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Allegro MicroSystems A6261KLJTR-T-1
- Part No.:
- A6261KLJTR-T-1
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
A6261KLJTR-T-1.pdf
- Description:
- IC LED DRVR LIN PWM 200MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,990
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Product details
Overview
A6261KLJTR-T-1 from Allegro MicroSystems is a dual-channel, linear LED current regulator in an 8-pin SOICN package with exposed thermal pad, delivering 200 mA per channel (LA1 and LA2) with ±4% current accuracy, 5% current matching, and 6–50 V input range. It integrates short-to-ground detection, open-LED fault flag, thermal foldback, and PWM enable control for automotive interior lighting and display backlighting.
For engineers reviewing the A6261KLJTR-T-1 datasheet, A6261KLJTR-T-1 pinout, A6261KLJTR-T-1 application, or A6261KLJTR-T-1 equivalent, key selection criteria include dual 200 mA channel capability, AEC-Q100 qualification, thermal threshold programmability via THTH pin, fault flag behavior under open/short conditions, and SOICN-8 thermal performance on 2-layer vs. 4-layer PCBs.
Technical Context
The A6261KLJTR-T-1 implements two independent linear current regulators with matched GH1 = 25× and GH2 = 12.5× reference gain ratios, enabling precise 200 mA per channel output using a single IREF resistor. Its architecture includes integrated short-detect circuitry (VSCD = 1.2–1.8 V), open-load detection (VOCD = 170–450 mV), and thermal monitor activation at TJM = 95–130 °C with adjustable threshold via THTH pin voltage.
It operates across –40 °C to +125 °C ambient, supports direct PWM dimming via EN pin (with 150–350 mV hysteresis), and features slew-limited current transitions (tSL = 50–110 µs) to reduce EMI. Fault reporting uses an open-drain FF pin that asserts high during short, open, or overtemperature events and can be pulled low to override open-load shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 200 mA per channel (LA1 & LA2); enables dual high-brightness LED strings without external ballast resistors |
| Current Accuracy | ±4% at 200 mA; ensures consistent luminance across channels under varying temperature and supply conditions |
| Current Matching | ≤5% between LA1 and LA2; maintains uniform brightness without binning or trimming |
| Supply Range | 6–50 V; compatible with 12 V automotive systems and higher-voltage industrial LED arrays |
| Dropout Voltage | 660 mV at 80 mA, 800 mV at 200 mA; allows operation with 1–3 series LEDs even at low VIN |
| Thermal Threshold | Adjustable 95–130 °C via THTH pin; enables system-level thermal coordination with LED substrate |
| Fault Flag Logic | Open-drain FF pin pulls high on short/open/overtemp; pull-low override restores outputs during open-load faults |
Pinout & Package
Package: 8-pin SOICN with exposed thermal pad (suffix LJ), RoHS-compliant, 100% matte-tin leadframe plating, RθJA = 35 °C/W (4-layer PCB) or 62 °C/W (2-layer PCB with 0.8 in² copper).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| THTH (Pin 1) | Thermal threshold programming input | Connect to GND to disable thermal foldback; use external resistor divider to set TJM from 95–130 °C |
| IREF (Pin 2) | Reference current setting node | 1.2 V internal reference; connect RREF to GND to set LA1 = 200 mA (RREF ≈ 60 Ω) and LA2 = 200 mA |
| GND (Pin 3) | Ground reference | Primary return path for control logic, reference, and thermal pad; must be low-impedance connection |
| LA1 (Pin 4) | LED anode current source 1 | 200 mA regulated output; connect to first LED anode in string; tie to VIN to disable |
| LA2 (Pin 5) | LED anode current source 2 | 200 mA regulated output; identical function to LA1; independent short/open detection |
| VIN (Pin 6) | Main power input | Supplies control circuitry and current regulators; requires 100 nF ceramic bypass capacitor to GND |
| EN (Pin 7) | Enable/PWM input | Active-high logic control; 150–350 mV hysteresis prevents noise-induced toggling; direct PWM interface |
| FF (Pin 8) | Fault flag output | Open-drain output; high = short/open/overtemp; pull-low to re-enable outputs during open-load fault |
Key Features
| Feature | Design Value |
|---|---|
| Dual 200 mA channels with shared IREF | Reduces BOM count and layout area vs. discrete regulators; eliminates need for separate current-setting resistors per channel |
| AEC-Q100 qualified (Grade K) | Validated for automotive interior lighting, instrument clusters, and center stack displays operating from –40 °C to +125 °C ambient |
| Programmable thermal foldback | Prevents thermal runaway by reducing LED current above TJM; slope of –2.5%/°C enables predictable light-output derating |
| Short-to-ground and open-LED protection | Disables faulty channel (short) or all outputs (open), flags condition on FF pin, and allows override via FF pull-down |
| Low quiescent current (10 µA sleep) | Enables always-on vehicle systems (e.g., door courtesy lights) without battery drain concerns |
Applications
| Automotive Interior Lighting | Instrument Cluster Backlighting |
|---|---|
Use Scenario: Driving LED strips for footwell, map pocket, and overhead dome lighting in passenger vehicles. IC Role / Device Role / Timing Role: Dual 200 mA constant-current source regulating two independent LED strings with synchronized PWM dimming. Use Value: Eliminates thermal derating issues in confined spaces by leveraging exposed pad and thermal foldback, ensuring stable 200 mA output across –40 °C to +85 °C cabin temperatures. | Use Scenario: Powering segmented LCD backlight zones in digital instrument clusters requiring uniform brightness and fast dimming response. IC Role / Device Role / Timing Role: High-accuracy current regulator providing matched 200 mA per zone with <110 µs current slew for flicker-free PWM dimming up to 2 kHz. Use Value: 5% current matching between LA1/LA2 ensures identical luminance across adjacent backlight zones, critical for seamless visual transitions. |
| Center Stack Display Lighting | Commercial Vehicle Cab Lighting |
Use Scenario: Illuminating touch-sensitive control panels and status indicators in infotainment center stacks. IC Role / Device Role / Timing Role: Dual-channel LED driver with fault flag monitoring for safety-critical UI elements; EN pin enables system-level brightness control. Use Value: FF pin integration simplifies microcontroller fault handling-open-load detection prevents false "off" states when individual LEDs fail in multi-segment arrays. | Use Scenario: Providing robust, long-life lighting for heavy-duty truck and bus cab environments subject to vibration and wide temperature swings. IC Role / Device Role / Timing Role: AEC-Q100 qualified linear regulator delivering 200 mA per channel with thermal shutdown at 170 °C junction limit. Use Value: Exposed thermal pad and 62 °C/W 2-layer PCB thermal resistance support reliable operation in uncooled metal enclosures typical of commercial vehicle designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6261KLJTR-T | LA1 = 200 mA, LA2 = 100 mA; same package, pinout, and thermal specs | Suitable for asymmetric loads (e.g., primary + indicator LED strings) | Select A6261KLJTR-T-1 only when both channels require full 200 mA; use A6261KLJTR-T for mixed-current designs. |
| AL8862T-7UTR | Switch-mode buck LED driver; 200 mA max, 4.5–40 V input, no thermal foldback or FF pin | Better efficiency (>90%) in high-VIN applications but lacks fault flag and open-load override | Choose AL8862T-7UTR where thermal dissipation is prohibitive; accept trade-off of reduced diagnostic capability and fixed 200 mA per channel. |
Compared with A6261KLJTR-T, the -T-1 variant delivers symmetrical 200 mA per channel for balanced LED arrays, while AL8862T-7UTR offers higher efficiency at the cost of missing integrated diagnostics and thermal management features essential for automotive reliability.
Availability
A6261KLJTR-T-1 is available at Aetrix Electronics and suitable for automotive interior lighting, instrument cluster backlighting, center stack display illumination, and commercial vehicle cab lighting requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A6261KLJTR-T-1 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 magnetic sensors, motor drivers, and power ICs, serving automotive, industrial, and consumer markets since 1989.
The A6261 product line delivers protected, programmable LED current regulation for automotive-grade lighting systems, emphasizing thermal resilience, fault diagnostics, and AEC-Q100 compliance in compact packages.
FAQ
What is the maximum continuous output current per channel for A6261KLJTR-T-1?
The A6261KLJTR-T-1 delivers 200 mA per channel (LA1 and LA2) continuously under specified thermal conditions. This is confirmed in the Selection Guide table and Electrical Characteristics section, where ILA1max and ILA2max are both rated at –220 mA (absolute value), with nominal operation at –200 mA. Derating applies above 125 °C ambient or with inadequate PCB copper area.
How does the thermal foldback feature operate in A6261KLJTR-T-1?
The A6261KLJTR-T-1 reduces LED current starting at TJM = 95–130 °C (set via THTH pin voltage), with a slope of –2.5%/°C until current reaches 25% at TJL = 120–150 °C. This foldback prevents thermal runaway by lowering power dissipation as junction temperature rises, and is distinct from hard overtemperature shutdown at TJF = 170 °C.
Can A6261KLJTR-T-1 drive more than two LED strings?
No - the A6261KLJTR-T-1 is a dual-channel variant (LA1 and LA2 only) in the LJ package. Unlike LP/LY variants offering four outputs, the LJ-1 configuration provides exactly two 200 mA current sources. LA3 and LA4 pins are not present; attempting to route additional strings requires a different package variant or parallel ICs.
What happens when an open LED is detected on one channel of A6261KLJTR-T-1?
When an open LED is detected on either LA1 or LA2, the A6261KLJTR-T-1 disables both outputs and asserts the FF pin high. The fault persists until power is cycled, EN is pulsed low-then-high, or FF is actively pulled low by an external controller - enabling recovery without hardware reset.
Is A6261KLJTR-T-1 pin-compatible with other A6261 variants?
Yes - all A6261 LJ-package variants (including A6261KLJTR-T and A6261KLJTR-T-1) share identical 8-pin SOICN pinout, thermal pad layout, and electrical interface. Differences are internal (GH1/GH2 gain ratios) and do not affect PCB footprint or signal routing; only the IREF resistor value changes to achieve target currents.
A6261KLJTR-T-1 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:
- 4
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 50V
- Voltage - Output:
- -
- Current - Output / Channel:
- 200mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
A6261KLJTR-T-1 FAQ
1.How can I place an order for A6261KLJTR-T-1 through Aetrix?
Please submit a Request for Quotation (RFQ) for A6261KLJTR-T-1 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 A6261KLJTR-T-1 reliable?
The price and inventory of A6261KLJTR-T-1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6261KLJTR-T-1 is usually 5 days.
3.What payment methods are accepted for A6261KLJTR-T-1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6261KLJTR-T-1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6261KLJTR-T-1?
A6261KLJTR-T-1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6261KLJTR-T-1 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 A6261KLJTR-T-1?
For technical support, including A6261KLJTR-T-1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6261KLJTR-T-1 requirements.
6.How does Aetrix verify that A6261KLJTR-T-1 is sourced from the original manufacturer or authorized distributors?
All A6261KLJTR-T-1 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 A6261KLJTR-T-1 meets industry standards.
7.What is the process for return or replacement of A6261KLJTR-T-1?
All A6261KLJTR-T-1 units undergo pre-shipment inspection (PSI). If there is an issue with A6261KLJTR-T-1, 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 A6261KLJTR-T-1 part is unused and in its original packaging.
Return procedure for A6261KLJTR-T-1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6261KLJTR-T-1 Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
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BCR420UE6433HTMA1
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BCR421UE6327HTSA1
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LYT1604D-TL
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HV9910CLG-G
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CL2N8-G
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BCR420UW6-7
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BCR420UFD-7
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