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Microchip Technology AT27LV040A-12VC
- Part No.:
- AT27LV040A-12VC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.488", 12.40mm Width)
- Datasheet:
-
AT27LV040A-12VC.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32VSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,703
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Product details
Overview
AT27LV040A-12VC from Atmel is a 4-Mbit (512K × 8) one-time programmable EPROM optimized for low-voltage battery-powered systems, featuring 120 ns read access time at 3.0–3.6 V or 4.5–5.5 V, dual-supply compatibility, and JEDEC-standard 32-lead VSOP packaging. It delivers TTL-compatible outputs at 3.0 V and supports rapid programming at 100 µs/byte.
For engineers reviewing the AT27LV040A-12VC datasheet, AT27LV040A-12VC pinout, AT27LV040A-12VC application, or AT27LV040A-12VC equivalent, key selection criteria include its 120 ns access timing, 3.0–3.6 V / 4.5–5.5 V dual-voltage operation, 20 µA max standby current, 32-lead VSOP (8 × 14 mm) package, and OTP EPROM architecture with integrated product identification code.
Technical Context
The AT27LV040A-12VC implements a CMOS-based OTP EPROM architecture with two-line control (CE/OE), enabling bus contention avoidance in shared-memory systems. Its address space spans A0–A18 (19-bit), supporting full 512K-word decoding with byte-wide O0–O7 outputs.
It operates across commercial (0°C to 70°C) and industrial (−40°C to +85°C) temperature ranges, with verified read functionality under both 3.3 V ±10% and 5 V ±10% supply conditions. Programming requires VCC = 6.5 V and VPP = 13.0 V, using the Rapid™ algorithm with 100 µs CE pulses and per-byte verify loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 4,194,304 bits (512K × 8) - supports firmware storage for microcontroller boot code or configuration data. |
| Read Access Time | 120 ns max at VCC = 3.0–3.6 V or 4.5–5.5 V - enables direct interface with 8 MHz Z80 or 68K-family processors without wait states. |
| Supply Voltage Range | 3.0–3.6 V or 4.5–5.5 V - allows drop-in replacement in mixed-voltage legacy systems and portable 3.3 V designs. |
| Standby Current | 20 µA max (CMOS mode, CE = VCC ± 0.3 V) - extends battery life in always-on embedded controllers. |
| Active Power Dissipation | 36 mW max at 5 MHz, VCC = 3.6 V - reduces thermal load in dense PCB layouts versus 5 V EPROMs. |
| Programming Voltage | VPP = 13.0 ± 0.25 V, VCC = 6.5 ± 0.25 V - requires dedicated high-voltage programming circuitry; not field-reprogrammable. |
| Package | 32-lead VSOP (8 × 14 mm, JEDEC MO-142 BA) - surface-mount compatible with automated assembly and space-constrained modules. |
Pinout & Package
AT27LV040A-12VC is supplied in a 32-lead Very Small Outline Package (VSOP), measuring 8 mm × 14 mm, with gull-wing leads and JEDEC MO-142 BA compliance. Pin 1 is marked by a notch or index mark on the top surface.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address Inputs | 19-bit address bus accepting full 512K-word range; all must be stable before CE/OE assertion for valid read. |
| O0–O7 | Data Outputs | True TTL-level outputs compatible with 5 V logic even when VCC = 3.0 V; high-impedance when OE or CE inactive. |
| CE | Chip Enable | Active-low chip select; controls device activation and power state transition between active and standby modes. |
| OE | Output Enable | Active-low output gate; decouples data bus during read cycles to prevent contention in multi-device systems. |
| VCC | Power Supply | Primary supply input for logic and I/O; must be applied simultaneously with or before VPP during programming. |
| VPP | Programming Voltage | 13.0 V programming supply; internally disconnected during normal read operation; requires external 0.1 µF bypass capacitor. |
| GND | Ground Reference | Signal and power return path; requires local 0.1 µF ceramic decoupling capacitor per device per datasheet guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical programming time with automatic verify-and-reprogram loop - reduces production programming cycle time by >5× vs. standard EPROMs. |
| Dual-Voltage Read Operation | Functional at 3.0–3.6 V or 4.5–5.5 V without hardware modification - eliminates level-shifting in hybrid 3.3 V/5 V backplanes or plug-in cards. |
| Integrated Product Identification Code | Manufacturer ID (0x1E) and Device Code (0x0B) readable via A9/VH and A0 toggle - ensures correct algorithm selection in automated programmers. |
| JEDEC-Compatible Packages | 32-lead VSOP (8 × 14 mm), TSOP (8 × 20 mm), and PLCC footprints - enables layout reuse across form factors and sourcing flexibility. |
| High-Reliability CMOS Process | 2000 V HBM ESD rating and 200 mA latchup immunity - sustains robust operation in industrial environments with noisy power rails. |
Applications
| Industrial PLC Firmware Storage | Legacy Embedded System Boot ROM |
|---|---|
|
Use Scenario: Storing fixed ladder logic firmware in DIN-rail mounted programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile boot memory holding initialization code executed by an 8051 or 68HC11 microcontroller at power-up. Use Value: 120 ns access time eliminates wait states for 8 MHz CPU clocks; industrial −40°C to +85°C rating ensures reliability across ambient extremes. |
Use Scenario: Replacing obsolete 27C400 EPROMs in medical diagnostic equipment where firmware updates are infrequent but long-term data retention is critical. IC Role / Device Role / Timing Role: One-time programmable read-only memory providing tamper-resistant, unalterable system startup instructions. Use Value: Dual-voltage support allows seamless integration into existing 5 V boards while enabling future 3.3 V redesigns without board respin. |
| Portable Test Instrument Configuration | Automotive Diagnostic Module Memory |
|
Use Scenario: Holding calibration tables and sensor compensation coefficients in handheld multimeters and oscilloscope probes powered by lithium coin cells. IC Role / Device Role / Timing Role: Low-power OTP storage accessed only during instrument initialization or self-test routines. Use Value: 20 µA max standby current extends battery life beyond 10 years; 3.0 V minimum operation matches primary cell discharge curve. |
Use Scenario: Storing vehicle-specific diagnostic protocol stacks (e.g., ISO 9141, SAE J1850) in aftermarket OBD-II scan tools deployed in automotive service bays. IC Role / Device Role / Timing Role: Immutable firmware repository ensuring consistent communication behavior across vehicle model years. Use Value: 2000 V ESD protection withstands repeated handling in static-prone workshop environments; VSOP package fits compact handheld enclosures. |
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; same 120 ns speed and 32-lead PLCC package. | Requires 5 V supply rail; unsuitable for battery-powered or mixed-voltage systems. | Select when legacy 5 V design prohibits voltage scaling and PLCC footprint is fixed. |
| MX29LV400CBTI-12G | Flash memory (reprogrammable), 3.0–3.6 V only, 120 ns access, 48-pin TSOP; lacks VPP pin and OTP security. | Supports field firmware updates but introduces erase-cycle wear-out and potential corruption risk. | Select when reprogrammability outweighs OTP's immutability and security guarantees. |
Compared with AT27C040-12JC, the AT27LV040A-12VC adds 3.3 V operation and lower standby power, while MX29LV400CBTI-12G trades OTP permanence for reprogrammability-making AT27LV040A-12VC optimal for cost-sensitive, security-critical, battery-operated firmware storage where update frequency is zero.
Availability
AT27LV040A-12VC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy embedded system boot ROM, and portable test instrument configuration requiring stable component supply, long-lifecycle availability, and JEDEC-standard VSOP packaging.
Supply support for AT27LV040A-12VC 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 semiconductor manufacturer 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 for battery-powered and mixed-voltage embedded systems needing reliable, low-power, immutable firmware storage without reprogramming capability.
FAQ
What is the maximum read access time specified for the AT27LV040A-12VC?
The AT27LV040A-12VC has a maximum read access time of 120 ns under both 3.0–3.6 V and 4.5–5.5 V supply conditions, as confirmed in the AC Characteristics table. This timing applies to address-to-output delay (tACC) and CE-to-output delay (tCE), ensuring compatibility with 8 MHz bus systems without wait-state insertion. The "-12" suffix explicitly denotes this 120 ns speed grade.
Does the AT27LV040A-12VC support true 3.3 V operation with TTL-compatible outputs?
Yes, the AT27LV040A-12VC operates fully at 3.0–3.6 V and produces TTL-compatible output levels (VOH ≥ 2.4 V, VOL ≤ 0.4 V) even when VCC = 3.0 V, allowing direct interfacing with standard 5 V TTL logic without level shifters. This is verified in the DC Operating Characteristics table for both 3.3 V and 5 V supply ranges.
Can the AT27LV040A-12VC be programmed in-system, or does it require a dedicated programmer?
The AT27LV040A-12VC requires a dedicated EPROM programmer capable of supplying VPP = 13.0 V and VCC = 6.5 V during programming, as specified in the DC Programming Characteristics table. In-system programming is not supported-the device lacks internal charge pumps or command-based write protocols, and VPP must be externally applied.
What package type does the AT27LV040A-12VC use, and is it RoHS-compliant?
The AT27LV040A-12VC uses a 32-lead Very Small Outline Package (VSOP) per JEDEC MO-142 BA, measuring 8 mm × 14 mm. While the original 1998 datasheet predates RoHS, current production lots from Microchip (as successor to Atmel) are RoHS-compliant and halogen-free; full compliance documentation is available upon request for AT27LV040A-12VC shipments.
How does the Integrated Product Identification Code function in the AT27LV040A-12VC?
The AT27LV040A-12VC implements a two-byte identification code: Manufacturer ID (0x1E) and Device Code (0x0B), accessed by setting A9 = VH (12.0 V) and toggling A0 while holding all other address lines low. This feature enables automated programmers to auto-detect the device and select correct algorithms-ensuring reliable programming of AT27LV040A-12VC without manual configuration.
AT27LV040A-12VC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.488", 12.40mm Width)
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-VSOP
AT27LV040A-12VC FAQ
1.How can I place an order for AT27LV040A-12VC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27LV040A-12VC 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-12VC reliable?
The price and inventory of AT27LV040A-12VC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27LV040A-12VC is usually 5 days.
3.What payment methods are accepted for AT27LV040A-12VC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27LV040A-12VC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27LV040A-12VC?
AT27LV040A-12VC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27LV040A-12VC 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-12VC?
For technical support, including AT27LV040A-12VC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27LV040A-12VC requirements.
6.How does Aetrix verify that AT27LV040A-12VC is sourced from the original manufacturer or authorized distributors?
All AT27LV040A-12VC 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-12VC meets industry standards.
7.What is the process for return or replacement of AT27LV040A-12VC?
All AT27LV040A-12VC units undergo pre-shipment inspection (PSI). If there is an issue with AT27LV040A-12VC, 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-12VC part is unused and in its original packaging.
Return procedure for AT27LV040A-12VC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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