LM385DRG4-1-2 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
Texas Instruments LM385DRG4-1-2 is a two-terminal precision voltage reference with a 1.235 V nominal output, 1.21 V to 1.26 V output range, and up to 20 mA operating current in an 8-pin SOIC package. It functions as a micropower bandgap shunt reference for stable biasing and ADC reference applications. Available in tape-and-reel format, JESD-609 e4 compliant, for automated surface-mount assembly.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- OBSOLETE
- Datasheet
- LM385DRG4-1-2 Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- ?°C to 70.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of LM385DRG4-1-2?
- 1.235 V precision bandgap output with ±25 mV tolerance for accurate ADC reference and biasing circuits
- Two-terminal shunt configuration allows use as a simple zener-style reference with minimal external components
- Up to 20 mA operating current range supports flexible biasing across a wide supply voltage span
- 8-pin SOIC package in tape-and-reel format enables automated pick-and-place assembly in high-volume production
What is LM385DRG4-1-2 used for?
The LM385DRG4-1-2 serves as a low-cost precision voltage reference in ADC circuits, battery-powered sensor modules, and analog signal conditioning designs that require a stable 1.235 V bias point independent of supply fluctuations. Its two-terminal shunt topology makes it a direct drop-in replacement for a zener diode with tighter initial accuracy in comparator threshold-setting and op-amp offset calibration applications. The device also suits portable medical instruments and data loggers that need a micropower reference consuming minimal quiescent current.
What are the specifications of LM385DRG4-1-2?
| YTEOL | 0 |
| Analog IC - Other Type | TWO TERMINAL VOLTAGE REFERENCE |
| JESD-30 Code | R-PDSO-G8 |
| JESD-609 Code | e4 |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Output Voltage-Max | 1.26V |
| Output Voltage-Min | 1.21V |
| Output Voltage-Nom | 1.235V |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | SOP8,.25 |
| Package Shape | RECTANGULAR |
| Package Style | SMALL OUTLINE |
| Peak Reflow Temperature (Cel) | 260 |
| Qualification Status | Not Qualified |
| Surface Mount | YES |
| Technology | BIPOLAR |
| Temp Coef of Voltage-Max | 20ppm/°C |
| Temperature Grade | COMMERCIAL |
| Terminal Finish | NICKEL PALLADIUM GOLD |
| Terminal Form | GULL WING |
| Terminal Pitch | 1.27mm |
| Terminal Position | DUAL |
| Time@Peak Reflow Temperature-Max (s) | 30 |
| Trim/Adjustable Output | NO |
| Voltage Tolerance-Max | 2% |
| Package | Small Outline Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Where can I find the LM385DRG4-1-2 datasheet?
LM385DRG4-1-2 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for LM385DRG4-1-2?
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
How accurate is the 1.235 V output of the LM385DRG4-1-2 and what factors affect its precision?
The LM385DRG4-1-2 provides a nominal 1.235 V output with a specified range of 1.21 V to 1.26 V, giving an initial accuracy of approximately ±2%. Temperature coefficient and operating current both influence the final voltage; running the device near its typical bias point of 1 mA minimizes drift. For tighter accuracy, a grade-selected or trimmed reference such as the LM4040 at ±0.1% may be more appropriate.
What operating current range can the LM385DRG4-1-2 handle and how is the bias resistor calculated?
The LM385DRG4-1-2 operates from a minimum current of approximately 20 µA up to 20 mA, giving a 1000:1 dynamic range. The series bias resistor is calculated as R = (VSupply - 1.235 V) / IBias; for a 5 V supply with 1 mA bias, R equals approximately 3.76 kΩ. Choosing a standard 3.9 kΩ resistor keeps current within the recommended range while maintaining the ±25 mV output tolerance.
In what scenarios does the LM385DRG4-1-2 outperform a standard zener diode as a voltage reference?
Unlike a zener diode whose voltage shifts significantly with temperature and current, the LM385DRG4-1-2 uses a bandgap circuit to maintain its 1.235 V reference within ±25 mV over its operating range. At low bias currents where zener dynamic impedance increases voltage variability by tens of millivolts, the LM385 remains stable. This makes it preferable in precision comparator thresholds, ADC references, and op-amp input biasing where supply-independent accuracy below 50 mV error is required.
Is the LM385DRG4-1-2 suitable for a 3.3 V single-supply ADC reference in a battery-powered sensor?
Yes, the LM385DRG4-1-2 works well with a 3.3 V supply, requiring only a series resistor of approximately 2.06 kΩ for a 1 mA bias current to maintain the 1.235 V output. This 1.235 V reference is within the allowable reference voltage range for many 10-bit and 12-bit ADCs that accept references below VDD, enabling accurate analog-to-digital conversion in battery-powered sensors, wearables, and IoT nodes operating from 3.3 V lithium or alkaline cells.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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