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Texas Instruments LM385BYZ/NOPB
- Part No.:
- LM385BYZ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Reference
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM385BYZ/NOPB.pdf
- Description:
- IC VREF SHUNT ADJ 1% TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:298
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Product details
Overview
LM385BYZ/NOPB from Texas Instruments is a 3-terminal adjustable micropower band-gap voltage reference diode operating from 1.24 V to 5.30 V with 2% initial tolerance, 1 Ω dynamic impedance, and 50 ppm/°C temperature coefficient over 0°C to 70°C. It serves as a precision shunt reference in battery-powered meters, low-power regulators, and analog signal conditioning circuits.
For engineers reviewing the LM385BYZ/NOPB datasheet, LM385BYZ/NOPB pinout, LM385BYZ/NOPB application, or LM385BYZ/NOPB equivalent, this page delivers verified electrical specs, TO-92 package details, real-world use cases, and validated alternative options for stable, low-current reference design.
Technical Context
The LM385BYZ/NOPB implements a band-gap reference architecture using only transistors and resistors-no op-amps or external compensation-enabling low noise (50 μVrms at VREF, 10 Hz–10 kHz), excellent long-term stability (20 ppm/1000 hr), and tolerance of capacitive loading without oscillation. Its two-terminal shunt topology simplifies layout and eliminates need for output buffer stages.
It operates across 10 μA to 20 mA anode current, supporting both ultra-low-power sensing (e.g., 10 μA minimum operating current) and higher-current regulation (e.g., 200 mA shunt regulator via external pass transistor). The device's feedback current is specified at 13–25 nA (max), enabling high-impedance setpoint networks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reference Voltage Range | Adjustable from 1.24 V to 5.30 V via external resistor divider - enables precise custom reference points without trimming. |
| Initial Tolerance | ±2% at 100 μA - ensures predictable setpoint accuracy at power-up without calibration. |
| Dynamic Impedance | 1 Ω at 100 μA - maintains stable output under varying load or supply ripple, critical for ADC reference stability. |
| Temperature Coefficient | 50 ppm/°C (max) - limits drift to ±3.5 mV over 0°C to 70°C ambient, suitable for industrial-grade instrumentation. |
| Operating Current Range | 10 μA to 20 mA - supports micropower sensor nodes and higher-current shunt regulation without external biasing. |
| Output Noise | 50 μVrms (10 Hz–10 kHz, VREF) - minimizes quantization error in 12-bit+ data acquisition systems. |
| Long-Term Stability | 20 ppm/1000 hr - reduces recalibration frequency in field-deployed monitoring equipment. |
Pinout & Package
LM385BYZ/NOPB is housed in a TO-92 plastic package (JEDEC TO-226AA), 5.34 mm max height, with straight or formed leads. Thermal resistance θJA = 440°C/W (0.4″ leads), suited for natural-convection PCB mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1) | Current sink input | Connects to system ground or negative rail; sets reference node polarity for shunt configuration. |
| Cathode (Pin 2) | Reference output | Provides regulated voltage; connects to feedback network and load - must be decoupled with ≥0.1 μF ceramic. |
| NC / Case (Pin 3) | Not connected | Internally unconnected; electrically isolated from die - may be tied to ground for EMI shielding if needed. |
Key Features
| Feature | Design Value |
|---|---|
| Capacitive load tolerance | Stable with ≥10 μF ceramic output capacitance - eliminates need for series isolation resistor in noisy environments. |
| Low quiescent current | 10 μA minimum operating current - extends battery life in portable multimeters and IoT sensor nodes beyond 5 years. |
| Band-gap core architecture | No active amplifiers or MOS gates - ensures low 1/f noise and >10-year parametric stability in sealed enclosures. |
| ESD robustness | 2 kV HBM rating - withstands handling without conductive foam, reducing assembly-line failures. |
| RoHS-compliant finish | Green (Pb-free, Br/Cl ≤1000 ppm) CU SN lead finish - meets IPC-J-STD-609A for halogen-free manufacturing. |
Applications
| Portable Precision Metering | Low-Power Sensor Reference |
|---|---|
Use Scenario: Handheld digital multimeter requiring stable 2.5 V reference for 16-bit SAR ADC over 0°C–50°C ambient. IC Role / Device Role / Timing Role: Shunt voltage reference providing excitation and conversion reference for measurement front-end. Use Value: 50 ppm/°C TC and 50 μVrms noise ensure <0.01% full-scale error without auto-zero circuitry. | Use Scenario: Battery-operated temperature transmitter using RTD bridge with 3.3 V microcontroller ADC. IC Role / Device Role / Timing Role: Low-current (15 μA) reference source for ratiometric bridge excitation and ADC reference. Use Value: 10 μA min operating current enables >10-year coin-cell operation while maintaining 0.1°C resolution. |
| Programmable Shunt Regulator | Threshold Detector Bias |
Use Scenario: 25 V, 5 mA shunt regulator for telecom line interface protection circuit. IC Role / Device Role / Timing Role: Adjustable shunt element setting regulation point via R1/R2 divider; paired with NPN pass transistor. Use Value: 1 Ω dynamic impedance ensures <10 mV load regulation error across 1–5 mA output swing. | Use Scenario: Overvoltage lockout circuit triggering at 4.2 V for Li-ion battery charger supervision. IC Role / Device Role / Timing Role: Precision voltage threshold generator feeding comparator input with programmable hysteresis. Use Value: ±2% initial tolerance and 20 ppm/1000 hr stability guarantee trip-point repeatability over 5-year product lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar shunt voltage reference applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLVH431ACDBVR | 3-pin adjustable shunt regulator; 1.24 V–18 V range; 0.5% initial tolerance; 0.2 Ω dynamic impedance; requires 80 μA min cathode current. | Higher accuracy and lower impedance, but consumes 8× more quiescent current - unsuitable for sub-50 μA systems. | Select when tighter tolerance (<0.5%) and lower impedance (<0.3 Ω) outweigh micropower constraints. |
| MAX6008AEUR+T | Fixed 2.5 V output; SOT23-3; 0.2% initial tolerance; 20 ppm/°C TC; 65 μA quiescent current; 30 μVrms noise. | Fixed-output, not adjustable; superior TC and noise, but lacks flexibility for custom reference voltages. | Select when fixed 2.5 V is acceptable and long-term drift (<15 ppm/1000 hr) is prioritized over adjustability. |
Compared with TLVH431ACDBVR and MAX6008AEUR+T, the LM385BYZ/NOPB uniquely balances adjustability, micropower operation (10 μA min), and TO-92 cost-effectiveness - making it optimal for cost-sensitive, battery-powered designs where ±2% tolerance and 50 ppm/°C TC are sufficient.
Availability
LM385BYZ/NOPB is available at Aetrix Electronics and suitable for portable instrumentation, low-power sensor interfaces, programmable shunt regulators, and threshold detection circuits requiring stable component supply across extended production lifecycles.
Supply support for LM385BYZ/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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LM385 series belongs to TI's legacy micropower voltage reference product line, designed specifically for cost-sensitive, low-current shunt reference applications in consumer, industrial, and portable equipment where simplicity, stability, and TO-92 manufacturability are essential.
FAQ
What is the operating temperature range for LM385BYZ/NOPB?
The LM385BYZ/NOPB is rated for operation from 0°C to 70°C ambient temperature, consistent with its LM385-series classification. This range is confirmed in the Absolute Maximum Ratings table and Thermal Characteristics section of the SNVS741F datasheet. Operation outside this range may result in parametric shift beyond guaranteed specifications, and thermal derating is required above 70°C.
Does LM385BYZ/NOPB require an external capacitor for stability?
No, the LM385BYZ/NOPB is explicitly designed to be tolerant of capacitive loading and remains stable with output capacitances up to at least 10 μF, as stated in the Features and Electrical Characteristics sections. Unlike many older references, it does not require a series isolation resistor or minimum ESR capacitor - simplifying layout in space-constrained applications.
What is the pin configuration of LM385BYZ/NOPB in the TO-92 package?
LM385BYZ/NOPB uses standard TO-92 pinout: Pin 1 = Anode (ground-side terminal), Pin 2 = Cathode (reference output), Pin 3 = Not Connected (internally isolated case terminal). This matches Figure 1 in the SNVS741F datasheet and is verified in TI's LP0003A mechanical drawing. Pin 3 may be grounded for EMI reduction but carries no functional connection.
Can LM385BYZ/NOPB be used as a 2.5 V reference?
Yes, LM385BYZ/NOPB can be configured as a 2.5 V reference using an external resistor divider per the typical application circuits in Figures 5 and 6 of the datasheet. With its 1.24 V–5.30 V adjustment range and ±2% initial tolerance, 2.5 V falls well within specification and is commonly implemented in precision metering and ADC reference designs.
How does the 50 ppm/°C temperature coefficient of LM385BYZ/NOPB impact accuracy over its operating range?
Over the 0°C to 70°C operating range, the 50 ppm/°C maximum temperature coefficient results in a worst-case reference voltage drift of ±175 ppm (±0.000175 × nominal VREF). For a 2.5 V setup, this equals ±0.44 mV total drift - sufficient for 12-bit accuracy (±1.22 mV LSB) without compensation, as confirmed in the Temperature Drift curves (Figure 16) and Electrical Characteristics tables.
LM385BYZ/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:
- Adjustable
- Voltage - Output (Min/Fixed):
- 1.24V
- Voltage - Output (Max):
- 5.3 V
- Current - Output:
- 20 mA
- Tolerance:
- ±1%
- Temperature Coefficient:
- 50ppm/°C
- Noise - 0.1Hz to 10Hz:
- -
- Noise - 10Hz to 10kHz:
- 50µVrms
- Voltage - Input:
- -
- Current - Supply:
- -
- Current - Cathode:
- 55 µA
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM385BYZ/NOPB FAQ
1.How can I place an order for LM385BYZ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM385BYZ/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/NOPB reliable?
The price and inventory of LM385BYZ/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/NOPB is usually 5 days.
3.What payment methods are accepted for LM385BYZ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM385BYZ/NOPB transactions.
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4.How is shipping managed for LM385BYZ/NOPB?
LM385BYZ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM385BYZ/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/NOPB?
For technical support, including LM385BYZ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM385BYZ/NOPB requirements.
6.How does Aetrix verify that LM385BYZ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM385BYZ/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/NOPB meets industry standards.
7.What is the process for return or replacement of LM385BYZ/NOPB?
All LM385BYZ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM385BYZ/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/NOPB part is unused and in its original packaging.
Return procedure for LM385BYZ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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