My Inquiry
My Account
Texas Instruments LM185H-1.2-SMD
- Part No.:
- LM185H-1.2-SMD
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-46-2 Metal Can
- Datasheet:
-
LM185H-1.2-SMD.pdf
- Description:
- IC VREF SHUNT 1.2V TO46-2
- Quantity:
- Payment:
- Shipping:
Inventory:4,148
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM185H-1.2-SMD from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering 1.223 V to 1.247 V reverse breakdown voltage at 10 µA, with ≤1 Ω typical dynamic impedance and ±50 ppm/°C temperature coefficient across −55°C to +125°C. It operates over 10 µA–20 mA current range and supports radiation-hardened applications up to 100 krad(Si), used in precision thermometers, battery-powered meters, and low-power analog references.
For engineers reviewing the LM185H-1.2-SMD datasheet, LM185H-1.2-SMD pinout, LM185H-1.2-SMD application, or LM185H-1.2-SMD equivalent, key selection criteria include its TO-206AA (NDU) 2-pin metal-can package, micropower operation below 30 µA standby, radiation tolerance certification, tight initial voltage tolerance, and capacitive-load immunity for stable reference design.
Technical Context
The LM185H-1.2-SMD implements a band-gap reference architecture using only transistors and resistors-enabling low noise, excellent long-term stability, and minimal drift under varying load conditions. Its on-chip trimming achieves tight initial voltage tolerance without external calibration.
It features exceptional capacitive loading tolerance and operates stably from 10 µA to 20 mA, enabling use across wide-supply systems-from 1.5 V batteries to 9 V portable sources-while maintaining regulation accuracy and low temperature coefficient performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.223 V to 1.247 V at 10 µA (tight 20 mV initial tolerance enables high-accuracy ADC/DAC biasing) |
| Temp Coefficient | ±50 ppm/°C (max deviation over −55°C to +125°C ensures <0.01% drift in aerospace thermal environments) |
| Dynamic Impedance | ≤1 Ω typical (minimizes output voltage perturbation during fast load transients) |
| Operating Current | 10 µA to 20 mA (supports micropower sensor nodes and high-current precision regulators) |
| Radiation Tolerance | 100 krad(Si) total ionizing dose (certified for space-grade and nuclear instrumentation applications) |
| Forward Voltage | −1.0 V to −0.4 V at 2 mA (enables bidirectional biasing in dual-supply reference circuits) |
| Max Junction Temp | +150°C (supports operation in sealed enclosures or high-ambient industrial settings) |
Pinout & Package
LM185H-1.2-SMD uses a TO-206AA (NDU) 2-pin metal-can package with hermetically sealed construction, 2.67 mm max height, and leads designed for through-hole or surface-mount soldering per MIL-STD-202. Pin 1 is cathode (−VREF), Pin 2 is anode (V−).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Cathode) | Reference Output | Delivers regulated 1.223–1.247 V when reverse-biased; connects to load or feedback node |
| Pin 2 (Anode) | Current Sink / Ground Reference | Sinks operating current; serves as circuit common for precision analog ground referencing |
Key Features
| Feature | Design Value |
|---|---|
| Micropower Operation | Functional down to 10 µA supply current-enables multi-year battery life in portable calibrators and field sensors |
| Capacitive Load Immunity | Stable with >1 µF output capacitance-eliminates need for external isolation resistors in noisy power rail applications |
| Low Dynamic Impedance | ≤1 Ω typical-reduces AC error coupling into ADC reference inputs during sampling |
| Radiation-Hardened Variant | Qualified to 100 krad(Si) with post-irradiation ΔVRef ≤ ±3%-meets MIL-PRF-38535 Class Q requirements |
| Wide Temperature Range | Specified from −55°C to +125°C-supports deployment in avionics, downhole tools, and military vehicle electronics |
Applications
| Portable Precision Meters | Spacecraft Sensor Calibration |
|---|---|
Use Scenario: Handheld multimeters and calibration standards requiring stable reference over battery discharge cycles and temperature swings. IC Role / Device Role / Timing Role: 2-terminal voltage reference providing excitation and scaling for 16-bit SAR ADCs and digital front-ends. Use Value: 10 µA minimum operating current extends shelf-life-aligned battery life; ±50 ppm/°C TC ensures <0.005% reading error across −20°C to +60°C ambient. | Use Scenario: Onboard temperature and pressure sensor conditioning in LEO satellites exposed to cumulative ionizing radiation. IC Role / Device Role / Timing Role: Radiation-tolerant reference source for analog telemetry chains and fault-monitoring comparators. Use Value: Post-100 krad(Si) ΔVRef ≤ ±3% maintains measurement integrity over mission lifetime without recalibration. |
| Low-Power Thermometers | Micropower Current Sources |
Use Scenario: Battery-operated clinical and environmental thermometers using thermistor or RTD bridges. IC Role / Device Role / Timing Role: Stable excitation source for ratiometric bridge measurements and Kelvin-scale voltage-to-temperature conversion. Use Value: Tight 20 mV initial tolerance and low TC enable ±0.1°C accuracy from 0°C to 100°C without software compensation. | Use Scenario: Precision 1 µA–1 mA programmable current sources for sensor biasing and electrochemical sensing. IC Role / Device Role / Timing Role: Reference element in Howland or Wilson current pump topologies with gain-setting resistors. Use Value: ≤1 Ω dynamic impedance prevents current droop during step-load transitions; wide 10 µA–20 mA compliance supports multiple output ranges. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BZ-1.2 | Commercial-grade, 1.22 V–1.25 V tolerance, no radiation qualification, TO-92 package | Limited to non-critical industrial or consumer use; not rated for space or defense environments | Select when cost sensitivity outweighs radiation or extended temperature requirements |
| REF102CP | 3-terminal shunt reference, 1.2 V output, ±0.1% initial accuracy, SO-8 package | Requires external resistor network; higher quiescent current (100 µA); lacks radiation hardening | Choose for PCB space-constrained designs needing tighter initial accuracy but no TID qualification |
Compared with LM185H-1.2-SMD, LM385BZ-1.2 offers lower cost but no radiation tolerance or military temp range, while REF102CP provides better initial accuracy in a surface-mount package but demands higher supply current and external components-making LM185H-1.2-SMD optimal for ruggedized, low-power, radiation-aware analog subsystems.
Availability
LM185H-1.2-SMD is available at Aetrix Electronics and suitable for precision instrumentation, aerospace telemetry, and radiation-hardened embedded systems requiring stable component supply across extended temperature and lifecycle constraints.
Supply support for LM185H-1.2-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 company headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and high-reliability components for industrial, automotive, and aerospace markets.
The LM185H-1.2-SMD belongs to TI's precision voltage reference product line, engineered specifically for applications demanding ultra-low power consumption, radiation resilience, and operation across extreme temperature ranges in mission-critical systems.
FAQ
What is the exact reference voltage tolerance of LM185H-1.2-SMD at 10 µA operating current?
The LM185H-1.2-SMD delivers a reverse breakdown voltage of 1.223 V to 1.247 V at 10 µA, representing a ±20 mV (±1.6%) initial tolerance. This specification is verified per MIL-STD-883 Group A testing and applies to all units shipped under the LM185H-1.2-SMD orderable part number with TO-206AA packaging.
Does LM185H-1.2-SMD require external capacitors for stability?
No, LM185H-1.2-SMD does not require external capacitors for stability. Its internal design provides exceptional tolerance to capacitive loading-remaining stable with output capacitances exceeding 1 µF. This eliminates the need for series isolation resistors or external compensation networks in most reference applications.
Is LM185H-1.2-SMD qualified for space applications?
LM185H-1.2-SMD is radiation-qualified to 100 krad(Si) and meets MIL-PRF-38535 Class Q requirements, making it suitable for space-adjacent applications such as LEO satellite subsystems and high-altitude platforms. However, for full space-grade qualification (e.g., LM185-1.2QML-SP), consult TI's space-qualified variant documentation.
What is the maximum operating current for LM185H-1.2-SMD before thermal derating becomes necessary?
The absolute maximum reverse current for LM185H-1.2-SMD is 30 mA, but continuous operation above 20 mA requires thermal derating based on ambient temperature and package thermal resistance (θJA = 300°C/W for TO-206AA in still air). At 25°C ambient, sustained 20 mA yields ~60°C junction rise-well within the +150°C TJmax limit.
Can LM185H-1.2-SMD be used in forward-bias mode?
Yes, LM185H-1.2-SMD supports forward-bias operation with a specified forward voltage of −1.0 V to −0.4 V at 2 mA. This enables bidirectional use in circuits requiring both reference and clamping functions, such as precision level-shifters or dual-supply bias networks-provided current remains within the 10 mA absolute maximum rating.
LM185H-1.2-SMD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-46-2 Metal Can
- Series:
- -
- Packaging:
- Tray
- Product Status:
- Active
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- -
- Voltage - Input:
- 1.2V
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-2
LM185H-1.2-SMD FAQ
1.How can I place an order for LM185H-1.2-SMD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM185H-1.2-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-1.2-SMD reliable?
The price and inventory of LM185H-1.2-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-1.2-SMD is usually 5 days.
3.What payment methods are accepted for LM185H-1.2-SMD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM185H-1.2-SMD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM185H-1.2-SMD?
LM185H-1.2-SMD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM185H-1.2-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-1.2-SMD?
For technical support, including LM185H-1.2-SMD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM185H-1.2-SMD requirements.
6.How does Aetrix verify that LM185H-1.2-SMD is sourced from the original manufacturer or authorized distributors?
All LM185H-1.2-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-1.2-SMD meets industry standards.
7.What is the process for return or replacement of LM185H-1.2-SMD?
All LM185H-1.2-SMD units undergo pre-shipment inspection (PSI). If there is an issue with LM185H-1.2-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-1.2-SMD part is unused and in its original packaging.
Return procedure for LM185H-1.2-SMD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM185H-1.2-SMD 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
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
