My Inquiry
My Account
Texas Instruments LM4040C30IDCKR
- Part No.:
- LM4040C30IDCKR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LM4040C30IDCKR.pdf
- Description:
- IC VREF SHUNT 0.5% SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,967
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM4040C30IDCKR from Texas Instruments is a precision micropower shunt voltage reference with a fixed 3.0V output, ±0.5% initial accuracy (C grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-drift reference in analog signal chains for industrial sensors and portable data-acquisition systems.
For engineers reviewing the LM4040C30IDCKR datasheet, LM4040C30IDCKR pinout, LM4040C30IDCKR application, or LM4040C30IDCKR equivalent, key selection criteria include its SC-70-5 package footprint, guaranteed performance over –40°C to +85°C, no-output-capacitor requirement, and compatibility with high-impedance feedback networks in precision ADC biasing and sensor excitation circuits.
Technical Context
The LM4040C30IDCKR operates as a two-terminal shunt reference, sinking cathode current (IZ) to maintain a stable 3.0V reverse breakdown voltage across its cathode–anode terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve ±0.5% initial tolerance at 25°C and maintains low dynamic impedance (0.4Ω typical at 1mA) across its full operating current range.
It delivers consistent performance without external capacitors-stable with all capacitive loads-and features thermal hysteresis of only 0.08% after cycling between –40°C and +125°C. The device's 100ppm/°C max temperature coefficient ensures <±3.45mV drift over its industrial temperature range (–40°C to +85°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.0V nominal at IZ = 100μA; enables direct biasing of 3V ADC references and op-amp rails. |
| Initial Accuracy | ±0.5% at 25°C (C grade); supports 12-bit system accuracy without calibration. |
| Temp Coefficient | 100ppm/°C max; contributes ≤±3.45mV error over –40°C to +85°C ambient. |
| Noise (10Hz–10kHz) | 35μVRMS typical; minimizes quantization uncertainty in 16-bit+ SAR ADCs. |
| Min Cathode Current | 45μA typical; allows ultra-low-power operation in battery-powered sensor nodes. |
| Dynamic Impedance | 0.4Ω typical at 1mA; ensures minimal load regulation error under varying sink current. |
| Operating Temp Range | –40°C to +85°C (I-grade); qualified for industrial control and field instrumentation. |
Pinout & Package
LM4040C30IDCKR is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm. This space-constrained surface-mount package supports high-density PCB layouts while maintaining thermal performance (RθJA = 252°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Cathode (Pin 3) | Shunt current input / voltage sense node | Connects to regulated supply rail; sinks current to hold 3.0V at this node relative to anode. |
| Anode (Pin 1) | Reference ground / common return | Typically tied to system ground; forms the reference potential for cathode voltage. |
| NC (Pins 4, 5) | No internal connection | Must be left floating or grounded per layout best practices; no electrical function. |
| Pin 2* | Internal Zener substrate tap | Must float or connect to anode; improves EMI immunity in noisy environments (e.g., near switching regulators). |
Key Features
| Feature | Design Value |
|---|---|
| Zero-output-capacitor stability | Eliminates BOM cost and board area for external bypass caps; simplifies layout in space-constrained modules. |
| Low 35μVRMS noise | Reduces effective number of bits (ENOB) degradation in precision 16-bit+ data converters. |
| 45μA minimum operating current | Enables use in always-on sensor front-ends powered by energy-harvesting sources. |
| 100ppm/°C tempco (max) | Ensures sub-10mV total drift over full industrial temperature range-critical for uncalibrated field transmitters. |
| SC-70-5 package | Provides 30% smaller footprint than SOT-23-3 while retaining compatible reflow profiles and test accessibility. |
Applications
| Industrial Sensor Signal Conditioning | Portable Data-Acquisition Front-End |
|---|---|
Use Scenario: High-accuracy bridge sensor excitation and ADC reference in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Shunt voltage reference providing stable 3.0V bias for Wheatstone bridge excitation and 16-bit SAR ADC reference input. Use Value: ±0.5% initial accuracy and 100ppm/°C tempco ensure <±0.1% total gain error over –40°C to +85°C without calibration. |
Use Scenario: Battery-powered handheld multimeter with dual-slope or sigma-delta ADC requiring low-noise, low-quiescent reference. IC Role / Device Role / Timing Role: Micropower shunt reference supplying clean 3.0V reference to ADC and analog front-end op-amps. Use Value: 45μA min cathode current and 35μVRMS noise enable >10-year battery life and 16-bit ENOB at 1ksps sampling. |
| Field Transmitter Loop-Powered Design | Precision Audio Level Detection |
Use Scenario: 4–20mA loop-powered temperature transmitter where power budget is limited to <4mA total. IC Role / Device Role / Timing Role: Low-current shunt reference establishing precise 3.0V reference for RTD-to-digital conversion and DAC output scaling. Use Value: Stable operation down to 45μA allows reference circuit to consume <0.15mW-leaving ample headroom for microcontroller and transceiver. |
Use Scenario: Dynamic range compression circuit in studio-grade audio interface requiring accurate DC offset and threshold detection. IC Role / Device Role / Timing Role: Low-noise 3.0V reference for comparator hysteresis and RMS-to-DC converter biasing. Use Value: 35μVRMS noise prevents audible hiss modulation; SC-70 package enables integration into tight audio signal path layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4040C30IDBZR | SOT-23-3 package (DBZ), same 3.0V/C-grade specs, RθJA = 206°C/W vs. 252°C/W. | Better thermal performance in high-power-density layouts; requires different land pattern and stencil. | Choose for higher ambient temperature margin or when SC-70 assembly capability is unavailable. |
| MAX6003EUR+T | 3.0V shunt reference, ±0.5% accuracy, but higher 50μVRMS noise and 60μA min current. | Less suitable for ultra-low-noise 16-bit+ ADCs or sub-60μA energy-harvesting designs. | Consider only if MAX brand qualification or specific supply-chain alignment is required. |
Compared with LM4040C30IDCKR, the DBZ variant offers superior thermal resistance for thermally constrained boards, while the MAX6003 trades off noise and quiescent current for alternate sourcing-neither is pin-compatible, and both require layout revision and validation.
Availability
LM4040C30IDCKR is available at Aetrix Electronics and suitable for industrial sensor conditioning, portable data-acquisition front-ends, and field transmitter loop-powered designs requiring stable component supply with guaranteed long-term continuity.
Supply support for LM4040C30IDCKR 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 and high-volume manufacturing reliability.
The LM4040 series was engineered for cost-sensitive, space-constrained applications demanding micropower operation, zero-capacitor stability, and robust industrial temperature performance-targeting PLCs, field instruments, and portable measurement tools.
FAQ
What is the maximum cathode current rating for LM4040C30IDCKR?
The absolute maximum cathode current for LM4040C30IDCKR is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA risks exceeding the device's power dissipation limit in the SC-70-5 package, especially above 25°C ambient. For continuous operation, keep IZ ≤15mA and verify junction temperature using RθJA = 252°C/W.
Does LM4040C30IDCKR require an external output capacitor?
No, LM4040C30IDCKR is explicitly designed to be stable with all capacitive loads and does not require an external output capacitor. Its internal architecture ensures phase margin retention even with >1μF capacitance on the cathode node-enabling simplified layout in noise-sensitive applications like precision ADC reference paths where capacitor parasitics could degrade performance.
How does the pin 2* terminal function in LM4040C30IDCKR?
In LM4040C30IDCKR, Pin 2* is an internal Zener substrate tap. TI recommends leaving it floating or connecting it directly to the anode (Pin 1) to suppress high-frequency noise coupling-especially critical in EMI-prone environments such as proximity to switching power supplies or motor drives. It has no DC current path and must never be driven externally.
What is the long-term stability specification for LM4040C30IDCKR?
LM4040C30IDCKR exhibits 120ppm long-term stability after 1000 hours of operation at 25°C and 100μA cathode current. This equates to a maximum drift of ±0.36mV on the 3.0V output, supporting applications where recalibration intervals exceed one year-such as remote environmental monitoring nodes deployed in inaccessible locations.
Can LM4040C30IDCKR operate at –40°C to +125°C?
No-LM4040C30IDCKR (suffix 'I') is characterized for –40°C to +85°C only. The extended-range version is LM4040C30QDCKR (suffix 'Q'), rated for –40°C to +125°C. Using the 'I' grade beyond +85°C violates specifications and may cause increased tempco, reduced accuracy, or accelerated parametric drift; thermal derating is not supported in datasheet limits.
LM4040C30IDCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 3V
- Voltage - Output (Max):
- -
- Current - Output:
- 15 mA
- Tolerance:
- ±0.5%
- Temperature Coefficient:
- 100ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 35µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 82 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
LM4040C30IDCKR FAQ
1.How can I place an order for LM4040C30IDCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4040C30IDCKR 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 LM4040C30IDCKR reliable?
The price and inventory of LM4040C30IDCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4040C30IDCKR is usually 5 days.
3.What payment methods are accepted for LM4040C30IDCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4040C30IDCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4040C30IDCKR?
LM4040C30IDCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4040C30IDCKR 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 LM4040C30IDCKR?
For technical support, including LM4040C30IDCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4040C30IDCKR requirements.
6.How does Aetrix verify that LM4040C30IDCKR is sourced from the original manufacturer or authorized distributors?
All LM4040C30IDCKR 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 LM4040C30IDCKR meets industry standards.
7.What is the process for return or replacement of LM4040C30IDCKR?
All LM4040C30IDCKR units undergo pre-shipment inspection (PSI). If there is an issue with LM4040C30IDCKR, 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 LM4040C30IDCKR part is unused and in its original packaging.
Return procedure for LM4040C30IDCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM4040C30IDCKR 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…
