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Allegro MicroSystems A6275SLWTR
- Part No.:
- A6275SLWTR
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
A6275SLWTR.pdf
- Description:
- IC LED DRVR LINEAR 75.5MA 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,612
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Product details
Overview
A6275SLWTR from Allegro MicroSystems is an 8-bit serial-input constant-current latched LED driver with eight NPN sink outputs, 90 mA per channel, undervoltage lockout, and CMOS-compatible 5 V logic interface - designed for multiplexed LED displays in industrial signage and instrumentation panels.
For engineers reviewing the A6275SLWTR datasheet, A6275SLWTR pinout, A6275SLWTR application, or A6275SLWTR equivalent, key selection criteria include output current matching (±6.0% max), thermal derating at elevated ambient temperatures, cascade-capable serial data output, and compatibility with microprocessor-controlled LED column drivers.
Technical Context
The A6275SLWTR integrates a 16-pin SOICW-packaged BiCMOS shift register, parallel latches, and eight matched constant-current sink drivers regulated by a single external resistor (REXT). Its ENABLE input provides inter-digit blanking control, while SERIAL DATA OUT enables daisy-chained configurations across multiple devices.
Undervoltage lockout activates below 3.4 V to prevent erratic operation during power ramp-up; output current is set via REXT with typical values of 250 Ω (75.5 mA) or 470 Ω (40.0 mA) at VCE = 0.7 V. Propagation delays are ≤1000 ns for CLOCK/LATCH/ENABLE-to-OUT transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 90 mA max per channel; continuous sink capability over –20°C to +85°C ambient |
| Current Matching | ±6.0% max difference between any two outputs at same VCE; ensures uniform LED brightness |
| Supply Voltage | 4.5–5.5 V; supports standard 5 V microcontroller I/O without level shifting |
| UVLO Threshold | 3.4–4.0 V; prevents undefined logic states during brown-out conditions |
| Clock Frequency | Up to 10 MHz; enables fast refresh rates in high-resolution LED matrices |
| Propagation Delay | ≤1000 ns (tpHL/tpLH); guarantees timing margin for synchronous display updates |
| Thermal Resistance | RθJA = 48°C/W (SOICW); requires PCB copper area planning for >50 mA sustained loads |
Pinout & Package
16-pin SOICW (suffix LW) package with matte tin leadframe; RoHS-compliant, Pb-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Logic ground reference | Shared ground for shift register, latches, and control inputs; must be low-impedance to avoid noise-induced latch errors |
| 2 SERIAL DATA IN | Shift register serial input | Accepts CMOS-level data on rising clock edge; compatible with SPI or GPIO bit-banged interfaces |
| 3 CLOCK | Data shift clock input | Rising-edge triggered; minimum pulse width 50 ns; max frequency 10 MHz |
| 4 LATCH ENABLE | Parallel load strobe | High-level signal transfers shift register contents to output latches; enables synchronized display updates |
| 5–12 OUT0–OUT7 | Constant-current sink outputs | Each drives one LED cathode; current set by REXT; VCE drop ≤0.9 V at 90 mA |
| 13 OUTPUT ENABLE | Global output blanking | Active-low; disables all outputs simultaneously for inter-digit blanking or fault shutdown |
| 14 SERIAL DATA OUT | Cascade data output | CMOS-level output for chaining to next A6275SLWTR; supports unlimited expansion with minimal wiring |
| 15 REXT | Current-setting resistor node | Connects external resistor to set identical sink current for all eight outputs |
| 16 VDD | Logic supply input | 5 V nominal; powers internal CMOS logic and bias circuits; decoupling capacitor required |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel constant-current sink | Enables uniform LED brightness without per-channel resistors; reduces BOM count and layout complexity |
| Serial-to-parallel latching | Allows microcontroller to update all 8 outputs with one 8-bit write and single LATCH pulse - no bus contention |
| Undervoltage lockout (UVLO) | Prevents partial initialization or metastability during power-up/down sequences in embedded systems |
| Daisy-chain serial output | Eliminates need for additional GPIO lines when driving >8 LEDs; supports modular display architecture |
| Inter-digit blanking control | OUTPUT ENABLE pin allows precise timing control of LED off-periods to reduce crosstalk in multiplexed displays |
Applications
| Industrial Panel Meters | LED Segment Displays |
|---|---|
Use Scenario: Driving 7-segment or 14-segment alphanumeric displays in factory-floor HMIs where ambient temperature ranges from –20°C to +85°C. IC Role / Device Role / Timing Role: Constant-current sink driver for LED anodes powered by external supplies; handles digit multiplexing via OUTPUT ENABLE blanking. Use Value: Maintains consistent segment brightness across temperature extremes using single REXT calibration; eliminates thermal drift compensation firmware. | Use Scenario: Controlling discrete red/green/yellow status indicators on programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Parallel-output latched driver receiving serial commands from PLC CPU; enables rapid status updates without bus arbitration. Use Value: Reduces CPU overhead versus direct GPIO control; supports up to 10 MHz update rate for real-time alarm indication. |
| Dot-Matrix Signage | Test Equipment Indicators |
Use Scenario: Driving column drivers in 16×16 monochrome LED matrix displays used in retail price signs and transit information boards. IC Role / Device Role / Timing Role: Cascaded serial-input driver providing 8-column sink paths per device; synchronized via shared CLOCK and LATCH ENABLE. Use Value: Enables scalable display size using identical A6275SLWTR units; avoids custom ASIC development for medium-resolution signage. | Use Scenario: Powering front-panel LED indicators on benchtop oscilloscopes and spectrum analyzers requiring stable visual feedback under varying line voltage. IC Role / Device Role / Timing Role: Constant-current sink for indicator LEDs tied to regulated 5 V rail; UVLO ensures clean startup even during AC brownouts. Use Value: Guarantees reliable indicator operation across full instrument lifecycle without LED dimming or flicker due to supply variation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A6279 | Successor device with enhanced open-LED detection, dot correction, and wider operating temperature range (–40°C to +125°C) | Supports automated LED health monitoring and brightness calibration in high-reliability displays | Select A6279 for new designs requiring diagnostic features and extended temperature support |
| TB62705CP | Pin-compatible 8-bit constant-current LED driver from Toshiba; similar REXT-based current setting but lacks UVLO and has lower max current (60 mA) | Suitable for cost-sensitive consumer displays where diagnostics and wide-temp operation are not required | Use TB62705CP only if legacy board reuse is mandatory and 60 mA output suffices |
Compared with A6275SLWTR, the A6279 adds open-LED detection and dot correction for automated display maintenance, while TB62705CP offers pin compatibility at reduced performance and no UVLO - making A6275SLWTR the optimal choice for legacy industrial designs needing robust 90 mA drive and proven thermal stability in SOICW packaging.
Availability
A6275SLWTR is available at Aetrix Electronics and suitable for industrial panel meters, LED segment displays, dot-matrix signage, and test equipment indicators requiring stable component supply despite its Last Time Buy status.
Supply support for A6275SLWTR 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 for automotive, industrial, and consumer applications.
The A6275 product line was developed specifically for reliable, low-cost LED display driving in harsh environments - emphasizing thermal robustness, current matching, and microcontroller interoperability without external logic.
FAQ
What is the maximum continuous output current per channel for the A6275SLWTR?
The A6275SLWTR supports up to 90 mA continuous sink current per output channel (OUT0–OUT7) across its specified ambient temperature range of –20°C to +85°C, provided thermal limits are observed. This rating assumes VCE ≤ 0.9 V and proper PCB copper area for heat dissipation. At higher duty cycles or elevated temperatures, derating applies per the allowable current vs. duty cycle curves in the datasheet.
Does the A6275SLWTR require external current-setting resistors?
Yes, the A6275SLWTR requires a single external resistor (REXT) connected between pin 15 and ground to set the output current for all eight channels. Typical values are 250 Ω for ~75.5 mA or 470 Ω for ~40.0 mA at VCE = 0.7 V. The A6275SLWTR does not contain internal current references - REXT directly determines sink current magnitude and matching accuracy.
Is the A6275SLWTR pin-compatible with other Allegro LED drivers?
The A6275SLWTR shares the same 16-pin SOICW footprint and pinout with the A6275ELWTR-T and A6275EA-T variants, differing only in temperature grade and packaging. It is also pin-compatible with the Toshiba TB62705CP, though that part lacks undervoltage lockout and delivers lower maximum current (60 mA). No pin compatibility exists with the A6279, which uses a different pin assignment for diagnostic functions.
What is the purpose of the OUTPUT ENABLE pin on the A6275SLWTR?
The OUTPUT ENABLE pin (pin 13) on the A6275SLWTR is an active-low global control that disables all eight output drivers simultaneously. When driven high, it blanks the entire display - enabling inter-digit blanking in multiplexed LED systems, reducing crosstalk, and supporting power-saving modes. This function operates independently of latch state, allowing rapid visual suppression without altering stored data in the shift register or latches.
Can the A6275SLWTR be used in cascade configurations?
Yes, the A6275SLWTR supports daisy-chain cascading via its SERIAL DATA OUT pin (pin 14), which provides a CMOS-level output replicating the shift register's most significant bit. This allows multiple A6275SLWTR devices to be connected in series using a single microcontroller data line, clock, and latch signal - scaling LED drive capability linearly while minimizing GPIO usage and simplifying firmware design for large displays.
A6275SLWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
A6275SLWTR FAQ
1.How can I place an order for A6275SLWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for A6275SLWTR 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 A6275SLWTR reliable?
The price and inventory of A6275SLWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6275SLWTR is usually 5 days.
3.What payment methods are accepted for A6275SLWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6275SLWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6275SLWTR?
A6275SLWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6275SLWTR 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 A6275SLWTR?
For technical support, including A6275SLWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6275SLWTR requirements.
6.How does Aetrix verify that A6275SLWTR is sourced from the original manufacturer or authorized distributors?
All A6275SLWTR 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 A6275SLWTR meets industry standards.
7.What is the process for return or replacement of A6275SLWTR?
All A6275SLWTR units undergo pre-shipment inspection (PSI). If there is an issue with A6275SLWTR, 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 A6275SLWTR part is unused and in its original packaging.
Return procedure for A6275SLWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6275SLWTR Tags
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CL2N8-G
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