My Inquiry
My Account
Allegro MicroSystems A1569KLJTR-T
- Part No.:
- A1569KLJTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A1569KLJTR-T.pdf
- Description:
- IC LED DRIVER LINEAR 150MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,000
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A1569KLJTR-T from Allegro MicroSystems is an automotive-grade linear LED driver with integrated omnipolar Hall-effect switch, delivering up to 150 mA regulated current, operating from 7–24 V supply, and featuring fade-in/fade-out dimming control via external capacitor. It enables contactless, magnetically actuated interior lighting in map lights, glove boxes, and vanity mirrors.
For engineers reviewing the A1569KLJTR-T datasheet, A1569KLJTR-T pinout, A1569KLJTR-T application, or A1569KLJTR-T equivalent, key selection considerations include its AEC-Q100 qualification, thermal foldback protection, Hall switch magnetic sensitivity (±40–70 G operate point), and 8-pin SOICN package with exposed thermal pad for automotive thermal reliability.
Technical Context
The A1569KLJTR-T integrates a chopper-stabilized Hall-effect sensor with a linear current regulator, enabling precise magnetic field–triggered LED control without mechanical switches. Its dual activation modes-Hall sensing (via SEN_EN) and direct logic override (via EXT)-support flexible system architecture in space-constrained automotive modules.
Thermal management is implemented through a programmable temperature monitor (THTH pin configurable for 130°C activation or disable) and hard thermal shutdown at 170°C, while slew-rate-limited LA output suppresses EMI during LED turn-on/off transitions. Reverse-battery protection (–18 V) and short-to-ground detection (1.2–1.8 V threshold) ensure robustness in harsh vehicle electrical environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Drive Current | Up to 150 mA, set by external IREF resistor; enables single- or multi-LED strings with stable current regulation. |
| Supply Voltage Range | 7–24 V DC; supports full automotive battery range including cold-crank and load-dump transients. |
| Hall Switch Sensitivity | Omnipolar operation: BOP ±40–70 G, BRP ±5–25 G; tolerates large air gaps and mechanical misalignment in assembly. |
| Fade Timing Control | Adjustable via CFADE capacitor on FADE pin; 10–90% slew time ≈ 80 µs per 100 pF, enabling smooth visual transitions. |
| Thermal Protection | Programmable thermal foldback starting at 130°C (TJM), full shutdown at 170°C (TJF) with 15°C hysteresis. |
| Protection Features | Reverse-battery (–18 V), short-to-ground detection (1.2–1.8 V), automatic recovery after fault removal. |
| Quiescent Current | 6–10 mA active, 10–25 µA sleep mode (SEN_EN & EXT = GND); minimizes battery drain in always-on systems. |
Pinout & Package
Package: 8-pin SOICN (suffix LJ) with exposed thermal pad for enhanced heat dissipation; RoHS compliant, matte-tin leadframe plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | 7–24 V supply rail; requires local 100 nF ceramic bypass to GND for stability. |
| SEN_EN | Hall sensor enable | Logic high enables magnetic control; low forces LED off regardless of field strength. |
| EXT | External override | Logic high directly activates LED, overriding Hall sensor state for MCU or switch control. |
| LA | LED anode output | Current-source output (up to 150 mA); slew-rate limited to reduce EMI during switching. |
| GND | Ground reference | Primary return path; must be low-impedance connection for thermal pad and CFADE Kelvin grounding. |
| THTH | Thermal threshold select | Floating enables thermal foldback at 130°C; tied to GND disables foldback but retains shutdown. |
| IREF | Current reference | 1.2 V internal reference; RIREF to GND sets LED current via ILA = (1.2 V × 75) / RIREF. |
| FADE | Fade timing | Capacitor to GND controls fade-in/fade-out duration; 1 µF ≈ 0.8 s 10–90% transition. |
| PAD | Thermal pad | Electrically isolated copper pad; improves RθJA to ≤35°C/W with proper PCB thermal vias. |
Key Features
| Feature | Design Value |
|---|---|
| Omnipolar Hall switch | Eliminates magnet polarity orientation constraints during assembly, reducing production line calibration steps. |
| Programmable fade timing | Enables user-defined soft-start/soft-stop lighting effects without MCU firmware involvement. |
| Integrated thermal foldback | Gradually reduces LED current above 130°C instead of abrupt shutdown, maintaining partial illumination during thermal stress. |
| Reverse-battery protection | Withstands –18 V supply reversal without damage-critical for service technician error prevention. |
| Slew-rate-limited LA output | Reduces conducted and radiated EMI during LED switching, easing EMC compliance in vehicle cabins. |
Applications
| Map Light Activation | Glove Box Illumination |
|---|---|
Use Scenario: Door-mounted magnet triggers LED when glove box lid opens. IC Role / Device Role / Timing Role: Hall-effect switch detects lid position; linear driver supplies constant 100 mA to white LED string. Use Value: Eliminates mechanical switch wear and bounce; fade-out prevents glare when lid closes. | Use Scenario: Magnet embedded in console panel activates lighting when user presses button area. IC Role / Device Role / Timing Role: Omnipolar Hall sensor responds to either pole; EXT pin allows manual override via MCU. Use Value: Enables dual-mode control (contactless + wired) in compact space-constrained designs. |
| Vanity Mirror Lighting | Hood/Truck Bed Light |
Use Scenario: Hinged mirror activates LEDs upon opening; fade-in provides gentle illumination. IC Role / Device Role / Timing Role: FADE pin capacitor sets 1.2 s ramp time; THTH pin left floating for thermal derating in enclosed housing. Use Value: Prevents thermal runaway in sealed enclosures while delivering consistent lumen output. | Use Scenario: Magnetic latch on truck bed cover triggers lighting during nighttime access. IC Role / Device Role / Timing Role: High-sensitivity Hall switch operates reliably across –40°C to 125°C ambient; reverse-battery protection guards against jump-start errors. Use Value: Ensures fail-safe operation in extreme temperature and voltage conditions common in commercial vehicles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver with Hall-sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862Q-7 | Switching buck LED driver (not linear); no integrated Hall sensor; requires external Hall IC and logic interface. | Higher efficiency (>90%) but larger solution size; lacks fade control and magnetic integration. | Choose AL8862Q-7 only if thermal budget is extremely tight and external Hall sensing is acceptable. |
| MAX20051ATPA/V+T | Linear LED driver with PWM dimming only; no Hall sensor; AEC-Q100 qualified; 120 mA max output. | Requires external microcontroller for magnetic detection; no fade timing or omnipolar capability. | Select MAX20051ATPA/V+T when Hall functionality is handled separately and lower drive current suffices. |
Compared with AL8862Q-7 and MAX20051ATPA/V+T, the A1569KLJTR-T uniquely combines Hall sensing, fade control, and thermal foldback in one AEC-Q100 package-reducing BOM count, PCB area, and validation effort for magnetically actuated automotive lighting.
Availability
A1569KLJTR-T is available at Aetrix Electronics and suitable for automotive interior lighting, console illumination, and cargo-area lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A1569KLJTR-T 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
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance power ICs and magnetic sensors, specializing in automotive and industrial motion control solutions.
The A1569K product line delivers integrated Hall-effect LED drivers optimized for contactless, reliable, and thermally robust interior vehicle lighting-addressing design challenges in map lights, vanity mirrors, and auxiliary cabin illumination.
FAQ
What is the maximum LED current supported by the A1569KLJTR-T?
The A1569KLJTR-T supports up to 150 mA of regulated LED current, set by the external IREF resistor. At RIREF = 600 Ω, typical output is 150 mA; maximum specified is 170 mA under test conditions. Current accuracy is ±4% over 20–150 mA range, and thermal foldback begins reducing output above 130°C junction temperature to maintain reliability.
How does the A1569KLJTR-T handle reverse battery connection?
The A1569KLJTR-T includes integrated reverse-battery protection rated to –18 V on the VIN pin. This feature prevents damage during service-related wiring errors or jump-start scenarios. Unlike external diode solutions, this protection adds no forward voltage drop or thermal penalty, preserving efficiency and simplifying layout in automotive modules where polarity mistakes are common.
Can the A1569KLJTR-T operate without a magnet?
Yes-the A1569KLJTR-T can operate without a magnet using the EXT pin for direct logic control. When EXT is driven high, the LED turns on regardless of magnetic field or SEN_EN state. This enables hybrid operation: contactless activation via Hall effect when magnet is present, and deterministic MCU-driven control when needed-making the A1569KLJTR-T suitable for both automated and manual lighting functions.
What is the purpose of the THTH pin on the A1569KLJTR-T?
The THTH pin on the A1569KLJTR-T selects thermal foldback behavior: left floating enables current reduction starting at ~130°C (TJM), while tying it to GND disables foldback but retains hard thermal shutdown at 170°C. This configurability allows designers to prioritize continuous dimmed operation (floating) or absolute fault containment (GND tie), depending on application safety requirements and thermal environment constraints.
Is the A1569KLJTR-T pin-compatible with other Allegro Hall-LED drivers?
No-the A1569KLJTR-T uses a unique 8-pin SOICN (LJ) pinout optimized for its integrated Hall + linear driver architecture. While functionally similar parts like A1569E share core circuitry, they differ in temperature rating (A1569E is non-automotive) and pin assignments. The A1569KLJTR-T's specific pin mapping-including FADE, THTH, and EXT-is not replicated in other Allegro families, requiring dedicated PCB layout.
A1569KLJTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 7V
- Voltage - Supply (Max):
- 24V
- Voltage - Output:
- -
- Current - Output / Channel:
- 150mA
- Frequency:
- -
- Dimming:
- -
- Applications:
- Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
A1569KLJTR-T FAQ
1.How can I place an order for A1569KLJTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A1569KLJTR-T 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 A1569KLJTR-T reliable?
The price and inventory of A1569KLJTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A1569KLJTR-T is usually 5 days.
3.What payment methods are accepted for A1569KLJTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A1569KLJTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A1569KLJTR-T?
A1569KLJTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A1569KLJTR-T 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 A1569KLJTR-T?
For technical support, including A1569KLJTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A1569KLJTR-T requirements.
6.How does Aetrix verify that A1569KLJTR-T is sourced from the original manufacturer or authorized distributors?
All A1569KLJTR-T 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 A1569KLJTR-T meets industry standards.
7.What is the process for return or replacement of A1569KLJTR-T?
All A1569KLJTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A1569KLJTR-T, 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 A1569KLJTR-T part is unused and in its original packaging.
Return procedure for A1569KLJTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A1569KLJTR-T Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
