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onsemi LM317LBZRA
- Part No.:
- LM317LBZRA
- Manufacturer:
- onsemi
- Package:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Datasheet:
-
LM317LBZRA.pdf
- Description:
- IC REG LINEAR POS ADJ 100MA TO92
- Quantity:
- Payment:
- Shipping:
Inventory:4,832
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Product details
Overview
LM317LBZRA from onsemi is a 3-terminal adjustable positive voltage regulator delivering ≥100 mA across 1.2 V to 37 V output range, featuring internal thermal shutdown, short-circuit current limiting, and safe-area compensation. It operates as a floating regulator in local on-card power regulation, precision current source, or programmable voltage supply for industrial control and sensor interface circuits.
For engineers reviewing the LM317LBZRA datasheet, pinout, applications, or equivalent options, key selection criteria include its TO-92 package compatibility, 1.25 V reference voltage tolerance, ≤100 µA adjustment pin current, and guaranteed operation from −40°C to +125°C per AEC-Q100 requirements.
Technical Context
The LM317LBZRA implements a floating linear regulator architecture with a precision 1.25 V bandgap reference between output and adjust terminals. Its feedback loop uses external resistors R1 (240 Ω typical) and R2 to set VOUT = 1.25 V × (1 + R2/R1) + IADJR2, where IADJ is controlled to ≤100 µA.
It integrates protection circuitry including thermal overload shutdown at 180°C junction temperature, foldback current limiting, and safe-area compensation for SOA compliance under varying load and input conditions. The device requires no output capacitor for stability but benefits from CADJ = 10 µF for improved ripple rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ≥100 mA continuous; supports local regulation without heatsink up to 625 mW dissipation in TO-92. |
| Output Voltage Range | 1.2 V to 37 V; set by two external resistors with minimal error from IADJ ≤100 µA. |
| Reference Voltage | 1.20–1.30 V (min–max); enables ±4% initial output accuracy before resistor tolerance effects. |
| Line Regulation | 0.01–0.07 %/V; maintains stable output despite input voltage changes from 3.0 V to 40 V differential. |
| Load Regulation | ≤0.5% VOUT or ≤25 mV; ensures tight voltage control across 10 mA to 100 mA load range. |
| Junction Temp Range | −40°C to +125°C; qualified to AEC-Q100 for automotive under-hood and industrial environments. |
| Ripple Rejection | 60–80 dB at 120 Hz; suppresses AC line noise when CADJ = 10 µF is used at adjust pin. |
Pinout & Package
LM317LBZRA is housed in a Pb-free TO-92 package (Case 29), with bent leads and tape-and-reel shipping format (ZRA suffix). Thermal resistance is RJA = 160°C/W at TA = 25°C, requiring minimal PCB copper for low-power applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Adjust | Reference node input | Connects to voltage divider midpoint; senses 1.25 V reference; draws ≤100 µA for minimal error term. |
| 2 - VOUT | Regulated output | Delivers stabilized voltage; supplies all load current plus quiescent current returned to this pin. |
| 3 - VIN | Unregulated input | Accepts 2.5 V to 40 V above VOUT; must maintain ≥3 V headroom for regulation. |
Key Features
| Feature | Design Value |
|---|---|
| Floating regulator topology | Enables high-side or floating configurations-e.g., 48 V bias supply referenced to non-ground nodes. |
| Internal safe-area compensation | Prevents secondary breakdown during transient overloads without external SOA protection components. |
| Thermal shutdown at 180°C | Self-protects against sustained overload or poor heatsinking; resumes operation after cooldown. |
| Adjust pin current ≤100 µA | Reduces resistor-divider error to <0.1% in typical 10 mA–100 mA applications using 240 Ω/1.65 kΩ. |
| AEC-Q100 qualified (NCV variant) | LM317LBZRA shares NCV317LB qualification-guaranteed −40°C to +125°C operation with PPAP support. |
Applications
| Industrial Sensor Power Supply | Programmable Bench Power Source |
|---|---|
|
Use Scenario: Providing stable 5 V or 12 V bias to analog sensors (e.g., pressure transducers, RTDs) in PLC I/O modules. IC Role / Device Role / Timing Role: Local linear regulator delivering low-noise, ripple-free DC from 24 V bus; acts as precision voltage reference source. Use Value: Eliminates need for multiple fixed-voltage regulators; maintains ±1% output accuracy over temperature with 240 Ω/1.2 kΩ divider. |
Use Scenario: Adjustable lab-grade power supply with front-panel potentiometer for variable output (1.2–30 V) and current limit. IC Role / Device Role / Timing Role: Core voltage-setting element; configured as adjustable regulator with external R1/R2 and current-sense resistor. Use Value: Enables precise, low-drift output using 1% metal-film resistors; 0.01%/V line regulation prevents drift during AC mains fluctuations. |
| Automotive ECU Sub-Regulator | LED Constant-Current Driver |
|
Use Scenario: Generating 3.3 V or 5 V for microcontroller peripherals in engine control units exposed to −40°C cold cranking and 125°C under-hood heat. IC Role / Device Role / Timing Role: Secondary regulator downstream of main 5 V rail; provides isolated, low-noise domain for ADC and CAN transceivers. Use Value: AEC-Q100 qualification ensures reliability; thermal shutdown prevents latch-up during transient overloads in start-stop cycles. |
Use Scenario: Driving 1–3 high-brightness LEDs in signage or indicator panels with consistent luminance across input voltage variation. IC Role / Device Role / Timing Role: Precision current regulator via fixed resistor between adjust and output pins; sets ILED = 1.25 V / RSET. Use Value: Delivers ±3% current accuracy over temperature; eliminates LED brightness shift due to Vf drift or supply ripple. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable positive voltage regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LZG | Same TO-92 package and electrical specs, but rated for 0°C to +125°C (not automotive-grade). | Lacks AEC-Q100 qualification and −40°C low-temp guarantee; unsuitable for automotive cold-start environments. | Select LM317LZG only for commercial-grade applications where extended temperature range is not required. |
| TLV1117-ADJ | Lower dropout (1.2 V), 800 mA output, SOT-223 package; reference voltage 1.25 V ±1.5%. | Higher current capability but limited max output voltage (15 V); no floating operation support. | Choose TLV1117-ADJ when higher current and lower dropout are critical, and 15 V max output suffices. |
Compared with LM317LZG, LM317LBZRA adds guaranteed −40°C operation and automotive qualification; compared with TLV1117-ADJ, it offers wider output range (up to 37 V) and true floating configuration, at the cost of lower current and higher dropout.
Availability
LM317LBZRA is available at Aetrix Electronics and suitable for industrial sensor power supplies, automotive ECU sub-regulators, and programmable bench power sources requiring stable component supply with long-term lifecycle assurance.
Supply support for LM317LBZRA 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
onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power management, analog, and sensing solutions for automotive, industrial, and cloud infrastructure markets.
The LM317L family was designed for robust, low-cost adjustable voltage regulation in space-constrained and thermally demanding applications-emphasizing fault resilience, wide temperature operation, and minimal external component count.
FAQ
What is the maximum input-to-output voltage differential supported by the LM317LBZRA?
The LM317LBZRA supports a maximum input-to-output voltage differential of 40 VDC. This allows operation with input voltages up to 40 V above the regulated output-for example, 45 V input regulating 5 V output. Exceeding this rating risks permanent damage, as specified in the Absolute Maximum Ratings table of the official datasheet.
Does the LM317LBZRA require an output capacitor for stability?
No, the LM317LBZRA is internally compensated and remains stable without an output capacitor. However, adding a 1.0 µF tantalum or 25 µF aluminum electrolytic capacitor improves transient response and suppresses ringing caused by certain PCB trace impedances or load capacitance interactions.
Can the LM317LBZRA be used as a constant-current source?
Yes, the LM317LBZRA can function as a precision constant-current source by connecting a single resistor between the adjust and output pins. In this configuration, load current equals 1.25 V divided by the resistor value (IOUT = 1.25 V / RSET), with accuracy maintained across its full operating temperature range.
What is the purpose of the adjustment pin current specification in the LM317LBZRA datasheet?
The adjustment pin current (IADJ) of ≤100 µA directly impacts output voltage accuracy in resistor-divider configurations. Since IADJ flows through R2, it introduces an error term in VOUT = 1.25 V × (1 + R2/R1) + IADJR2-making low-value R2 selections critical for minimizing this offset in high-precision designs.
How does the LM317LBZRA differ from the standard LM317L in terms of qualification and temperature range?
The LM317LBZRA is the automotive-grade variant of the LM317L, qualified to AEC-Q100 with guaranteed operation from −40°C to +125°C. Standard LM317L variants (e.g., LM317LZG) are rated only from 0°C to +125°C and lack PPAP documentation or site-specific automotive process controls.
LM317LBZRA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 Long Body, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 40V
- Voltage - Output (Min/Fixed):
- 1.2V
- Voltage - Output (Max):
- 37V
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92 (TO-226)
LM317LBZRA FAQ
1.How can I place an order for LM317LBZRA through Aetrix?
Please submit a Request for Quotation (RFQ) for LM317LBZRA 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 LM317LBZRA reliable?
The price and inventory of LM317LBZRA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM317LBZRA is usually 5 days.
3.What payment methods are accepted for LM317LBZRA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM317LBZRA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM317LBZRA?
LM317LBZRA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM317LBZRA 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 LM317LBZRA?
For technical support, including LM317LBZRA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM317LBZRA requirements.
6.How does Aetrix verify that LM317LBZRA is sourced from the original manufacturer or authorized distributors?
All LM317LBZRA 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 LM317LBZRA meets industry standards.
7.What is the process for return or replacement of LM317LBZRA?
All LM317LBZRA units undergo pre-shipment inspection (PSI). If there is an issue with LM317LBZRA, 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 LM317LBZRA part is unused and in its original packaging.
Return procedure for LM317LBZRA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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