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Texas Instruments LM285H-1.2/NOPB
- Part No.:
- LM285H-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-46-2 Metal Can
- Datasheet:
-
LM285H-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO2
- Quantity:
- Payment:
- Shipping:
Inventory:1,878
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Product details
Overview
LM285H-1.2/NOPB from Texas Instruments is a micropower 2-terminal band-gap voltage reference diode delivering a precise 1.235 V output with ±1% initial tolerance, 1 Ω dynamic impedance, and operation across 10 μA–20 mA current range. It serves as a stable low-voltage reference in battery-powered instrumentation, portable meters, and precision analog circuits requiring minimal quiescent current.
For engineers reviewing the LM285H-1.2/NOPB datasheet, LM285H-1.2/NOPB pinout, LM285H-1.2/NOPB application, or LM285H-1.2/NOPB equivalent, this page provides verified technical context, package-specific pin roles, real-world use cases, and validated alternative options for design-in and supply continuity planning.
Technical Context
The LM285H-1.2/NOPB implements a band-gap reference architecture using only transistors and resistors-enabling low noise, excellent long-term stability, and exceptional tolerance to capacitive loading. Its two-terminal configuration simplifies integration into both shunt and series regulator topologies without external biasing components.
Rated for −40°C to +85°C operation, it achieves 30 ppm/°C average temperature coefficient (X-suffix variant), supports wide dynamic current range (10 μA to 20 mA), and maintains low 1 Ω dynamic impedance at 100 μA test current-critical for high-accuracy, low-power sensing and calibration circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures accurate system-level calibration without post-manufacture trimming. |
| Initial Tolerance | ±1% at 25°C; enables direct use in precision applications like thermocouple cold-junction compensation and centigrade thermometer designs. |
| Operating Current Range | 10 μA to 20 mA; allows compatibility with ultra-low-power microcontrollers and high-current analog front-ends without redesign. |
| Dynamic Impedance | 1 Ω at 100 μA; minimizes output voltage variation under load transients, improving stability in feedback loops and ADC reference paths. |
| Temperature Coefficient | 30 ppm/°C (X-suffix); guarantees ≤±3.7 mV drift over −40°C to +85°C, supporting industrial-grade accuracy in unregulated environments. |
| Long-Term Stability | 20 ppm over 1000 hours; reduces calibration drift in field-deployed equipment such as handheld multimeters and environmental sensors. |
Pinout & Package
LM285H-1.2/NOPB is supplied in a hermetic TO-92 package (LP drawing) with three leads. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is internally connected to the die attach pad-intended to be tied to Pin 2 (Cathode) or left floating per TI's recommended layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Current entry point; connects to ground or low-side return path in shunt reference configurations. |
| Pin 2 | Cathode | Reference output node; delivers regulated 1.235 V when reverse-biased within operating current range. |
| Pin 3 | Die Attach Pad | Internally bonded to substrate; electrically tied to cathode-must be connected to Pin 2 or left floating per thermal/mechanical requirements. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Functional down to 10 μA-enables multi-year battery life in portable meters and IoT sensor nodes. |
| Capacitive load tolerance | Stable with >10 μF output capacitance-eliminates need for external isolation resistors in noisy or high-ESR environments. |
| Low dynamic impedance | 1 Ω at 100 μA-ensures <1 mV output shift during 1 mA load steps, critical for 12-bit+ ADC references. |
| Hermetic TO-92 packaging | Sealed ceramic-metal construction-provides superior moisture resistance and long-term parameter stability vs. molded plastic variants. |
| Wide temperature range | −40°C to +85°C operational rating-supports deployment in automotive cabin electronics and industrial control panels. |
Applications
| Portable Multimeter Reference | Precision Thermocouple Compensator |
|---|---|
|
Use Scenario: Handheld digital multimeter requiring stable 1.235 V reference for autoranging ADC and auto-zero circuitry. IC Role / Device Role / Timing Role: Two-terminal shunt voltage reference providing excitation and scaling for 24-bit sigma-delta ADC. Use Value: Enables ±0.05% basic DCV accuracy with no external trimming, leveraging ±1% initial tolerance and 30 ppm/°C TC. |
Use Scenario: Cold-junction compensation circuit for Type-K thermocouples in data loggers operating from 1.5 V coin cells. IC Role / Device Role / Timing Role: Precision voltage source generating Kelvin-proportional current for thermocouple offset correction. Use Value: Delivers 1.235 V at 10 μA-sufficient to drive 1 kΩ compensation network while consuming <15 μW total power. |
| Low-Power Battery Monitor | Calibration Standard for Sensor Modules |
|
Use Scenario: Li-ion battery fuel gauge IC monitoring cell voltage across 2.5 V–4.2 V range in wearables. IC Role / Device Role / Timing Role: Fixed reference for internal comparator thresholds and ADC reference rail in power management IC. Use Value: Maintains <±2 mV error over full temperature range, enabling accurate state-of-charge estimation below 5% remaining capacity. |
Use Scenario: Factory calibration fixture for MEMS pressure sensors requiring traceable 1.235 V reference during final test. IC Role / Device Role / Timing Role: Primary voltage standard against which sensor output gain and offset are adjusted. Use Value: 20 ppm long-term stability ensures calibration validity for ≥12 months, reducing recalibration frequency and test cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385Z-1.2/NOPB | Same 1.235 V reference, but rated for 0°C to 70°C and packaged in low-cost TO-92 (LP). | Not suitable for extended industrial temperature operation; limited to commercial-grade embedded systems. | Select when ambient temperature stays within 0°C–70°C and cost sensitivity outweighs hermetic reliability needs. |
| LM285BXZ-1.2/NOPB | Same TO-92 package and −40°C to +85°C rating, but ±2% initial tolerance and 50 ppm/°C TC (Y-suffix). | Lower accuracy limits use in sub-0.1% measurement systems; acceptable for general-purpose regulation. | Choose where ±2% tolerance and higher drift are acceptable-e.g., non-critical biasing or coarse calibration. |
Compared with LM385Z-1.2/NOPB and LM285BXZ-1.2/NOPB, the LM285H-1.2/NOPB offers tighter ±1% tolerance and lower 30 ppm/°C temperature coefficient in a hermetically sealed TO-92 package-making it the preferred choice for industrial instrumentation and long-life battery-powered devices demanding metrological-grade stability.
Availability
LM285H-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, industrial sensor calibration, and battery-powered metering applications requiring stable component supply across extended temperature ranges and multi-year product lifecycles.
Supply support for LM285H-1.2/NOPB 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 and embedded processing technologies, with decades of expertise in precision analog ICs and voltage references.
The LM285H-1.2/NOPB belongs to TI's micropower band-gap voltage reference family, designed specifically for low-power, high-accuracy applications including portable test equipment, sensor signal conditioning, and energy-harvesting systems.
FAQ
What is the operating temperature range of the LM285H-1.2/NOPB?
The LM285H-1.2/NOPB is rated for continuous operation from −40°C to +85°C. This industrial-grade temperature range is confirmed in the SNVS742E datasheet and distinguishes it from commercial variants like the LM385Z-1.2/NOPB (0°C to 70°C). The LM285H-1.2/NOPB maintains its ±1% initial tolerance and 30 ppm/°C temperature coefficient across this full span, making it suitable for deployment in automotive cabin modules and factory-floor instrumentation where ambient extremes occur.
Does the LM285H-1.2/NOPB require an external capacitor for stability?
No, the LM285H-1.2/NOPB does not require an external capacitor for stability. Its internal design provides exceptional tolerance to capacitive loading-TI explicitly states it remains stable with >10 μF output capacitance. This eliminates the need for series isolation resistors or external compensation networks, simplifying PCB layout and improving reliability in high-ESR or noisy supply environments where the LM285H-1.2/NOPB is commonly used.
What is the minimum operating current for the LM285H-1.2/NOPB?
The LM285H-1.2/NOPB functions reliably down to 10 μA, as specified in the Electrical Characteristics table of the SNVS742E datasheet. At this current, it maintains regulation within its specified 1.235 V ±1% window and exhibits low dynamic impedance. This micropower capability enables use in ultra-low-duty-cycle applications such as wake-on-event sensor nodes, where the LM285H-1.2/NOPB supplies reference voltage only during brief measurement windows to extend battery life.
Is the LM285H-1.2/NOPB RoHS compliant and lead-free?
Yes, the LM285H-1.2/NOPB is RoHS compliant and lead-free. Per TI's PACKAGE OPTION ADDENDUM (6-Feb-2020), the "/NOPB" suffix denotes Green (RoHS & no Sb/Br) compliance with lead-free solder finish (POST-PLATE), and it carries JEDEC MSL Level-1 rating for unlimited floor life. This makes the LM285H-1.2/NOPB suitable for modern lead-free reflow processes and environmentally regulated markets without requiring special handling or exemptions.
How does the LM285H-1.2/NOPB differ from the LM285Z-1.2/NOPB?
The LM285H-1.2/NOPB uses a hermetic TO package (NDU drawing), while the LM285Z-1.2/NOPB uses a molded TO-92 (LP). The LM285H-1.2/NOPB features ±1% initial tolerance and 30 ppm/°C temperature coefficient (X-suffix), whereas the LM285Z-1.2/NOPB has ±2% tolerance and 50 ppm/°C TC (Y-suffix). Both share the −40°C to +85°C rating, but the hermetic construction of the LM285H-1.2/NOPB delivers superior long-term stability and moisture resistance-critical for mission-critical calibration standards.
LM285H-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-46-2 Metal Can
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Reference Type:
- Shunt
- Output Type:
- Fixed
- Voltage - Output (Min/Fixed):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 150ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-2
LM285H-1.2/NOPB FAQ
1.How can I place an order for LM285H-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM285H-1.2/NOPB 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 LM285H-1.2/NOPB reliable?
The price and inventory of LM285H-1.2/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM285H-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM285H-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM285H-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM285H-1.2/NOPB?
LM285H-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM285H-1.2/NOPB 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 LM285H-1.2/NOPB?
For technical support, including LM285H-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM285H-1.2/NOPB requirements.
6.How does Aetrix verify that LM285H-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM285H-1.2/NOPB 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 LM285H-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM285H-1.2/NOPB?
All LM285H-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM285H-1.2/NOPB, 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 LM285H-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM285H-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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