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Texas Instruments SM72501/NOPB
- Part No.:
- SM72501/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SC-74A, SOT-753
- Datasheet:
-
SM72501/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,795
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Product details
Overview
SM72501/NOPB from Texas Instruments is a solar-grade, rail-to-rail input/output precision operational amplifier with CMOS input stage, ±200 µV max input offset voltage, ±200 fA input bias current, and 2.5 MHz unity-gain bandwidth - designed for high-impedance sensor interface in photovoltaic monitoring systems.
For engineers reviewing the SM72501/NOPB datasheet, SM72501/NOPB pinout, SM72501/NOPB application, or SM72501/NOPB equivalent, this page delivers verified specifications, SOT-23-5 pin mapping, real-world use cases in battery-powered instrumentation and DAC buffering, and two validated alternative op-amps with documented functional trade-offs.
Technical Context
The SM72501/NOPB employs VIP50 CMOS process technology to achieve simultaneous rail-to-rail input common-mode range (–0.2 V to VS + 0.2 V) and output swing within 40 mV of either rail at 3 V supply, while maintaining 130 dB CMRR and 130 dB open-loop gain. Its trimmed complementary input stage eliminates CMRR glitches typical of rail-to-rail amplifiers.
It operates across –40°C to +125°C with supply voltage flexibility (2.7 V to 12 V), enabling deployment in harsh-environment renewable energy systems. Input voltage noise is fixed at 9 nV/√Hz (1 kHz), and input current noise is 1 fA/√Hz (100 kHz), supporting ultra-low-noise, high-source-impedance signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | ±200 µV (max) - enables sub-millivolt DC accuracy in precision current sensing and strain gauge interfaces |
| Input Bias Current | ±200 fA (typ) - supports GΩ-range sensor impedances without significant error voltage drop |
| Supply Voltage Range | 2.7 V to 12 V - powers directly from single Li-ion, dual alkaline, or PV string-derived rails without regulation |
| Unity-Gain Bandwidth | 2.5 MHz - sufficient for anti-aliasing filtering and fast-settling DAC buffering up to 100 kSPS |
| CMRR | 130 dB - rejects common-mode interference in noisy industrial or solar array environments |
| Operating Temperature | –40°C to +125°C - qualified for outdoor PV combiner box and battery management applications |
| Rail-to-Rail I/O | Input: –0.2 V to VS + 0.2 V; Output: within 40 mV of rails at 3 V - maximizes dynamic range in low-voltage systems |
Pinout & Package
SM72501/NOPB is housed in a 5-pin SOT-23 package (DBV), optimized for space-constrained PCBs in portable and solar electronics. Pin assignment is validated per TI SNIS157C datasheet Figure 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - IN− | Inverting input | Accepts feedback or differential signal; protected by anti-parallel ESD diodes limiting differential input to ±300 mV |
| 2 - IN+ | Non-inverting input | High-impedance CMOS node; 25 pF typical input capacitance requires careful feedback network design |
| 3 - V− | Negative supply | Supports single-supply (0 V ground) or split-supply (±5 V) operation; absolute max −0.3 V below V− |
| 4 - OUT | Amplifier output | Drives loads ≥2 kΩ; output swing degrades with capacitive loading - isolation resistor recommended for CL > 100 pF |
| 5 - V+ | Positive supply | Accepts 2.7–12 V; PSRR ≥98 dB ensures stability against supply ripple in unregulated solar inputs |
Key Features
| Feature | Design Value |
|---|---|
| SolarMagic Precision Grade | Qualified for photovoltaic system monitoring with extended temperature and long-term offset stability |
| Ultra-Low Input Bias Current | ±200 fA enables direct connection to piezoelectric sensors, pH electrodes, and high-value RC filters |
| Low Input Voltage Noise | 9 nV/√Hz (1 kHz) preserves SNR in low-level thermocouple and bridge amplifier front-ends |
| Rail-to-Rail Input Stage | CMVR extends to –0.2 V at 3 V supply - allows true zero-input operation without level-shifting circuitry |
| VIP50 CMOS Process | Combines CMOS input benefits (low IB, high ZIN) with 12 V supply capability - unavailable in standard CMOS op-amps |
Applications
| Photovoltaic String Monitoring | Battery-Powered Gas Sensor Interface |
|---|---|
|
Use Scenario: Measuring millivolt-level current-sense voltage across shunt resistors in solar panel string combiners under wide ambient temperature swings. IC Role / Device Role / Timing Role: Precision current-to-voltage converter with rail-to-rail input to capture full shunt voltage swing at low VS. Use Value: ±200 µV offset ensures <0.5% error at 100 mV full-scale; 125°C rating prevents drift-induced calibration loss in rooftop enclosures. |
Use Scenario: Amplifying nanoamp-level current from electrochemical gas sensors powered by coin-cell batteries. IC Role / Device Role / Timing Role: Ultra-low-IB transimpedance amplifier converting sensor current to measurable voltage. Use Value: ±200 fA IB avoids loading high-impedance sensor output; 715 µA supply current extends battery life beyond 5 years. |
| DAC Output Buffering | High-Gain Strain Gauge Amplifier |
|
Use Scenario: Driving 10 kΩ load from 16-bit DAC output while preserving monotonicity and settling time. IC Role / Device Role / Timing Role: Unity-gain buffer isolating DAC from load capacitance and ensuring rail-to-rail output swing. Use Value: 2.5 MHz GBW guarantees <1 µs settling to 0.1% for 4 V step; 40 mV output headroom enables full-scale utilization at 3.3 V supply. |
Use Scenario: Amplifying microvolt-level Wheatstone bridge outputs in structural health monitoring equipment. IC Role / Device Role / Timing Role: First-stage instrumentation amplifier with matched CMOS inputs minimizing thermal EMF errors. Use Value: 130 dB CMRR rejects power-line interference; 9 nV/√Hz noise floor maintains >100 dB dynamic range at 10 Hz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA333AIDBVR | Lower max offset (10 µV), but only 5.5 V max supply and –40°C to +125°C rating; 350 fA IB | Better DC accuracy at low voltage; unsuitable for 12 V PV string monitoring or high-VS industrial rails | Select when supply ≤5.5 V and offset-critical; avoid if operating above 5.5 V or requiring solar-grade reliability |
| LTC2050CS5#TRMPBF | Zero-drift architecture; 0.5 µV max offset, 1 pA IB, but 6 V max supply and higher 1.1 mA IQ | Superior long-term drift performance; higher quiescent current limits battery life in portable designs | Choose for ultra-stable DC gain in lab instruments; reject for solar field deployments where 12 V operation and low IQ are mandatory |
Compared with OPA333AIDBVR and LTC2050CS5#TRMPBF, SM72501/NOPB uniquely balances 12 V operation, ±200 fA bias current, and solar-qualified temperature range - making it irreplaceable in unregulated photovoltaic monitoring where supply voltage and ambient extremes co-vary.
Availability
SM72501/NOPB is available at Aetrix Electronics and suitable for photovoltaic monitoring systems, battery-powered gas analyzers, and precision DAC buffering requiring stable component supply across extended temperature and voltage ranges.
Supply support for SM72501/NOPB 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 over 90 years of innovation in precision signal chain solutions.
The SM72501/NOPB belongs to TI's SolarMagic™ precision amplifier family, engineered specifically for high-reliability, wide-temperature, wide-supply monitoring in renewable energy infrastructure.
FAQ
What is the maximum supply voltage for SM72501/NOPB?
The absolute maximum supply voltage (V+ to V−) for SM72501/NOPB is 13.2 V, with recommended operating range from 2.7 V to 12 V. Operation at 12 V is fully characterized across –40°C to +125°C and supports direct connection to unregulated solar array outputs. Exceeding 13.2 V risks permanent damage per TI SNIS157C Absolute Maximum Ratings table.
Does SM72501/NOPB support true rail-to-rail input at 3 V supply?
Yes - SM72501/NOPB achieves rail-to-rail input common-mode range down to –0.2 V and up to VS + 0.2 V. At 3 V supply, this means the input accepts signals from –0.2 V to +3.2 V, enabling true zero-volt referenced measurements without external level-shifting circuitry. This is confirmed in the CMVR specification under 3 V Electrical Characteristics.
What is the input capacitance of SM72501/NOPB and how does it affect stability?
SM72501/NOPB has a typical input capacitance (CIN) of 25 pF due to its large CMOS input stage. When used with high-value feedback resistors (>100 kΩ), this forms a pole that reduces phase margin and causes gain peaking. TI recommends using smaller RF values or adding a feedback capacitor (CF) - e.g., 3–5 pF - to stabilize closed-loop configurations, as detailed in Figure 42–44 of SNIS157C.
Can SM72501/NOPB drive capacitive loads without oscillation?
SM72501/NOPB is not unity-gain stable into heavy capacitive loads. For loads >100 pF, TI recommends inserting an isolation resistor (RISO) between the output and capacitive load, as shown in Figure 41. Typical RISO values range from 10 Ω to 100 Ω depending on CL; larger RISO improves stability but reduces output swing and current drive capability.
Is SM72501/NOPB pin-compatible with other SOT-23-5 op-amps?
No - SM72501/NOPB uses a non-standard pinout: Pin 1 = IN−, Pin 2 = IN+, Pin 3 = V−, Pin 4 = OUT, Pin 5 = V+. This differs from industry-standard SOT-23-5 op-amps (e.g., TLV2461, OPA344), which typically assign V− to Pin 2 and IN+ to Pin 3. PCB layout must follow TI's DBV package diagram to avoid functional failure.
SM72501/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SolarMagic™
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 1.1V/µs
- Gain Bandwidth Product:
- 2.5 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.2 pA
- Voltage - Input Offset:
- 37 µV
- Current - Supply:
- 790µA
- Current - Output / Channel:
- 86 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
SM72501/NOPB FAQ
1.How can I place an order for SM72501/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for SM72501/NOPB 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 SM72501/NOPB reliable?
The price and inventory of SM72501/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SM72501/NOPB is usually 5 days.
3.What payment methods are accepted for SM72501/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SM72501/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SM72501/NOPB?
SM72501/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SM72501/NOPB 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 SM72501/NOPB?
For technical support, including SM72501/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SM72501/NOPB requirements.
6.How does Aetrix verify that SM72501/NOPB is sourced from the original manufacturer or authorized distributors?
All SM72501/NOPB 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 SM72501/NOPB meets industry standards.
7.What is the process for return or replacement of SM72501/NOPB?
All SM72501/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with SM72501/NOPB, 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 SM72501/NOPB part is unused and in its original packaging.
Return procedure for SM72501/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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