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Texas Instruments LM385BYM-1.2/NOPB
- Part No.:
- LM385BYM-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM385BYM-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,596
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Product details
Overview
LM385BYM-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, 50 ppm/°C temperature coefficient (Y-suffix), and 1 Ω dynamic impedance. It operates over 10 μA to 20 mA current range and is rated for 0°C to 70°C ambient, making it suitable for battery-powered precision analog circuits including portable meters and low-power thermometers.
For engineers reviewing the LM385BYM-1.2/NOPB datasheet, LM385BYM-1.2/NOPB pinout, LM385BYM-1.2/NOPB application, or LM385BYM-1.2/NOPB equivalent, key selection criteria include its tight initial tolerance, low operating current capability down to 10 μA, SOIC-8 package compatibility with automated assembly, and verified performance in micropower current-source and cold-junction compensation topologies.
Technical Context
The LM385BYM-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors, enabling low noise (60 μVrms, 10 Hz–10 kHz) and excellent long-term stability (20 ppm/1000 hr). Its 2-terminal configuration simplifies layout and eliminates external biasing components.
Designed for operation across a wide reverse current range (10 μA–20 mA), it maintains stable regulation under varying supply conditions and exhibits exceptional tolerance to capacitive loading-enabling direct use with ADC reference inputs or op-amp feedback networks without stability compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures minimal calibration burden in precision measurement systems. |
| Initial Tolerance | ±1% at 25°C; specified for LM385BYM-1.2/NOPB per Electrical Characteristics table (Y-suffix grade). |
| Temp Coefficient | 50 ppm/°C (Y-suffix); maximum average drift over 0°C–70°C enables <±0.35 mV variation across full operating range. |
| Dynamic Impedance | 1 Ω at 100 μA; ensures minimal load-induced voltage shift in high-impedance sensing or feedback paths. |
| Operating Current | 10 μA to 20 mA; supports ultra-low-power applications (e.g., 1.5 V battery reference) while retaining regulation integrity. |
| Long-Term Stability | 20 ppm/1000 hr; guarantees predictable reference drift in field-deployed instrumentation requiring multi-year accuracy. |
| Noise (10 Hz–10 kHz) | 60 μVrms; low broadband noise preserves signal integrity in high-resolution ADC references and precision comparators. |
Pinout & Package
LM385BYM-1.2/NOPB is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012 variation AA), 3.91 mm × 4.90 mm footprint, 1.75 mm max height, RoHS-compliant with Sn lead finish and MSL Level-1 rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode (Cathode connection point) | Internally connected to reference output node; must be tied to system ground or negative rail in standard 2-terminal configuration. |
| Pin 2 | Cathode (Anode connection point) | Reference output terminal; delivers regulated 1.235 V when reverse-biased with 10 μA–20 mA current. |
| Pins 3–8 | NC / Die Attach Pad | Not electrically connected; Pin 3 is attached to die attach pad and may be left floating or connected to Pin 2 per TI Figure 3 guidance. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | Functional down to 10 μA reverse current-enables direct use with 1.5 V alkaline cells and ultra-low-quiescent regulators. |
| Capacitive load immunity | No external compensation required up to ≥1 μF; simplifies PCB layout in noisy environments or high-ESR supply rails. |
| Low dynamic impedance | 1 Ω at 100 μA ensures <100 μV output shift under 100 μA load transients-critical for stable ADC reference buffers. |
| On-chip trimming | Laser-trimmed band-gap core achieves ±1% initial accuracy without external calibration components or post-manufacture adjustment. |
| Wide temperature range | Rated for 0°C to 70°C operation-validated for commercial industrial equipment, portable test gear, and embedded sensor nodes. |
Applications
| Portable Digital Multimeter Reference | 0°C–100°C Precision Thermometer |
|---|---|
Use Scenario: Battery-powered handheld DMM requiring stable 1.235 V reference for 3½-digit ADC conversion. IC Role / Device Role / Timing Role: 2-terminal voltage reference providing excitation and scaling for analog front-end and digitization path. Use Value: Enables ±0.5% full-scale accuracy with no warm-up drift and <30 μA total quiescent current draw from 9 V battery. |
Use Scenario: Centigrade thermometer using LM385BYM-1.2/NOPB in Figure 26 topology with thermistor bridge. IC Role / Device Role / Timing Role: Precision voltage source establishing Kelvin-per-millivolt scaling for linearized temperature readout. Use Value: Delivers <±0.2°C linearity error over full range due to 50 ppm/°C tempco and 20 ppm/1000 hr stability. |
| Micropower Cold-Junction Compensator | Low-Voltage Current Source |
Use Scenario: Thermocouple interface circuit compensating for ambient junction temperature in industrial data loggers. IC Role / Device Role / Timing Role: Stable reference generating offset voltage proportional to absolute temperature (1 mV/K) for K/J/T-type thermocouples. Use Value: Achieves <±1°C cold-junction accuracy at 25°C with typical 50 μA supply current-extending battery life beyond 2 years. |
Use Scenario: Programmable 1 μA–1 mA current source for sensor excitation in gas detection or pH monitoring modules. IC Role / Device Role / Timing Role: Precision voltage reference setting gain in op-amp-based Howland current pump. Use Value: Ensures <±0.5% current accuracy over temperature and supply variations due to 1 Ω dynamic impedance and low noise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM385BM-1.2/NOPB | ±2% initial tolerance, 150 ppm/°C tempco (standard grade), same SOIC-8 package and 0°C–70°C range. | Lower accuracy; suitable for non-critical biasing or coarse calibration where cost is prioritized over precision. | Select LM385BM-1.2/NOPB only if ±2% tolerance and higher drift are acceptable in your reference chain. |
| REF3012AIDBZR | 1.2 V output, ±0.2% initial tolerance, 50 ppm/°C, SOT-23-3 package, 50 μA typical quiescent current. | Higher initial accuracy but higher minimum operating current; not drop-in compatible due to 3-pin architecture and different pinout. | Choose REF3012AIDBZR when sub-0.5% accuracy is mandatory and board space allows SOT-23 rework. |
Compared with LM385BYM-1.2/NOPB, LM385BM-1.2/NOPB trades ±1% tolerance and 50 ppm/°C stability for lower cost, while REF3012AIDBZR offers superior accuracy but requires redesign for 3-terminal operation and higher supply current-making LM385BYM-1.2/NOPB optimal for cost-sensitive, ultra-low-power 2-terminal reference needs.
Availability
LM385BYM-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and industrial temperature monitoring requiring stable component supply with guaranteed long-term availability and consistent parametric performance.
Supply support for LM385BYM-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 reference design and high-reliability manufacturing.
The LM385 series was developed to deliver robust, low-power 2-terminal voltage references for portable and space-constrained applications-emphasizing micropower operation, capacitive-load immunity, and long-term stability without external components.
FAQ
What is the exact reference voltage and tolerance of LM385BYM-1.2/NOPB?
The LM385BYM-1.2/NOPB provides a nominal reference voltage of 1.235 V with a guaranteed ±1% initial tolerance at 25°C, as confirmed in the Electrical Characteristics table for the Y-suffix variant. This tolerance is production-tested and applies across the full 0°C to 70°C operating range, ensuring predictable performance in calibrated measurement systems without post-installation trimming.
Can LM385BYM-1.2/NOPB operate from a 1.5 V battery?
Yes, LM385BYM-1.2/NOPB can operate from a 1.5 V battery-as shown in Figure 16 of the datasheet-because its minimum operating current is only 10 μA and its forward voltage drop remains within specification at low bias. At 10 μA, the device regulates stably with <100 mV headroom, making it ideal for single-cell alkaline or lithium primary battery applications.
What is the temperature coefficient of LM385BYM-1.2/NOPB and how is it defined?
The LM385BYM-1.2/NOPB has a maximum average temperature coefficient of 50 ppm/°C (Y-suffix grade), defined as the peak deviation of output voltage across the full 0°C to 70°C range divided by the temperature span. This results in ≤0.35 mV total drift over operating temperature-verified per the "Average Temperature Coefficient" test condition in the Electrical Characteristics table.
Is LM385BYM-1.2/NOPB pin-compatible with other LM385 variants in SOIC-8?
Yes, LM385BYM-1.2/NOPB shares identical SOIC-8 pinout (Package Drawing D) and footprint with all LM385-xM and LM385-xMX variants-including LM385BM-1.2/NOPB and LM385BXM-1.2/NOPB-enabling direct substitution in existing layouts without PCB modification, provided thermal and accuracy requirements align.
Does LM385BYM-1.2/NOPB require external capacitors for stability?
No, LM385BYM-1.2/NOPB does not require external capacitors for stability. Its band-gap architecture and internal compensation provide inherent immunity to capacitive loading up to at least 1 μF, as explicitly stated in the Features section and validated in typical performance curves-eliminating need for output bypass caps in most reference and current-source applications.
LM385BYM-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- 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:
- 15 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LM385BYM-1.2/NOPB FAQ
1.How can I place an order for LM385BYM-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYM-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 LM385BYM-1.2/NOPB reliable?
The price and inventory of LM385BYM-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 LM385BYM-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYM-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYM-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BYM-1.2/NOPB?
LM385BYM-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYM-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 LM385BYM-1.2/NOPB?
For technical support, including LM385BYM-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYM-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BYM-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYM-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 LM385BYM-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYM-1.2/NOPB?
All LM385BYM-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYM-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 LM385BYM-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BYM-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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