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Diodes Incorporated AS78L05Z-E1
- Part No.:
- AS78L05Z-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-226-3, TO-92-3 (TO-226AA)
- Datasheet:
-
AS78L05Z-E1.pdf
- Description:
- IC REG LINEAR 5V 100MA TO92
- Quantity:
- Payment:
- Shipping:
Inventory:33,184
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Product details
Overview
AS78L05Z-E1 from Diodes Incorporated is a fixed-output +5V, 100mA positive linear voltage regulator in TO-92 package with internal current limiting, thermal shutdown, and safe-area protection. It delivers stable local regulation for microprocessor power supplies and on-card applications with ±5% output voltage accuracy over –40°C to +125°C and dropout voltage of 1.7V at 40mA load.
For engineers reviewing the AS78L05Z-E1 datasheet, AS78L05Z-E1 pinout, AS78L05Z-E1 application, or AS78L05Z-E1 equivalent, key selection criteria include input voltage range (up to 30V), quiescent current (3–5.5mA), PSRR (47–62dB at 120Hz), output noise (40µV RMS), and thermal resistance (θJA = 180°C/W).
Technical Context
The AS78L05Z-E1 implements a monolithic series-pass regulator architecture with built-in short-circuit current limiting and thermal overload protection. Its internal safe-area compensation ensures reliable operation under sustained output overload without external components.
It operates across –40°C to +125°C junction temperature with input voltage support up to 30V for the 5V variant. The device requires only 0.33µF input and 0.1µF output capacitors for stability and achieves 84 ppm/°C output voltage temperature coefficient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0V ±5% (4.75–5.25V) over full temperature and load range - ensures compatibility with 5V logic and analog circuitry. |
| Max Output Current | 100mA - sufficient for low-power microcontrollers, sensors, and peripheral ICs without heatsinking. |
| Dropout Voltage | 1.7V at 40mA - enables operation from 6.7V minimum input, supporting wide-input legacy systems. |
| PSRR | 47–62dB at 120Hz - suppresses ripple from unregulated DC sources like rectified AC or switching pre-regulators. |
| Quiescent Current | 3–5.5mA - enables low standby power in always-on embedded subsystems. |
| Output Noise | 40µV RMS (10Hz–100kHz) - suitable for noise-sensitive analog circuits including ADC references and op-amp biasing. |
| Thermal Resistance θJA | 180°C/W (TO-92) - defines maximum power dissipation (750mW absolute max) and heatsink requirements. |
Pinout & Package
AS78L05Z-E1 uses the TO-92 (Z) package: 3-pin through-hole plastic case with standard lead configuration. Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (INPUT) | Unregulated DC Input | Accepts 7–30V DC; must be decoupled with ≥0.33µF capacitor close to pin for stability. |
| Pin 2 (GND) | Ground Reference | Common return path for input capacitor, output capacitor, and load; critical for noise control and regulation accuracy. |
| Pin 3 (OUTPUT) | Regulated +5V Output | Delivers up to 100mA; requires ≥0.1µF ceramic output capacitor for transient response and high-frequency noise suppression. |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated pass transistor, error amplifier, and feedback network eliminate need for external resistors or capacitors beyond basic decoupling. |
| Internal thermal shutdown | Automatically disables output when junction temperature exceeds ~150°C, preventing permanent damage during overload or poor heatsinking. |
| Short-circuit current limiting | Clamps output current to safe level (~120mA typical) during output-to-ground faults, enabling robust field operation. |
| Safe-area compensation | Prevents secondary breakdown of the internal pass transistor under simultaneous high voltage and high current stress conditions. |
| Lead-free and RoHS compliant | "E1" suffix indicates Diodes Incorporated's Pb-free construction meeting EU RoHS Directive 2011/65/EU requirements. |
Applications
| Microcontroller Power Supply | USB Peripheral Regulation |
|---|---|
|
Use Scenario: Providing clean 5V supply to 8-bit/32-bit MCUs (e.g., STM32F0, PIC16F) on compact PCBs where space prohibits switching regulators. IC Role / Device Role / Timing Role: Primary local voltage regulator delivering stable VDD for core logic, I/O, and internal peripherals. Use Value: Eliminates need for external feedback resistors or compensation networks while maintaining ±5% output tolerance across industrial temperature range. |
Use Scenario: Regulating 5V bus for USB 2.0 hubs, HID devices, or serial adapters powered from upstream host or wall adapter. IC Role / Device Role / Timing Role: Post-regulator ensuring compliance with USB specification's 4.75–5.25V VBUS tolerance under dynamic load changes. Use Value: Delivers 40µV RMS output noise and 62dB PSRR at 120Hz, suppressing ripple from noisy switch-mode adapters feeding the USB port. |
| Industrial Sensor Interface | Legacy System Board Replacement |
|
Use Scenario: Powering analog sensor signal chains (e.g., pressure transducers, RTD interfaces) in factory automation modules. IC Role / Device Role / Timing Role: Low-noise analog rail generator for precision ADC reference and op-amp biasing stages. Use Value: 40µV RMS broadband noise and 84 ppm/°C temperature coefficient enable sub-12-bit measurement accuracy without additional filtering. |
Use Scenario: Direct replacement for obsolete 78L05 variants in aging industrial control panels and telecom line cards. IC Role / Device Role / Timing Role: Pin-compatible drop-in substitute preserving existing PCB layout and bill-of-materials. Use Value: Matches legacy TO-92 footprint, electrical specs (VOUT, IMAX, dropout), and thermal behavior (θJA = 180°C/W), minimizing redesign effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MC78L05ACP | Same 5V/100mA spec but higher quiescent current (5.5–8mA) and lower PSRR (40dB @120Hz); TO-92 package. | Limited suitability for ultra-low-power or high-ripple environments due to higher IQ and reduced noise rejection. | Select when legacy Motorola footprint compatibility is mandatory and PSRR >45dB is not required. |
| TL78L05ACZ | Higher output accuracy (±2%) and lower dropout (1.3V @40mA), but no internal thermal shutdown; same TO-92 package. | Requires external thermal monitoring in high-ambient or high-load scenarios where safe-area protection is critical. | Choose for precision 5V rails where tighter initial tolerance outweighs need for integrated fault protection. |
Compared with MC78L05ACP and TL78L05ACZ, AS78L05Z-E1 uniquely balances integrated protection (thermal shutdown + safe-area), moderate PSRR (47–62dB), and RoHS-compliant construction-making it optimal for cost-sensitive, reliability-critical industrial replacements.
Availability
AS78L05Z-E1 is available at Aetrix Electronics and suitable for microcontroller power supplies, USB peripheral regulation, and industrial sensor interface designs requiring stable component supply and long-term manufacturability.
Supply support for AS78L05Z-E1 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions.
The AS78LXX series belongs to Diodes' legacy linear regulator product line, designed specifically for cost-effective, robust local regulation in consumer, industrial, and computing applications where simplicity and fault tolerance are prioritized.
FAQ
What is the maximum input voltage for AS78L05Z-E1?
The absolute maximum input voltage is 36V, but the recommended operating condition specifies 30V maximum for the AS78L05 variant. Exceeding 30V risks exceeding the 750mW power dissipation limit at full load and may trigger thermal shutdown prematurely. Designers should maintain VIN ≤30V with adequate margin for ripple and transients.
Does AS78L05Z-E1 require an output capacitor?
Yes - a minimum 0.1µF ceramic capacitor is required at the output pin for stability and transient response. The datasheet recommends ≥0.01µF for high-frequency noise suppression, and typical designs use 0.1–1µF X7R ceramics placed within 5mm of the output pin. Omitting this capacitor causes oscillation and output voltage instability under load changes.
Can AS78L05Z-E1 be used in parallel for higher current?
No - the AS78L05Z-E1 lacks current-sharing capability and has no built-in balancing features. Parallel connection without external ballast resistors leads to unequal current distribution and potential thermal runaway. For >100mA, select a higher-current regulator (e.g., AS7805) or use a switching solution instead.
Is AS78L05Z-E1 compatible with leaded solder reflow profiles?
Yes - the TO-92 package supports standard SnPb solder reflow with peak temperature up to 260°C for 10 seconds, per the Absolute Maximum Ratings table. However, its "E1" suffix confirms lead-free construction, so it is fully compatible with both leaded and lead-free assembly processes without modification.
AS78L05Z-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-226-3, TO-92-3 (TO-226AA)
- Packaging:
- Bulk
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 30V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.8V @ 100mA (Typ)
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 62dB (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
AS78L05Z-E1 FAQ
1.How can I place an order for AS78L05Z-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS78L05Z-E1 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 AS78L05Z-E1 reliable?
The price and inventory of AS78L05Z-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS78L05Z-E1 is usually 5 days.
3.What payment methods are accepted for AS78L05Z-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS78L05Z-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS78L05Z-E1?
AS78L05Z-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS78L05Z-E1 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 AS78L05Z-E1?
For technical support, including AS78L05Z-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS78L05Z-E1 requirements.
6.How does Aetrix verify that AS78L05Z-E1 is sourced from the original manufacturer or authorized distributors?
All AS78L05Z-E1 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 AS78L05Z-E1 meets industry standards.
7.What is the process for return or replacement of AS78L05Z-E1?
All AS78L05Z-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS78L05Z-E1, 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 AS78L05Z-E1 part is unused and in its original packaging.
Return procedure for AS78L05Z-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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