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Microchip Technology AT27C040-70JI
- Part No.:
- AT27C040-70JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27C040-70JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,517
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Product details
Overview
AT27C040-70JI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 70 ns read access time, 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It features dual-line control (CE/OE), CMOS/TTL-compatible I/O, and integrated product identification code for automated programming. Used in legacy microprocessor boot memory and firmware storage where non-volatility and long-term data retention are critical.
For engineers reviewing the AT27C040-70JI datasheet, AT27C040-70JI pinout, AT27C040-70JI application, or AT27C040-70JI equivalent, key selection factors include its 70 ns read timing, VPP = 12.0 V programming voltage, 100 µA max standby current, JEDEC-standard PLCC-32 package, and industrial-grade reliability with 2000V ESD protection.
Technical Context
The AT27C040-70JI implements a standard OTP EPROM architecture with address decoding for A0–A18 (19-bit addressing), 8-bit parallel data outputs (O0–O7), and two active-low control lines: Chip Enable (CE) and Output Enable (OE). Its Rapid™ Programming Algorithm uses 100 µs/byte CE pulses at VPP = 13.0 V and VCC = 6.5 V for reliable byte-wise programming.
It supports three distinct operating modes: Read (CE = OE = VIL), Standby (CE = VIH), and Rapid Program (CE = VIL, OE = VIH, VPP = 13.0 V). Product identification is accessed by asserting A9 = 12.0 V while holding A1–A18 = VIL and toggling A0 to select Manufacturer ID (0x1E) or Device Code (0x0B).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full 19-bit address space for boot ROM in 8-bit/16-bit microcontrollers |
| Read Access Time | 70 ns - enables direct interface to 12 MHz+ Z80, 8086, or 68000-based systems without wait states |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails; no auxiliary voltage required for read operation |
| Standby Current | 100 µA max - minimizes power draw in idle firmware storage applications |
| Programming Voltage (VPP) | 12.0 V ±0.5 V - requires dedicated high-voltage supply during programming; not used in read mode |
| ESD Protection | 2000V HBM - ensures robustness during handling and PCB assembly in industrial environments |
| Operating Temperature | –40°C to +85°C - qualified for industrial control, instrumentation, and automotive under-hood ancillary modules |
Pinout & Package
AT27C040-70JI is supplied in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), JEDEC MS-016 variation AE compliant, with pin 1 marked by a corner notch. The package is surface-mountable, lead coplanarity ≤0.102 mm, and body dimensions 12.57 mm × 15.11 mm × 3.56 mm (L × W × H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded to select one of 524,288 bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus in read mode; high-impedance when CE or OE inactive |
| CE | Chip Enable | Active-low global enable; disables outputs and reduces current to 100 µA in standby |
| OE | Output Enable | Active-low output gate; allows shared bus operation without external tri-state logic |
| VPP | Programming Voltage | 12.0 V input required only during programming; must be applied after VCC and removed before VCC |
| VCC | Power Supply | +5V supply for both read and program modes; decoupling requires 0.1 µF ceramic + 4.7 µF bulk capacitor |
| GND | Ground | Reference for all signals and supplies; separate ground plane recommended for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with auto-verify loop - reduces firmware update cycle time in production programming |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9 = 12.0 V - enables automatic algorithm selection in universal programmers |
| Two-Line Control (CE/OE) | Independent chip and output gating - eliminates bus contention in multi-device memory maps |
| CMOS/TTL-Compatible I/O | VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, VOH ≥ 2.4 V - interoperable with legacy 5V microcontrollers and FPGAs |
| High-Reliability Process | 200 mA latchup immunity and 2000V HBM ESD rating - suitable for harsh industrial environments with noisy power rails |
Applications
| Industrial PLC Firmware Storage | Legacy Microcontroller Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder logic and I/O configuration in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Non-volatile boot memory providing immediate instruction fetch on power-up; accessed via 8-bit data bus and 19-bit address bus. Use Value: Guarantees deterministic startup behavior and firmware integrity over 10+ years without battery backup or refresh cycles. | Use Scenario: Holding initialization code and interrupt vectors for Z80 or 8086-based embedded controllers in test equipment. IC Role / Device Role / Timing Role: Primary read-only memory mapped at reset vector address; 70 ns access eliminates WAIT state insertion. Use Value: Enables full-speed CPU execution from power-on, reducing system boot latency to sub-millisecond levels. |
| Automotive Diagnostic Module Memory | Avionics Configuration Data Storage |
Use Scenario: Storing diagnostic protocol stacks and calibration tables in OBD-II scan tools operating across vehicle fleets. IC Role / Device Role / Timing Role: Static firmware repository accessed only during module initialization; operates within –40°C to +85°C ambient range. Use Value: Meets AEC-Q100-relevant reliability requirements for non-safety-critical automotive electronics without EEPROM wear-out concerns. | Use Scenario: Retaining aircraft-specific configuration parameters (e.g., sensor offsets, display layouts) in flight data recorders and cockpit displays. IC Role / Device Role / Timing Role: Tamper-resistant, radiation-tolerant read-only storage; programmed once during final test and never rewritten in field. Use Value: Eliminates rewrite failures and data corruption risks associated with flash or EEPROM in high-reliability avionics subsystems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C040-70DC | Same 4-Mbit (512K × 8) OTP EPROM, 70 ns access, but uses AMD's process; VPP = 12.5 V, ICC active = 35 mA max | Requires adjusted programming voltage and higher active current; identical pinout and timing in read mode | Select when existing AMD-programmer infrastructure is in place and 5 mA higher active current is acceptable |
| MX27C4001-70PC | 4-Mbit OTP EPROM with 70 ns access, Macronix part; VPP = 12.5 V, ISB = 200 µA max, PLCC-32 package | Slightly higher standby current; same JEDEC pinout and AC timing, but product ID code differs | Choose for second-source availability where 100 µA vs. 200 µA standby is not critical in the system design |
Compared with AM27C040-70DC and MX27C4001-70PC, the AT27C040-70JI offers the lowest standby current (100 µA) and verified Rapid™ programming compatibility with industry-standard programmers, making it optimal for power-sensitive industrial firmware storage where programming repeatability is essential.
Availability
AT27C040-70JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy microcontroller boot ROM, and automotive diagnostic module memory requiring stable component supply across extended product lifecycles.
Supply support for AT27C040-70JI 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
Atmel Corporation was a U.S.-based semiconductor company specializing in microcontrollers, non-volatile memory, and programmable logic, acquired by Microchip Technology in 2016.
The AT27C040-70JI belongs to Atmel's OTP EPROM product line, designed specifically for cost-effective, high-reliability firmware storage in industrial, automotive, and legacy computing systems where reprogrammability is unnecessary and data permanence is mandatory.
FAQ
What is the programming voltage requirement for AT27C040-70JI?
The AT27C040-70JI requires VPP = 12.0 V ±0.5 V during programming, applied only after VCC is stable and removed before VCC. This voltage is not used during normal read operation. Programming must follow the Rapid™ Algorithm with 100 µs CE pulses and verification loops. The AT27C040-70JI datasheet specifies VID on A9 at 11.5–12.5 V for product identification mode.
Does AT27C040-70JI support standard 5V microprocessor buses without level shifting?
Yes, AT27C040-70JI features CMOS and TTL-compatible inputs and outputs: VIL ≤ 0.8 V, VIH ≥ 2.0 V, VOL ≤ 0.4 V, and VOH ≥ 2.4 V at specified loads. This ensures direct interfacing with 5V Z80, 8086, 68000, and FPGA-based controllers without external level translators. The AT27C040-70JI operates on a single 5V ±10% supply in read mode.
What package type is used for AT27C040-70JI?
The AT27C040-70JI is packaged in a 32-lead Plastic J-Leaded Chip Carrier (PLCC-32), JEDEC MS-016 variation AE compliant. It has a body size of 12.57 mm × 15.11 mm, 0.102 mm max lead coplanarity, and pin 1 identified by a corner notch. This surface-mount package supports reflow soldering and is pin-compatible with other AT27C040 variants in PLCC-32.
How does the Integrated Product Identification Code work on AT27C040-70JI?
The AT27C040-70JI embeds a Manufacturer ID (0x1E) and Device Code (0x0B) accessible by setting A9 = 12.0 V while holding A1–A18 = VIL and toggling A0. This feature allows automated programming equipment to detect the device type and apply correct algorithms and voltages. The AT27C040-70JI uses this code to ensure reliable, error-free programming across production lines.
Is AT27C040-70JI suitable for industrial temperature applications?
Yes, AT27C040-70JI is rated for industrial temperature operation from –40°C to +85°C, with guaranteed 70 ns read access time and 100 µA max standby current across this range. Its 2000V HBM ESD rating and 200 mA latchup immunity further validate suitability for factory automation, motor drives, and outdoor instrumentation where thermal cycling and electrical noise are present. The AT27C040-70JI meets these specs without derating.
AT27C040-70JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 70 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT27C040-70JI FAQ
1.How can I place an order for AT27C040-70JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C040-70JI 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 AT27C040-70JI reliable?
The price and inventory of AT27C040-70JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C040-70JI is usually 5 days.
3.What payment methods are accepted for AT27C040-70JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C040-70JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C040-70JI?
AT27C040-70JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C040-70JI 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 AT27C040-70JI?
For technical support, including AT27C040-70JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C040-70JI requirements.
6.How does Aetrix verify that AT27C040-70JI is sourced from the original manufacturer or authorized distributors?
All AT27C040-70JI 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 AT27C040-70JI meets industry standards.
7.What is the process for return or replacement of AT27C040-70JI?
All AT27C040-70JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27C040-70JI, 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 AT27C040-70JI part is unused and in its original packaging.
Return procedure for AT27C040-70JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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