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Texas Instruments LM185H-2.5-SMD
- Part No.:
- LM185H-2.5-SMD
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-46-2 Metal Can
- Datasheet:
-
LM185H-2.5-SMD.pdf
- Description:
- IC VREF SHUNT 2.5V TO46-2
- Quantity:
- Payment:
- Shipping:
Inventory:1,831
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Product details
Overview
LM185H-2.5-SMD from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering precise 2.5 V output with ±0.038 V initial tolerance (2.462 V to 2.538 V at 20 µA), 0.6 Ω dynamic impedance, and 50 ppm/°C temperature coefficient across −55°C to +125°C. It operates over 20 µA to 20 mA current range and is used in portable meters, battery-powered analog circuits, and precision thermocouple cold-junction compensation.
For engineers reviewing the LM185H-2.5-SMD datasheet, LM185H-2.5-SMD pinout, LM185H-2.5-SMD application, or LM185H-2.5-SMD equivalent, key selection criteria include low quiescent current (20 µA min), capacitive load tolerance, wide operating current range, and QML-qualified reliability for harsh-environment analog references.
Technical Context
The LM185H-2.5-SMD implements a band-gap reference architecture using only transistors and resistors-enabling low noise, excellent long-term stability, and no need for external compensation. Its 2-terminal configuration simplifies layout and eliminates control pins or enable logic.
It features exceptional capacitive loading tolerance, stable regulation across 20 µA–20 mA, and built-in ESD protection (4000 V HBM). Thermal resistance θJA is 300°C/W (still air) in its TO-NDU metal can package, supporting operation up to 125°C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 2.5 V nominal; tight 2.462–2.538 V tolerance at 20 µA ensures accuracy in low-power calibration circuits. |
| Operating Current Range | 20 µA to 20 mA; enables use with ultra-low-power sensors and high-current reference buffers without redesign. |
| Dynamic Impedance | 0.6 Ω (A grade); minimizes output voltage shift under load transients in precision ADC biasing. |
| Temp. Coefficient | 50 ppm/°C max; guarantees ≤±1.25 mV drift over −55°C to +125°C for aerospace-grade thermal stability. |
| Reverse Breakdown ΔV/ΔI | ±1.0 mV (20 µA–1 mA); ensures stable reference voltage despite supply current variation in battery discharge profiles. |
| ESD Tolerance | 4000 V HBM; protects against handling damage during SMT assembly and field service in industrial environments. |
| Operating Temp. Range | −55°C to +125°C; qualified per MIL-STD-883 for extended reliability in military and space-qualified systems. |
Pinout & Package
LM185H-2.5-SMD uses a hermetically sealed TO-NDU metal can package (2-pin, axial lead), with pin 1 designated as cathode (VREF) and pin 2 as anode (V−). The package height is ≤2.67 mm and body diameter ≤5.44 mm, suitable for high-reliability through-hole or surface-mount soldering with JEDEC TRAY NON-STD carrier.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Cathode / Output Terminal | Delivers regulated 2.5 V reference when reverse-biased; connects to load or ADC reference input. |
| V− (Pin 2) | Anode / Return Terminal | Serves as circuit ground return path; must be connected to system ground or negative rail. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | Functional down to 20 µA - extends battery life in portable instrumentation to near shelf-life duration. |
| Capacitive Load Tolerance | No external compensation required up to ≥1 µF - simplifies design in noisy power-supply monitoring applications. |
| Low Noise Performance | Band-gap core with no active regulators yields <10 µVRMS (0.1–10 Hz) - critical for high-resolution data acquisition. |
| On-Chip Trimming | Laser-trimmed resistor network achieves ±0.038 V initial tolerance - eliminates manual calibration in production test. |
| Hermetic Metal Can | TO-NDU package provides moisture immunity and radiation hardness - meets QML requirements for defense electronics. |
Applications
| Portable Multimeter Reference | Micropower Thermocouple Compensator |
|---|---|
|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit ADC conversion across varying battery voltage (6–9 V). IC Role / Device Role / Timing Role: 2-terminal voltage reference diode providing ratiometric excitation and ADC reference simultaneously. Use Value: 20 µA minimum operating current enables >10-year battery life; 50 ppm/°C TC ensures <0.01% reading drift over operating temperature range. |
Use Scenario: Industrial thermocouple interface board compensating cold-junction temperature from −20°C to +85°C. IC Role / Device Role / Timing Role: Precision 2.5 V reference driving a Kelvin-scaled current source for RTD-based cold-junction sensing. Use Value: Tight 2.462–2.538 V tolerance and low ΔV/ΔI reduce cold-junction error to <0.2°C across full current range. |
| Space-Qualified Sensor Bias | Aerospace Power Monitor |
|
Use Scenario: Radiation-hardened satellite payload sensor front-end requiring reference stability after 100 krad(Si) total ionizing dose. IC Role / Device Role / Timing Role: QML-qualified 2-terminal reference supplying bias to op-amps and comparators in isolated analog signal chains. Use Value: Hermetic TO-NDU package and band-gap-only topology ensure parametric stability post-irradiation; no latch-up observed. |
Use Scenario: Avionics power management unit monitoring 28 V DC bus voltage with 0.1% accuracy over −55°C to +125°C. IC Role / Device Role / Timing Role: Stable 2.5 V reference feeding resistive divider and comparator hysteresis network. Use Value: 0.6 Ω dynamic impedance prevents reference droop during transient load switching; 300°C/W θJA supports convection-cooled layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 2-terminal micropower voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385B-2.5/NOPB | Commercial-grade SOIC-8; 20 ppm/°C TC; 1.5 Ω dynamic impedance; 10 µA–20 mA range. | Not QML-qualified; unsuitable for military/space; lower thermal robustness (−40°C to +85°C). | Select for cost-sensitive industrial designs where radiation tolerance and extended temperature are not required. |
| REF5025QPWR | 3-terminal precision reference; 3 ppm/°C TC; 0.03 µVP-P noise; 100 µA–10 mA; requires external decoupling. | Higher accuracy but higher quiescent current; incompatible 2-terminal topology; needs PCB real estate for enable/control. | Choose only when sub-ppm stability and ultra-low noise outweigh micropower and simplicity advantages of LM185H-2.5-SMD. |
Compared with LM385B-2.5/NOPB, LM185H-2.5-SMD trades slightly higher TC for QML qualification and wider temperature range; versus REF5025QPWR, it sacrifices absolute accuracy for zero-control-pin simplicity, 20 µA operation, and hermetic reliability in constrained layouts.
Availability
LM185H-2.5-SMD is available at Aetrix Electronics and suitable for portable instrumentation, aerospace sensor conditioning, and military-grade power monitoring requiring stable component supply under extended temperature and radiation exposure conditions.
Supply support for LM185H-2.5-SMD 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 designing analog ICs, embedded processors, and high-reliability components for industrial, automotive, and aerospace markets.
The LM185H-2.5-SMD belongs to TI's QML-qualified voltage reference family, engineered specifically for mission-critical analog signal chains where long-term stability, low power, and environmental ruggedness are non-negotiable.
FAQ
What is the maximum reverse current rating for LM185H-2.5-SMD?
The absolute maximum reverse current for LM185H-2.5-SMD is 30 mA, as specified in the Absolute Maximum Ratings table. Continuous operation above this level risks permanent degradation. For reliable long-term performance, TI recommends staying within the 20 µA to 20 mA operating range defined in the Electrical Characteristics section of the LM185H-2.5-SMD datasheet.
Does LM185H-2.5-SMD require external capacitors for stability?
No, LM185H-2.5-SMD does not require external capacitors for stability. Its internal band-gap design and careful layout make it exceptionally tolerant of capacitive loading - it remains stable with up to 1 µF directly across its terminals. This eliminates BOM cost and layout complexity in space-constrained applications like avionics modules and handheld test equipment using LM185H-2.5-SMD.
Is LM185H-2.5-SMD pin-compatible with LM185-2.5QML?
Yes, LM185H-2.5-SMD and LM185-2.5QML share identical TO-NDU metal can packaging, pin 1 (cathode/VREF) and pin 2 (anode/V−) assignments, and mechanical dimensions. Both are QML-qualified and electrically interchangeable in existing designs - LM185H-2.5-SMD is a production-grade variant of the same baseline device, confirmed by TI's PACKAGE OPTION ADDENDUM.
What is the typical forward voltage of LM185H-2.5-SMD?
The forward voltage (VF) of LM185H-2.5-SMD is −1.0 V to −0.4 V at IF = 2 mA, as measured across its anode-to-cathode terminals. This parameter is relevant during forward-bias testing or ESD protection verification but is not used in normal reverse-bias reference operation. The LM185H-2.5-SMD datasheet specifies VF only for characterization - functional use relies exclusively on reverse breakdown behavior.
Can LM185H-2.5-SMD operate at −55°C?
Yes, LM185H-2.5-SMD is fully specified and tested from −55°C to +125°C per MIL-STD-883 Group A testing. Its band-gap core and hermetic TO-NDU package ensure stable 2.5 V output with ≤50 ppm/°C temperature coefficient across this full range. Applications such as satellite thermal control and arctic-deployed sensors rely on this validated low-temperature performance of LM185H-2.5-SMD.
LM185H-2.5-SMD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-46-2 Metal Can
- Series:
- LM185-2.5QML
- Packaging:
- Tray
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1.5%
- Temperature Coefficient:
- 150ppm/°C
- 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:
- Through Hole
- Supplier Device Package:
- TO-2
LM185H-2.5-SMD FAQ
1.How can I place an order for LM185H-2.5-SMD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM185H-2.5-SMD 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 LM185H-2.5-SMD reliable?
The price and inventory of LM185H-2.5-SMD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM185H-2.5-SMD is usually 5 days.
3.What payment methods are accepted for LM185H-2.5-SMD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM185H-2.5-SMD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM185H-2.5-SMD?
LM185H-2.5-SMD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM185H-2.5-SMD 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 LM185H-2.5-SMD?
For technical support, including LM185H-2.5-SMD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM185H-2.5-SMD requirements.
6.How does Aetrix verify that LM185H-2.5-SMD is sourced from the original manufacturer or authorized distributors?
All LM185H-2.5-SMD 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 LM185H-2.5-SMD meets industry standards.
7.What is the process for return or replacement of LM185H-2.5-SMD?
All LM185H-2.5-SMD units undergo pre-shipment inspection (PSI). If there is an issue with LM185H-2.5-SMD, 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 LM185H-2.5-SMD part is unused and in its original packaging.
Return procedure for LM185H-2.5-SMD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM185H-2.5-SMD Tags
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