My Inquiry
My Account
Microchip Technology AT27LV040A-12JI
- Part No.:
- AT27LV040A-12JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT27LV040A-12JI.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,294
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT27LV040A-12JI from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM with 120 ns read access time, dual-voltage operation (3.0–3.6 V or 4.5–5.5 V), and industrial temperature range (–40°C to +85°C). It features CMOS/TTL-compatible I/O, 20 µA max standby current at 3.6 V, and JEDEC-standard 32-lead PLCC packaging - ideal for battery-powered portable systems requiring low-power nonvolatile storage.
For engineers reviewing the AT27LV040A-12JI datasheet, AT27LV040A-12JI pinout, AT27LV040A-12JI application, or AT27LV040A-12JI equivalent, key selection criteria include read timing consistency across voltage ranges, OTP reliability in embedded boot memory, compatibility with legacy AT27C040 programming infrastructure, and industrial-grade thermal stability without voltage derating.
Technical Context
The AT27LV040A-12JI implements a single-supply OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its address space spans A0–A18 (19 address lines), supporting full 512K-byte decoding without external logic.
It operates in five distinct modes - Read, Output Disable, Standby, Rapid Program, and Product Identification - each defined by specific CE/OE/VPP combinations. Programming requires VCC = 6.5 V and VPP = 13.0 V, while read/standby modes support either 3.3 V or 5 V supply rails without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports full boot code or firmware image storage in microcontroller-based systems |
| Read Access Time | 120 ns max at VCC = 3.0–3.6 V or 4.5–5.5 V - ensures deterministic timing in 8-bit bus interfaces up to 8.3 MHz |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - enables drop-in replacement in mixed-voltage legacy designs and battery-operated 3.3 V systems |
| Standby Current | 20 µA max at VCC = 3.6 V - reduces quiescent power in always-on embedded controllers |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation, automotive body electronics, and outdoor telemetry hardware |
| Programming Algorithm | Rapid™: 100 µs/byte typical - cuts production programming time vs. standard EPROMs, compatible with AT27C040 programmers |
| ESD/Latchup | 2,000 V HBM ESD protection; 200 mA latchup immunity - enhances field reliability in unshielded industrial environments |
Pinout & Package
AT27LV040A-12JI is supplied in a 32-lead Plastic Leaded Chip Carrier (PLCC) package per JEDEC MS-016 AE, with pin 1 index marked and lead finish compliant with RoHS exemption 7a (Pb-free except for high-melting-temperature solder).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus interface; fully decoded internally to select one of 524,288 bytes |
| O0–O7 | Data Outputs | 8-bit bidirectional data bus outputs; TTL-compatible VOH ≥ 2.4 V at IOH = –2.0 mA |
| CE | Chip Enable | Active-low chip select; controls device activation and entry into Rapid Program mode when pulsed |
| OE | Output Enable | Active-low output gate; allows output float during bus sharing without external tri-state logic |
| VCC | Power Supply | Primary supply input; must be applied simultaneously with or before VPP during programming |
| VPP | Programming Voltage | 13.0 V ± 0.25 V programming supply; requires external 0.1 µF capacitor to ground per datasheet |
| GND | Ground Reference | Signal and power return path; decoupling capacitor placement critical for transient suppression |
Key Features
| Feature | Design Value |
|---|---|
| Dual-voltage read compatibility | Operates identically at 3.3 V and 5 V - eliminates need for level shifters in hybrid-voltage backplanes |
| Rapid™ Programming | 100 µs/byte typical - reduces programming station dwell time and increases throughput in manufacturing |
| Integrated Product ID Code | Manufacturer byte 0x1E and device code 0x0B - enables automatic algorithm selection in industry-standard programmers |
| JEDEC-standard packages | 32J PLCC footprint - ensures PCB layout reuse across AT27C040 and AT27LV040A families |
| Low-power standby | <1 µA typical ICC at 3.3 V - extends battery life in portable instrumentation and remote sensors |
Applications
| Industrial PLC Firmware Storage | Medical Device Boot ROM |
|---|---|
Use Scenario: Storing immutable boot firmware and calibration tables in programmable logic controllers deployed in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Nonvolatile boot memory mapped to CPU address space; provides deterministic 120 ns read latency for cold-start execution. Use Value: Industrial temperature rating and 2,000 V ESD tolerance ensure reliable operation amid motor drive noise and electrostatic discharge in ungrounded enclosures. |
Use Scenario: Holding certified bootloader and safety-critical initialization routines in Class II medical diagnostic equipment requiring long-term data retention without refresh. IC Role / Device Role / Timing Role: OTP EPROM used as primary boot source; prevents accidental overwrite during field updates or service interventions. Use Value: One-time programmability guarantees firmware integrity over 20+ year product lifecycles, meeting IEC 62304 software safety requirements. |
| Automotive Body Control Module | Legacy Industrial Instrumentation |
Use Scenario: Storing configuration data and CAN protocol stack initialization parameters in under-hood body control units exposed to thermal cycling and vibration. IC Role / Device Role / Timing Role: Configuration memory accessed during power-up sequencing; supports both 5 V legacy MCU buses and newer 3.3 V SoCs. Use Value: Dual-voltage operation allows same BOM part across multiple vehicle platforms, reducing qualification overhead and inventory complexity. |
Use Scenario: Replacing obsolete AT27C040 in aging test equipment where board space and pinout are fixed but power efficiency must improve. IC Role / Device Role / Timing Role: Drop-in OTP EPROM replacement; maintains identical PLCC-32 footprint and JEDEC timing interface. Use Value: 20 µA max standby current reduces system-level leakage by >95% versus 5 V EPROMs, extending uptime in mains-powered lab gear. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT27C040-12JC | 5 V only (4.5–5.5 V); no 3.3 V operation; 100 ns access at 5 V | Limited to legacy 5 V systems; lacks low-power advantage for battery use | Select when existing 5 V infrastructure prohibits voltage rail changes and faster timing is required |
| MX29LV400CBTI-12G | Flash memory (not OTP); 3.0–3.6 V only; sector erase capability | Supports field firmware updates; requires different programming sequence and command set | Select when reprogrammability is mandatory and EEPROM-like endurance is acceptable |
Compared with AT27C040-12JC, the AT27LV040A-12JI delivers 3.3 V compatibility and lower standby power but trades off 10 ns speed; versus MX29LV400CBTI-12G, it offers simpler programming and guaranteed write-once behavior at the cost of update flexibility.
Availability
AT27LV040A-12JI is available at Aetrix Electronics and suitable for industrial PLC firmware storage, medical device boot ROM, and automotive body control module applications requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for AT27LV040A-12JI 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 (now part of Microchip Technology) is a fabless semiconductor company specializing in microcontrollers, nonvolatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27LV040A belongs to Atmel's low-voltage OTP EPROM product line, designed specifically to replace 5 V EPROMs in power-constrained and mixed-voltage embedded systems while maintaining full JEDEC pin and functional compatibility.
FAQ
What is the maximum operating frequency supported by AT27LV040A-12JI?
The AT27LV040A-12JI does not specify a maximum clock frequency, as it is an asynchronous memory device. Its timing is governed by access parameters: tACC ≤ 120 ns and tCE ≤ 120 ns define the minimum interval between address assertion and valid data output. In practice, this supports reliable operation on 8-bit buses running up to approximately 8.3 MHz (1/120 ns), assuming proper setup/hold margins and signal integrity.
Can AT27LV040A-12JI be programmed using standard AT27C040 programming equipment?
Yes, the AT27LV040A-12JI is fully programming-compatible with AT27C040 equipment. It uses the same Rapid™ algorithm, identical CE pulse timing (100 µs), and shares the same Integrated Product Identification Code (0x1E/0x0B), allowing automatic recognition and voltage profile selection in industry-standard programmers such as BP Microsystems or Xeltek units.
Does AT27LV040A-12JI require external decoupling capacitors, and if so, what values?
Yes, the AT27LV040A-12JI requires two decoupling capacitors per datasheet Section "System Considerations": a 0.1 µF high-frequency ceramic capacitor placed between VCC and GND as close to the PLCC pins as possible, plus a 4.7 µF bulk electrolytic capacitor near the power entry point of any board containing multiple AT27LV040A-12JI devices. These suppress transients during CE switching and stabilize the supply under load.
Is AT27LV040A-12JI pin-compatible with AT27LV040A-12TC or AT27LV040A-12VI?
No - AT27LV040A-12JI uses a 32-lead PLCC (32J) package, while AT27LV040A-12TC is in a 32-lead TSOP (32T) and AT27LV040A-12VI is in a 32-lead VSOP (32V). Though all share identical pin functions and electrical behavior, their physical footprints, lead pitch, and mounting methods differ; PCB redesign is required for substitution.
What is the purpose of the VPP pin on AT27LV040A-12JI, and when is it active?
The VPP pin on AT27LV040A-12JI supplies 13.0 V ± 0.25 V exclusively during programming and verification cycles. It is inactive (and may be tied to VCC) during normal read or standby operation. Per datasheet, VPP must be applied simultaneously with or after VCC and removed simultaneously with or before VCC to prevent latchup or damage.
AT27LV040A-12JI 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:
- 120 ns
- Voltage - Supply:
- 3V ~ 3.6V, 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)
AT27LV040A-12JI FAQ
1.How can I place an order for AT27LV040A-12JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV040A-12JI 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 AT27LV040A-12JI reliable?
The price and inventory of AT27LV040A-12JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV040A-12JI is usually 5 days.
3.What payment methods are accepted for AT27LV040A-12JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV040A-12JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV040A-12JI?
AT27LV040A-12JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV040A-12JI 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 AT27LV040A-12JI?
For technical support, including AT27LV040A-12JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV040A-12JI requirements.
6.How does Aetrix verify that AT27LV040A-12JI is sourced from the original manufacturer or authorized distributors?
All AT27LV040A-12JI 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 AT27LV040A-12JI meets industry standards.
7.What is the process for return or replacement of AT27LV040A-12JI?
All AT27LV040A-12JI units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV040A-12JI, 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 AT27LV040A-12JI part is unused and in its original packaging.
Return procedure for AT27LV040A-12JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT27LV040A-12JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
