My Inquiry
My Account
Texas Instruments LMV431BCM5X
- Part No.:
- LMV431BCM5X
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMV431BCM5X.pdf
- Description:
- IC VREF SHUNT ADJ 0.5% SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LMV431BCM5X from Texas Instruments is a precision 1.24-V adjustable shunt regulator in SOT-23-5 package, designed for low-voltage feedback control in power management circuits. It delivers 0.5% initial reference voltage tolerance, 55 µA minimum cathode current for regulation, 0.25 Ω dynamic output impedance, and operates across 0°C to 70°C. Used in 3-V off-line switching regulators and voltage monitors where zener-like performance at low voltage is required.
For engineers reviewing the LMV431BCM5X datasheet, LMV431BCM5X pinout, LMV431BCM5X application, or LMV431BCM5X equivalent, key selection criteria include its 1.24 V reference accuracy, SOT-23-5 thermal derating (2.2 mW/°C), stability with 10 nF–50 pF capacitive loads, and compatibility with two-resistor external programming for adjustable output up to 30 V.
Technical Context
The LMV431BCM5X implements a band-gap reference core with internal op-amp-style error amplifier topology, enabling precise cathode voltage control via negative feedback from cathode to adjust pin. Its functional diagram shows a three-terminal architecture (cathode, anode, adjust) operating as a programmable shunt element, not a series regulator.
It achieves temperature compensation via proprietary curvature correction yielding 39 ppm/°C typical drift over industrial range, and features fast turn-on response suitable for dynamic load monitoring. The device is stable without external compensation when driving capacitive loads between 10 nF and 50 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.24 V ±0.5% (typical 1.24 V, min 1.234 V, max 1.246 V at 25°C); sets base accuracy for all programmed outputs. |
| Initial Tolerance | 0.5% (LMV431B grade); enables tighter output regulation vs. LMV431 (1.5%) or LMV431A (1%) in feedback loops. |
| Dynamic Output Impedance | 0.25 Ω (typical); ensures minimal output voltage shift under varying cathode current (0.1–15 mA). |
| Min Cathode Current | 55 µA (typical); lowest current needed to maintain regulation-critical for ultra-low-power bias networks. |
| Temp Coefficient | 39 ppm/°C (typical); quantifies reference drift over temperature-directly impacts long-term stability in uncalibrated systems. |
| Operating Temp Range | 0°C to 70°C (commercial grade); defines ambient limits for guaranteed spec compliance without derating. |
| Package Power Dissipation | 0.28 W (SOT-23-5 at 25°C); derates linearly at 2.2 mW/°C above 25°C-limits max continuous cathode current at elevated temps. |
Pinout & Package
SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, RoHS-compliant tin (SN) lead finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Output terminal | Connected to regulated voltage node; sinks current to ground via external resistor network to set output voltage. |
| Anode (Pin 2) | Ground reference | Common return path for reference and cathode current; must be tied to system ground for proper operation. |
| Adjust (Pin 3) | Feedback input | High-impedance reference input (0.15–0.5 µA typical IREF); connects to resistor divider midpoint for voltage programming. |
| NC (Pin 4) | No connect | Internally unconnected; left floating or tied to ground per layout best practices to reduce noise coupling. |
| NC (Pin 5) | No connect | Internally unconnected; same handling as Pin 4-no electrical function, but affects thermal pad layout if used. |
Key Features
| Feature | Design Value |
|---|---|
| Low-voltage operation | 1.24 V reference enables regulation down to ~2.7 V in LDO-like shunt configurations-ideal for 3-V systems. |
| 0.5% initial tolerance | Reduces need for post-manufacturing calibration in precision feedback paths, lowering BOM and test cost. |
| Low 55 µA regulation current | Supports high-value resistor dividers (>1 MΩ), minimizing quiescent current in battery-powered voltage monitors. |
| 0.25 Ω dynamic impedance | Maintains <1 mV output shift per 1 mA cathode current change-critical for ripple rejection in switching regulator error amps. |
| Stable with 10 nF–50 pF loads | Eliminates need for external compensation capacitors in most applications, simplifying layout and reducing component count. |
Applications
| Shunt Regulator | Series Regulator |
|---|---|
Use Scenario: Providing precise 5-V rail from 12-V input in space-constrained industrial sensor nodes. IC Role / Device Role / Timing Role: Adjustable shunt element replacing Zener diode in parallel-regulation topology. Use Value: Enables 0.5% output accuracy without trimming resistors, while consuming only 55 µA quiescent current. | Use Scenario: Boosting regulation accuracy of a fixed-output 3.3-V LDO by injecting error signal into its feedback node. IC Role / Device Role / Timing Role: Precision voltage reference and error amplifier in series-pass configuration. Use Value: Improves line/load regulation from ±2% to ±0.5% using external resistor programming and low-impedance cathode drive. |
| Voltage Monitor | Error Amplifier |
Use Scenario: Detecting undervoltage condition (<2.8 V) on a microcontroller supply rail to trigger safe shutdown. IC Role / Device Role / Timing Role: Programmable threshold detector with hysteresis-capable output stage. Use Value: Achieves 10-mV threshold resolution using 1% resistors, with 39 ppm/°C drift limiting temp-induced false triggers. | Use Scenario: Closing feedback loop in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Isolated error amplifier transmitting regulation signal across optocoupler. Use Value: Delivers 0.25 Ω output impedance to drive optocoupler LED with minimal gain error across 0–15 mA cathode range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TL431ACDBVR | 2.495 V nominal reference, 1% initial tolerance, higher 1-mA min cathode current, SOT-23-5 package. | Requires different resistor scaling; less suitable for sub-3-V systems due to higher reference voltage. | Select when 2.5-V reference is acceptable and higher cathode current supports optocoupler drive. |
| LM4040CIM3-ADJ/NOPB | Adjustable 1.235–10 V reference, 0.5% tolerance, 60 µA max quiescent current, SOT-23-3 package. | Two-terminal (anode/cathode only); no adjust pin-requires different topology and lacks shunt regulation flexibility. | Choose for simpler two-terminal designs where external feedback resistor network is impractical. |
Compared with TL431ACDBVR and LM4040CIM3-ADJ/NOPB, the LMV431BCM5X offers lower reference voltage (1.24 V), lower regulation current (55 µA), and integrated adjust functionality-making it uniquely suited for compact, low-voltage, programmable shunt regulation where space and power efficiency are critical.
Availability
LMV431BCM5X is available at Aetrix Electronics and suitable for 3-V off-line switching regulators, voltage monitors, and low-dropout shunt regulators requiring stable component supply across commercial temperature range.
Supply support for LMV431BCM5X 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 analog ICs and power management solutions.
The LMV431x family was designed specifically for low-voltage, high-accuracy shunt regulation in space- and power-constrained applications such as portable electronics, industrial sensors, and isolated power supplies.
FAQ
What is the reference voltage tolerance of the LMV431BCM5X?
The LMV431BCM5X has a 0.5% initial reference voltage tolerance at 25°C, with typical values ranging from 1.234 V to 1.246 V. Over the full commercial temperature range (0°C to 70°C), deviation is specified at ±12 mV (±0.97%). This tight tolerance makes LMV431BCM5X suitable for applications demanding high baseline accuracy without post-production calibration.
Can the LMV431BCM5X replace a standard Zener diode?
Yes, the LMV431BCM5X can directly replace Zener diodes in shunt regulation applications, offering superior performance: 1.24 V reference vs. typical 2.4–36 V Zeners, 0.5% tolerance vs. 5–10%, and 0.25 Ω dynamic impedance vs. 10–100 Ω. Its three-terminal architecture (cathode/anode/adjust) enables precise external programming-unlike passive Zeners-and supports stable operation with small capacitive loads.
What is the minimum cathode current required for regulation in the LMV431BCM5X?
The LMV431BCM5X requires a minimum cathode current of 55 µA (typical) to maintain regulation, with a maximum of 80 µA across temperature. This low requirement allows use of high-value feedback resistors (e.g., 100 kΩ–1 MΩ), significantly reducing quiescent power in battery-operated voltage monitors and enabling compatibility with high-impedance control nodes.
Is the LMV431BCM5X stable with ceramic output capacitors?
Yes, the LMV431BCM5X is stable with ceramic capacitors ranging from 10 nF to 50 pF, as confirmed in the datasheet's stability boundary chart (Figure 19). Capacitors outside this range-especially >100 pF-may cause oscillation. For larger bulk capacitance, place a small 22–100 pF ceramic capacitor directly at the cathode pin, and add bulk capacitance downstream.
How does the LMV431BCM5X differ from the LMV431AIM5X?
The LMV431BCM5X is the commercial-grade (0°C to 70°C) version with 0.5% reference tolerance, while the LMV431AIM5X is the industrial-grade (−40°C to 85°C) variant with identical 0.5% tolerance but wider temperature specification and different part marking (N08A vs. N09C). Both use SOT-23-5 (DBV) packaging and share identical electrical characteristics within their respective temperature ranges.
LMV431BCM5X Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 30 V
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 80 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LMV431BCM5X FAQ
1.How can I place an order for LMV431BCM5X through Aetrix?
Please submit a Request for Quotation (RFQ) for LMV431BCM5X 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 LMV431BCM5X reliable?
The price and inventory of LMV431BCM5X are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMV431BCM5X is usually 5 days.
3.What payment methods are accepted for LMV431BCM5X?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMV431BCM5X transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMV431BCM5X?
LMV431BCM5X orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMV431BCM5X 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 LMV431BCM5X?
For technical support, including LMV431BCM5X datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMV431BCM5X requirements.
6.How does Aetrix verify that LMV431BCM5X is sourced from the original manufacturer or authorized distributors?
All LMV431BCM5X 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 LMV431BCM5X meets industry standards.
7.What is the process for return or replacement of LMV431BCM5X?
All LMV431BCM5X units undergo pre-shipment inspection (PSI). If there is an issue with LMV431BCM5X, 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 LMV431BCM5X part is unused and in its original packaging.
Return procedure for LMV431BCM5X:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMV431BCM5X Tags
-
TL431AIDBZR
Texas Instruments
-
TL431BQDBZR
Texas Instruments
-
AN431AN-ATRG1
Diodes Incorporated
-
LM4040CYM3-2.5-TR
Microchip Technology
-
LM4040CYM3-4.1-TR
Microchip Technology
-
LM4040EIM3-2.5/NOPB
Texas Instruments
-
AZ431LBNTR-G1
Diodes Incorporated
-
LM4040D20IDBZR
Texas Instruments
-
LM4041DIM3-ADJ/NOPB
Texas Instruments
-
LM4040DIM3X-2.5/NOPB
Texas Instruments
-
LM4040DIM3-2.5/NOPB
Texas Instruments
-
AZ431LANTR-G1
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
