My Inquiry
My Account
STMicroelectronics LM217LZ
,TO-226_straightlead.jpg)
- Part No.:
- LM217LZ
- Manufacturer:
- STMicroelectronics
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
LM217LZ.pdf
- Description:
- IC REG LIN POS ADJ 100MA TO92-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,482
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM217LZ from STMicroelectronics is a monolithic adjustable positive voltage regulator in TO-92 package, delivering up to 100 mA output current with 1.2–37 V adjustable output range, ±0.7% output voltage temperature stability, and built-in thermal overload and short-circuit protection. It serves as a floating regulator in low-power industrial power supplies and sensor biasing circuits.
For engineers reviewing the LM217LZ datasheet, LM217LZ pinout, LM217LZ application, or LM217LZ equivalent, key selection criteria include minimum load current (3.5–5 mA), reference voltage accuracy (1.2–1.3 V), line regulation (0.01% typ.), and TO-92 thermal resistance (200 °C/W).
Technical Context
The LM217LZ operates as a three-terminal floating linear regulator using an internal 1.25 V bandgap reference and precision error amplifier. Its quiescent current returns to the output terminal, requiring ≥3.5 mA minimum load to maintain regulation.
It features safe-area compensation for output transistors, enabling stable operation under transient overloads. The device supports remote sensing via proper R1/R2 placement and accepts external capacitors (e.g., 10 µF on ADJ-to-GND) to improve supply voltage rejection (up to 80 dB at 120 Hz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output voltage range | 1.2 to 37 V - set by external resistor divider; enables single BOM part across multiple output rails |
| Max output current | 100 mA - sufficient for low-power microcontrollers, op-amps, and sensors without heatsinking |
| Reference voltage (VREF) | 1.25 V (typ.) - defines base ratio for output setting; tolerance ±0.05 V impacts absolute output accuracy |
| Line regulation | 0.01 %/V (typ.) - ensures <±0.4 mV change per volt input variation at fixed load |
| Load regulation | 0.1 % (typ., VO ≥5 V) - guarantees ≤5 mV shift when load changes from 5 to 100 mA |
| Adjust pin current | 50–100 µA - introduces small error term (IADJ×R2) in output equation; must be accounted in precision designs |
| Thermal resistance (RthJA) | 200 °C/W (TO-92) - limits continuous power dissipation to ~375 mW at 25°C ambient without PCB copper heatsink |
Pinout & Package
LM217LZ is supplied in TO-92 plastic package (JEDEC TO-226AA), with leads formed for through-hole mounting and standard ammopack/bag packaging. Pin 1 (Adjust) sets output voltage via resistor divider; Pin 2 (Input) accepts unregulated DC; Pin 3 (Output) delivers regulated voltage.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Adjust) | Reference node for feedback network | Connected to junction of R1–R2 divider; 100 µA max current flows out, affecting high-R divider accuracy |
| Pin 2 (Input) | Unregulated DC supply input | Must exceed output by ≥3 V for regulation; max differential voltage = 40 V |
| Pin 3 (Output) | Regulated DC output terminal | Sinks all quiescent current; requires ≥3.5 mA minimum load to prevent voltage rise |
Key Features
| Feature | Design Value |
|---|---|
| Floating regulator architecture | Enables high-side or battery-ground-referenced configurations without level-shifting circuitry |
| Internal safe-area compensation | Prevents secondary breakdown during output short-circuit or thermal transients |
| Thermal overload protection | Shuts down output above 125°C junction temperature; auto-recovers after cooldown |
| Short-circuit protection | Limits output current to ~100 mA during sustained output-to-ground fault |
| Low-output-noise design | 0.003% RMS noise (10 Hz–10 kHz) supports analog sensor and precision reference applications |
Applications
| Industrial Sensor Biasing | Low-Power MCU Power Supply |
|---|---|
Use Scenario: Providing stable 3.3 V or 5 V bias to analog temperature/humidity sensors in factory-floor monitoring nodes. IC Role / Device Role / Timing Role: Adjustable linear regulator supplying clean, low-noise DC to sensor signal chain and ADC reference. Use Value: 0.003% output noise and ±0.7% tempco ensure sub-0.1% measurement drift over –40°C to +85°C operating range. | Use Scenario: Powering ARM Cortex-M0+ microcontrollers in battery-backed IoT edge devices with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Primary 3.3 V regulator sourcing 20–80 mA peak current during active mode; enters low-quiescent state between events. Use Value: 100 mA capability and 3.5 mA minimum load requirement align with typical MCU sleep-current profiles without auxiliary load resistors. |
| Programmable Current Source | High-Voltage Floating Reference |
Use Scenario: Generating precise 10–100 mA constant current for LED test fixtures or photodiode biasing. IC Role / Device Role / Timing Role: Configured as two-terminal current regulator using single resistor between ADJ and OUT pins. Use Value: 100 µA max IADJ and 1.25 V reference enable ±1% current accuracy with 1% R tolerance, no trimming required. | Use Scenario: Regulating +150 V output in high-voltage instrumentation front-ends where ground-referenced regulators cannot operate. IC Role / Device Role / Timing Role: Floating regulator referenced to output rail; only sees 40 V max differential (e.g., 150 V IN → 110 V OUT). Use Value: 40 V max VI–VO rating and TO-92 creepage clearance support safe operation at >100 V system potentials with appropriate PCB layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM317LZ | Same pinout and electrical specs, but rated for 0°C to 125°C junction range vs. LM217LZ's –40°C to 125°C | Not suitable for extended industrial or automotive cold-start environments below 0°C | Select LM217LZ for full industrial temperature range; LM317LZ acceptable for commercial-grade indoor use |
| TLV1117-33CKC | Fixed 3.3 V LDO (not adjustable); 800 mA output; 1.2 V dropout; no ADJ pin | Cannot replace LM217LZ in variable-output or current-source configurations | Use only if fixed 3.3 V and higher current are required; not a functional substitute for adjustable operation |
Compared with LM317LZ and TLV1117-33CKC, the LM217LZ uniquely supports –40°C operation, adjustable output, and current-regulator topology-making it irreplaceable in wide-temp, programmable, or floating-bias designs where LDOs or commercial-grade regulators fall short.
Availability
LM217LZ is available at Aetrix Electronics and suitable for industrial sensor biasing, low-power MCU power supply, programmable current source, and high-voltage floating reference applications requiring stable component supply and long-term lifecycle continuity.
Supply support for LM217LZ 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for industrial, automotive, and consumer markets.
The LM217LZ belongs to ST's legacy linear regulator product line, engineered for robustness, wide temperature operation, and ease of use in cost-sensitive, low-to-medium power analog systems.
FAQ
What is the minimum load current required for stable regulation with LM217LZ?
The LM217LZ requires a minimum load current of 3.5–5 mA to maintain output regulation. This arises because its quiescent current returns to the output pin; insufficient load causes voltage to rise beyond the set point. A 240 Ω resistor from OUT to GND satisfies this at 5 V output, and design must verify worst-case conditions across temperature and input voltage.
Can LM217LZ be used as a current regulator, and how is it configured?
Yes-LM217LZ can function as a precision two-terminal current regulator. Connect a single resistor R between the ADJ and OUT pins; output current equals 1.25 V / R. For example, R = 12.5 Ω yields 100 mA. The 100 µA max adjustment pin current introduces <1% error at R < 1 kΩ, making it suitable for LED drivers and sensor excitation.
What is the maximum allowable input-to-output voltage differential for LM217LZ?
The absolute maximum input-to-output differential voltage (VI–VO) for LM217LZ is 40 V. Exceeding this risks permanent damage regardless of power dissipation. In practice, design margin should keep VI–VO ≤35 V to accommodate transients and ensure reliability, especially in high-voltage floating applications like bias supplies for op-amps or photomultipliers.
How does LM217LZ differ from LM317LZ in terms of temperature specification?
The LM217LZ is specified for operation from –40°C to +125°C junction temperature, while the LM317LZ is rated only from 0°C to +125°C. Both share identical electrical characteristics and pinout, but LM217LZ is qualified for extended industrial and outdoor environments where sub-zero startup or storage is required-critical for infrastructure monitoring and automotive under-hood applications.
LM217LZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- 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):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB ~ 65dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-92-3
LM217LZ FAQ
1.How can I place an order for LM217LZ through Aetrix?
Please submit a Request for Quotation (RFQ) for LM217LZ 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 LM217LZ reliable?
The price and inventory of LM217LZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM217LZ is usually 5 days.
3.What payment methods are accepted for LM217LZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM217LZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM217LZ?
LM217LZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM217LZ 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 LM217LZ?
For technical support, including LM217LZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM217LZ requirements.
6.How does Aetrix verify that LM217LZ is sourced from the original manufacturer or authorized distributors?
All LM217LZ 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 LM217LZ meets industry standards.
7.What is the process for return or replacement of LM217LZ?
All LM217LZ units undergo pre-shipment inspection (PSI). If there is an issue with LM217LZ, 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 LM217LZ part is unused and in its original packaging.
Return procedure for LM217LZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM217LZ Tags
-
MIC5504-1.8YM5-TR
Microchip Technology
-
MIC5504-3.3YM5-TR
Microchip Technology
-
MIC5365-3.0YC5-TR
Microchip Technology
-
MIC5365-1.8YC5-TR
Microchip Technology
-
MIC5365-2.5YC5-TR
Microchip Technology
-
MIC5365-3.3YC5-TR
Microchip Technology
-
MIC5365-3.3YD5-TR
Microchip Technology
-
MIC5317-3.3YM5-TR
Microchip Technology
-
TLV1117LV33DCYR
Texas Instruments
-
MIC5317-3.3YMT-TZ
Microchip Technology
-
MIC5528-3.3YMT-TR
Microchip Technology
-
TLV75801PDRVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
