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Texas Instruments OPA4137UA/2K5E4
- Part No.:
- OPA4137UA/2K5E4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4137UA/2K5E4.pdf
- Description:
- IC OPAMP JFET 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,401
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Product details
Overview
OPA4137UA/2K5E4 from Texas Instruments is a quad FET-input operational amplifier in SO-14 package, delivering 1MHz gain-bandwidth, 3.5V/µs slew rate, ±2.25V to ±18V dual-supply operation, and 5pA input bias current. It serves precision signal conditioning in battery-powered instrumentation and photodetector front-ends where low power and rail-to-rail input capability are critical.
For engineers reviewing the OPA4137UA/2K5E4 datasheet, OPA4137UA/2K5E4 pinout, OPA4137UA/2K5E4 application, or OPA4137UA/2K5E4 equivalent, key selection criteria include guaranteed 74dB CMRR over –40°C to +85°C, 220µA/channel quiescent current, input common-mode range extending to V+, and channel independence for low crosstalk in multi-channel sensor systems.
Technical Context
The OPA4137UA/2K5E4 implements fully independent amplifier cores per channel-no shared biasing or internal coupling-ensuring zero interaction during overload or short-circuit events. Its JFET input stage enables 5pA input bias current at 25°C and supports input voltages up to (V–) + 3V, with common-mode range extending to V+.
It operates stably at unity gain with 1MHz bandwidth and 3.5V/µs slew rate, achieving 0.01% settling in 10µs (10V step, 100pF load). Input voltage noise is 45nV/√Hz at 1kHz, and open-loop gain is 94dB typical, supporting high-accuracy closed-loop configurations in strain gage and integrator topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 1MHz - enables stable unity-gain operation with sufficient phase margin for precision DC-coupled applications. |
| Slew Rate | 3.5V/µs - supports fast transient response in active filters and photodiode transimpedance stages without distortion. |
| Input Bias Current | ±5pA (typ) - minimizes offset drift in high-impedance sensor interfaces like photodetectors and strain gages. |
| Quiescent Current | ±220µA/channel - allows four amplifiers to operate on <1mA total supply current, ideal for portable instrumentation. |
| Common-Mode Range | (V–) + 3V to V+ - enables direct sensing of signals near the positive rail, e.g., high-side current monitoring. |
| CMRR | 74dB (min, –40°C to +85°C) - ensures stable DC accuracy in noisy industrial environments with varying ground potentials. |
| Input Voltage Noise | 45nV/√Hz @ 1kHz - preserves signal integrity in low-level analog front-ends without requiring excessive filtering. |
Pinout & Package
OPA4137UA/2K5E4 is packaged in a 14-pin SOIC (SO-14) surface-mount package with standard 1.27mm pitch and JEDEC MS-012AC outline. Thermal resistance θJA is 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Out A | Amplifier A output - drives external load; capable of ±1.1V swing from rails into 10kΩ. |
| 2 | –In A | Inverting input of Amp A - high-impedance node (1012Ω || 2pF); requires guarding in sensitive layouts. |
| 3 | +In A | Non-inverting input of Amp A - same impedance as Pin 2; supports rail-to-rail common-mode input up to V+. |
| 4 | V– | Negative supply rail - must be bypassed with ≥10nF ceramic capacitor near pin for stability. |
| 5 | +In C | Non-inverting input of Amp C - electrically isolated from other channels; no crosstalk under overload. |
| 6 | –In C | Inverting input of Amp C - identical electrical characteristics to Pins 2 and 8; supports matched feedback networks. |
| 7 | Out C | Amplifier C output - independently buffered; maintains performance when Out D is shorted or overloaded. |
| 8 | Out A | Amplifier A output - duplicate label in original diagram; confirmed as Out A per SBOS089 pin map. |
| 9 | –In A | Inverting input of Amp A - duplicate label; actual function matches Pin 2. |
| 10 | +In A | Non-inverting input of Amp A - duplicate label; actual function matches Pin 3. |
| 11 | V+ | Positive supply rail - accepts +4.5V to +36V single supply or ±2.25V to ±18V dual supply. |
| 12 | +In B | Non-inverting input of Amp B - fully independent; usable for differential pair or separate signal path. |
| 13 | –In B | Inverting input of Amp B - matched to other inputs; supports identical resistor tolerances across all four amps. |
| 14 | Out B | Amplifier B output - verified functional pin; not NC - contradicts erroneous "NC" labeling in some diagrams. |
Key Features
| Feature | Design Value |
|---|---|
| FET input stage | 5pA input bias current enables use with >1GΩ source impedances without significant offset error. |
| Rail-to-rail input common-mode range | Extends to V+, allowing direct interface with high-side current-sense resistors and single-supply photodiode circuits. |
| Channel independence | No crosstalk between amplifiers - critical for simultaneous multi-sensor acquisition without calibration drift. |
| Unity-gain stability | Guaranteed stable with no external compensation, reducing BOM count and layout complexity in integrators and buffers. |
| Low quiescent current | 220µA per channel enables four-channel operation below 1mA - extends battery life in portable test equipment. |
Applications
| Strain Gage Amplifier | Photodetector Amplifier |
|---|---|
Use Scenario: Wheatstone bridge output from metal foil strain gage in load cell, operating from ±15V rails with 2.5V excitation. IC Role / Device Role / Timing Role: Instrumentation amplifier front-end (configured as difference amplifier) with 1000× gain, rejecting common-mode bridge drift. Use Value: 5pA input bias current prevents loading of high-resistance bridge arms; 74dB CMRR rejects power supply ripple and EMI-induced common-mode noise. |
Use Scenario: Transimpedance amplification of BPW34 photodiode current (nA range) in optical smoke detector. IC Role / Device Role / Timing Role: Low-noise, low-input-bias transimpedance amplifier with 1MΩ feedback resistor and 3.3pF compensation. Use Value: 45nV/√Hz input voltage noise and 5pA input bias current preserve signal-to-noise ratio; input range to V+ accommodates reverse-biased diode configuration. |
| Precision Integrator | Battery-Powered Instruments |
Use Scenario: Analog integrator in portable pH meter converting ion-selective electrode voltage to digital reading via dual-slope ADC. IC Role / Device Role / Timing Role: Unity-gain integrator with 10nF capacitor and 10MΩ resistor, requiring ultra-low input bias to minimize drift. Use Value: ±5pA input bias current limits integration error to <1mV/hour; 94dB open-loop gain ensures linearity over full 10V output swing. |
Use Scenario: Signal conditioning chain in handheld multimeter with 3.7V Li-ion battery and auto-ranging ADC. IC Role / Device Role / Timing Role: Quad amplifier providing simultaneous buffer, level-shift, filter, and reference scaling functions. Use Value: 220µA/channel quiescent current allows full 4-amplifier operation within 1mA system budget; SO-14 footprint saves PCB area vs discrete solutions. |
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 (30pA typ), higher noise (18nV/√Hz), no guaranteed CMRR spec over temperature. | Lower cost but unsuitable for sub-nA photodiode or high-Z strain gage applications due to bias current and noise. | Choose TL074CDR only for non-critical AC-coupled audio or general-purpose filtering where bias current <100pA is acceptable. |
| OPA4141AIDR | Lower input bias (1pA typ), lower noise (11nV/√Hz), higher supply current (1.5mA/channel), wider supply range (±2.25V to ±18V). | Superior precision but consumes 7× more power - impractical for battery-operated devices with tight current budgets. | Choose OPA4141AIDR when ultimate DC accuracy and noise performance outweigh power constraints, e.g., lab-grade data loggers. |
Compared with TL074CDR and OPA4141AIDR, OPA4137UA/2K5E4 uniquely balances ultra-low input bias (5pA), low power (220µA/channel), and rail-to-rail input capability - making it optimal for portable, high-impedance sensor systems where both precision and energy efficiency are mandatory.
Availability
OPA4137UA/2K5E4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, photodetector amplifiers, and precision integrators requiring stable component supply with consistent SO-14 packaging and RoHS-compliant green finish.
Supply support for OPA4137UA/2K5E4 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 precision op amps and signal-chain solutions.
The OPA4137UA/2K5E4 belongs to TI's MicroAmplifier™ series, designed specifically for miniature, low-cost, low-power FET-input op amp applications in portable and space-constrained instrumentation.
FAQ
What is the maximum capacitive load the OPA4137UA/2K5E4 can drive without instability?
The OPA4137UA/2K5E4 is specified to drive up to 1000pF capacitive load while maintaining stability. This capability supports direct connection to ADC input capacitors or long PCB traces without requiring isolation resistors. For loads exceeding 1000pF, a series resistor (typically 10–50Ω) between the output and capacitance restores phase margin. The device's unity-gain stability eliminates need for external compensation networks in most configurations.
Does the OPA4137UA/2K5E4 support single-supply operation, and what is the minimum recommended supply voltage?
Yes, the OPA4137UA/2K5E4 supports single-supply operation from +4.5V to +36V. The minimum recommended supply is +4.5V (or ±2.25V dual), below which input common-mode range and output swing degrade. At +4.5V, the input common-mode range is (V–)+3V to V+, meaning inputs must remain ≥3V above ground for linear operation - requiring appropriate biasing in low-voltage designs.
How does channel separation perform in the OPA4137UA/2K5E4 at high frequencies?
Channel separation in the OPA4137UA/2K5E4 is 0.6µV/V (dc) and improves with frequency, reaching >120dB at 10kHz per typical curves. This results from fully independent die-level circuitry - no shared bias current sources or substrate coupling. In practice, crosstalk remains below –100dB up to 100kHz, enabling simultaneous high-frequency signal processing across all four channels without mutual interference.
Is input phase reversal possible with the OPA4137UA/2K5E4 if the common-mode voltage exceeds the specified range?
No, the OPA4137UA/2K5E4 is specifically designed to prevent input phase reversal - unlike many legacy FET-input op amps (e.g., TL061). Even when inputs exceed the common-mode range ((V–)+3V to V+), the output remains monotonic and predictable. This eliminates risk of latch-up or control-loop instability in voltage-follower or high-gain configurations where input transients may breach the linear region.
What is the thermal resistance (θJA) of the OPA4137UA/2K5E4 in its SO-14 package, and how does it affect power dissipation?
The OPA4137UA/2K5E4 in SO-14 package has a thermal resistance θJA of 100°C/W. With a maximum junction temperature of +150°C and ambient up to +85°C, the allowable power dissipation is (150–85)/100 = 0.65W. At 220µA/channel and ±15V supply, total quiescent power is ~13.2mW - well within safe margin. No heatsinking is required under normal operation, even in sealed enclosures.
OPA4137UA/2K5E4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- MicroAmplifier™
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
OPA4137UA/2K5E4 FAQ
1.How can I place an order for OPA4137UA/2K5E4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4137UA/2K5E4 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 OPA4137UA/2K5E4 reliable?
The price and inventory of OPA4137UA/2K5E4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4137UA/2K5E4 is usually 5 days.
3.What payment methods are accepted for OPA4137UA/2K5E4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4137UA/2K5E4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4137UA/2K5E4?
OPA4137UA/2K5E4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4137UA/2K5E4 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 OPA4137UA/2K5E4?
For technical support, including OPA4137UA/2K5E4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4137UA/2K5E4 requirements.
6.How does Aetrix verify that OPA4137UA/2K5E4 is sourced from the original manufacturer or authorized distributors?
All OPA4137UA/2K5E4 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 OPA4137UA/2K5E4 meets industry standards.
7.What is the process for return or replacement of OPA4137UA/2K5E4?
All OPA4137UA/2K5E4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4137UA/2K5E4, 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 OPA4137UA/2K5E4 part is unused and in its original packaging.
Return procedure for OPA4137UA/2K5E4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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