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Diodes Incorporated AL8400SE-7
- Part No.:
- AL8400SE-7
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
AL8400SE-7.pdf
- Description:
- IC LED DRIVER LINEAR SOT353
- Quantity:
- Payment:
- Shipping:
Inventory:5,679
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Product details
Overview
AL8400SE-7 from Diodes Incorporated is an automotive-grade qualified linear LED driver-controller in SOT353 package, featuring 200mV feedback reference voltage, -40°C to +125°C operating range, ±3% VFB tolerance at +25°C, and 0.2V–18V open-collector output capable of driving external NPN transistors or N-channel MOSFETs for medium-to-high-current LED regulation in isolated offline lamps and instrumentation backlighting.
For engineers reviewing the AL8400SE-7 datasheet, AL8400SE-7 pinout, AL8400SE-7 application, or AL8400SE-7 equivalent, key selection criteria include its low 200mV current-sense threshold for minimal power loss, AEC-Q100 Grade 1 qualification (via AL8400Q variant), thermal stability across automotive ambient conditions, and compatibility with external pass devices for flexible LED chain voltage scaling beyond 18V.
Technical Context
The AL8400SE-7 implements a precision current-regulation loop using an internal 200mV bandgap reference and high-gain transconductance amplifier (4500 mA/V), enabling accurate LED current control via external RSET. Its open-collector OUT pin operates from 0.2V to 18V and sinks up to 15mA, supporting both bipolar and MOSFET pass elements with dynamic output impedance of 0.25–0.6Ω over temperature.
It achieves >45dB PSRR at 300kHz and 600kHz unity-gain bandwidth, ensuring robust rejection of supply ripple and stable loop compensation when paired with properly sized external RB and CL components - where CL × RB ≥ 2ms is required to prevent 5MHz oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VFB | 200mV nominal; enables ultra-low-power current sensing with RSET = 0.2V/ILED, minimizing dissipation in sense resistor. |
| Operating Temp | -40°C to +125°C; supports under-hood and dashboard applications without derating. |
| VOUT Range | 0.2V to 18V; allows direct drive of external NPN/MOSFET gates or bases, enabling LED chains exceeding 18V via VCC tap. |
| IOUT Max | 15mA; sufficient to bias high-hFE transistors (e.g., DNLS320E) or low-VGS(th) MOSFETs (e.g., DMN6068SE) with margin. |
| PSRR | >45dB at 300kHz; suppresses switching noise from upstream DC/DC converters in mixed-power-rail LED systems. |
| θJA | 400°C/W (SOT353); requires careful PCB copper area design to maintain TJ < 150°C at full load. |
| Package | SOT353; 5-pin, low-profile surface-mount package compatible with automated assembly and space-constrained lighting modules. |
Pinout & Package
SOT353 package: 5-pin, low-profile plastic surface-mount package with exposed pad thermal enhancement (per AP02002). Dimensions: 2.20 × 1.35 × 0.95 mm (L × W × H), pitch 0.65 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (E1) | Emitter connection | Must be tied directly to analog ground; forms return path for internal reference and amplifier bias currents. |
| 2 (GND) | Analog ground | Ground reference for FB amplifier and internal circuitry; must be shorted to E1 with low-inductance trace. |
| 3 (VCC) | Supply input | Accepts 2.2V–18V; requires 0.47µF ceramic decoupling capacitor placed ≤5mm from pin to ensure stability. |
| 4 (FB) | Feedback input | Senses voltage across RSET; regulates ILED by holding node at 200mV ±3% at +25°C. |
| 5 (OUT) | Open-collector output | Sinks up to 15mA; drives base/gate of external pass device; requires external pull-up resistor (RB) to VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Low VFB reference | 200mV ±3% at +25°C ensures <1% LED current error from sense resistor tolerance alone. |
| Wide VOUT swing | 0.2V–18V output compliance enables use with high-VCE(sat) BJTs or logic-level MOSFETs across diverse LED string voltages. |
| High PSRR | >45dB at 300kHz maintains current regulation integrity in noisy 12V automotive or industrial supply environments. |
| Thermal stability | ±10mV VFB drift over -40°C to +125°C minimizes LED brightness shift in wide-temperature deployments. |
| RoHS/Green compliance | Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb); lead-free terminations meet EU RoHS 2. |
Applications
| Isolated Offline LED Lamps | Instrumentation Illumination |
|---|---|
|
Use Scenario: LED-based indicator lamps in AC-powered industrial control panels with transformer-isolated 12V DC rails. IC Role / Device Role / Timing Role: Linear LED current controller regulating constant 150–400mA through 3–6 series LEDs using external DNLS320E BJT. Use Value: Eliminates need for magnetic transformers or complex flyback controllers; achieves >90% system efficiency at 12V input with 200mV sense loss. |
Use Scenario: Backlighting for analog panel meters and digital displays in automotive dashboards and avionics. IC Role / Device Role / Timing Role: Precision current source driving parallel LED strings with matched brightness via 200mV reference and low tempco amplifier. Use Value: Maintains ±5% luminance uniformity across -40°C to +85°C ambient due to <10mV VFB drift and high PSRR. |
| LED Signs | Linear LED Driver Modules |
|
Use Scenario: Outdoor channel-letter signage powered from 12V/24V battery or PoE-derived supplies with long LED strings. IC Role / Device Role / Timing Role: Controller for N-channel MOSFET pass element (e.g., DMN6068SE) regulating 200mA per segment with VCC tapped from LED string. Use Value: Enables >60V LED chain operation without external HV regulators; CL × RB ≥ 2ms prevents instability in large-area PCB layouts. |
Use Scenario: Compact, cost-optimized LED driver boards for commercial lighting fixtures requiring <5mm board height. IC Role / Device Role / Timing Role: Core current-regulation IC in SOT353 footprint, interfacing with external RSET, RB, and CL to form complete linear driver stage. Use Value: Reduces BOM count by 40% vs. integrated-driver ICs; supports field-replaceable pass transistors for maintenance flexibility. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar linear LED controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8400QSE-7 | AEC-Q100 Grade 1 qualified; identical electrical specs but automotive-qualified screening and traceability. | Required for production automotive lighting; same pinout and layout, but higher test coverage and lot traceability. | Select AL8400QSE-7 for OEM automotive programs; AL8400SE-7 suffices for industrial or commercial non-automotive use. |
| LM3407MMX/NOPB | 250mV VFB, 1.25MHz bandwidth, integrated gate driver; no external RB/CL compensation required. | Better suited for compact single-layer PCBs; lacks VCC tap capability and has narrower VIN range (6–42V). | Choose LM3407 for faster transient response and simpler layout; retain AL8400SE-7 when >18V LED chains or thermal budget constraints favor discrete pass devices. |
Compared with AL8400QSE-7, the AL8400SE-7 offers identical performance at lower qualification cost; versus LM3407MMX/NOPB, it trades integrated simplicity for superior high-voltage flexibility and thermal manageability via external pass element selection.
Availability
AL8400SE-7 is available at Aetrix Electronics and suitable for isolated offline LED lamps, instrumentation illumination, and LED signs requiring stable component supply with consistent parametric performance across production batches.
Supply support for AL8400SE-7 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 lighting solutions for automotive, industrial, and consumer markets.
The AL8400 product line delivers precision linear LED control for applications demanding low thermal drift, high PSRR, and flexible external pass-device integration - targeting automotive interior lighting, industrial HMIs, and energy-efficient signage.
FAQ
What is the minimum recommended RSET value for AL8400SE-7?
The AL8400SE-7 does not specify a minimum RSET value, but practical limits arise from VFB accuracy and thermal noise. At 200mV reference, RSET = 1Ω yields 200mA - well within the 0.3–15mA IOUT range. Values below 0.5Ω increase sensitivity to PCB trace resistance and require 4-terminal Kelvin sensing for <1% current error.
Can AL8400SE-7 drive multiple parallel LED strings?
No - AL8400SE-7 regulates current in a single string only. Driving parallel strings requires individual RSET/FB paths per string or external current-mirror circuitry. Mismatched forward voltages cause current imbalance; for multi-string designs, use separate AL8400SE-7 channels or switch to matrix-driven constant-current ICs.
Why is a compensation capacitor (CL) mandatory on the OUT pin?
CL stabilizes the current-control loop by compensating phase shift introduced by the external pass device's capacitance and PCB parasitics. Without CL, the 600kHz amplifier gain-phase response exhibits >5MHz oscillation risk. The CL × RB ≥ 2ms rule ensures ≥45° phase margin; typical values range from 180nF to 220nF with 8.2kΩ–11kΩ RB.
Does AL8400SE-7 support PWM dimming?
AL8400SE-7 has no dedicated PWM input. Dimming is implemented externally by modulating the VCC rail or the base/gate drive of the external pass transistor using a separate PWM signal. Fast switching (>1kHz) requires careful layout to avoid coupling into FB or GND nodes; duty-cycle resolution is limited by thermal time constants of the pass device.
AL8400SE-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- No
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.2V
- Voltage - Supply (Max):
- 18V
- Voltage - Output:
- 0.2V ~ 18V
- Current - Output / Channel:
- -
- Frequency:
- -
- Dimming:
- -
- Applications:
- Signage
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-353
AL8400SE-7 FAQ
1.How can I place an order for AL8400SE-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AL8400SE-7 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 AL8400SE-7 reliable?
The price and inventory of AL8400SE-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AL8400SE-7 is usually 5 days.
3.What payment methods are accepted for AL8400SE-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AL8400SE-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AL8400SE-7?
AL8400SE-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AL8400SE-7 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 AL8400SE-7?
For technical support, including AL8400SE-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AL8400SE-7 requirements.
6.How does Aetrix verify that AL8400SE-7 is sourced from the original manufacturer or authorized distributors?
All AL8400SE-7 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 AL8400SE-7 meets industry standards.
7.What is the process for return or replacement of AL8400SE-7?
All AL8400SE-7 units undergo pre-shipment inspection (PSI). If there is an issue with AL8400SE-7, 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 AL8400SE-7 part is unused and in its original packaging.
Return procedure for AL8400SE-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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