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Texas Instruments LT1004CDRG4-2-5
- Part No.:
- LT1004CDRG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1004CDRG4-2-5.pdf
- Description:
- IC VREF SHUNT 0.8% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,447
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Product details
Overview
LT1004CDRG4-2-5 from Texas Instruments is a two-terminal micropower band-gap voltage reference IC delivering 2.5 V nominal output with ±20 mV initial accuracy, 20 ppm/°C temperature coefficient, and 0.2 Ω typical reference impedance at 100 µA. It operates from 8 µA to 20 mA supply current and supports portable meter reference, battery-operated systems, and current-loop instrumentation.
For engineers reviewing the LT1004CDRG4-2-5 datasheet, LT1004CDRG4-2-5 pinout, LT1004CDRG4-2-5 application, or LT1004CDRG4-2-5 equivalent, key selection criteria include low-quiescent-current stability, SOIC-8 package compatibility, 0°C to 70°C operating range, and direct replacement capability for LM285/LM385-2.5 references in precision analog signal chains.
Technical Context
The LT1004CDRG4-2-5 implements a monolithic band-gap reference architecture with internal trimming to achieve tight initial voltage tolerance and low thermal drift. Its two-terminal configuration simplifies PCB layout by eliminating separate ground or input pins, and its low 0.2 Ω dynamic impedance ensures stable regulation under varying load currents.
Designed for micropower operation, the device maintains specified performance down to 8 µA minimum reference current and exhibits broadband noise of 60–120 µV (10 Hz–10 kHz) at 100 µA bias. It is characterized across 0°C to 70°C and qualified per TI's standard reliability testing for industrial-grade applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal; ±20 mV initial accuracy ensures ≤0.8% absolute error at 25°C without external trimming. |
| Temp Coefficient | 20 ppm/°C average; guarantees ≤±0.5 mV drift over full 0°C–70°C range for stable ADC/DAC biasing. |
| Ref Impedance | 0.2 Ω typical at 100 µA; enables <1 mV output shift under 1 mA load transients in precision sensor interfaces. |
| Min Operating Current | 8 µA; allows use in ultra-low-power wake-up circuits and energy-harvesting systems. |
| Max Operating Current | 20 mA; supports high-current buffer stages without derating or thermal shutdown. |
| Noise (10 Hz–10 kHz) | 60–120 µV RMS; meets requirements for 12-bit+ data acquisition where reference noise dominates system ENOB. |
| Long-Term Drift | 20 ppm/khr; predicts <0.2% voltage shift over 10 years in sealed industrial environments. |
Pinout & Package
LT1004CDRG4-2-5 uses an 8-pin SOIC (D) package with two active terminals (Anode and Cathode) and six no-connect (NC) pins. Terminals 6 and 8 are internally connected to Cathode; pins 1, 2, 3, 4, and 7 are unconnected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 4) | Reference output terminal | Provides 2.5 V regulated voltage; must be decoupled with ≥0.1 µF ceramic capacitor for stability. |
| Cathode (Pins 5 & 6 & 8) | Reference return path | Common connection point for load return and bias current sink; requires low-impedance PCB trace to minimize ground bounce. |
| Pins 1, 2, 3, 7 | No internal connection | Unused; may be left floating or tied to ground for mechanical reinforcement-no electrical impact. |
Key Features
| Feature | Design Value |
|---|---|
| Two-terminal operation | Eliminates need for dedicated ground or input pins-reduces BOM count and routing complexity in space-constrained designs. |
| Pin-for-pin replacement for LM285/LM385-2.5 | Enables drop-in upgrade with improved accuracy (±20 mV vs ±50 mV), lower tempco (20 ppm/°C vs 100 ppm/°C), and lower impedance (0.2 Ω vs 1.5 Ω). |
| Micropower startup | Functions reliably at 8 µA minimum current-supports always-on monitoring circuits powered by coin cells or energy harvesters. |
| Low broadband noise | 60–120 µV RMS (10 Hz–10 kHz) enables high-resolution measurements in portable test equipment without external filtering. |
| SOIC-8 packaging | Standard 150-mil body with 1.27 mm pitch-compatible with automated assembly and legacy reflow profiles (MSL Level-1). |
Applications
| Portable Meter Reference | Current-Loop Instrumentation |
|---|---|
Use Scenario: Handheld multimeter requiring stable 2.5 V reference for 16-bit SAR ADC conversion. IC Role / Device Role / Timing Role: Two-terminal voltage reference providing excitation and scaling for analog front-end and ADC reference input. Use Value: ±20 mV initial accuracy and 20 ppm/°C tempco ensure <0.1% measurement error across 0°C–40°C handheld operating range without calibration. | Use Scenario: 4–20 mA transmitter in industrial process control loop with isolated power and signal paths. IC Role / Device Role / Timing Role: Precision 2.5 V reference for DAC output scaling and current-sense amplifier biasing in loop-powered design. Use Value: 0.2 Ω reference impedance minimizes output voltage shift during 4–20 mA load variations, maintaining loop accuracy within ±0.05% FSR. |
| Battery-Operated Systems | Portable Test Instruments |
Use Scenario: Wireless sensor node powered by single 3.6 V Li-SOCl₂ cell with 10-year shelf life requirement. IC Role / Device Role / Timing Role: Micropower voltage reference for ultra-low-duty-cycle microcontroller ADC and RTC backup supply. Use Value: 8 µA minimum operating current enables continuous reference availability while consuming <0.07 µW-extending battery life beyond 10 years. | Use Scenario: Portable oscilloscope probe calibration module requiring traceable 2.5 V reference at field service locations. IC Role / Device Role / Timing Role: Primary reference source for self-test and gain calibration routines executed on boot. Use Value: 20 ppm/khr long-term drift ensures calibration validity for ≥12 months between lab recalibrations, reducing maintenance overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BD-2.5 | ±30 mV initial accuracy, 100 ppm/°C tempco, 1.5 Ω reference impedance, 10 µA min current | Higher drift and impedance limit use in >12-bit systems or wide-temperature deployments | Select when cost sensitivity outweighs precision requirements and existing LM385 footprint reuse is mandatory |
| REF3025AIDBZR | ±12 mV initial accuracy, 50 ppm/°C tempco, 0.1 Ω impedance, 50 µA min current, SOT-23-3 package | Lower accuracy than LT1004CDRG4-2-5 but superior tempco; requires different PCB layout and higher quiescent current | Select for space-constrained designs needing tighter initial tolerance, accepting higher minimum current and smaller package |
Compared with LM385BD-2.5, LT1004CDRG4-2-5 delivers 1.5× better initial accuracy and 5× lower tempco-critical for portable instruments. Versus REF3025AIDBZR, it offers lower minimum current (8 µA vs 50 µA) and SOIC-8 compatibility but trades 12 mV vs 20 mV initial tolerance-favoring LT1004CDRG4-2-5 in battery-limited, footprint-sensitive upgrades.
Availability
LT1004CDRG4-2-5 is available at Aetrix Electronics and suitable for portable meter reference, current-loop instrumentation, and battery-operated systems requiring stable component supply, long-term calibration integrity, and industrial temperature range support.
Supply support for LT1004CDRG4-2-5 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, embedded processing, and digital signal technologies with over 90 years of innovation in precision analog components.
The LT1004 series was designed specifically for micropower, two-terminal voltage reference applications in portable, battery-constrained, and industrial instrumentation systems-emphasizing low drift, low noise, and seamless LM285/LM385 drop-in replacement.
FAQ
What is the operating temperature range for LT1004CDRG4-2-5?
The LT1004CDRG4-2-5 is characterized for operation from 0°C to 70°C. This commercial-grade temperature range is confirmed in TI's SLVS022M datasheet and Package Option Addendum, and applies to all SOIC-packaged C-grade variants including LT1004CDRG4-2-5. Operation outside this range is not guaranteed and may result in degraded accuracy or increased drift.
Is LT1004CDRG4-2-5 pin-compatible with LM385-2.5?
Yes, LT1004CDRG4-2-5 is explicitly documented as a pin-for-pin replacement for the LM385 series. Both devices use identical SOIC-8 footprints with Anode on Pin 4 and Cathode on Pin 5, and share the same NC pin assignments. The LT1004CDRG4-2-5 improves upon LM385-2.5 with tighter initial accuracy (±20 mV vs ±30–50 mV) and lower temperature coefficient (20 ppm/°C vs 100 ppm/°C).
What is the minimum reference current required for LT1004CDRG4-2-5 to regulate properly?
The LT1004CDRG4-2-5 requires a minimum reference current of 8 µA to maintain regulation, as specified in the "Electrical Characteristics" table of the SLVS022M datasheet. Below this threshold, output voltage deviates significantly from 2.5 V. For stable operation across temperature, design for ≥10 µA minimum bias-achievable with a 240 kΩ pull-up resistor from 2.5 V output to a 4.5 V supply.
Can LT1004CDRG4-2-5 be used in a shunt configuration with an op-amp buffer?
Yes, LT1004CDRG4-2-5 is a two-terminal shunt reference and is routinely used with op-amp buffers (e.g., TLC271, TLE2022) to provide low-impedance, high-current 2.5 V supplies. Figure 18 and Figure 22 in the SLVS022M datasheet show validated configurations. Ensure the op-amp's input common-mode range includes the 2.5 V reference voltage and that feedback resistors are ≥1% tolerance to preserve accuracy.
Does LT1004CDRG4-2-5 require external capacitors for stability?
LT1004CDRG4-2-5 does not require external capacitors for basic regulation, but a 0.1 µF ceramic capacitor placed directly across Anode and Cathode (Pin 4 to Pin 5) is strongly recommended to suppress high-frequency noise and improve transient response-especially in noisy environments or when driving capacitive loads. This practice is illustrated in Figures 19 and 20 of the SLVS022M datasheet.
LT1004CDRG4-2-5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±0.8%
- Temperature Coefficient:
- 20ppm/°C Typical
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 120µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LT1004CDRG4-2-5 FAQ
1.How can I place an order for LT1004CDRG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1004CDRG4-2-5 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 LT1004CDRG4-2-5 reliable?
The price and inventory of LT1004CDRG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1004CDRG4-2-5 is usually 5 days.
3.What payment methods are accepted for LT1004CDRG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1004CDRG4-2-5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1004CDRG4-2-5?
LT1004CDRG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1004CDRG4-2-5 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 LT1004CDRG4-2-5?
For technical support, including LT1004CDRG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1004CDRG4-2-5 requirements.
6.How does Aetrix verify that LT1004CDRG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LT1004CDRG4-2-5 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 LT1004CDRG4-2-5 meets industry standards.
7.What is the process for return or replacement of LT1004CDRG4-2-5?
All LT1004CDRG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LT1004CDRG4-2-5, 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 LT1004CDRG4-2-5 part is unused and in its original packaging.
Return procedure for LT1004CDRG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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