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Texas Instruments LM385BYZ-1.2/NOPB
- Part No.:
- LM385BYZ-1.2/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BYZ-1.2/NOPB.pdf
- Description:
- IC VREF SHUNT 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
LM385BYZ-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 across 10 μA–20 mA operating current. It serves as a stable low-voltage reference in battery-powered analog circuits, portable meters, and precision current sources.
For engineers reviewing the LM385BYZ-1.2/NOPB datasheet, LM385BYZ-1.2/NOPB pinout, LM385BYZ-1.2/NOPB application, or LM385BYZ-1.2/NOPB equivalent, key selection criteria include its TO-92 package, 0°C to 70°C industrial temperature range, low 10 μA minimum operating current, and compatibility with capacitive loads up to 10 nF without instability.
Technical Context
The LM385BYZ-1.2/NOPB implements a band-gap reference architecture using on-chip trimmed transistors and resistors to achieve tight voltage accuracy and long-term stability. Its two-terminal configuration simplifies integration into bias networks and current-source topologies without external feedback components.
Designed for micropower operation, it maintains regulation down to 10 μA quiescent current and exhibits low wideband noise (60 μVrms, 10 Hz–10 kHz) and excellent load regulation-voltage change ≤1 mV over 10 μA–1 mA and ≤20 mV over 1 mA–20 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage | 1.235 V nominal; tight ±1% initial tolerance ensures minimal calibration overhead in precision analog systems. |
| Temperature Coefficient | 50 ppm/°C (Y-suffix); enables stable reference performance across 0°C–70°C without external compensation. |
| Dynamic Impedance | 1 Ω at 100 μA; provides high PSRR and low output impedance for driving moderate capacitive loads. |
| Operating Current Range | 10 μA to 20 mA; supports ultra-low-power sensor interfaces and high-current reference buffers in same device family. |
| Reverse Breakdown Voltage Change | ≤1 mV (10 μA–1 mA) and ≤20 mV (1 mA–20 mA); ensures predictable regulation under varying load conditions. |
| Long-Term Stability | 20 ppm over 1000 hours; reduces drift-related recalibration needs in field-deployed instrumentation. |
Pinout & Package
LM385BYZ-1.2/NOPB is housed in a 3-pin TO-92 plastic package (LP drawing), with leads formed for through-hole mounting. Pin 1 is anode, Pin 2 is cathode, and Pin 3 is internally connected to the die attach pad and may be left floating or tied to Pin 2 per layout requirements.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connects to lower-potential node (e.g., ground or current sink); reverse-biased operation requires current into this terminal. |
| Pin 2 | Cathode | Output reference node; delivers regulated 1.235 V relative to Pin 1 when reverse current flows from Pin 2 to Pin 1. |
| Pin 3 | Die Attach Pad | Internally bonded to substrate; electrically tied to Pin 2 in TO-92 variant-may be left unconnected or shorted to Pin 2 for thermal or mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive Load Tolerance | Stable with ≥10 nF capacitance-enables direct decoupling without series resistance or isolation. |
| Micropower Operation | Functional down to 10 μA supply current-extends battery life in portable multimeters and IoT sensor nodes. |
| Low Noise Performance | 60 μVrms (10 Hz–10 kHz)-minimizes added noise in high-resolution ADC reference paths. |
| On-Chip Trimming | ±1% initial voltage tolerance achieved via laser trimming-reduces post-manufacture calibration effort. |
Applications
| Portable Multimeter Reference | Precision 1–1000 μA Current Source |
|---|---|
Use Scenario: Used as the primary voltage reference in handheld digital multimeters requiring stable 3½- to 4½-digit accuracy over battery discharge cycles. IC Role / Device Role / Timing Role: Two-terminal shunt reference providing fixed 1.235 V reference for ADC input scaling and autoranging circuitry. Use Value: Enables <10 ppm/°C system-level drift and eliminates need for external trim pots due to ±1% factory tolerance. | Use Scenario: Configured with external resistor to generate highly stable bias currents for op-amp input stages or sensor excitation in medical diagnostics equipment. IC Role / Device Role / Timing Role: Precision voltage source enabling accurate current mirroring via Ohm's Law (IOUT = VREF/R). Use Value: Delivers <0.02% current accuracy over 0°C–70°C thanks to 50 ppm/°C tempco and 1 Ω dynamic impedance. |
| Low-Voltage Battery Monitor | Micropower Thermocouple Compensator |
Use Scenario: Monitors 1.5 V alkaline or NiMH cell voltage in wearables, triggering low-battery alerts before cutoff. IC Role / Device Role / Timing Role: Shunt reference establishing threshold voltage for comparator-based battery health detection. Use Value: Draws only 10 μA standby current-preserves >95% of shelf life in devices powered by single-cell batteries. | Use Scenario: Provides cold-junction compensation voltage in thermocouple measurement circuits for HVAC and industrial process control. IC Role / Device Role / Timing Role: Stable 1.235 V reference generating Kelvin-proportional offset voltage to cancel thermocouple ambient-temperature error. Use Value: Achieves <0.5°C total error over 0°C–70°C due to matched tempco and low long-term drift (20 ppm/1000 h). |
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/NOPB | Same TO-92 package and 0°C–70°C rating, but ±2% initial tolerance and 150 ppm/°C tempco (standard grade). | Suitable for cost-sensitive applications where tighter accuracy is not required, e.g., non-critical power supply monitoring. | Select LM385BYZ-1.2/NOPB when ±1% tolerance and 50 ppm/°C stability are mandatory for metrology-grade designs. |
| TLVH431ACDBVR | 3-terminal adjustable shunt reference (2.5 V base), SOT-23 package, 1% tolerance, 50 ppm/°C, but requires external resistors for 1.235 V setting. | Used where programmability or higher output voltage flexibility is needed; not drop-in compatible due to 3-pin topology and different biasing. | Choose TLVH431ACDBVR only if design allows rework for 3-terminal configuration and accepts added component count for voltage adjustment. |
Compared with LM385BZ-1.2/NOPB, LM385BYZ-1.2/NOPB delivers twice the initial accuracy and one-third the temperature drift-critical for portable instrumentation. Versus TLVH431ACDBVR, it offers true 2-terminal simplicity and guaranteed 1.235 V output without resistor matching errors, though at the cost of adjustability.
Availability
LM385BYZ-1.2/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, battery-powered sensors, and precision analog front-ends requiring stable component supply with consistent parametric performance across production lots.
Supply support for LM385BYZ-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, embedded processing, and connectivity technologies with over 90 years of innovation in precision analog ICs.
The LM385 series was designed specifically for micropower, low-voltage reference applications in portable and battery-constrained systems-emphasizing ultra-low quiescent current, robust capacitive loading immunity, and industrial-temperature reliability.
FAQ
What is the exact reference voltage and tolerance of LM385BYZ-1.2/NOPB?
The LM385BYZ-1.2/NOPB delivers a nominal reference voltage of 1.235 V with a guaranteed ±1% initial tolerance at 25°C. This specification is production-tested and applies across the full 10 μA–20 mA operating current range, ensuring predictable performance without post-installation trimming in most applications.
Can LM385BYZ-1.2/NOPB operate from a 1.5 V battery?
Yes, LM385BYZ-1.2/NOPB can operate directly from a 1.5 V alkaline cell. Its minimum operating current is 10 μA, and with a 1.235 V reference voltage, it functions reliably even as the battery discharges to ~1.3 V-making it ideal for Figure 16 and Figure 23 circuits in the official TI datasheet.
What is the temperature coefficient of LM385BYZ-1.2/NOPB and how is it specified?
LM385BYZ-1.2/NOPB has a maximum average temperature coefficient of 50 ppm/°C, designated by the "Y" suffix. This value is defined as the peak deviation of output voltage across the full 0°C to 70°C operating range, divided by the temperature span-verified per TI's test methodology in SNVS742E.
Is LM385BYZ-1.2/NOPB compatible with capacitive loads, and what is the maximum recommended value?
Yes, LM385BYZ-1.2/NOPB is explicitly designed for capacitive load tolerance. The datasheet confirms stable operation with ≥10 nF capacitance on the cathode node-no series resistor or isolation is required, simplifying layout in noise-sensitive applications like ADC references.
How does the TO-92 pinout of LM385BYZ-1.2/NOPB differ from SOIC variants in the LM385-1.2 family?
LM385BYZ-1.2/NOPB uses a 3-pin TO-92 package (LP drawing) with Pin 1 = anode, Pin 2 = cathode, and Pin 3 = die attach pad (internally tied to Pin 2). In contrast, SOIC variants (e.g., LM385BYM-1.2/NOPB) use an 8-pin SOIC (D package) with Pins 1–3 unused-only Pins 4 (anode) and 5 (cathode) are functional, making them physically and electrically incompatible despite shared electrical specs.
LM385BYZ-1.2/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Series:
- -
- Packaging:
- Bulk
- 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:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM385BYZ-1.2/NOPB FAQ
1.How can I place an order for LM385BYZ-1.2/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYZ-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 LM385BYZ-1.2/NOPB reliable?
The price and inventory of LM385BYZ-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 LM385BYZ-1.2/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYZ-1.2/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYZ-1.2/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM385BYZ-1.2/NOPB?
LM385BYZ-1.2/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYZ-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 LM385BYZ-1.2/NOPB?
For technical support, including LM385BYZ-1.2/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYZ-1.2/NOPB requirements.
6.How does Aetrix verify that LM385BYZ-1.2/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYZ-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 LM385BYZ-1.2/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYZ-1.2/NOPB?
All LM385BYZ-1.2/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYZ-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 LM385BYZ-1.2/NOPB part is unused and in its original packaging.
Return procedure for LM385BYZ-1.2/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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