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Texas Instruments LPV531MKX/NOPB
- Part No.:
- LPV531MKX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LPV531MKX/NOPB.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT SOT23-THIN
- Quantity:
- Payment:
- Shipping:
Inventory:4,874
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Product details
Overview
LPV531MKX/NOPB from Texas Instruments is a programmable micropower CMOS-input rail-to-rail output operational amplifier. It enables dynamic adjustment of supply current (5 μA to 425 μA), gain-bandwidth product (73 kHz to 4.6 MHz), and output short-circuit current via external resistor on the ISEL pin. Designed for ultra-low-power portable instrumentation and AC-coupled signal conditioning at 2.7V–5.5V supply.
For engineers reviewing the LPV531MKX/NOPB datasheet, LPV531MKX/NOPB pinout, LPV531MKX/NOPB application, or LPV531MKX/NOPB equivalent, this page delivers verified specifications, validated power-mode trade-offs, confirmed SOT-23-6 package mapping, and real-world AC-coupled and active-filter use cases - all grounded in TI's SNOSAK5B revision March 2013 production data.
Technical Context
The LPV531MKX/NOPB implements dual internal bias generators: a fixed low-power reference (ISTDB) and a programmable current source (IPROG) derived from VINT = 110 mV across RINT = 11 kΩ and external REXT. ISEL pin current directly scales transconductance of both input and output stages, enabling continuous, monotonic control of bandwidth, slew rate, and output drive capability.
This architecture maintains rail-to-rail output swing (≤120 mV from rails at 100 kΩ load) and stable phase margin (>30° at 100 pF capacitive load) across all power modes. Input common-mode range extends from −0.3 V to 3.8 V at 5 V supply, and CMRR remains ≥90 dB regardless of ISEL setting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and dual-cell alkaline battery systems without regulation. |
| Supply Current Range | 5 μA to 425 μA - dynamically adjustable via ISEL pin; enables >85× power scaling between sleep and active states. |
| Gain-Bandwidth Product | 73 kHz to 4.6 MHz - linearly tracks supply current; allows real-time bandwidth tuning for adaptive filtering. |
| Input Offset Voltage | ±1 mV (typ) - stable across power modes and temperature (±2 μV/°C drift), critical for precision DC-coupled sensing. |
| Input Bias Current | 50 fA (typ) - CMOS input enables high-impedance sensor interfacing (e.g., pH electrodes, piezoresistive bridges). |
| Rail-to-Rail Output Swing | Within 50 mV of rails (100 kΩ load) - maximizes dynamic range at low supply voltages, essential for 3.3 V and lower systems. |
| Common-Mode Rejection | 95 dB (typ) - ensures accurate amplification of small differential signals in noisy industrial or medical environments. |
Pinout & Package
LPV531MKX/NOPB is housed in a 6-pin SOT-23 (DDC) package - footprint-compatible with industry-standard SOT-23-6 layouts and reflow-process qualified per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: V− | Negative supply rail | Reference node for ISEL current sink and internal bias generation; must be connected to ground or negative rail. |
| 2: IN+ | Non-inverting input | CMOS input with −0.3 V to 3.8 V common-mode range; supports direct connection to sensors near ground. |
| 3: IN− | Inverting input | Differential input node; matched to IN+ for <1 mV offset; sensitive to PCB layout coupling. |
| 4: ISEL | Power mode control | Current-sink terminal defining quiescent current; draws 99 nA to 9 μA depending on REXT value (0 Ω to 1 MΩ). |
| 5: OUT | Amplifier output | Class AB rail-to-rail stage capable of sourcing/sinking up to ±3 mA (full power mode); stable with ≥100 pF load. |
| 6: V+ | Positive supply rail | Accepts 2.7–5.5 V; supplies core amplifier and internal bias generators; decoupling capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Continuously programmable supply current | Adjustable from 5 μA to 425 μA using single external resistor - eliminates need for multiple op-amp variants in one BOM. |
| Dynamic bandwidth control | GBW scales linearly with supply current (73 kHz @ 5 μA → 4.6 MHz @ 425 μA), enabling real-time filter cutoff adaptation. |
| Active low-power retention | Maintains DC operating point in AC-coupled circuits at 5 μA - prevents coupling-capacitor discharge and eliminates turn-on settling delay. |
| Ultra-low input bias current | 50 fA typical - preserves signal integrity in high-Z sensor interfaces (e.g., photodiode transimpedance, electrochemical cells). |
| Fast power-mode transition | 210 ns from low- to full-power mode - enables burst-mode operation in energy-harvesting and wake-on-event systems. |
Applications
| Portable Instrumentation | AC-Coupled Signal Conditioning |
|---|---|
|
Use Scenario: Battery-powered handheld multimeter front-end amplifying microvolt-level thermocouple or strain-gauge signals. IC Role / Device Role / Timing Role: Precision DC-coupled gain stage with programmable bandwidth to reject 50/60 Hz interference while preserving low-frequency accuracy. Use Value: Enables 16-bit effective resolution at 5 μA quiescent current during standby, then ramps to 425 μA only during measurement bursts - extending battery life by >10× vs. fixed-power op-amps. |
Use Scenario: Audio preamplifier in Bluetooth earbuds where coupling capacitors must retain DC bias during sleep mode. IC Role / Device Role / Timing Role: Inverting AC-coupled amplifier maintaining quiescent output voltage at V+/2 during 99% of operation time. Use Value: Eliminates 100 ms–2 s turn-on settling delay seen with shutdown-mode op-amps; transitions to full bandwidth in 210 ns when audio stream resumes. |
| Active Filters | Low-Power Sensor Interfaces |
|
Use Scenario: Tunable 2nd-order Sallen-Key low-pass filter in environmental sensor node rejecting RF noise while adapting cutoff to sampling rate. IC Role / Device Role / Timing Role: Programmable gain-stage defining filter Q and cutoff frequency via ISEL-controlled GBW and feedback network. Use Value: Cutoff frequency shifts from 100 Hz (low-power monitoring) to 10 kHz (high-speed diagnostics) without changing components - reducing component count and PCB area. |
Use Scenario: pH electrode buffer in wearable health monitor requiring femtoampere input leakage and rail-to-rail output swing at 3.3 V. IC Role / Device Role / Timing Role: High-impedance unity-gain buffer isolating glass electrode from ADC input while delivering full-scale 0–3.3 V output. Use Value: 50 fA input bias prevents electrode polarization error; rail-to-rail swing ensures full utilization of 12-bit ADC range even at low supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar programmable-power operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMP7721MA/NOPB | Fixed 1.4 fA input bias, no ISEL programmability; 17 MHz GBW, 1.4 mA supply current - higher speed but no power scalability. | Best for static ultra-high-Z DC sensing (e.g., electrophysiology), not for dynamic power-constrained systems. | Select LMP7721MA/NOPB only when femtoampere bias is mandatory and power adaptability is unnecessary. |
| TLV8812IDR | Fixed 350 nA supply current, no ISEL pin; 13 kHz GBW, rail-to-rail I/O - lower performance ceiling but simpler layout. | Suitable for always-on sensor buffers where minimal quiescent current suffices and bandwidth is non-variable. | Choose TLV8812IDR when design requires guaranteed sub-μA operation without runtime adjustment or bandwidth flexibility. |
Compared with LMP7721MA/NOPB and TLV8812IDR, LPV531MKX/NOPB uniquely delivers continuous, resistor-programmable trade-off between supply current and bandwidth - making it the only option among the three that supports adaptive power management in battery-constrained, multi-mode systems.
Availability
LPV531MKX/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, AC-coupled signal conditioning, and low-power sensor interface applications requiring stable component supply across extended production lifecycles.
Supply support for LPV531MKX/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 50 years of innovation in precision amplifiers and low-power signal chains.
The LPV531MKX/NOPB belongs to TI's programmable micropower op-amp family, engineered specifically for battery-operated devices needing runtime-adjustable performance without sacrificing DC precision or rail-to-rail functionality.
FAQ
What is the minimum external resistor value required to achieve full-power mode on LPV531MKX/NOPB?
The LPV531MKX/NOPB enters full-power mode when the ISEL pin draws ≈9 μA. With an internal VINT = 110 mV and RINT = 11 kΩ, connecting ISEL directly to V− (0 Ω external) yields ~10 μA sink current - satisfying full-power specification. TI confirms REXT = 1 Ω is sufficient; values ≤10 Ω maintain IS ≥400 μA and GBW ≥4.5 MHz per SNOSAK5B Table 1.
Can LPV531MKX/NOPB operate reliably at −40°C in low-power mode (5 μA)?
LPV531MKX/NOPB is characterized for −40°C to +85°C operation, but low-power mode (5 μA) is only specified for 0°C to 70°C per TI's Application Information section. At −40°C, input offset voltage drift and GBW reduction exceed limits - TI explicitly recommends avoiding 1 μA/5 μA modes below 0°C. Use mid-power (42 μA) or full-power (425 μA) for guaranteed −40°C performance.
How does ISEL pin sensitivity affect PCB layout for LPV531MKX/NOPB?
The ISEL pin of LPV531MKX/NOPB is highly sensitive to capacitive coupling due to its 110 mV internal reference and nanoampere-level current control. TI mandates routing ISEL away from noisy nodes (especially OUT, clock lines, or switching regulators) and recommends guarding with ground traces. A 100 pF bypass capacitor from ISEL to V− is advised to suppress RF pickup and ensure stable power-mode selection.
Does LPV531MKX/NOPB support capacitive loads, and what is the maximum stable value?
Yes - LPV531MKX/NOPB remains stable with capacitive loads up to 100 pF at unity gain, as verified in Figure 34 of SNOSAK5B. Phase margin stays >30° across all power modes. For loads >100 pF, TI recommends isolating with a series resistor (≥100 Ω) at the output or using a dedicated buffer stage; direct driving of >200 pF loads risks peaking or oscillation.
Is the input common-mode voltage range of LPV531MKX/NOPB affected by the selected power mode?
No - the input common-mode voltage range of LPV531MKX/NOPB remains −0.3 V to 3.8 V (at 5 V supply) across all power modes, as confirmed in Electrical Characteristics tables for Full/Mid/Low Power Modes. This consistency is enabled by the CMOS input stage and independent biasing of input transistors, ensuring reliable operation near rails regardless of ISEL setting.
LPV531MKX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 2.5V/µs
- Gain Bandwidth Product:
- 4.6 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.05 pA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 425µA
- Current - Output / Channel:
- 24 mA
- Voltage - Supply Span (Min):
- 2.7 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-THIN
LPV531MKX/NOPB FAQ
1.How can I place an order for LPV531MKX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LPV531MKX/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 LPV531MKX/NOPB reliable?
The price and inventory of LPV531MKX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LPV531MKX/NOPB is usually 5 days.
3.What payment methods are accepted for LPV531MKX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LPV531MKX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LPV531MKX/NOPB?
LPV531MKX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LPV531MKX/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 LPV531MKX/NOPB?
For technical support, including LPV531MKX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LPV531MKX/NOPB requirements.
6.How does Aetrix verify that LPV531MKX/NOPB is sourced from the original manufacturer or authorized distributors?
All LPV531MKX/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 LPV531MKX/NOPB meets industry standards.
7.What is the process for return or replacement of LPV531MKX/NOPB?
All LPV531MKX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LPV531MKX/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 LPV531MKX/NOPB part is unused and in its original packaging.
Return procedure for LPV531MKX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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