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Texas Instruments LM385DRG4-2-5
- Part No.:
- LM385DRG4-2-5
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385DRG4-2-5.pdf
- Description:
- IC VREF SHUNT 3% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,724
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Product details
Overview
LM385DRG4-2-5 from Texas Instruments is a micropower, two-terminal, band-gap shunt voltage reference delivering a precise 2.5 V output with ±3% initial tolerance, 1.5 Ω maximum reference impedance over full temperature range, and operation from 20 μA to 20 mA cathode current. It serves as a stable reference in portable test instruments, battery-operated systems, and current-loop instrumentation where low power and capacitive-load tolerance are critical.
For engineers reviewing the LM385DRG4-2-5 datasheet, LM385DRG4-2-5 pinout, LM385DRG4-2-5 application, or LM385DRG4-2-5 equivalent, key selection criteria include its 2.5 V nominal output, SOIC-8 package, 0°C to 70°C operating range, 20 μA minimum cathode current, and compatibility with floating or negative-regulation topologies.
Technical Context
The LM385DRG4-2-5 implements a band-gap reference core driving a high-gain amplifier and shunt pass element to maintain regulation between cathode and anode. Internal frequency compensation ensures stability with all capacitive loads, eliminating need for external compensation.
It operates exclusively in shunt mode: cathode accepts current input (20 μA–20 mA), anode connects to ground or system common, and voltage develops across the device. No adjustment or external feedback is supported-output is fixed at 2.5 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal, 2.425 V to 2.575 V (±3% initial tolerance) at 25°C |
| Operating Current Range | 20 μA to 20 mA cathode current - enables ultra-low-power and high-current reference use |
| Reference Impedance | ≤1.5 Ω over full temperature range - ensures minimal output voltage shift under load transients |
| Tempco | ±20 ppm/°C average - supports stable performance across 0°C to 70°C industrial range |
| Long-Term Drift | ±20 ppm/khr at 100 μA - guarantees predictable aging behavior in long-life battery systems |
| Noise (10 Hz–10 kHz) | 120 µV broadband - suitable for precision analog signal conditioning without added filtering |
| Min Cathode Current | 8 μA to 20 μA (full temp range) - defines lowest usable bias for regulation startup |
Pinout & Package
LM385DRG4-2-5 uses an 8-pin SOIC (D) package (4.90 mm × 3.90 mm body), with only two functional terminals: Cathode (Pin 8) and Anode (Pin 4). Pins 1, 2, 3, 5, 6, and 7 are no-connect (NC) and must remain unconnected in PCB layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CATHODE (Pin 8) | Shunt Current/Voltage Input | Current sink node - voltage develops across device when current is sourced into this pin |
| ANODE (Pin 4) | Common Pin | Typically connected to ground or system return - establishes reference potential for output |
| Pins 1,2,3,5,6,7 | No Internal Connection | Must be left floating - no electrical function or thermal benefit from connection |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive-load immunity | Stable with any value of cathode bypass capacitance - eliminates need for output capacitor design iteration |
| Floating shunt architecture | Enables both positive- and negative-regulation configurations - supports rail-to-rail reference placement |
| Micropower operation | 20 μA minimum operating current - extends battery life in portable meters to near shelf-life duration |
| On-chip trimmed accuracy | ±3% initial tolerance without external calibration - reduces BOM count and production test time |
| Low dynamic impedance | ≤1.5 Ω over 0°C–70°C - maintains <1 mV output shift under 1 mA load step |
Applications
| Portable Test Instruments | Battery-Operated Systems |
|---|---|
Use Scenario: Handheld multimeters and calibrators requiring stable, low-drift reference for ADC front-end scaling. IC Role / Device Role / Timing Role: Shunt voltage reference providing 2.5 V reference for 16-bit SAR ADCs and precision op-amp gain-setting networks. Use Value: 120 µV broadband noise and ±20 ppm/°C tempco enable ≤0.01% measurement accuracy across operating temperature. | Use Scenario: Remote sensor nodes powered by coin-cell batteries with multi-year operational lifetime requirements. IC Role / Device Role / Timing Role: Micropower reference for low-power microcontroller ADCs and voltage-monitoring comparators. Use Value: 20 μA minimum cathode current allows direct bias from high-value resistors, reducing quiescent current to sub-μA system levels. |
| Current-Loop Instrumentation | Panel Meters |
Use Scenario: 4–20 mA transmitter circuits where reference stability directly impacts loop accuracy and calibration drift. IC Role / Device Role / Timing Role: Precision shunt reference for DAC output scaling and current-sense amplifier offset correction. Use Value: ≤1.5 Ω reference impedance prevents output voltage sag during 20 mA loop compliance transitions. | Use Scenario: Industrial panel meters using LED or LCD displays with integrated analog front-ends. IC Role / Device Role / Timing Role: Fixed 2.5 V reference for analog-to-digital conversion of scaled process signals (e.g., 0–10 V inputs). Use Value: ±3% initial tolerance and ±20 ppm/khr long-term drift ensure field calibration intervals exceed 2 years. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385LP-2-5 | TO-92 package, same 2.5 V output and ±3% tolerance, but rated for 0°C–70°C and uses 3-pin through-hole mounting | Preferred for prototyping, low-volume assembly, or space-constrained boards where SOIC footprint is unavailable | Select LM385LP-2-5 when manual soldering, thermal mass requirements, or legacy board layouts favor through-hole packaging |
| TLVH431IDBVR | Adjustable shunt reference (2.5 V min), higher 80 μA typical cathode current, lower 0.2 Ω typical impedance, but requires external resistor network for 2.5 V setting | Suitable for designs needing programmability or tighter impedance, but adds component count and layout complexity | Choose TLVH431IDBVR only if adjustable output or sub-1 Ω impedance justifies added design overhead and calibration effort |
Compared with LM385LP-2-5, LM385DRG4-2-5 offers surface-mount scalability and automated assembly compatibility; compared with TLVH431IDBVR, it delivers plug-and-play 2.5 V accuracy without external components-critical for cost-sensitive, high-volume portable instrumentation.
Availability
LM385DRG4-2-5 is available at Aetrix Electronics and suitable for portable test instruments, battery-operated systems, and current-loop instrumentation requiring stable component supply with consistent parametric performance and long-term availability.
Supply support for LM385DRG4-2-5 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade reference solutions.
The LM385 series was designed specifically for micropower, two-terminal shunt voltage reference applications in portable, battery-constrained, and industrial instrumentation systems where simplicity, stability, and low quiescent current are essential.
FAQ
What is the operating temperature range for LM385DRG4-2-5?
The LM385DRG4-2-5 is specified for operation from 0°C to 70°C ambient temperature. This industrial-grade range aligns with its intended use in portable test equipment and battery-powered instrumentation where extended cold-temperature operation is not required. The device's ±20 ppm/°C temperature coefficient ensures stable 2.5 V output across this full range.
Can LM385DRG4-2-5 be used in a negative-reference configuration?
Yes, LM385DRG4-2-5 supports floating shunt operation and can be configured as a negative reference by connecting its anode to a positive rail and sinking current from its cathode to ground. This topology enables generation of stable –2.5 V references in dual-supply systems without additional active components, leveraging its inherent bidirectional current capability.
What is the minimum cathode current required for regulation in LM385DRG4-2-5?
The LM385DRG4-2-5 requires a minimum cathode current of 8 μA to 20 μA across its full 0°C to 70°C operating range to maintain regulation. At 25°C, regulation begins reliably at 20 μA. Designers must ensure the bias network delivers at least 20 μA under worst-case conditions-including lowest supply voltage and highest temperature-to guarantee stable 2.5 V output.
How does LM385DRG4-2-5 handle capacitive loading on its cathode pin?
The LM385DRG4-2-5 features internal frequency compensation that ensures unconditional stability with any value of capacitive load on the cathode pin. Unlike many shunt references, it does not require a minimum or maximum external capacitor-designers may add a 0.1 µF ceramic bypass capacitor for noise reduction or omit it entirely without risk of oscillation or regulation loss.
Is LM385DRG4-2-5 pin-compatible with other members of the LMx85 family?
LM385DRG4-2-5 shares the same SOIC-8 pinout (with Cathode on Pin 8 and Anode on Pin 4) as LM285D-2-5 and LM385BD-2-5, but differs in temperature rating and initial tolerance. While physically interchangeable, substitution requires verification of operating temperature range (0°C–70°C vs –40°C–85°C) and tolerance (±3% vs ±1.5%) to avoid system-level performance deviations.
LM385DRG4-2-5 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:
- ±3%
- 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
LM385DRG4-2-5 FAQ
1.How can I place an order for LM385DRG4-2-5 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385DRG4-2-5 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 LM385DRG4-2-5 reliable?
The price and inventory of LM385DRG4-2-5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM385DRG4-2-5 is usually 5 days.
3.What payment methods are accepted for LM385DRG4-2-5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385DRG4-2-5 transactions.
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4.How is shipping managed for LM385DRG4-2-5?
LM385DRG4-2-5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385DRG4-2-5 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 LM385DRG4-2-5?
For technical support, including LM385DRG4-2-5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385DRG4-2-5 requirements.
6.How does Aetrix verify that LM385DRG4-2-5 is sourced from the original manufacturer or authorized distributors?
All LM385DRG4-2-5 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 LM385DRG4-2-5 meets industry standards.
7.What is the process for return or replacement of LM385DRG4-2-5?
All LM385DRG4-2-5 units undergo pre-shipment inspection (PSI). If there is an issue with LM385DRG4-2-5, 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 LM385DRG4-2-5 part is unused and in its original packaging.
Return procedure for LM385DRG4-2-5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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