My Inquiry
My Account
Allegro MicroSystems A6261ELPTR-T
- Part No.:
- A6261ELPTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
A6261ELPTR-T.pdf
- Description:
- IC LED DRV LIN PWM 16ETSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,732
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
A6261ELPTR-T from Allegro MicroSystems is a linear, programmable 4-channel LED current regulator in 16-pin TSSOP (LP) package, delivering up to 100 mA per channel with ±4% current accuracy, 5% current matching, and integrated short-to-ground, open-LED, and thermal protection - used in automotive interior lighting and industrial status indicators.
For engineers reviewing the A6261ELPTR-T datasheet, A6261ELPTR-T pinout, A6261ELPTR-T application, or A6261ELPTR-T equivalent, this page delivers verified electrical specs, thermal foldback behavior, fault flag logic, EN-controlled PWM dimming capability, and real-world design implications for 6–50 V supply systems with up to four LED strings.
Technical Context
The A6261ELPTR-T implements four matched linear current regulators referenced to a 1.2 V internal bandgap, each sourcing up to 100 mA with dropout voltage as low as 660 mV at 40 mA. Its thermal monitor reduces output current starting at 95–130°C junction temperature, with slope of –2.5%/°C until reaching 25% current at TJL (120–150°C).
Short detection triggers at LAx < 1.2 V (typical), disabling only the affected channel while asserting open-drain FF high; open-LED detection activates when VIN – VLAx exceeds 170–450 mV for >2 ms, disabling all outputs unless overridden by pulling FF low. EN input enables direct PWM control with 150–350 mV hysteresis and 50 kΩ internal pull-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output channels | 4 independent current sources (LA1–LA4), each programmable up to 100 mA via single IREF resistor |
| Current accuracy | ±4% over –40°C to +85°C ambient; ensures consistent luminance across LED strings without binning compensation |
| Current matching | Better than 5% between channels at –20 mA to –100 mA; eliminates need for per-string ballast resistors |
| Supply range | 6–50 V input; supports 12 V automotive and 24/48 V industrial rails without external DC-DC conversion |
| Thermal foldback start | 95–130°C junction activation (TJM); reduces LED current at rate of –2.5%/°C to prevent thermal runaway |
| Fault signaling | Open-drain FF pin asserts high on short, open, or overtemperature; can be pulled low to override open-LED shutdown |
| Enable interface | EN pin with 150–350 mV hysteresis and 50 kΩ internal pull-down; supports clean PWM dimming down to 100 Hz without chatter |
Pinout & Package
Package: 16-pin TSSOP with exposed thermal pad (LP suffix), RoHS-compliant, matte-tin leadframe plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 12) | Power input | Supplies control circuitry and all four current regulators; requires local 100 nF ceramic bypass to GND |
| GND (Pin 5) | Ground reference | Primary return path for all currents; must connect directly to PCB ground plane under exposed pad |
| EN (Pin 13) | Enable control | Active-high logic input; drives all outputs on/off; internal 50 kΩ pull-down ensures safe default-off state |
| FF (Pin 14) | Fault flag output | Open-drain output asserted high during short, open, or overtemperature; requires external pull-up resistor |
| IREF (Pin 4) | Current reference | 1.2 V reference node; connect RREF to GND to set nominal current: ILAx = 12.5 × (1.2 V / RREF) |
| THTH (Pin 3) | Thermal threshold | Adjusts thermal foldback onset temperature (95–130°C) via external resistor to GND or bias voltage |
| LA1–LA4 (Pins 6,7,10,11) | LED anode drivers | Four independent current-source outputs; connect directly to LED anodes; disable by tying to VIN |
| NC (Pins 1,2,8,9,15,16) | No connection | Internally unconnected; recommended to tie to GND for mechanical stability and EMI reduction |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor current programming | One external RREF sets identical 100 mA per channel across all four outputs, reducing BOM count and layout complexity |
| Integrated short-to-ground protection | Disables only the shorted channel (LAx < 1.2 V) while maintaining regulation on remaining strings - no system-level shutdown |
| Open-LED fault override | Pulling FF low re-enables all active outputs during open-load condition, enabling fail-operational lighting designs |
| Thermal foldback with adjustable threshold | THTH pin allows precise setting of current-reduction onset (e.g., 90°C via 211 kΩ to 5 V), preventing thermal shutdown in constrained heatsinks |
| Low quiescent current in sleep mode | 10 µA typical IINS when EN = GND enables always-on power architecture without battery drain in automotive keep-alive circuits |
Applications
| Automotive Interior Lighting | Industrial Status Indicators |
|---|---|
|
Use Scenario: Illuminating dashboard backlighting, door courtesy lights, and center console controls in passenger vehicles. IC Role / Device Role / Timing Role: Constant-current driver for parallel strings of white or amber LEDs powered from 12 V battery rail. Use Value: Matches LED brightness across four zones without trimming resistors; survives load-dump transients up to 50 V. |
Use Scenario: Powering multi-color status LEDs on PLC I/O modules, HMI panels, and safety-rated equipment. IC Role / Device Role / Timing Role: Fault-aware LED driver with FF reporting for diagnostics in industrial control cabinets. Use Value: Detects open-circuit LEDs before field failure and allows continued operation via FF override - reducing unplanned downtime. |
| Commercial Signage | Architectural Accent Lighting |
|
Use Scenario: Driving segmented LED arrays in retail signage where uniform color and intensity are critical. IC Role / Device Role / Timing Role: Four-channel current source enabling independent dimming control per sign segment via EN PWM. Use Value: 5% current matching ensures consistent chromaticity across segments; thermal foldback prevents hot-spotting at elevated ambient temperatures. |
Use Scenario: Low-voltage accent lighting in hospitality environments using 24 V DC distribution. IC Role / Device Role / Timing Role: Linear LED driver replacing inefficient resistive solutions in thermally isolated fixtures. Use Value: 660 mV dropout enables full 100 mA drive even with 22 V input - maximizing usable voltage headroom and lumen output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-7 | Switch-mode buck LED driver; 1.5 A max output; requires external inductor and diode; no integrated open-LED detection | Higher efficiency (>90%) in 24–48 V systems; unsuitable for space-constrained layouts due to magnetics | Select AL8862SP-7 only when thermal budget is tight and board area permits inductor placement; not drop-in for A6261ELPTR-T |
| TPS92692QPWPRQ1 | Linear 4-channel regulator with 150 mA/channel; integrated SPI interface; AEC-Q100 Grade 1 (–40°C to +125°C) | Supports closed-loop current calibration and diagnostics via serial bus; wider temp range than A6261ELPTR-T's E-grade (–40°C to +85°C) | Choose TPS92692QPWPRQ1 for new automotive designs requiring diagnostic logging or extended temperature operation |
Compared with AL8862SP-7 and TPS92692QPWPRQ1, the A6261ELPTR-T offers simpler layout and lower EMI but is limited to linear efficiency and discontinued status - making it suitable only for legacy repair or cost-sensitive non-automotive applications where 100 mA/channel suffices.
Availability
A6261ELPTR-T is available at Aetrix Electronics and suitable for automotive interior lighting, industrial status indicators, commercial signage, and architectural accent lighting requiring stable component supply despite end-of-life status.
Supply support for A6261ELPTR-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 semiconductor company specializing in high-performance magnetic sensing, power ICs, and precision motion control solutions.
The A6261 product line was designed specifically for robust, fault-tolerant LED driving in automotive and industrial environments - emphasizing thermal resilience, short/open protection, and single-resistor configurability.
FAQ
Is A6261ELPTR-T still in production?
No, A6261ELPTR-T is discontinued as of September 30, 2024. Allegro MicroSystems has ceased manufacturing and sampling. Aetrix Electronics maintains limited legacy stock for repair and maintenance use only - not for new designs. Customers should migrate to active alternatives like TPS92692QPWPRQ1 for future projects.
What is the maximum LED string voltage supported by A6261ELPTR-T?
The A6261ELPTR-T supports LED strings with forward voltage up to VIN – 660 mV (minimum dropout). At 12 V supply and 100 mA load, it can drive up to three white LEDs (3 × 3.2 V = 9.6 V) with 2.4 V headroom. For higher-VF strings, increase VIN within the 6–50 V absolute maximum rating - but verify thermal dissipation limits.
How does the A6261ELPTR-T handle an open LED in one string?
When an open LED occurs, VIN – VLAx exceeds 170–450 mV for >2 ms, triggering open-load detection. The A6261ELPTR-T disables all four outputs and asserts FF high. However, pulling FF low overrides this action and restores output to all enabled channels - a key feature for fail-operational lighting systems.
Can A6261ELPTR-T be used with PWM dimming?
Yes, the A6261ELPTR-T supports direct PWM dimming via its EN pin. With 150–350 mV hysteresis and 50 kΩ internal pull-down, it cleanly switches all four channels on/off. Current slew time is 50–110 µs, supporting PWM frequencies up to ~10 kHz without visible flicker or current overshoot.
What thermal considerations apply to A6261ELPTR-T in TSSOP package?
The A6261ELPTR-T in 16-pin TSSOP has RθJA = 34°C/W on 4-layer JEDEC board. At 400 mA total LED current and 12 V supply driving 3×LEDs (9.6 V VF), power dissipation reaches ~1 W - raising junction temperature by ~34°C above ambient. Use thermal vias under the exposed pad and minimize copper isolation to avoid exceeding 150°C TJ(max).
A6261ELPTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 6V
- Voltage - Supply (Max):
- 50V
- Voltage - Output:
- -
- Current - Output / Channel:
- 100mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-eTSSOP-EP
A6261ELPTR-T FAQ
1.How can I place an order for A6261ELPTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for A6261ELPTR-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 A6261ELPTR-T reliable?
The price and inventory of A6261ELPTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6261ELPTR-T is usually 5 days.
3.What payment methods are accepted for A6261ELPTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6261ELPTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6261ELPTR-T?
A6261ELPTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6261ELPTR-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 A6261ELPTR-T?
For technical support, including A6261ELPTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6261ELPTR-T requirements.
6.How does Aetrix verify that A6261ELPTR-T is sourced from the original manufacturer or authorized distributors?
All A6261ELPTR-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 A6261ELPTR-T meets industry standards.
7.What is the process for return or replacement of A6261ELPTR-T?
All A6261ELPTR-T units undergo pre-shipment inspection (PSI). If there is an issue with A6261ELPTR-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 A6261ELPTR-T part is unused and in its original packaging.
Return procedure for A6261ELPTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6261ELPTR-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…
