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Allegro MicroSystems A6275EA
- Part No.:
- A6275EA
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
A6275EA.pdf
- Description:
- IC LED DRIVER LINEAR 60MA 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,448
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Product details
Overview
A6275EA from Allegro MicroSystems is an 8-bit serial-input constant-current latched LED driver with NPN sink outputs, 90 mA per channel, undervoltage lockout, and 16-pin DIP (A) package. It interfaces directly with microprocessor systems via CMOS logic, supports up to 20 MHz serial data input, and sets output current via a single external resistor - designed for multiplexed LED displays requiring stable current sinking across all eight channels.
For engineers reviewing the A6275EA datasheet, A6275EA pinout, A6275EA application, or A6275EA equivalent, key selection considerations include its 90 mA continuous sink capability at 0.9 V drop, -40°C to +85°C operating range, ENABLE-controlled inter-digit blanking, and cascade-capable serial data output for extended display chains.
Technical Context
The A6275EA integrates an 8-bit CMOS shift register, parallel latches, and eight BiCMOS NPN constant-current sink drivers in a single monolithic IC. Its architecture enables serial-to-parallel conversion synchronized to rising-edge clock transitions, with latch enable controlling data transfer from shift register to output latches.
It features undervoltage lockout (UVLO) activation at 3.4–4.0 V, open-collector-compatible output enable (active-low), and user-programmable current via REXT - delivering precise 64.2–86.8 mA per output at VCE = 0.7 V depending on REXT value (250 Ω or 470 Ω).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | NPN constant-current sink drivers (8-channel) |
| Max Output Current | 90 mA per channel, continuous at 85°C with 0.9 V saturation drop |
| Logic Supply | 4.5–5.5 V; supports 20 MHz serial data rate at 5 V |
| UVLO Threshold | 3.4–4.0 V; disables operation below valid logic supply range |
| Operating Temp | -40°C to +85°C (Range E); validated for industrial LED signage |
| Package | 16-pin through-hole DIP (A package); Pb-free, matte tin leadframe |
| Thermal Resistance | RθJA = 38°C/W (4-layer PCB); enables full 90 mA output at ambient ≤55°C |
Pinout & Package
Package: 16-pin dual in-line package (DIP), through-hole mounting, JEDEC MS-001 BB compliant, 0.300-inch wide body, lead pitch 0.100 inch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Logic ground reference | Common return for control circuitry; 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 | Shift register clock input | Rising-edge triggered; minimum pulse width 50 ns; max 10 MHz for cascade operation |
| 4 LATCH ENABLE | Data strobe control | High level transfers shift register contents to output latches; critical for display frame synchronization |
| 5–12 OUT0–OUT7 | Constant-current sink outputs | Each sinks up to 90 mA; VCE(sat) ≤ 0.9 V at 90 mA/85°C; driven by internal current regulator |
| 13 OUTPUT ENABLE | Global output blanking control | Active-low; high state disables all outputs simultaneously for inter-digit blanking |
| 14 SERIAL DATA OUT | Cascade serial output | CMOS-level output; enables daisy-chaining multiple A6275EA devices without external buffering |
| 15 REXT | Current-setting resistor node | Connects external resistor to set uniform output current across all 8 channels (e.g., 250 Ω → ~75.5 mA typ) |
| 16 VDD | Logic supply input | 4.5–5.5 V CMOS supply; powers shift register, latches, and UVLO circuitry |
Key Features
| Feature | Design Value |
|---|---|
| 8-channel constant-current sink | 90 mA per output with ±6% matching between channels at same VCE, enabling uniform LED brightness |
| Serial cascade capability | CMOS SERIAL DATA OUT allows daisy-chaining unlimited A6275EA units for large-matrix displays without added logic |
| Inter-digit blanking | Active-high OUTPUT ENABLE disables all outputs simultaneously, eliminating ghosting in multiplexed LED applications |
| User-adjustable current | Single external REXT resistor sets identical current for all 8 outputs - simplifies BOM and eliminates per-channel trimming |
| Undervoltage lockout | Prevents erratic operation during power-up/down by disabling outputs until VDD exceeds 3.4 V |
Applications
| LED Matrix Display Driver | Industrial Panel Indicator |
|---|---|
Use Scenario: Driving 8×N multiplexed alphanumeric LED displays in point-of-sale terminals and instrumentation panels. IC Role / Device Role / Timing Role: Serial-input latched sink driver providing synchronized column current control with inter-digit blanking. Use Value: Eliminates need for discrete current-limiting resistors per LED; maintains consistent brightness across 8 segments using one REXT. | Use Scenario: Controlling status indicator LEDs on factory automation HMIs exposed to wide temperature swings. IC Role / Device Role / Timing Role: Constant-current sink for red/green/yellow status LEDs operating from 5 V logic rails in harsh industrial environments. Use Value: Guaranteed 90 mA drive at 85°C ambient ensures full brightness under worst-case thermal conditions without derating. |
| LED Signage Segment Controller | Test Equipment Front Panel |
Use Scenario: Driving individual digit segments in outdoor LED message signs requiring long-term reliability and thermal stability. IC Role / Device Role / Timing Role: High-speed serial interface (20 MHz) enables rapid refresh of multi-digit displays while maintaining latch integrity. Use Value: 38°C/W thermal resistance allows full 90 mA output at ambient up to 55°C - critical for enclosed outdoor enclosures. | Use Scenario: Driving multicolor status LEDs on benchtop test equipment front panels with microcontroller-based control. IC Role / Device Role / Timing Role: Interface between MCU GPIO and high-current LEDs; handles serial data framing and latch timing internally. Use Value: Reduces MCU firmware overhead by offloading shift-and-latch sequencing; enables compact PCB layout with minimal external components. |
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 protection, improved thermal performance (RθJA = 32°C/W), and extended 10-year product longevity plan | Designed for new designs requiring long-term supply continuity; not pin-compatible with A6275EA due to revised pinout and internal architecture | Select A6279 for new designs where lifecycle assurance and higher thermal margin are required; requires PCB redesign |
| TB62705CP | Pin-compatible 8-bit constant-current LED driver from Toshiba; identical 16-pin DIP footprint and function mapping but different UVLO threshold (2.7 V) and lower max current (60 mA) | Suitable for legacy replacements where 60 mA output suffices and existing PCB layout must be retained | Use TB62705CP only for direct drop-in replacement in existing A6275EA sockets when output current demand ≤60 mA and UVLO behavior is acceptable |
Compared with A6275EA, the A6279 offers superior long-term availability and thermal headroom but requires board redesign, while TB62705CP preserves mechanical compatibility at the cost of reduced current capability and altered UVLO behavior - making A6275EA uniquely suited for legacy industrial displays needing full 90 mA at 85°C with known timing behavior.
Availability
A6275EA is available at Aetrix Electronics and suitable for LED matrix display driver, industrial panel indicator, and LED signage segment controller applications requiring stable component supply despite its Last Time Buy status.
Supply support for A6275EA 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 driver ICs, and precision power ICs for automotive, industrial, and consumer markets.
The A6275EA belongs to Allegro's constant-current LED driver product line, engineered specifically for reliable, thermally robust driving of multiplexed LED displays in industrial and commercial signage applications.
FAQ
What is the maximum continuous output current per channel for the A6275EA?
The A6275EA delivers up to 90 mA per output channel continuously across the full operating temperature range of –40°C to +85°C, with a typical saturation voltage of 0.9 V at 90 mA and 85°C. This rating is validated under standard JEDEC 4-layer PCB conditions with RθJA = 38°C/W. Derating applies above 55°C ambient if full 90 mA is sustained across all eight outputs.
Does the A6275EA support daisy-chaining with other LED drivers?
Yes, the A6275EA supports daisy-chaining via its CMOS SERIAL DATA OUT (pin 14), which provides a buffered, logic-level output compatible with the SERIAL DATA IN of another A6275EA or compatible device. This enables scalable LED matrix expansion without external level-shifting or buffering components, preserving signal integrity up to 10 MHz in cascade configurations.
How is output current set on the A6275EA?
Output current on the A6275EA is set by a single external resistor connected to pin 15 (REXT). The value of REXT determines the regulated current for all eight output channels simultaneously - for example, a 250 Ω resistor yields a typical output current of 75.5 mA per channel at VCE = 0.7 V. No per-channel calibration or trimming is required.
What does "Last Time Buy" mean for the A6275EA?
"Last Time Buy" indicates that the A6275EA is obsolete and no longer in active production. Allegro issued final purchase notification with a deadline of April 30, 2011. Aetrix Electronics maintains limited legacy stock for existing customer applications only; the A6275EA is not recommended for new designs, and samples are no longer available from Allegro.
Is the A6275EA pin-compatible with the TB62705CP?
Yes, the A6275EA is pin-compatible with the TB62705CP - both use the same 16-pin DIP (A) package and identical pin functions including SERIAL DATA IN, CLOCK, LATCH ENABLE, OUTPUT ENABLE, and REXT. However, differences exist in UVLO threshold (A6275EA: 3.4–4.0 V; TB62705CP: ~2.7 V) and max output current (A6275EA: 90 mA; TB62705CP: 60 mA), requiring validation in target applications.
A6275EA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- 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:
- 60mA
- Frequency:
- 20MHz
- Dimming:
- -
- Applications:
- -
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
A6275EA FAQ
1.How can I place an order for A6275EA through Aetrix?
Please submit a Request for Quotation (RFQ) for A6275EA 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 A6275EA reliable?
The price and inventory of A6275EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6275EA is usually 5 days.
3.What payment methods are accepted for A6275EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6275EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6275EA?
A6275EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6275EA 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 A6275EA?
For technical support, including A6275EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6275EA requirements.
6.How does Aetrix verify that A6275EA is sourced from the original manufacturer or authorized distributors?
All A6275EA 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 A6275EA meets industry standards.
7.What is the process for return or replacement of A6275EA?
All A6275EA units undergo pre-shipment inspection (PSI). If there is an issue with A6275EA, 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 A6275EA part is unused and in its original packaging.
Return procedure for A6275EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6275EA Tags
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BCR420UE6433HTMA1
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CL2N8-G
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BCR420UW6-7
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BCR420UFD-7
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