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Diodes Incorporated AP78L08YG-13
- Part No.:
- AP78L08YG-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP78L08YG-13.pdf
- Description:
- IC REG LINEAR 8V 100MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,397
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Product details
Overview
AP78L08YG-13 from Diodes Incorporated is a fixed-output +8.0V, 100mA three-terminal positive linear voltage regulator in SOT89 package with ±5% output tolerance, internal thermal overload protection, and short-circuit current limiting. It delivers stable local regulation for logic supplies in consumer audio, optical drives, and set-top boxes without external components.
For engineers reviewing the AP78L08YG-13 datasheet, AP78L08YG-13 pinout, AP78L08YG-13 application, or AP78L08YG-13 equivalent, this page provides verified electrical specs, thermal resistance data (θJA = 157°C/W), dropout behavior at 40mA, noise performance (54µV RMS), and real-world design context for embedded power rail design.
Technical Context
The AP78L08YG-13 implements a monolithic series-pass transistor regulator with built-in safe-area protection that reduces short-circuit current as pass-device VCE increases. Its internal bandgap reference and error amplifier maintain output regulation across -20°C to +85°C ambient.
It operates with a minimum input voltage of 9.7V to sustain line regulation and exhibits 36–125mV line regulation over 11–23V input range. Ripple rejection is 37–46dB at 120Hz, and quiescent current remains stable at 2–5.5mA under load and temperature variation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +8.0V ±5% (40mA load, -20°C to +125°C junction) |
| Max Output Current | 100mA continuous (with adequate PCB copper heatsinking) |
| Input Voltage Range | 10.5V to 23V (ensures regulation and thermal safety) |
| Quiescent Current | 2.0–5.5mA (low bias draw preserves system efficiency) |
| Ripple Rejection | 37–46dB at 120Hz (suppresses AC line noise on DC rails) |
| Output Noise | 54µV RMS (10Hz–100kHz; suitable for analog-sensitive circuits) |
| Thermal Resistance θJA | 157°C/W (SOT89 on FR-4, 2oz Cu, recommended pad layout) |
Pinout & Package
SOT89 package: 3-pin, low-profile surface-mount plastic case with exposed thermal pad (pin 2 connected to GND for thermal conduction). Pin 1 = VOUT, Pin 2 = GND, Pin 3 = VIN.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | VOUT | Regulated +8.0V output; connects to load and output capacitor (0.1µF typical) |
| Pin 2 | GND | Ground reference and primary thermal path; must be tied to large copper area |
| Pin 3 | VIN | Unregulated input (10.5–23V); requires 0.33µF bypass if >3" from bulk supply |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Self-contained regulation eliminates BOM cost and layout complexity for point-of-load use |
| Internal short-circuit current limiting | Peak output current capped at 140mA to prevent damage during fault conditions |
| Safe-area protection | Pass transistor current automatically reduces as VCE rises, preventing second breakdown |
| Thermal overload shutdown | Junction temperature cutoff at 150°C prevents permanent failure under sustained overload |
| Lead-free & RoHS-compliant | SOT89 package uses green molding compound (no Br/Sb) and lead-free finish per EU directives |
Applications
| CD-ROM Drive Power | DVD Player Logic Supply |
|---|---|
Use Scenario: Provides clean +8V rail for servo motor control ICs and laser diode bias circuitry in CD-ROM mechanisms. IC Role / Device Role / Timing Role: Local linear regulator delivering stable voltage to analog front-end and digital logic blocks. Use Value: Low 54µV noise ensures minimal jitter in spindle motor commutation timing and reduces read-error rates. |
Use Scenario: Supplies +8V to MPEG decoder ASICs and video DACs in DVD playback systems. IC Role / Device Role / Timing Role: Fixed-output LDO replacing Zener/resistor networks for improved load regulation. Use Value: ±5% tolerance and 10–40mV load regulation ensure consistent digital logic thresholds across temperature and load variation. |
| Set-Top Box Tuner Module | Hi-Fi Audio Preamp Bias |
Use Scenario: Powers QAM demodulator and RF tuner ICs requiring low-noise, stable +8V in compact STB enclosures. IC Role / Device Role / Timing Role: On-board voltage regulator enabling distributed power architecture instead of centralized supply. Use Value: 37–46dB ripple rejection suppresses switching noise from adjacent DC/DC converters, preserving signal-to-noise ratio. |
Use Scenario: Generates precision +8V for op-amp biasing and analog signal conditioning in high-fidelity preamplifiers. IC Role / Device Role / Timing Role: Low-quiescent-current (2–5.5mA) linear regulator minimizing thermal drift in sensitive analog stages. Use Value: -0.8mV/°C tempco ensures <±10mV output shift over 0–70°C operating range, maintaining gain stability. |
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 |
|---|---|---|---|
| MC78L08ACZ | TO92 package only; higher θJA (176°C/W); no green compound option | Limited thermal performance in SMT designs; requires through-hole assembly | Select when legacy TO92 footprint compatibility is mandatory and board space allows vertical mounting |
| LM78L08ACM | SO-8 package; 153°C/W θJA; same 8V/100mA spec but higher IQ (5.5mA typ) | Better thermal dissipation than SOT89 on dense boards; larger footprint | Prefer when PCB layout permits SO-8 and higher quiescent current is acceptable for system standby budget |
Compared with MC78L08ACZ and LM78L08ACM, the AP78L08YG-13 offers superior thermal performance in SMT form factor (157°C/W vs. 176°C/W), green compound compliance, and lower typical quiescent current-making it optimal for space-constrained, thermally demanding consumer electronics.
Availability
AP78L08YG-13 is available at Aetrix Electronics and suitable for CD-ROM drive power, DVD player logic supply, and set-top box tuner module applications requiring stable component supply, RoHS compliance, and SMT manufacturability.
Supply support for AP78L08YG-13 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 consumer, industrial, and computing markets.
The AP78LXX series targets cost-sensitive, space-constrained embedded systems needing robust, no-component-required linear regulation-designed specifically for logic-level power in optical storage, audio, and digital entertainment equipment.
FAQ
What is the minimum input voltage required for AP78L08YG-13 to maintain regulation?
The AP78L08YG-13 requires a minimum input voltage of 9.7V to sustain line regulation under full 40mA load and across its operating temperature range. Below this, output voltage drops nonlinearly due to insufficient headroom for the series pass element.
Can AP78L08YG-13 replace a Zener diode/resistor regulator in existing designs?
Yes-it directly replaces Zener/resistor networks by providing two orders of magnitude better output impedance and lower quiescent current. No external components are needed, and it improves load regulation from ~5% to ±5% over temperature and line variations.
Is thermal derating required for continuous 100mA operation?
Yes-continuous 100mA output requires PCB-level thermal management: a minimum 2oz copper pour connected to Pin 2 (GND) using Diodes Inc.'s recommended SOT89 pad layout (AP02001). Without this, junction temperature exceeds 150°C above 65mA at 25°C ambient.
Does AP78L08YG-13 include reverse-polarity protection?
No-the device lacks internal reverse-voltage protection. Applying reverse polarity to VIN or VOUT can cause latch-up or permanent damage. External series diode or TVS protection is required in systems where supply reversal is possible.
AP78L08YG-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 23V
- Voltage - Output (Min/Fixed):
- 8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- -
- Current - Output:
- 100mA
- Current - Quiescent (Iq):
- 5.5 mA
- Current - Supply (Max):
- -
- PSRR:
- 46dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Temperature, Short Circuit
- Operating Temperature:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP78L08YG-13 FAQ
1.How can I place an order for AP78L08YG-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP78L08YG-13 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 AP78L08YG-13 reliable?
The price and inventory of AP78L08YG-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP78L08YG-13 is usually 5 days.
3.What payment methods are accepted for AP78L08YG-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP78L08YG-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP78L08YG-13?
AP78L08YG-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP78L08YG-13 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 AP78L08YG-13?
For technical support, including AP78L08YG-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP78L08YG-13 requirements.
6.How does Aetrix verify that AP78L08YG-13 is sourced from the original manufacturer or authorized distributors?
All AP78L08YG-13 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 AP78L08YG-13 meets industry standards.
7.What is the process for return or replacement of AP78L08YG-13?
All AP78L08YG-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP78L08YG-13, 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 AP78L08YG-13 part is unused and in its original packaging.
Return procedure for AP78L08YG-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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