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Texas Instruments LT1004CDR-1-2
- Part No.:
- LT1004CDR-1-2
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1004CDR-1-2.pdf
- Description:
- IC VREF SHUNT 0.32% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,302
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Product details
Overview
LT1004CDR-1-2 from Texas Instruments is a two-terminal micropower band-gap voltage reference IC delivering 1.235 V nominal output with ±4 mV initial accuracy, 20 ppm/°C temperature coefficient, and 0.6 Ω reference impedance at 100 µA. It operates from 8 µA to 20 mA supply current and serves as precision biasing and calibration reference in portable instrumentation and battery-powered systems.
For engineers reviewing the LT1004CDR-1-2 datasheet, LT1004CDR-1-2 pinout, LT1004CDR-1-2 application, or LT1004CDR-1-2 equivalent, key selection criteria include low-quiescent-current stability (≤15 µA typical), minimal thermal drift across 0°C–70°C, compatibility with high-impedance sensing circuits, and direct replacement capability for LM285/LM385 series references.
Technical Context
The LT1004CDR-1-2 implements a monolithic band-gap reference architecture with internal trimming to achieve tight initial tolerance without external adjustment. Its two-terminal configuration functions as a shunt reference, sinking current through the cathode while maintaining stable voltage across anode-to-cathode terminals.
Designed for ultra-low-power operation, it achieves 20 ppm/°C average temperature coefficient over full industrial range and exhibits only 10 mV output variation from 1 mA to 20 mA load current - enabling use in current-loop transmitters and energy-constrained sensor front-ends where supply headroom is limited.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Nominal Voltage | 1.235 V - Stable reference point for ADC biasing, DAC offset correction, and analog signal conditioning |
| Initial Accuracy | ±4 mV - Enables single-point calibration in portable meters without factory trimming |
| Temp Coefficient | 20 ppm/°C - Ensures ≤0.25 mV drift over 0°C–70°C ambient, critical for field-deployed test gear |
| Ref Impedance | 0.6 Ω at 100 µA - Minimizes load-induced error in high-gain op-amp feedback networks |
| Min Operating Current | 8 µA - Supports operation from microamp-level current sources like LM334 in remote sensors |
| Noise (10 Hz–10 kHz) | 60 µV - Low enough for 12-bit precision measurements without additional filtering |
| Long-Term Drift | 20 ppm/khr - Predictable aging behavior for >10-year embedded system deployments |
Pinout & Package
LT1004CDR-1-2 is housed in an 8-pin SOIC (D package) with two active terminals and six no-connect (NC) pins. Terminals 6 and 8 are internally connected to cathode; pin 4 is anode and pin 5 is cathode. This layout supports standard PCB footprint reuse while isolating unused pins to reduce parasitic coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 4 | Anode | Main current entry point; connects to system ground or low-side current source |
| Pin 5 | Cathode | Voltage reference output node; sinks all operating current and defines 1.235 V potential |
| Pins 1,2,3,6,7,8 | No internal connection | Electrically isolated; may be left floating or tied to ground for mechanical stability only |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal shunt topology | Eliminates need for dedicated reference voltage supply rail; simplifies biasing in single-supply systems |
| Micropower operation (8 µA min) | Enables multi-year battery life in wireless sensor nodes using coin-cell or lithium primary cells |
| Pin-for-pin replacement for LM285/LM385 | Allows drop-in upgrade of legacy designs without PCB revision or firmware changes |
| Low 60 µV broadband noise | Supports high-resolution data acquisition without external low-noise amplification stages |
| Stable 0.6 Ω dynamic impedance | Maintains regulation accuracy even under varying load conditions in programmable current sources |
Applications
| Portable Meter Reference | Portable Test Instruments |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 1.2 V reference for 3½-digit ADC conversion. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation voltage for internal scaling resistors and ADC reference input. Use Value: ±4 mV initial accuracy and 20 ppm/°C drift ensure measurement repeatability across temperature without recalibration. | Use Scenario: Battery-powered oscilloscope probe calibration circuit verifying DC offset accuracy. IC Role / Device Role / Timing Role: Precision bias source for op-amp nulling and offset compensation networks. Use Value: 0.6 Ω reference impedance prevents loading errors when driving high-input-impedance comparator inputs. |
| Battery-Operated Systems | Current-Loop Instrumentation |
Use Scenario: Remote environmental sensor node powered by CR2032 coin cell with 10-year target lifetime. IC Role / Device Role / Timing Role: Reference element in ultra-low-power LDO feedback divider and ADC reference path. Use Value: 8 µA minimum operating current enables continuous monitoring with sub-10 µA system quiescent draw. | Use Scenario: 4–20 mA transmitter converting RTD temperature readings for industrial PLC interfaces. IC Role / Device Role / Timing Role: Stable voltage reference for current-sense amplifier gain setting and loop power regulation. Use Value: 20 ppm/°C tempco ensures <±0.1% full-scale error over −20°C to +60°C field operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BD-1.2 | ±1% initial accuracy (12 mV), 100 ppm/°C tempco, higher 2 Ω impedance | Limited to cost-sensitive, non-precision applications; requires external trimming for <0.5% accuracy | Select when budget constraints outweigh stability requirements and board space allows for trim pot |
| REF101CP | ±0.1% initial accuracy, 5 ppm/°C tempco, but 100 µA min operating current | Higher power consumption limits use in sub-100 µA battery systems; superior long-term stability | Choose for lab-grade instrumentation where 5 ppm/°C drift justifies 12× higher quiescent current |
Compared with LM385BD-1.2 and REF101CP, the LT1004CDR-1-2 uniquely balances micropower operation (8 µA min), tight initial tolerance (±4 mV), and moderate tempco (20 ppm/°C) - making it optimal for portable, battery-constrained systems needing calibrated accuracy without trimming or external support circuitry.
Availability
LT1004CDR-1-2 is available at Aetrix Electronics and suitable for portable meter reference, battery-operated systems, and current-loop instrumentation requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LT1004CDR-1-2 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 analog IC design and manufacturing.
The LT1004 series was developed to deliver high-accuracy voltage references at micropower levels for portable and battery-powered instrumentation - addressing the trade-off between precision and energy efficiency in field-deployable measurement systems.
FAQ
What is the operating temperature range for the LT1004CDR-1-2?
The LT1004CDR-1-2 is characterized for operation from 0°C to 70°C. This commercial-grade temperature range aligns with its "C" suffix designation and supports use in indoor portable equipment, handheld test tools, and consumer-grade instrumentation where ambient conditions remain within this envelope. The device maintains specified initial accuracy and temperature coefficient across this full range.
Can the LT1004CDR-1-2 replace LM285 or LM385 devices directly?
Yes, the LT1004CDR-1-2 is explicitly designed as a pin-for-pin replacement for the LM285 and LM385 series voltage references. It uses identical SOIC-8 packaging with matching anode/cathode terminal locations and offers improved specifications - including tighter initial accuracy (±4 mV vs ±20 mV), lower temperature coefficient (20 ppm/°C vs 100 ppm/°C), and reduced reference impedance - without requiring PCB or schematic modifications.
What is the minimum cathode current required for stable regulation of the LT1004CDR-1-2?
The LT1004CDR-1-2 requires a minimum cathode current of 8 µA to maintain regulation within specifications. Below this threshold, output voltage deviates from nominal 1.235 V, and temperature stability degrades. In practice, designs typically operate above 100 µA to ensure robust performance across process and temperature variations - as confirmed in the electrical characteristics table at IZ = 100 µA.
How does the LT1004CDR-1-2 achieve low noise performance despite micropower operation?
The LT1004CDR-1-2 achieves 60 µV broadband noise (10 Hz–10 kHz) through optimized band-gap core design and internal filtering, not external components. Its monolithic structure minimizes parasitic coupling, and the 20 pF internal capacitance shown in the schematic contributes to inherent high-frequency suppression. This allows clean reference generation in sensitive analog front-ends without adding discrete RC filters that would increase board area and power loss.
Is the LT1004CDR-1-2 RoHS compliant and lead-free?
Yes, the LT1004CDR-1-2 is RoHS compliant and lead-free. Per TI's Package Option Addendum, it carries a "Green (RoHS & no Sb/Br)" eco plan with NIPDAU lead finish and meets JEDEC MSL Level-1 moisture sensitivity classification. The device marking "4C-12" and reel packaging (2500 units per reel) confirm full compliance with EU RoHS Directive 2011/65/EU and associated substance restrictions.
LT1004CDR-1-2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.32%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LT1004CDR-1-2 FAQ
1.How can I place an order for LT1004CDR-1-2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004CDR-1-2 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 LT1004CDR-1-2 reliable?
The price and inventory of LT1004CDR-1-2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1004CDR-1-2 is usually 5 days.
3.What payment methods are accepted for LT1004CDR-1-2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004CDR-1-2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004CDR-1-2?
LT1004CDR-1-2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004CDR-1-2 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 LT1004CDR-1-2?
For technical support, including LT1004CDR-1-2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004CDR-1-2 requirements.
6.How does Aetrix verify that LT1004CDR-1-2 is sourced from the original manufacturer or authorized distributors?
All LT1004CDR-1-2 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 LT1004CDR-1-2 meets industry standards.
7.What is the process for return or replacement of LT1004CDR-1-2?
All LT1004CDR-1-2 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004CDR-1-2, 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 LT1004CDR-1-2 part is unused and in its original packaging.
Return procedure for LT1004CDR-1-2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LT1004CDR-1-2 Tags
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TL431AIDBZR
Texas Instruments
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TL431BQDBZR
Texas Instruments
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AN431AN-ATRG1
Diodes Incorporated
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LM4040CYM3-2.5-TR
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LM4040CYM3-4.1-TR
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LM4040EIM3-2.5/NOPB
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AZ431LBNTR-G1
Diodes Incorporated
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LM4040D20IDBZR
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LM4041DIM3-ADJ/NOPB
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LM4040DIM3X-2.5/NOPB
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LM4040DIM3-2.5/NOPB
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AZ431LANTR-G1
Diodes Incorporated
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