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Texas Instruments LM185BYH-1.2/NOPB
- Part No.:
- LM185BYH-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-46-2 Metal Can
- Datasheet:
-
LM185BYH-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO2
- Quantity:
- Payment:
- Shipping:
Inventory:2,173
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Product details
Overview
LM185BYH-1.2/NOPB from Texas Instruments is a hermetically sealed, micropower 2-terminal band-gap voltage reference diode delivering a precise 1.235 V output with ±1% initial tolerance, 50 ppm/°C temperature coefficient (Y-suffix), and 1 Ω dynamic impedance across 10 μA–20 mA operating current. It operates from −55°C to +125°C and is used in battery-powered precision analog circuits, portable instrumentation, and low-power thermocouple compensation.
For engineers reviewing the LM185BYH-1.2/NOPB datasheet, LM185BYH-1.2/NOPB pinout, LM185BYH-1.2/NOPB application, or LM185BYH-1.2/NOPB equivalent, this page provides verified technical context, package-specific pin roles, real-world use cases, and validated alternative options for high-reliability industrial and aerospace designs requiring stable low-voltage references.
Technical Context
The LM185BYH-1.2/NOPB uses a band-gap reference architecture with on-chip trimming to achieve tight voltage accuracy without external calibration. Its two-terminal configuration simplifies integration into current-source or shunt-regulator topologies while maintaining low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm over 1000 hours).
Designed for extreme environmental resilience, it features hermetic TO packaging (NDU drawing), rated for −55°C to +125°C operation and 150°C maximum junction temperature. The device exhibits exceptional capacitive loading tolerance and operates stably down to 10 μA, enabling ultra-low-power applications such as 1.5 V battery references and micropower current sources.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures accurate biasing in precision ADCs and sensor signal chains without post-manufacture trimming. |
| Temperature Coefficient | 50 ppm/°C (Y-suffix); enables stable reference performance across military-grade temperature ranges (−55°C to +125°C) with minimal drift-induced error. |
| Dynamic Impedance | 1 Ω at 100 μA; maintains regulation integrity under varying load currents, critical for low-noise analog front-ends and precision current mirrors. |
| Operating Current Range | 10 μA to 20 mA; supports micropower systems (e.g., 1.5 V battery operation) while retaining full accuracy up to 20 mA for higher-drive applications. |
| Long-Term Stability | 20 ppm over 1000 hours; guarantees predictable reference drift in mission-critical instrumentation and calibration equipment over extended service life. |
| Wideband Noise | 60 μVrms (10 Hz–10 kHz); minimizes added noise in high-resolution measurement systems where reference noise directly impacts effective resolution. |
Pinout & Package
LM185BYH-1.2/NOPB is supplied in a hermetic TO package (NDU drawing), featuring a 2-pin configuration with no internal die attach pad connection. This metal-can package provides superior moisture resistance and thermal stability for harsh-environment applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink input | Connected to system ground or current-limiting resistor; defines reference node polarity and establishes reverse-bias operating condition. |
| Cathode (Pin 2) | Reference voltage output | Provides stable 1.235 V output when reverse-biased; serves as precision voltage node for regulators, comparators, or ADC references. |
Key Features
| Feature | Design Value |
|---|---|
| Hermetic TO packaging | Enables operation in high-humidity, high-reliability, and extended-temperature environments (−55°C to +125°C) without parameter degradation. |
| ±1% initial voltage tolerance | Eliminates need for external trimming in production test, reducing BOM count and assembly cost in precision analog modules. |
| 10 μA minimum operating current | Supports direct use with single-cell 1.5 V batteries and ultra-low-quiescent-current regulators, extending shelf-life-equivalent battery life. |
| Low 60 μVrms noise | Preserves signal-to-noise ratio in 16-bit+ data acquisition systems where reference noise dominates total system noise floor. |
| Capacitive loading immunity | Stable operation with >1 μF output capacitance allows direct decoupling without phase-margin concerns in noisy power domains. |
Applications
| Portable Precision Meters | Micropower Battery References |
|---|---|
|
Use Scenario: Handheld multimeters and portable DMMs powered by 9 V or AA batteries requiring stable, low-drift reference for 4½-digit DC voltage measurement. IC Role / Device Role / Timing Role: Shunt voltage reference providing 1.235 V基准 for ADC internal scaling and offset calibration. Use Value: Enables ±0.025% basic DCV accuracy over −20°C to +60°C ambient, meeting IEC 61010-1 portable instrument requirements. |
Use Scenario: Low-power IoT sensor nodes using coin-cell or alkaline batteries where reference current must stay below 20 μA to extend operational lifetime beyond 5 years. IC Role / Device Role / Timing Role: Micropower shunt reference establishing precise bias for op-amps and SAR ADCs in sleep-mode wake-up circuits. Use Value: Delivers 1.235 V with <20 μA quiescent draw, enabling >10-year shelf-life-equivalent runtime in always-on environmental monitoring devices. |
| Aerospace Sensor Conditioning | Thermocouple Cold-Junction Compensation |
|
Use Scenario: Pressure and temperature transducers in satellite subsystems requiring radiation-tolerant, wide-temperature-range voltage references for signal conditioning. IC Role / Device Role / Timing Role: Primary reference source for ratiometric bridge amplifiers and 24-bit sigma-delta ADCs in telemetry front-ends. Use Value: Maintains ±0.5 mV output stability over −55°C to +125°C, supporting MIL-STD-883 Class B qualification for space-grade analog signal chains. |
Use Scenario: Industrial furnace controllers using Type K or J thermocouples where cold-junction temperature must be measured with <0.5°C error. IC Role / Device Role / Timing Role: Precision Kelvin-scale voltage source generating 1.235 V per 1000 K for linearized cold-junction voltage synthesis. Use Value: Achieves <0.3°C cold-junction accuracy over 0°C–100°C range via direct Kelvin-proportional current sourcing, eliminating lookup-table interpolation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM185H-1.2/NOPB | Same TO package and −55°C to +125°C rating, but X-suffix (30 ppm/°C) and ±1% tolerance; no Y-suffix temperature coefficient. | Lower tempco makes it suitable for less demanding industrial applications but not for high-accuracy aerospace or metrology use. | Select LM185H-1.2/NOPB only if 30 ppm/°C tempco suffices and Y-suffix performance is not required. |
| REF102BP | Monolithic 1.2 V reference in TO-99 metal can; ±0.1% initial tolerance, 3 ppm/°C tempco, but requires ≥100 μA operating current. | Higher accuracy and lower drift, but incompatible with sub-100 μA micropower systems due to minimum current requirement. | Choose REF102BP only when ultra-high precision justifies higher current consumption and cost premium. |
Compared with LM185H-1.2/NOPB, LM185BYH-1.2/NOPB delivers tighter temperature stability (50 vs. 30 ppm/°C) essential for wide-temperature calibration, while REF102BP offers superior accuracy at the expense of micropower capability-making LM185BYH-1.2/NOPB the optimal balance for rugged, low-current, high-stability reference needs.
Availability
LM185BYH-1.2/NOPB is available at Aetrix Electronics and suitable for aerospace instrumentation, military-grade sensors, and high-reliability industrial control systems requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM185BYH-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 heritage in precision reference design and high-reliability component manufacturing.
The LM185 series was developed specifically for demanding analog applications requiring stable, low-power, wide-temperature voltage references-targeting aerospace, defense, and industrial instrumentation markets where long-term accuracy and environmental resilience are non-negotiable.
FAQ
What is the exact reference voltage and initial tolerance of LM185BYH-1.2/NOPB?
The LM185BYH-1.2/NOPB has a nominal reference voltage of 1.235 V with a guaranteed initial tolerance of ±1% at 25°C, verified across the full 10 μA–20 mA operating current range. This tolerance is achieved through on-chip laser trimming and applies specifically to the BYH variant as confirmed in TI's SNVS742E datasheet Electrical Characteristics table.
Does LM185BYH-1.2/NOPB require an external capacitor for stability?
No-LM185BYH-1.2/NOPB is explicitly designed for exceptional capacitive loading tolerance and remains stable with output capacitances exceeding 1 μF. This eliminates the need for external stabilization capacitors in most applications, simplifying layout and improving reliability in space-constrained or high-vibration environments.
What is the operating temperature range and junction limit for LM185BYH-1.2/NOPB?
LM185BYH-1.2/NOPB is rated for operation from −55°C to +125°C ambient, with a maximum junction temperature (TJ(max)) of 150°C. Its hermetic TO package ensures consistent thermal performance and parameter stability across this full military-grade range, as documented in Table 1 of the SNVS742E datasheet.
How does the Y-suffix in LM185BYH-1.2/NOPB affect temperature coefficient?
The Y-suffix denotes a guaranteed average temperature coefficient of 50 ppm/°C, measured across the full operating range (−55°C to +125°C). This is distinct from X-suffix (30 ppm/°C) and standard variants (150 ppm/°C), and is confirmed in the Electrical Characteristics table under "Average Temperature Coefficient (5)" for LM185BY-1.2-N.
Can LM185BYH-1.2/NOPB be used in a 1.5 V battery-powered circuit?
Yes-LM185BYH-1.2/NOPB operates reliably down to 10 μA, enabling direct use with 1.5 V alkaline cells in configurations like Figure 16 of the datasheet. Its low dropout behavior and stable 1.235 V output allow precision referencing even as battery voltage declines to ~1.3 V, sustaining accuracy until end-of-life.
LM185BYH-1.2/NOPB 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):
- 1.235V
- Voltage - Output (Max):
- -
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 60µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 10 µA
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-2
LM185BYH-1.2/NOPB FAQ
1.How can I place an order for LM185BYH-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM185BYH-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 LM185BYH-1.2/NOPB reliable?
The price and inventory of LM185BYH-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 LM185BYH-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM185BYH-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM185BYH-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM185BYH-1.2/NOPB?
LM185BYH-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM185BYH-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 LM185BYH-1.2/NOPB?
For technical support, including LM185BYH-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM185BYH-1.2/NOPB requirements.
6.How does Aetrix verify that LM185BYH-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM185BYH-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 LM185BYH-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM185BYH-1.2/NOPB?
All LM185BYH-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM185BYH-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 LM185BYH-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM185BYH-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM185BYH-1.2/NOPB Tags
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