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LE12CZ
STMicroelectronics
IC REG LINEAR 1.25V 100MA TO92-3
3467 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA TO-92-3
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5.0 / 5.0
- (267 Ratings)
LE12CZ
Product Overview
8178187
DiGi Electronics Part Number
LE12CZ-DGManufacturer
STMicroelectronics
LE12CZ
Description
IC REG LINEAR 1.25V 100MA TO92-3Inventory
3467 Pcs New Original In Stock
Linear Voltage Regulator IC Positive Fixed 1 Output 100mA TO-92-3
Quantity
Minimum 1
Minimum 1
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LE12CZ Technical Specifications
Category
Power Management (PMIC), Voltage Regulators - Linear, Low Drop Out (LDO) Regulators
Packaging
-
Series
-
Product Status
Obsolete
Output Configuration
Positive
Output Type
Fixed
Number of Regulators
1
Voltage - Input (Max)
18V
Voltage - Output (Min/Fixed)
1.25V
Voltage - Output (Max)
-
Voltage Dropout (Max)
0.5V @ 100mA
Current - Output
100mA
Current - Quiescent (Iq)
1 mA
Current - Supply (Max)
3 mA
PSRR
82dB ~ 60dB (120Hz ~ 10kHz)
Control Features
-
Protection Features
Over Current, Over Temperature
Operating Temperature
-40°C ~ 125°C
Mounting Type
Through Hole
Package / Case
TO-226-3, TO-92-3 (TO-226AA)
Supplier Device Package
TO-92-3
Base Product Number
LE12
Datasheet & Documents
Datasheets
Download LE12CZ Product Specification (PDF)
HTML Datasheet
LE12CZ-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
1 (Unlimited)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Standard Package
2,500
Reviews
5.0/5.0-(Show up to 5 Ratings)
December 02, 2025
Une équipe attentive et un tarif clair, que demander de plus ?
December 02, 2025
Di Digi Electronics offers a superb combination of durability, quality, and price.
December 02, 2025
I always feel confident shopping here due to their transparent and user-friendly website.
December 02, 2025
Their prices are unbeatable in the market, allowing me to manage my project budget effectively.
December 02, 2025
Their delivery system is highly efficient, and I appreciate the punctuality regardless of the order size.
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Frequently Asked Questions (FAQ)
What are the key design risks when using the LE12CZ linear regulator in a high-temperature industrial environment, and how can thermal derating impact long-term reliability?
The LE12CZ has an operating temperature range of -40°C to 125°C, but its junction temperature must not exceed 125°C. In high-ambient environments (e.g., >85°C), power dissipation (Pd = (Vin - Vout) × Iout) can push the junction temperature beyond safe limits due to limited TO-92 package thermal resistance (~200°C/W). Without a heatsink, even modest loads at elevated Vin can cause thermal shutdown or accelerated aging. To mitigate risk, reduce input voltage, limit output current, or consider a surface-mount regulator with better thermal performance like the MCP1700T-1202E/TT (SOT-23, lower θJA) for space-constrained high-temp designs.
Can the LE12CZ be safely replaced with the LM1117-1.2 in a legacy through-hole design, and what layout or stability concerns should I anticipate?
While the LM1117-1.2 offers similar 1.2V output and 800mA capability, direct replacement of the LE12CZ is not recommended without design review. The LM1117 requires an output capacitor (typically 10µF tantalum or 22µF ceramic) for stability, whereas the LE12CZ is internally compensated and may oscillate with large external capacitors. Additionally, the LM1117 has a higher dropout voltage (~1.2V vs. 0.5V for LE12CZ), reducing efficiency in low-headroom applications. If replacing, verify capacitor compatibility and ensure Vin does not exceed 15V to avoid exceeding the LM1117’s absolute maximum rating.
How does the LE12CZ’s low quiescent current (1mA) benefit battery-powered applications, and what trade-offs exist compared to modern ultra-low-Iq alternatives like the TPS79912?
The LE12CZ’s 1mA quiescent current is relatively low for a through-hole linear regulator and helps extend battery life in always-on systems like remote sensors or metering equipment. However, modern alternatives such as the TPS79912 (25µA Iq, SOT-23) offer 40x lower quiescent current, significantly improving efficiency in microamp-level sleep modes. The trade-off is package and integration: the LE12CZ’s TO-92 form factor simplifies prototyping and hand-soldering, while the TPS79912 requires SMT assembly. For new low-power designs, consider migrating to SMD regulators, but the LE12CZ remains viable for legacy or low-complexity systems where ultra-low Iq isn’t critical.
What input voltage conditions pose the greatest risk of failure for the LE12CZ, and how can transient spikes or reverse polarity affect its reliability despite built-in protections?
The LE12CZ tolerates up to 18V input, but sustained operation near this limit—especially with high load current—increases power dissipation and thermal stress. More critically, voltage transients (e.g., from inductive loads or hot-plugging) exceeding 18V can damage the IC despite over-temperature and over-current protections. Reverse polarity connection will likely destroy the device instantly, as it lacks reverse-battery protection. To protect the LE12CZ, add a series Schottky diode for reverse polarity and a TVS diode or input Zener clamp (e.g., 15V Zener) to suppress transients, especially in automotive or industrial environments.
Given that the LE12CZ is marked as obsolete, what are the best strategies for sourcing reliable replacements or managing end-of-life risk in existing product lines?
Since the LE12CZ is obsolete, long-term supply risk is high despite current stock availability. Recommended strategies include: (1) qualify a drop-in functional equivalent such as the MC78L12 (12V version not suitable—avoid confusion) or better, the NCV5501DT12RKG (1.2V, 150mA, DPAK, automotive-grade), which offers higher current and modern packaging; (2) redesign with a pin-compatible SMD alternative like the AP2112K-1.2TRG1 (1.2V, 600mA, SOT-23-5) if board space allows; (3) secure last-time buy inventory with full traceability and batch testing. Always validate replacement candidates under real operating conditions, especially for PSRR, noise, and transient response, to avoid unintended system behavior.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LE12CZ CAD Models
STMicroelectronics LE12CZ PCB symbols & footprints
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