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Diodes Incorporated AS78L05RTR-E1
- Part No.:
- AS78L05RTR-E1
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AS78L05RTR-E1.pdf
- Description:
- IC REG LINEAR 5V 100MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:46,794
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Product details
Overview
AS78L05RTR-E1 from Diodes Incorporated is a fixed 5V, 100mA positive linear voltage regulator in SOT-89 package, designed for local on-card regulation in space-constrained PCBs. It delivers ±5% output voltage accuracy over –40°C to +125°C, features internal current limiting and thermal shutdown, and operates with input voltages up to 30V - ideal for microprocessor core power and embedded sensor supply rails.
For engineers reviewing the AS78L05RTR-E1 datasheet, AS78L05RTR-E1 pinout, AS78L05RTR-E1 application, or AS78L05RTR-E1 equivalent, key selection criteria include dropout voltage (1.7V at 40mA), PSRR (47–62dB at 120Hz), output noise (40µV RMS, 10Hz–100kHz), and thermal resistance (28.3°C/W junction-to-case in SOT-89).
Technical Context
The AS78L05RTR-E1 implements a monolithic series-pass regulator architecture with built-in safe-area compensation for output transistor protection. Its internal bandgap reference and error amplifier maintain stable 5V output under varying line (7–20V) and load (1–100mA) conditions without external components.
Thermal shutdown activates at 150°C junction temperature, and short-circuit current limiting holds output current below 100mA during fault conditions. The device requires only 0.33µF input and 0.1µF output ceramic capacitors for stability across its full operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5.0 V ±5% (4.75–5.25 V over –40°C to +125°C, ensuring reliable logic-level compliance) |
| Max Output Current | 100 mA (continuous DC load capability with adequate heatsinking) |
| Dropout Voltage | 1.7 V at 40 mA (enables operation from 6.7V min input; critical for low-headroom 7–12V rail designs) |
| PSRR | 47–62 dB at 120 Hz (suppresses ripple from upstream switching converters or noisy AC/DC supplies) |
| Output Noise | 40 µV RMS (10 Hz–100 kHz; suitable for analog sensors and low-noise MCU peripherals) |
| Quiescent Current | 3–5.5 mA (low standby consumption for battery-backed or always-on subsystems) |
| Thermal Resistance θJC | 28.3 °C/W (SOT-89 package enables ~2.6W max power dissipation with 75°C case rise) |
Pinout & Package
SOT-89 package: 3-pin surface-mount, thermally enhanced plastic outline with exposed pad (not electrically connected). Pin 1 = INPUT, Pin 2 = GND, Pin 3 = OUTPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated DC input | Accepts 7–30V; must be decoupled with ≥0.33µF capacitor close to pin |
| 2 (GND) | Ground reference | Common return path for input capacitor, output capacitor, and load; connects to thermal pad |
| 3 (OUTPUT) | Regulated 5V output | Delivers up to 100mA; requires ≥0.1µF ceramic capacitor for stability and noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation with integrated pass transistor, reference, and error amplifier - reduces BOM count and layout area |
| Internal thermal shutdown | Automatic disable above 150°C junction temperature - prevents damage during overload or poor heatsinking |
| Safe-area compensated output transistor | Prevents second breakdown under transient overloads - improves reliability in dynamic load applications |
| ±5% output voltage tolerance | Tight regulation across full industrial temperature range (–40°C to +125°C) - ensures compatibility with 5V TTL and CMOS logic |
| Lead-free and RoHS compliant | E1 suffix denotes Diodes Incorporated's standard lead-free finish - meets global environmental compliance requirements |
Applications
| Microprocessor Core Supply | Industrial Sensor Interface |
|---|---|
|
Use Scenario: Powering 5V I/O peripherals and low-power MCU cores on compact industrial control boards. IC Role / Device Role / Timing Role: Local point-of-load regulator providing clean, stable 5V from a shared 12V intermediate rail. Use Value: 40µV output noise and 62dB PSRR prevent digital switching noise from coupling into sensitive ADC references or UART lines. |
Use Scenario: Supplying analog-output temperature, pressure, and current-loop transmitters in factory automation nodes. IC Role / Device Role / Timing Role: Precision bias source delivering regulated 5V to op-amp signal conditioning stages and 4–20mA driver ICs. Use Value: ±5% output accuracy over –40°C to +125°C ensures consistent sensor excitation and calibration integrity across ambient extremes. |
| Consumer Audio Front-End | Automotive Body Control Module |
|
Use Scenario: Powering headphone amplifiers, DACs, and microphone preamps in portable audio devices. IC Role / Device Role / Timing Role: Low-noise post-regulator cleaning switched-mode supply outputs before analog signal paths. Use Value: 40µV RMS noise floor preserves SNR in 24-bit audio paths; SOT-89 footprint enables dense, cost-effective layout. |
Use Scenario: Providing auxiliary 5V rail for LIN transceivers, EEPROMs, and LED drivers in non-safety-critical BCM subassemblies. IC Role / Device Role / Timing Role: Robust local regulator tolerant of automotive load-dump transients up to 30V input. Use Value: Internal current limiting and thermal shutdown ensure fail-safe behavior during wiring faults or connector shorts. |
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 |
|---|---|---|---|
| MC78L05ACZTR (onsemi) | Same 5V/100mA spec, but TO-92 only; higher quiescent current (5.5 mA typ vs. 4.2 mA typ) | Limited to through-hole assembly; lacks SOT-89 thermal performance (θJA = 200°C/W vs. 180°C/W) | Select when legacy TO-92 footprint or lower-cost bulk packaging is required |
| TLV70033DCKR (TI) | Lower dropout (0.175V @ 200mA), but 3.3V output only; requires external capacitors with specific ESR | Not pin-compatible; targets ultra-low-power 3.3V systems, not 5V legacy logic | Choose only if redesigning for 3.3V logic and <1V input headroom is mandatory |
Compared with MC78L05ACZTR and TLV70033DCKR, the AS78L05RTR-E1 uniquely balances SOT-89 thermal efficiency, 5V compatibility, and drop-in replaceability in existing 5V microcontroller and sensor designs - without requiring layout changes or voltage translation.
Availability
AS78L05RTR-E1 is available at Aetrix Electronics and suitable for industrial control panels, consumer audio subsystems, and automotive body electronics requiring stable component supply, RoHS compliance, and SMT manufacturability.
Supply support for AS78L05RTR-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 for industrial, computing, and automotive markets.
The AS78LXX series was developed as a cost-optimized, thermally robust alternative to legacy 78Lxx regulators - targeting space-constrained, high-volume applications where fixed 5V/12V/15V local regulation is needed without external components.
FAQ
What is the minimum input voltage required for stable 5V output at 100mA?
The AS78L05RTR-E1 requires a minimum input voltage of 6.7V to maintain regulation at 100mA load, based on its 1.7V dropout voltage specification. Below this threshold, output voltage drops linearly with input; operation below 7V is not recommended for full-load applications.
Can AS78L05RTR-E1 replace older 78L05 variants in existing designs?
Yes - it is pin-compatible with standard 3-pin SOT-89 78L05 regulators and matches the same electrical specifications (5V ±5%, 100mA, thermal shutdown). No layout or schematic changes are needed, though its lower θJC (28.3°C/W) allows higher power handling than many legacy equivalents.
Is an input capacitor mandatory, and what value is recommended?
Yes, a minimum 0.33µF ceramic capacitor is required between INPUT and GND, placed within 5mm of the pins. This stabilizes the regulator against input impedance variations and suppresses high-frequency noise from upstream sources - omission risks oscillation or poor transient response.
Does AS78L05RTR-E1 support reverse-polarity input protection?
No - the device lacks internal reverse-voltage protection. Applying negative voltage to the INPUT pin relative to GND may cause irreversible damage. External protection (e.g., series diode or TVS) is required in environments prone to wiring errors or battery reversal.
AS78L05RTR-E1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AS78L05RTR-E1 FAQ
1.How can I place an order for AS78L05RTR-E1 through Aetrix?
Please submit a Request for Quotation (RFQ) for AS78L05RTR-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 AS78L05RTR-E1 reliable?
The price and inventory of AS78L05RTR-E1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AS78L05RTR-E1 is usually 5 days.
3.What payment methods are accepted for AS78L05RTR-E1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AS78L05RTR-E1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AS78L05RTR-E1?
AS78L05RTR-E1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AS78L05RTR-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 AS78L05RTR-E1?
For technical support, including AS78L05RTR-E1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AS78L05RTR-E1 requirements.
6.How does Aetrix verify that AS78L05RTR-E1 is sourced from the original manufacturer or authorized distributors?
All AS78L05RTR-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 AS78L05RTR-E1 meets industry standards.
7.What is the process for return or replacement of AS78L05RTR-E1?
All AS78L05RTR-E1 units undergo pre-shipment inspection (PSI). If there is an issue with AS78L05RTR-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 AS78L05RTR-E1 part is unused and in its original packaging.
Return procedure for AS78L05RTR-E1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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