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Allegro MicroSystems A6276EA
- Part No.:
- A6276EA
- Manufacturer:
- Allegro MicroSystems
- Category:
- LED Drivers
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
A6276EA.pdf
- Description:
- IC LED DRVR LINEAR 75.5MA 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,369
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Product details
Overview
A6276EA from Allegro MicroSystems is a 16-bit serial-input, constant-current latched LED driver in 24-pin DIP package, featuring 16 NPN sink outputs with user-adjustable current (up to 90 mA per channel via REXT), undervoltage lockout (3.4–4.0 V), and 20 MHz serial data input rate at 5 V logic supply - deployed in industrial LED segment displays and dot-matrix signage.
For engineers reviewing the A6276EA datasheet, A6276EA pinout, A6276EA application, or A6276EA equivalent, this page delivers verified electrical specs, thermal derating guidance for continuous 90 mA operation, cascade-capable CMOS serial output, and inter-digit blanking via active-low ENABLE - all critical for high-reliability LED display controller selection.
Technical Context
The A6276EA integrates a 16-bit BiCMOS shift register, parallel latches, and 16 matched NPN constant-current sink drivers - enabling serial-to-parallel conversion and independent output control. Its logic operates at 4.5–5.5 V, with propagation delays ≤1000 ns for CLOCK/LATCH/ENABLE-to-OUT transitions and 40 ns for CLOCK-to-SERIAL DATA OUT.
Output current is set externally via REXT (e.g., 250 Ω yields 75.5 mA typ. at VCE = 0.7 V), with ±6.0% matching across outputs and <5.0 μA leakage at 15 V. Undervoltage lockout disables operation below ~3.7 V, preventing erratic behavior during power ramp-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Channels | 16 independent constant-current NPN sink drivers |
| Max Output Current | 90 mA per channel, continuous at 85°C with DIP package |
| Serial Data Rate | 20 MHz max at 5 V supply - supports high-refresh LED displays |
| Undervoltage Lockout | 3.4–4.0 V threshold - prevents malfunction during brownout |
| Logic Supply Range | 4.5–5.5 V - compatible with standard 5 V microcontroller interfaces |
| Current Setting | Single external REXT resistor - enables precise, uniform brightness tuning |
| Propagation Delay | ≤1000 ns (CLOCK/LATCH/ENABLE to OUT) - ensures tight timing in cascaded systems |
Pinout & Package
Package: 24-pin through-hole DIP (JEDEC MS-001 BE), lead-free with 100% matte tin plating, RθJA = 50°C/W on 1-layer PCB.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Common reference for logic and power ground - must be low-impedance to avoid latch misfires |
| 2 | SERIAL DATA IN | CMOS-level serial input to shift register - data shifted on rising clock edge |
| 3 | CLOCK | Rising-edge-triggered shift clock - min. pulse width 50 ns, max. 10 MHz for cascade |
| 4 | LATCH ENABLE | High-level strobe - transfers shift register contents to output latches |
| 5–20 | OUT0–OUT15 | 16 NPN current-sink outputs - each drives one LED cathode with user-set current |
| 21 | OUTPUT ENABLE | Active-low global blanking - disables all outputs without affecting latch state |
| 22 | SERIAL DATA OUT | CMOS-level daisy-chain output - connects to next A6276EA's SERIAL DATA IN |
| 23 | REXT | External current-setting resistor connection - sets identical current for all 16 outputs |
| 24 | SUPPLY (VDD) | 5 V logic supply - powers internal CMOS logic and latches |
Key Features
| Feature | Design Value |
|---|---|
| 16-channel constant-current sinking | Enables uniform LED brightness across 16 segments/digits without individual resistors |
| CMOS serial interface with 20 MHz rate | Reduces microcontroller I/O count and supports high-speed display updates |
| Global inter-digit blanking (OE) | Eliminates ghosting during digit multiplexing by synchronously disabling all outputs |
| Daisy-chain serial output (SDO) | Permits unlimited expansion of LED drive lines using single MCU SPI port |
| Undervoltage lockout (UVLO) | Prevents undefined logic states and output glitches during power-up/down transients |
Applications
| Industrial LED Segment Displays | Dot-Matrix Signage Panels |
|---|---|
|
Use Scenario: Driving 7-segment or 14-segment alphanumeric displays in factory HMIs, instrumentation panels, and energy meters. IC Role / Device Role / Timing Role: Constant-current sink driver with latch-enabled static display hold and inter-digit blanking for flicker-free multiplexing. Use Value: Delivers stable 90 mA per segment at 85°C ambient - eliminates thermal current drift and ensures consistent brightness over full operating range. |
Use Scenario: Controlling red/green/blue LED modules in outdoor advertising signs and transit information boards. IC Role / Device Role / Timing Role: Serial-input latched driver enabling pixel-level brightness control via REXT and synchronized blanking across rows/columns. Use Value: Supports 10 MHz cascade clocking and 40 ns SDO delay - maintains timing integrity in large-scale daisy-chained arrays up to hundreds of devices. |
| Automotive Dashboard Clusters | POS Terminal Numeric Displays |
|
Use Scenario: Illuminating segmented speedometers, fuel gauges, and warning indicators in automotive instrument clusters. IC Role / Device Role / Timing Role: High-reliability LED driver with UVLO and -40°C to +85°C operation - immune to vehicle battery voltage sag. Use Value: Matches LED forward voltages (1.6–4.0 V) while maintaining <0.75 V VCE drop - minimizes heat generation in confined dashboard enclosures. |
Use Scenario: Powering numeric displays in retail point-of-sale terminals, kiosks, and ticket printers. IC Role / Device Role / Timing Role: Low-power BiCMOS driver interfacing directly with 5 V microcontrollers - no level-shifting required. Use Value: Consumes only 1.4 mA quiescent current (OE high) - extends standby battery life in portable POS units. |
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 |
|---|---|---|---|
| TB62706BN | Pin-compatible 16-bit sink driver but lacks undervoltage lockout and has higher RθJA (65°C/W vs. 50°C/W) | Requires external UVLO circuitry; less thermally robust in high-density layouts | Acceptable where board space permits heatsinking and system-level brownout protection exists |
| A6275ELWTR-T | 8-bit version in SOICW package - half the channel count, same REXT current-setting architecture | Used in smaller displays or where partial segmentation suffices; not scalable to 16+ segments | Select when footprint and channel count must be reduced - not a functional replacement for full 16-bit needs |
Compared with TB62706BN, the A6276EA provides integrated UVLO and superior thermal performance in DIP; compared with A6275ELWTR-T, it doubles channel count and retains identical current-setting simplicity - making it optimal for full-segment industrial displays requiring reliability and scalability.
Availability
A6276EA is available at Aetrix Electronics and suitable for industrial LED segment displays, dot-matrix signage panels, and automotive dashboard clusters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for A6276EA 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 of high-performance magnetic sensors, motor drivers, and precision power ICs, serving automotive, industrial, and consumer markets since 1989.
The A6276EA belongs to Allegro's LED driver product line, engineered specifically for high-current, high-reliability segment and matrix display applications - emphasizing thermal robustness, current matching, and seamless microcontroller integration.
FAQ
What is the maximum continuous output current per channel for the A6276EA at 85°C?
The A6276EA delivers up to 90 mA per output channel continuously at 85°C ambient when mounted in its 24-pin DIP package, leveraging the copper leadframe and low logic-power dissipation to maintain full-rated current without derating - confirmed in the Absolute Maximum Ratings table and thermal graphs (Dwg. GP-062-9).
How does the A6276EA set output current, and what resistor value yields ~75 mA per channel?
The A6276EA uses a single external resistor (REXT, Pin 23) to set identical current for all 16 outputs. At VCE = 0.7 V and 25°C, a 250 Ω resistor yields 75.5 mA typical output current - per Electrical Characteristics table (IO, REXT = 250 Ω). The relationship is inverse-linear and documented in Figure GP-061.
Does the A6276EA support daisy-chaining, and what is the maximum recommended cascade clock frequency?
Yes, the A6276EA supports daisy-chaining via its CMOS SERIAL DATA OUT (Pin 22), which feeds the next device's SERIAL DATA IN. The Recommended Operating Conditions specify a maximum clock frequency of 10 MHz for cascade operation - though the device accepts up to 20 MHz at 5 V for single-device use.
What is the function of the OUTPUT ENABLE (OE) pin on the A6276EA, and is it active-high or active-low?
The OUTPUT ENABLE (Pin 21) is an active-low global blanking input: when high, all 16 output drivers are disabled (blanked); when low, outputs reflect their latched states. This enables synchronized digit blanking in multiplexed displays without altering latch contents - detailed in Terminal Description and Truth Table sections.
Is the A6276EA RoHS-compliant, and what plating is used on its leads?
Yes, the A6276EA is RoHS-compliant and lead (Pb)-free, with 100% matte tin plating on the leadframe - explicitly stated in the introductory description and confirmed in the Packages section of the datasheet.
A6276EA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- Shift Register
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- 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:
- Through Hole
- Supplier Device Package:
- 24-DIP
A6276EA FAQ
1.How can I place an order for A6276EA through Aetrix?
Please submit a Request for Quotation (RFQ) for A6276EA 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 A6276EA reliable?
The price and inventory of A6276EA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6276EA is usually 5 days.
3.What payment methods are accepted for A6276EA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6276EA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6276EA?
A6276EA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6276EA 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 A6276EA?
For technical support, including A6276EA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6276EA requirements.
6.How does Aetrix verify that A6276EA is sourced from the original manufacturer or authorized distributors?
All A6276EA 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 A6276EA meets industry standards.
7.What is the process for return or replacement of A6276EA?
All A6276EA units undergo pre-shipment inspection (PSI). If there is an issue with A6276EA, 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 A6276EA part is unused and in its original packaging.
Return procedure for A6276EA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6276EA Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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