My Inquiry
My Account
Texas Instruments LM4040D82ILP
,TO-226_straightlead.jpg)
- Part No.:
- LM4040D82ILP
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM4040D82ILP.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:986
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040D82ILP from Texas Instruments is a precision micropower shunt voltage reference with 8.192V nominal output, ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-noise reference in analog input modules and field transmitters requiring high stability over –40°C to 85°C.
For engineers reviewing the LM4040D82ILP datasheet, LM4040D82ILP pinout, LM4040D82ILP application, or LM4040D82ILP equivalent, this page delivers verified specifications, package mapping to SOT-23-3 (LP), real-world use scenarios, and two validated alternative parts for industrial-grade voltage reference selection.
Technical Context
The LM4040D82ILP operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a precise 8.192V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves D-grade tolerance without external components, and it remains stable with any capacitive load - eliminating need for output capacitance.
It features low dynamic impedance (≤1.1Ω at 1mA), thermal hysteresis of 0.08%, and long-term stability of 120ppm after 1000 hours. The device is characterized for industrial temperature range (–40°C to +85°C) and uses fuse-based trimming for production consistency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 8.192V nominal at IZ = 100μA; enables exact binary-scaled ADC reference in 13-bit+ systems |
| Initial Accuracy | ±1.0% max at 25°C (D grade); supports cost-sensitive industrial sensing without calibration |
| Temp Coefficient | 150ppm/°C max; contributes ≤±0.78% drift over –40°C to +85°C ambient range |
| Operating Current | 45μA min to 15mA max; allows ultra-low-power sensor nodes and high-current buffer stages |
| Output Noise | 35μVRMS (10Hz–10kHz); preserves SNR in precision 16-bit data acquisition front-ends |
| Dynamic Impedance | ≤1.1Ω at 1mA; minimizes load-induced voltage shift in varying-current applications |
| Thermal Hysteresis | 0.08% over –40°C ↔ 125°C cycling; ensures repeatable reference value after thermal stress |
Pinout & Package
LM4040D82ILP is packaged in a 3-pin TO-92 (LP) through-hole package measuring 4.83mm × 3.68mm. Pin 1 is Cathode, Pin 2 is Anode (ground), and Pin 3 is NC (No Internal Connection) - must float or connect to anode per TI EMI guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 1) | Shunt current input / voltage sense node | Sinks all cathode current (IZ); connects to regulated supply rail via series resistor |
| Anode (Pin 2) | Common reference ground | Must be connected to system ground; defines 0V reference for output voltage |
| NC (Pin 3) | No internal connection | Leads to open circuit; TI recommends connecting to anode in high-EMI environments |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor operation | Stable with all capacitive loads - eliminates BOM cost and layout area for decoupling caps |
| Micropower startup | 45μA minimum cathode current enables battery-powered operation for >10 years in 10μA systems |
| Wide current range | Operates reliably from 45μA to 15mA - supports both ultra-low-power sensors and high-drive buffers |
| Extended temp range | Specified from –40°C to +85°C - suitable for industrial control cabinets and outdoor field equipment |
| Low noise performance | 35μVRMS noise floor maintains ≥98dB SNR in 16-bit SAR ADC reference paths |
Applications
| Analog Input Module | Field Transmitter |
|---|---|
Use Scenario: 4–20mA loop-powered sensor interface with 16-bit ADC digitization. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 8.192V reference for ratiometric ADC conversion. Use Value: Enables direct 13-bit binary scaling (8.192V = 213 × 1mV), eliminating software gain correction. |
Use Scenario: Temperature/pressure transmitter operating in oil & gas wellhead enclosures. IC Role / Device Role / Timing Role: Precision reference for signal conditioning and DAC output scaling in harsh industrial environments. Use Value: 150ppm/°C TC and 0.08% thermal hysteresis ensure repeatability across daily thermal cycles. |
| Data-Acquisition System | Energy Infrastructure |
Use Scenario: Portable power quality analyzer with isolated 16-bit delta-sigma ADC frontend. IC Role / Device Role / Timing Role: Low-noise 8.192V reference for anti-aliasing filter calibration and ADC reference rail. Use Value: 35μVRMS noise prevents degradation of >95dB THD+N measurement fidelity. |
Use Scenario: Smart meter voltage monitoring channel with extended lifetime requirement. IC Role / Device Role / Timing Role: Stable shunt reference for metrology-grade voltage divider feedback in AC sensing path. Use Value: 120ppm long-term stability over 1000h reduces recalibration frequency in utility-grade meters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C82ILP | 0.5% initial accuracy, 100ppm/°C TC (C grade) vs. LM4040D82ILP's 1.0%/150ppm | Better stability over temperature; suited for higher-accuracy industrial DAQ where cost premium is acceptable | Select when tighter TC and initial tolerance justify ~15% BOM cost increase |
| TLVH431ACDBZR | Adjustable 1.24V–18V shunt reference; 0.5% accuracy; 3-pin SOT-23; requires two external resistors | Offers programmability but adds resistor matching error and layout complexity vs. fixed 8.192V | Choose only if system requires multiple reference voltages or future voltage flexibility |
Compared with LM4040C82ILP, the LM4040D82ILP trades 0.5% accuracy and lower TC for lower cost and simpler qualification; versus TLVH431ACDBZR, it eliminates resistor network errors and saves board space but fixes the output at 8.192V.
Availability
LM4040D82ILP is available at Aetrix Electronics and suitable for analog input modules, field transmitters, and energy infrastructure applications requiring stable component supply across extended product lifecycles.
Supply support for LM4040D82ILP 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 reference design.
The LM4040 series was developed specifically for cost-sensitive, space-constrained industrial and instrumentation applications demanding micropower operation, low noise, and robust thermal performance without external compensation.
FAQ
What is the maximum cathode current rating for LM4040D82ILP?
The absolute maximum cathode current for LM4040D82ILP is 25mA per TI's Absolute Maximum Ratings table. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overload in TO-92 packaging unless heatsinking is applied. Continuous operation above 15mA requires verification of junction temperature rise using RθJA = 206°C/W.
Does LM4040D82ILP require an output capacitor for stability?
No, LM4040D82ILP is inherently stable with all capacitive loads and does not require an output capacitor. This is confirmed in the device description and "Stable with all capacitive loads; no output capacitor required" feature bullet. Adding capacitance may even degrade transient response but will not cause oscillation.
What is the meaning of the 'LP' suffix in LM4040D82ILP?
The 'LP' suffix denotes the TO-92 package variant of the LM4040D82ILP. Per TI's packaging documentation, LP corresponds to the 3-pin through-hole TO-92 outline (4.83mm × 3.68mm), distinct from DBZ (SOT-23) or DCK (SC-70) variants. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC.
How does the 8.192V output of LM4040D82ILP benefit data acquisition systems?
The 8.192V output equals 213 mV, enabling direct 13-bit binary scaling in ADC reference designs - e.g., a 16-bit ADC with 8.192V reference yields exactly 0.5mV/LSB. This eliminates gain calibration and simplifies firmware, especially in portable DAQ systems where LM4040D82ILP's 45μA min current extends battery life.
Can LM4040D82ILP be used in automotive applications?
LM4040D82ILP is specified for –40°C to +85°C (industrial grade), not the full AEC-Q100 automotive temperature range (–40°C to +125°C). While it may function in under-hood environments, TI does not qualify or guarantee performance beyond 85°C ambient. For automotive use, LM4040D82IQ (Q-grade, –40°C to +125°C) is the qualified variant.
LM4040D82ILP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 8.192V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 130µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 115 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM4040D82ILP FAQ
1.How can I place an order for LM4040D82ILP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040D82ILP 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 LM4040D82ILP reliable?
The price and inventory of LM4040D82ILP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040D82ILP is usually 5 days.
3.What payment methods are accepted for LM4040D82ILP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040D82ILP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040D82ILP?
LM4040D82ILP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040D82ILP 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 LM4040D82ILP?
For technical support, including LM4040D82ILP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040D82ILP requirements.
6.How does Aetrix verify that LM4040D82ILP is sourced from the original manufacturer or authorized distributors?
All LM4040D82ILP 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 LM4040D82ILP meets industry standards.
7.What is the process for return or replacement of LM4040D82ILP?
All LM4040D82ILP units undergo pre-shipment inspection (PSI). If there is an issue with LM4040D82ILP, 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 LM4040D82ILP part is unused and in its original packaging.
Return procedure for LM4040D82ILP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040D82ILP 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…
