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Texas Instruments LM185-2.5 MD8
- Part No.:
- LM185-2.5 MD8
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- Die
- Datasheet:
-
LM185-2.5 MD8.pdf
- Description:
- IC VREF SHUNT 2.5V DIE
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
LM185-2.5 MD8 from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering a precise 2.5 V output with ±0.76 V initial tolerance (2.425 V to 2.575 V at 30 µA), 0.6 Ω dynamic impedance (A grade), and 50 ppm/°C temperature coefficient across −55°C to +125°C. It operates over a 20 µA to 20 mA current range and enables ultra-low-power analog circuitry such as portable meters and battery-powered regulators.
For engineers reviewing the LM185-2.5 MD8 datasheet, LM185-2.5 MD8 pinout, LM185-2.5 MD8 application, or LM185-2.5 MD8 equivalent, key selection criteria include its micropower operation down to 20 µA, tight voltage tolerance at low currents, capacitive loading tolerance, and qualification for extended temperature industrial/military environments.
Technical Context
The LM185-2.5 MD8 implements a band-gap reference architecture using only transistors and resistors-no junctions requiring high-current bias-enabling low noise, excellent long-term stability, and minimal drift under varying load conditions. Its on-chip trimming ensures tight initial voltage accuracy without external calibration.
Designed for robustness in harsh environments, it supports full military-grade operating temperature (−55°C to +125°C), withstands 4000 V HBM ESD, and tolerates wide capacitive loading without oscillation-eliminating need for external compensation in most reference applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal; 2.425–2.575 V at 30 µA ensures precision in low-current sensing and calibration circuits. |
| Operating Current Range | 20 µA to 20 mA; supports micropower systems (e.g., battery life near shelf life) and higher-current regulator feedback paths. |
| Dynamic Impedance | 0.6 Ω (A grade); maintains stable output under fast load transients, critical for ADC reference and DAC biasing. |
| Temp Coefficient | 50 ppm/°C max; guarantees ≤±1.25 mV drift over full −55°C to +125°C range for thermally demanding instrumentation. |
| Initial Tolerance | ±0.76 V (±3.04%) at 30 µA; tighter than standard Zener diodes, enabling direct replacement in legacy 2.5 V reference designs. |
| ESD Rating | 4000 V HBM; allows safe handling in non-ESD-controlled assembly lines without additional protection circuitry. |
| Max Reverse Current | 30 mA absolute maximum; defines safe operating margin when used with series resistor in unregulated supplies. |
Pinout & Package
DIESALE (Y) package - bare die form, intended for hybrid microcircuit integration or custom substrate mounting. No leadframe or molded body; electrical connections made via bond pads. Not suitable for through-hole or SMT reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Anode (reverse-biased terminal) | Connected to system ground or low-impedance return; sets reference node polarity for 2.5 V output at cathode. |
| V− | Cathode (output terminal) | Delivers regulated 2.5 V when reverse-biased; must be decoupled locally for noise-sensitive applications. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Functional down to 20 µA supply current-enables multi-year battery life in portable data loggers and remote sensors. |
| Capacitive loading immunity | No instability with ≥1 µF output capacitance-simplifies layout in noisy environments without RC snubbers or isolation resistors. |
| Tight voltage tolerance | ±3.04% at 30 µA-reduces need for post-assembly trimming in production test, lowering manufacturing cost. |
| Wide temperature range | Specified from −55°C to +125°C-qualified for aerospace, downhole, and automotive under-hood applications. |
| Low dynamic impedance | 0.6 Ω ensures <1 mV output shift under 1 mA load step-critical for high-resolution 16-bit+ SAR ADC references. |
Applications
| Portable Precision Meters | Micropower Battery Regulators |
|---|---|
|
Use Scenario: Handheld multimeters and pH meters powered by single 9 V alkaline cells requiring stable 2.5 V reference for ADC conversion. IC Role / Device Role / Timing Role: 2-terminal shunt reference providing ratiometric accuracy independent of supply decay. Use Value: Enables >10-year shelf-life-equivalent runtime with 20 µA quiescent draw and maintains ±0.05% measurement linearity over battery discharge. |
Use Scenario: Low-quiescent LDO feedback network where reference current must not degrade efficiency in energy-harvesting systems. IC Role / Device Role / Timing Role: Shunt reference setting output voltage of adjustable regulators (e.g., LM317) with minimal current overhead. Use Value: Reduces total no-load current to ~25 µA vs. 100+ µA for TL431-based solutions-extending usable battery capacity by 3×. |
| Thermocouple Cold-Junction Compensation | Industrial Sensor Signal Conditioning |
|
Use Scenario: Embedded temperature transmitters using Type K/J thermocouples requiring accurate 0°C offset correction at sensor interface. IC Role / Device Role / Timing Role: Precision 2.5 V reference driving current sources that generate Kelvin-proportional bias for cold-junction ICs. Use Value: Achieves ±0.5°C system accuracy over −40°C to +85°C ambient due to 50 ppm/°C TC and low drift (<±10 mV over life). |
Use Scenario: 4–20 mA loop-powered transmitters with onboard analog front-ends needing rail-to-rail stable reference under varying loop voltage (12–36 V). IC Role / Device Role / Timing Role: Shunt reference establishing excitation voltage for RTD bridges and gain-setting for instrumentation amplifiers. Use Value: Maintains <0.1% reference error across full loop voltage range and temperature, eliminating calibration drift in field-deployed units. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385B-2.5/NOPB | Commercial-grade (0°C to +70°C), 1% initial tolerance, 10 Ω dynamic impedance, no MIL-STD screening. | Limited to benign-environment consumer/industrial use; unsuitable for extended temperature or high-reliability programs. | Select when cost sensitivity outweighs temperature range and long-term stability requirements. |
| REF5025IDR | 3-pin series reference, 0.05 ppm/°C TC, 3 µVpp noise, 10 mA max load, SOIC-8 package. | Requires external bypass and biasing; superior for high-precision data acquisition but incompatible pinout and topology. | Choose for lab-grade instrumentation where ultra-low noise and drift dominate; not a drop-in replacement. |
Compared with LM385B-2.5/NOPB, LM185-2.5 MD8 delivers 16× lower dynamic impedance and −55°C capability; versus REF5025IDR, it offers 2-terminal simplicity and die-level integration but trades off noise performance and TC by >100×.
Availability
LM185-2.5 MD8 is available at Aetrix Electronics and suitable for portable instrumentation, aerospace telemetry modules, and industrial sensor transmitters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM185-2.5 MD8 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 high-reliability components, with decades of heritage in precision analog design and space/military qualification.
The LM185 family was engineered specifically for micropower, high-stability voltage referencing in resource-constrained and mission-critical systems-prioritizing low current, wide temperature operation, and long-term reliability over feature count or digital interfaces.
FAQ
What is the operating current range for LM185-2.5 MD8?
The LM185-2.5 MD8 operates reliably from 20 µA to 20 mA reverse current. This wide range allows it to serve both ultra-low-power applications-such as battery-powered sensors drawing sub-µA standby current-and higher-current feedback loops in linear regulators. At 20 µA, the device maintains regulation within specification, making LM185-2.5 MD8 ideal for energy-constrained designs where every nanoamp counts.
Is LM185-2.5 MD8 pin-compatible with standard TO-92 or SOT-23 voltage references?
No-LM185-2.5 MD8 is supplied in DIESALE (Y) format: an unpackaged silicon die with bond pads, not a leaded or surface-mount packaged device. It has no standardized footprint or pinout compatible with TO-92, SOT-23, or SOIC packages. Integration requires wire bonding or flip-chip assembly onto custom substrates, and LM185-2.5 MD8 must be handled per MIL-STD-883 cleanroom protocols.
What is the maximum junction temperature rating for LM185-2.5 MD8?
The LM185-2.5 MD8 has a maximum junction temperature (TJmax) of 150°C, consistent with its −55°C to +125°C ambient operating range and military-grade thermal design. This rating assumes proper thermal management via substrate conduction-since LM185-2.5 MD8 lacks a package, junction-to-ambient thermal resistance depends entirely on die attach material and heatsinking in the host assembly.
Does LM185-2.5 MD8 require an external capacitor for stability?
No-LM185-2.5 MD8 is explicitly designed to remain stable with output capacitance up to at least 1 µF, unlike many older references that oscillate without series resistance or careful layout. Its internal architecture provides inherent phase margin, so LM185-2.5 MD8 can be used directly with bulk ceramic or tantalum capacitors for noise filtering without risk of ringing or dropout during transients.
How does the temperature coefficient of LM185-2.5 MD8 compare to standard Zener diodes?
LM185-2.5 MD8 achieves a maximum temperature coefficient of 50 ppm/°C-up to 10× better than typical 5.6 V Zener diodes (500–1000 ppm/°C). This results from its band-gap core and on-die trimming, yielding predictable, linear drift over −55°C to +125°C. For example, LM185-2.5 MD8 drifts only ±1.25 mV across that range, whereas a Zener may shift >10 mV unpredictably-making LM185-2.5 MD8 suitable for calibrated instrumentation where Zeners fail.
LM185-2.5 MD8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- -
- Temperature Coefficient:
- -
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 20 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- Die
LM185-2.5 MD8 FAQ
1.How can I place an order for LM185-2.5 MD8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM185-2.5 MD8 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 LM185-2.5 MD8 reliable?
The price and inventory of LM185-2.5 MD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM185-2.5 MD8 is usually 5 days.
3.What payment methods are accepted for LM185-2.5 MD8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM185-2.5 MD8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM185-2.5 MD8?
LM185-2.5 MD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM185-2.5 MD8 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 LM185-2.5 MD8?
For technical support, including LM185-2.5 MD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM185-2.5 MD8 requirements.
6.How does Aetrix verify that LM185-2.5 MD8 is sourced from the original manufacturer or authorized distributors?
All LM185-2.5 MD8 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 LM185-2.5 MD8 meets industry standards.
7.What is the process for return or replacement of LM185-2.5 MD8?
All LM185-2.5 MD8 units undergo pre-shipment inspection (PSI). If there is an issue with LM185-2.5 MD8, 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 LM185-2.5 MD8 part is unused and in its original packaging.
Return procedure for LM185-2.5 MD8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM185-2.5 MD8 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
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