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Allegro MicroSystems A6595KA
- Part No.:
- A6595KA
- Manufacturer:
- Allegro MicroSystems
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
A6595KA.pdf
- Description:
- IC PWR DRIVER N-CHAN 1:8 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,573
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Product details
Overview
A6595KA from Allegro MicroSystems is an 8-bit serial-input DMOS power driver IC integrating a CMOS shift register, data latches, control logic, and eight open-drain output drivers. It sinks up to 250 mA per output continuously at 125°C ambient, features 1.3 Ω typical rDS(on), 50 V output clamp voltage, and supports >5 MHz serial data rates. It drives relays, solenoids, and medium-current peripheral loads in industrial control modules.
For engineers reviewing the A6595KA datasheet, A6595KA pinout, A6595KA application, or A6595KA equivalent, key selection considerations include its 20-pin DIP package, active-low OUTPUT ENABLE and STROBE, CMOS serial cascade capability, thermal derating above 25°C, and discontinuation status for new designs.
Technical Context
The A6595KA implements a serial-to-parallel conversion architecture: data shifts into an 8-bit CMOS shift register on rising CLOCK edges, then transfers to D-type latches on rising STROBE edges. Output drivers are DMOS open-drain sinks with independent enable control via active-low OUTPUT ENABLE.
All eight outputs share common POWER GROUND terminals (pins 1, 10, 11, 20), require external connection of all five ground pins, and operate with logic supply (VDD) from 4.5 V to 5.5 V. The device includes REGISTER CLEAR (active-low) and supports cascading via SERIAL DATA OUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Type | Eight open-drain DMOS sink drivers, each rated 250 mA continuous at 125°C ambient |
| rDS(on) | 1.3 Ω typical at 250 mA, 4.5 V VDD; enables low conduction loss in high-side load switching |
| Output Clamp Voltage | 50 V minimum; protects against inductive kickback in relay/solenoid drive |
| Serial Data Rate | Over 5 MHz; supports fast microprocessor interface without timing bottlenecks |
| Logic Supply Range | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS systems |
| Thermal Resistance | RθJA = 32 °C/W on 4-layer JEDEC PCB; defines power dissipation limit vs. ambient temperature |
| Package | 20-pin plastic DIP (suffix A); Pb-free with 100% matte tin plating, copper leadframe |
Pinout & Package
Package: 20-pin dual in-line plastic package (DIP), Pb-free, 100% matte tin leadframe plating, copper base material.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10, 11, 20 | POWER GROUND | Common reference for all DMOS output voltage measurements; must be externally tied together |
| 2 | LOGIC SUPPLY (VDD) | 5 V nominal logic rail; powers shift register, latches, and control logic |
| 3 | SERIAL DATA IN | CMOS-level serial input feeding 8-bit shift register on rising CLOCK edge |
| 4–7, 14–17 | OUT0–OUT7 | Eight independent open-drain DMOS sink outputs; each drives one load to POWER GROUND |
| 8 | REGISTER CLEAR (CLR) | Active-low asynchronous reset; forces all shift register bits low regardless of clock/strobe |
| 9 | OUTPUT ENABLE (OE) | Active-low global output enable; disables all DMOS drivers when high (blanking mode) |
| 12 | STROBE (ST) | Rising-edge-triggered latch control; transfers shift register contents to output latches |
| 13 | CLOCK (CLK) | Rising-edge clock for serial data shifting; minimum pulse width 20 ns |
| 18 | SERIAL DATA OUT | CMOS-level serial output for daisy-chaining multiple A6595KA devices |
| 19 | LOGIC GROUND | Reference for all logic inputs (CLK, ST, OE, CLR, SDI); separate from POWER GROUND |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Serial-to-Parallel Conversion | Eliminates need for external latching logic; reduces BOM count and board space in multi-load control |
| High-Voltage Inductive Load Protection | 50 V output clamp voltage enables direct driving of 24 V/48 V relays and solenoids without external flyback diodes |
| Thermally Robust Operation | Rated for 250 mA continuous per output at 125°C ambient; supports industrial environments without forced cooling |
| Low rDS(on) Power Efficiency | 1.3 Ω typical on-resistance minimizes I²R losses and self-heating during sustained load activation |
| Cascadable Serial Interface | SERIAL DATA OUT allows expansion to >8 outputs using identical A6595KA devices without additional controller pins |
Applications
| Industrial PLC I/O Modules | Automated Test Equipment (ATE) Load Switching |
|---|---|
Use Scenario: Controlling 8 discrete 24 V DC solenoids in a programmable logic controller rack module. IC Role / Device Role / Timing Role: A6595KA acts as the final-stage serially addressed power switch, translating microcontroller GPIO commands into timed, current-sinking drive signals. Use Value: Enables compact, low-cost I/O expansion using only three MCU pins (CLK, SDI, ST), while handling 250 mA per channel at full ambient temperature range. |
Use Scenario: Sequencing power delivery to DUT test fixtures requiring precise timing and isolation between channels. IC Role / Device Role / Timing Role: A6595KA provides synchronized, strobe-gated output activation with <50 ns setup/hold timing margins relative to STROBE. Use Value: Delivers deterministic turn-on/turn-off behavior across all eight channels, supporting repeatable test cycles without cross-talk or timing skew. |
| Factory Automation Relay Boards | Medical Diagnostic Instrument Peripherals |
Use Scenario: Driving electromechanical relays in a DIN-rail mounted control panel for HVAC and conveyor subsystems. IC Role / Device Role / Timing Role: A6595KA serves as the isolated, high-voltage-tolerant interface between low-voltage logic and 120 V AC relay coils via external optocouplers or solid-state relays. Use Value: Its 50 V output clamp voltage suppresses inductive transients, reducing relay contact arcing and extending service life in high-cycle applications. |
Use Scenario: Managing auxiliary power sequencing for sensor calibration circuits and signal conditioning stages in portable diagnostic gear. IC Role / Device Role / Timing Role: A6595KA functions as a digitally controlled, low-noise power gate-activated only during calibration phases to minimize standby power draw. Use Value: Achieves <150 μA supply current in OFF state and <300 μA when all outputs are active, supporting battery-operated instrument runtime targets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit serial-input power driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPIC6595N | Same pinout and function; Texas Instruments part discontinued earlier; higher rDS(on) (1.8 Ω typ) and lower thermal rating (100°C max ambient) | Not suitable for continuous 250 mA operation above 85°C ambient; requires larger heatsinking | Select A6595KA where extended temperature range and lower conduction loss are required. |
| TPIC6595DW | SOIC-20 package variant; identical electrical specs but different thermal resistance (RθJA = 65 °C/W); no Pb-free plating | Lower power density limits total simultaneous output current in compact layouts; incompatible with Pb-free assembly processes | Choose A6595KA for through-hole mounting, RoHS compliance, and superior thermal performance on standard PCBs. |
Compared with TPIC6595N and TPIC6595DW, the A6595KA delivers higher ambient temperature capability (125°C vs. 100°C), lower on-resistance (1.3 Ω vs. 1.8 Ω), and certified Pb-free construction-making it the preferred option for thermally demanding, RoHS-compliant industrial designs despite end-of-life status.
Availability
A6595KA is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automated test equipment load switching, and factory automation relay boards requiring stable component supply despite its discontinued status.
Supply support for A6595KA 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 sensing and power IC solutions, headquartered in Worcester, Massachusetts.
The A6595KA belongs to Allegro's legacy DMOS power driver product line, engineered specifically for robust, serially controlled switching of inductive and resistive loads in industrial control and automation systems.
FAQ
Is the A6595KA still in production?
No, the A6595KA is a discontinued product. Allegro MicroSystems ceased production as of May 3, 2010. It is not recommended for new design applications, and samples are no longer available. Aetrix Electronics maintains limited legacy stock for existing production continuity support.
What is the maximum continuous current per output for the A6595KA?
The A6595KA is rated for 250 mA continuous current per output when all eight outputs are active and ambient temperature is ≤125°C. This rating assumes proper PCB thermal design per JEDEC 4-layer standard (RθJA = 32 °C/W). Derating is required above 25°C ambient.
Can the A6595KA drive 24 V relay coils directly?
Yes, the A6595KA can drive 24 V relay coils directly due to its 50 V minimum output clamp voltage, which safely absorbs inductive kickback. No external flyback diode is required, though layout best practices (short traces, local decoupling) are recommended to maintain stability.
Does the A6595KA support daisy-chaining with other devices?
Yes, the A6595KA supports daisy-chaining via its CMOS SERIAL DATA OUT (pin 18), which connects directly to the SERIAL DATA IN of the next A6595KA in the chain. This enables expansion beyond 8 outputs using a single serial bus and three control lines (CLK, ST, OE).
What is the function of the REGISTER CLEAR (CLR) pin on the A6595KA?
The REGISTER CLEAR (pin 8) is an active-low asynchronous input that forces all bits in the internal 8-bit shift register to logic low, regardless of CLOCK or STROBE activity. It provides hardware-level initialization or emergency reset capability independent of serial data flow in the A6595KA.
A6595KA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Switch Type:
- Latched Driver
- Number of Outputs:
- 8
- Ratio - Input:Output:
- 1:8
- Output Configuration:
- Low Side
- Output Type:
- N-Channel
- Interface:
- Strobe, Serial
- Voltage - Load:
- 50V (Max)
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 5.5V
- Current - Output (Max):
- 250mA
- Rds On (Typ):
- 1.3Ohm
- Input Type:
- Non-Inverting
- Features:
- -
- Fault Protection:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
A6595KA FAQ
1.How can I place an order for A6595KA through Aetrix?
Please submit a Request for Quotation (RFQ) for A6595KA 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 A6595KA reliable?
The price and inventory of A6595KA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for A6595KA is usually 5 days.
3.What payment methods are accepted for A6595KA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for A6595KA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for A6595KA?
A6595KA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your A6595KA 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 A6595KA?
For technical support, including A6595KA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your A6595KA requirements.
6.How does Aetrix verify that A6595KA is sourced from the original manufacturer or authorized distributors?
All A6595KA 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 A6595KA meets industry standards.
7.What is the process for return or replacement of A6595KA?
All A6595KA units undergo pre-shipment inspection (PSI). If there is an issue with A6595KA, 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 A6595KA part is unused and in its original packaging.
Return procedure for A6595KA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
A6595KA Tags
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ULN2003APWR
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