+ B | Non-inverting input for Amplifier B - electrically isolated from other channels; identical specs to Pin 3. |
| 6 | IN– B | Inverting input for Amplifier B - independent bias path; no crosstalk with Amplifier A or C. |
| 7 | OUT B | Amplifier B output - fully buffered; short-circuit current ±25/+60 mA. |
| 8 | OUT C | Amplifier C output - matches OUT A/B electrical behavior; supports simultaneous multi-channel signal processing. |
| 9 | IN– C | Inverting input for Amplifier C - same FET input structure and leakage as Pins 2 and 6. |
| 10 | IN+ C | Non-inverting input for Amplifier C - rail-to-rail common-mode capability confirmed per datasheet Figure 4-4. |
| 11 | V+ | Positive supply rail - shared by all amplifiers; bypassing required for stability at high frequencies. |
| 12 | IN+ D | Non-inverting input for Amplifier D - identical input stage design; validated for photodetector biasing. |
| 13 | IN– D | Inverting input for Amplifier D - supports transimpedance configurations with feedback resistors >100 MΩ. |
| 14 | OUT D | Amplifier D output - fully specified for capacitive load drive up to 330 pF per channel. |
Key Features
| Feature | Design Value |
|---|---|
| No phase reversal on input overvoltage | Input terminals tolerate voltages beyond V–/V+ without output polarity inversion - prevents latch-up in voltage-follower control loops. |
| Fully independent quad architecture | Zero crosstalk between channels; overload or short-circuit on one amplifier does not affect others' DC or AC performance. |
| Rail-to-rail input common-mode range | Accepts inputs up to V+, enabling high-side current sensing and single-supply operation without level-shifting circuitry. |
| Low-noise precision performance | 6 µVP-P (0.1–10 Hz) and 30 nV/√Hz (1 kHz) input voltage noise - preserves SNR in low-level sensor signal chains. |
| High open-loop gain | 94 dB minimum - ensures <0.002% gain error at G = 10, critical for precision integrators and reference buffers. |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Wheatstone bridge output from metal foil or semiconductor strain gages in load cells and structural monitoring. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end with high-Z differential input, configured as two-stage difference amplifier using two OPA4137UAG4 channels. Use Value: ±10 pA input bias current minimizes offset drift from bridge resistor imbalance; 145 dB open-loop gain ensures stable 1000× gain with <0.01% linearity error. | Use Scenario: Transimpedance conversion of nanoamp-level photocurrent from PIN photodiodes in optical encoders and spectrometers. IC Role / Device Role / Timing Role: Low-noise transimpedance amplifier (TIA) with feedback resistor >100 MΩ, using one OPA4137UAG4 channel per detector. Use Value: 30 nV/√Hz input voltage noise and 6 µVP-P 0.1–10 Hz noise preserve dynamic range; rail-to-rail input accommodates photodiode cathode bias at V+. |
| Precision Integrator | Battery-Powered Instrumentation |
Use Scenario: Analog integration of current signals in charge amplifiers for piezoelectric sensors and energy metering ICs. IC Role / Device Role / Timing Role: Unity-gain stable integrator core using one OPA4137UAG4 channel with precision capacitor and low-leakage feedback path. Use Value: 1.1 MHz GBW and 4.5 V/µs slew rate support 10 kHz integration bandwidth; ±0.3 mV offset enables <1 µV/s drift in 1-second integration windows. | Use Scenario: Multi-channel signal conditioning in handheld multimeters, portable gas analyzers, and field-deployable data loggers. IC Role / Device Role / Timing Role: Quad-channel analog front-end providing simultaneous amplification, filtering, and level-shifting for sensor inputs. Use Value: 120 µA/channel quiescent current limits total analog subsystem draw to <500 µA; SOIC-14 footprint fits compact PCB layouts with minimal thermal mass. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL074CDR | Higher input bias current (±30 pA), higher offset voltage (±6 mV), lower GBW (3 MHz), no rail-to-rail input | Less suitable for high-impedance photodiode or strain gage interfaces; acceptable for general-purpose AC-coupled filtering | Choose TL074CDR only when cost is primary constraint and input impedance <10 MΩ is acceptable. |
| OPA4140AIPW | Lower input bias current (±0.3 pA), lower offset (±125 µV), higher precision, but 2× quiescent current (240 µA/channel) | Better for ultra-high-precision lab equipment; less optimal for battery life-sensitive portable designs | Select OPA4140AIPW when sub-µV offset drift and femtoamp bias are mandatory; accept higher power and cost. |
Compared with TL074CDR and OPA4140AIPW, the OPA4137UAG4 uniquely balances ultra-low input bias current (±10 pA), low quiescent power (120 µA/channel), rail-to-rail input capability, and SOIC-14 manufacturability - making it the optimal choice for cost-sensitive, battery-operated precision sensor interfaces requiring four independent channels.
Availability
OPA4137UAG4 is available at Aetrix Electronics and suitable for strain gage amplification, photodetector signal conditioning, and precision integrator circuits requiring stable component supply across industrial, test & measurement, and portable instrumentation programs.
Supply support for OPA4137UAG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision amplifiers and signal chain components.
The OPA4137UAG4 belongs to TI's MicroAmplifier™ series - engineered specifically for low-cost, low-power, high-impedance sensor interface applications where FET-input performance, small size, and production scalability are essential.
FAQ
What is the maximum operating supply voltage for OPA4137UAG4?
The OPA4137UAG4 supports dual supplies from ±2.25 V to ±18 V, or single supply from +4.5 V to +36 V. Absolute maximum rating is 36 V across V+ and V– pins. Operation beyond ±18 V or +36 V risks permanent damage per Section 5.1 Absolute Maximum Ratings in the TI SBOS089A datasheet. Always verify layout decoupling and thermal derating for sustained operation near limits.
Does OPA4137UAG4 support rail-to-rail input operation?
Yes, the OPA4137UAG4 input common-mode voltage range extends from (V–) + 3 V to (V+), explicitly including the positive supply rail. This enables true high-side sensing - for example, connecting a photodiode anode to V+ while using the OPA4137UAG4 in transimpedance mode. Input phase reversal is avoided even when signals exceed the supply rails, as confirmed in Section 6.1.2 of the datasheet.
What is the typical input bias current of OPA4137UAG4 at room temperature?
The typical input bias current of OPA4137UAG4 is ±10 pA at +25°C, with a maximum of ±20 pA over the full –40°C to +85°C temperature range. This value is measured with VCM = 0 V and is consistent across all four channels. It is verified in Section 5.4 Electrical Characteristics (IB parameter) and Figure 5-30 of the SBOS089A datasheet.
Can OPA4137UAG4 drive capacitive loads, and what is the limit?
Yes, the OPA4137UAG4 is characterized to drive capacitive loads up to 330 pF while maintaining stability and specified settling time. This value is explicitly listed in Section 5.4 under "CLOAD" and applies per channel. For loads >330 pF, external isolation resistance or feedback compensation is required to prevent peaking or oscillation, as noted in Application Note SBOA087.
Is OPA4137UAG4 pin-compatible with other quad op amps like LM324 or TL074?
No, OPA4137UAG4 is not pin-compatible with LM324 or TL074. While all three use SOIC-14 packages, their pinouts differ: OPA4137UAG4 places V– at Pin 4 and V+ at Pin 11, whereas LM324 uses Pin 4 for V+ and Pin 11 for V–, and TL074 uses Pin 4 for V– and Pin 8 for V+. Swapping these devices without PCB revision will cause functional failure or damage.
OPA4137UAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- J-FET
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 3.5V/µs
- Gain Bandwidth Product:
- 1 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 5 pA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 220µA
- Current - Output / Channel:
- 60 mA
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4137UAG4 FAQ
1.How can I place an order for OPA4137UAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4137UAG4 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 OPA4137UAG4 reliable?
The price and inventory of OPA4137UAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4137UAG4 is usually 5 days.
3.What payment methods are accepted for OPA4137UAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4137UAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4137UAG4?
OPA4137UAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4137UAG4 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 OPA4137UAG4?
For technical support, including OPA4137UAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4137UAG4 requirements.
6.How does Aetrix verify that OPA4137UAG4 is sourced from the original manufacturer or authorized distributors?
All OPA4137UAG4 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 OPA4137UAG4 meets industry standards.
7.What is the process for return or replacement of OPA4137UAG4?
All OPA4137UAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4137UAG4, 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 OPA4137UAG4 part is unused and in its original packaging.
Return procedure for OPA4137UAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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