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Allegro MicroSystems A6275ELW
- Part No.:
- A6275ELW
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A6275ELW.pdf
- Description:
- IC LED DRVR LINEAR 75.5MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,052
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Product details
Overview
A6275ELW from Allegro MicroSystems is an 8-bit serial-input constant-current latched LED driver with eight NPN sink outputs, 90 mA max per channel, undervoltage lockout (UVLO), and CMOS-compatible 5 V logic interface - designed for multiplexed LED displays requiring precise current regulation and microprocessor-controlled blanking.
For engineers reviewing the A6275ELW datasheet, A6275ELW pinout, A6275ELW application, or A6275ELW equivalent, this device supports high-speed serial data rates up to 20 MHz, enables cascade chaining via serial data out, provides inter-digit blanking via active-low OUTPUT ENABLE, and requires only one external resistor (REXT) to set all output currents.
Technical Context
The A6275ELW integrates a 16-pin SOICW-packaged BiCMOS architecture comprising an 8-bit CMOS shift register, parallel latches, and eight matched NPN constant-current sink drivers. Its UVLO circuit disables operation below 3.4 V, ensuring robust power-on reset behavior.
Control logic accepts 5 V CMOS-level signals: SERIAL DATA IN shifts on CLOCK rising edge; LATCH ENABLE transfers serial data to latches on high; OUTPUT ENABLE (active low) globally blanks all outputs. Serial data out allows daisy-chaining multiple A6275ELW devices without additional logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Eight NPN constant-current sink drivers, each rated 90 mA continuous at 85°C |
| Logic Supply | 4.5–5.5 V VDD; supports standard 5 V microcontroller I/O interfacing |
| Max Data Rate | 20 MHz serial input clock frequency; enables fast display refresh in high-resolution LED matrices |
| Current Setting | Single external REXT resistor sets all eight output currents; 40 mA typical at REXT = 470 Ω |
| UVLO Threshold | 3.4–4.0 V VDD(UV); prevents erratic operation during brown-out or power ramp-up |
| Propagation Delay | 300–1000 ns (tpLH/tpHL) from CLOCK/LATCH/ENABLE to OUTn; ensures timing predictability in synchronous systems |
| Package | 16-pin SOICW (LW suffix); RoHS-compliant, 100% matte tin leadframe, JEDEC MS-013 AA footprint |
Pinout & Package
16-pin SOICW (LW) package with exposed thermal pad; 7.5 mm × 10.3 mm body, 1.27 mm pitch, 2.65 mm max height. Designed for surface-mount reflow assembly and thermal dissipation via PCB copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Logic ground reference | Common return for control logic; must be low-impedance to avoid noise-induced latch errors |
| 2 SERIAL DATA IN | Shift register serial input | Accepts CMOS-level data; sampled on rising edge of CLOCK |
| 3 CLOCK | Serial data clock input | Rising-edge-triggered; minimum pulse width 50 ns; max 20 MHz rate |
| 4 LATCH ENABLE | Data strobe control | High level transfers shift register contents to output latches; enables static display hold |
| 5–12 OUT0–OUT7 | Constant-current sink outputs | Each sinks up to 90 mA; VCE drop ≤ 0.9 V at full load; matched within ±6.0% |
| 13 OUTPUT ENABLE | Global output blanking | Active-low; when high, all outputs disabled (inter-digit blanking) |
| 14 SERIAL DATA OUT | Cascade serial output | CMOS-level output; connects directly to SERIAL DATA IN of next A6275ELW in chain |
| 15 REXT | Current-setting resistor node | Connects external resistor to set all eight output currents simultaneously |
| 16 VDD | Logic supply input | 4.5–5.5 V; powers internal CMOS logic, latches, and UVLO circuit |
Key Features
| Feature | Design Value |
|---|---|
| Constant-current sink outputs | 8 matched NPN drivers with ±6.0% current matching across outputs at same VCE |
| Undervoltage lockout (UVLO) | Prevents operation below 3.4 V; eliminates undefined logic states during power-up/down |
| High-speed serial interface | 20 MHz max clock rate supports >1 kHz refresh for 16×16 LED matrices |
| Cascade-capable serial output | CMOS SERIAL DATA OUT enables unlimited expansion without external buffers |
| Inter-digit blanking control | Active-low OUTPUT ENABLE allows precise timing control of digit visibility in multiplexed displays |
Applications
| LED Matrix Display Driver | Industrial Panel Indicator |
|---|---|
Use Scenario: Driving 8×8 or 16×8 LED dot-matrix modules in signage or instrumentation panels. IC Role / Device Role / Timing Role: Serial-to-parallel current sink driver; receives SPI-like data stream and latches column data for row-scanned display. Use Value: Eliminates discrete current-limiting resistors per LED; maintains consistent brightness across all 64 LEDs using single REXT calibration. | Use Scenario: Providing status indication on factory HMIs with red/green/yellow LED arrays. IC Role / Device Role / Timing Role: Constant-current sink for multi-color indicator banks; blanked between scans via OUTPUT ENABLE to reduce crosstalk. Use Value: Enables simultaneous drive of up to 8 LEDs per A6275ELW with <0.9 V saturation drop, minimizing heat buildup in sealed enclosures. |
| Automotive Dashboard Cluster | POS Terminal Status Display |
Use Scenario: Backlighting segmented LED gauges and warning icons in automotive instrument clusters. IC Role / Device Role / Timing Role: Current-regulated sink for high-reliability LED strings; UVLO ensures no false illumination during cold cranking (low-battery conditions). Use Value: Maintains stable 40 mA output across –40°C to +85°C ambient using REXT = 470 Ω, meeting AEC-Q100 Class 2 temperature requirements. | Use Scenario: Driving alphanumeric LED segments in retail point-of-sale terminals with variable brightness control. IC Role / Device Role / Timing Role: Serial-input latched driver enabling software-controlled segment activation; REXT adjusted for dimming via PWM duty cycle. Use Value: Supports 100+ Hz PWM dimming without visible flicker due to sub-1 μs propagation delays and fast rise/fall times (150–600 ns). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar constant-current LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6279 | Successor device with enhanced ESD rating (±4 kV HBM), improved current matching (±3%), and extended 10 MHz max clock rate | Designed for new designs requiring longer product lifecycle support; A6275ELW is Last Time Buy | Select A6279 for new designs; A6275ELW only for legacy repair or existing production continuity |
| TB62705CP | Pin-compatible 8-bit LED driver from Toshiba; identical 16-pin DIP/SOIC pinout but lacks UVLO and has lower 15 MHz max clock | Used in cost-sensitive consumer electronics where UVLO is not required and 15 MHz suffices | Not drop-in compatible due to missing UVLO and different electrical timing; requires validation of power sequencing behavior |
Compared with A6275ELW, the A6279 offers superior long-term availability and tighter current matching, while TB62705CP provides pin-equivalent functionality without UVLO - making A6275ELW suitable only for legacy systems where its specific thermal performance (RθJA = 48°C/W) and proven reliability in industrial LED matrix applications remain critical.
Availability
A6275ELW is available at Aetrix Electronics and suitable for LED matrix display driver, industrial panel indicator, and automotive dashboard cluster applications requiring stable component supply despite its Last Time Buy status.
Supply support for A6275ELW 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, headquartered in Worcester, Massachusetts.
The A6275ELW belongs to Allegro's constant-current LED driver product line, engineered specifically for reliable, low-noise, high-density LED display systems in industrial and automotive environments.
FAQ
What is the maximum continuous output current per channel for the A6275ELW?
The A6275ELW supports up to 90 mA continuous sink current per output (OUT0–OUT7) at 85°C ambient, with a maximum VCE drop of 0.9 V. This rating assumes proper PCB thermal design (RθJA = 48°C/W for SOICW) and use of an appropriate REXT resistor - for example, 250 Ω yields ~75 mA typical per channel at 25°C.
Does the A6275ELW include undervoltage lockout, and what is its threshold?
Yes, the A6275ELW includes an integrated undervoltage lockout (UVLO) circuit that disables all outputs and logic when VDD falls below 3.4 V. The UVLO release threshold is typically 4.0 V, providing hysteresis to prevent oscillation near the trip point. This ensures clean startup and shutdown behavior in systems with unstable 5 V rails.
Can multiple A6275ELW devices be cascaded, and how is this implemented?
Yes, the A6275ELW supports daisy-chain cascading via its SERIAL DATA OUT (pin 14) terminal. Connect pin 14 of one A6275ELW to pin 2 (SERIAL DATA IN) of the next device. With proper CLOCK and LATCH ENABLE synchronization across all devices, a single 64-bit serial stream can configure eight A6275ELW units - ideal for large LED displays without additional address decoding logic.
What is the purpose of the REXT pin (pin 15) on the A6275ELW?
The REXT pin (pin 15) on the A6275ELW connects to an external resistor that sets the reference current for all eight output drivers. The output current IO is inversely proportional to REXT: for example, REXT = 470 Ω yields ~40 mA per channel at VCE = 0.7 V. This single-resistor calibration simplifies BOM and ensures uniform brightness across all driven LEDs.
Is the A6275ELW still in active production, and what does "Last Time Buy" mean for this part?
No, the A6275ELW is classified as Last Time Buy (LTB) with last order deadline April 30, 2011. It remains available for existing customer applications but is obsolete for new designs. Aetrix Electronics maintains limited legacy stock with full traceability; for new projects, Allegro recommends migrating to the A6279, which offers enhanced specifications and ongoing production support.
A6275ELW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 8
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 4V
- Current - Output / Channel:
- 75.5mA
- Frequency:
- 20MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
A6275ELW FAQ
1.How can I place an order for A6275ELW through Aetrix?
Please submit a Request for Quotation (RFQ) for A6275ELW 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 A6275ELW reliable?
The price and inventory of A6275ELW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6275ELW is usually 5 days.
3.What payment methods are accepted for A6275ELW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6275ELW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6275ELW?
A6275ELW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6275ELW 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 A6275ELW?
For technical support, including A6275ELW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6275ELW requirements.
6.How does Aetrix verify that A6275ELW is sourced from the original manufacturer or authorized distributors?
All A6275ELW 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 A6275ELW meets industry standards.
7.What is the process for return or replacement of A6275ELW?
All A6275ELW units undergo pre-shipment inspection (PSI). If there is an issue with A6275ELW, 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 A6275ELW part is unused and in its original packaging.
Return procedure for A6275ELW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6275ELW Tags
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