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Microchip Technology AT27C020-12TC
- Part No.:
- AT27C020-12TC
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-TFSOP (0.724", 18.40mm Width)
- Datasheet:
-
AT27C020-12TC.pdf
- Description:
- IC EPROM 2MBIT PARALLEL 32TSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,830
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Product details
Overview
AT27C020-12TC from Atmel is a 2-Mbit (256K × 8) one-time programmable EPROM optimized for high-speed microprocessor systems, featuring 120 ns read access time, 5V ±10% single-supply operation, and JEDEC-standard 32-lead TSOP packaging. It delivers low active current (25 mA at 5 MHz) and ultra-low standby current (100 µA max), enabling reliable firmware storage in space-constrained industrial controllers and legacy embedded systems.
For engineers reviewing the AT27C020-12TC datasheet, AT27C020-12TC pinout, AT27C020-12TC application, or AT27C020-12TC equivalent, key selection criteria include verified 120 ns tACC timing, dual-line control (CE/OE) for bus contention prevention, Rapid™ programming at 100 µs/byte, integrated product identification code, and automotive-grade (-40°C to 125°C) temperature support in TSOP package.
Technical Context
The AT27C020-12TC implements a CMOS-based OTP EPROM architecture with 18 address lines (A0–A17) supporting 256K-byte addressing and 8-bit parallel data outputs (O0–O7). Its two-line enable scheme (CE and OE) enables flexible memory mapping without external logic.
Programming requires VPP = 13.0 V ±0.25 V and VCC = 6.5 V ±0.25 V, with a 100 µs PGM pulse width and up to 10 reprogramming attempts per byte. Product identification uses A9 voltage sensing (11.5–12.5 V) and A0 toggling to select manufacturer (0x1E) or device code (0x86).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2,097,152 bits (256K × 8) - supports full firmware images for 8-bit microcontrollers without bank switching |
| Read Access Time (tACC) | 120 ns max - eliminates WAIT states on 8-MHz Z80 or 68K-based systems |
| Supply Voltage | 5V ±10% - compatible with standard TTL/CMOS logic rails without regulation overhead |
| Active Current (ICC) | 25 mA max at 5 MHz - enables use in thermally constrained industrial modules |
| Standby Current (ISB1) | 100 µA max (CMOS CE) - extends battery backup duration in non-volatile configuration storage |
| Programming Voltage (VPP) | 13.0 V ±0.25 V - requires dedicated programming supply but avoids on-chip charge pumps |
| ESD Protection | 2,000V HBM - ensures robustness during manual handling and board assembly |
Pinout & Package
AT27C020-12TC is housed in a 32-lead Plastic Thin Small Outline Package (TSOP, Type 1, JEDEC MO-142 BD), 11.8 mm × 10.0 mm × 1.0 mm, with gull-wing leads and pin 1 index mark.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus interface; A0–A17 fully decoded to select one of 256K bytes |
| O0–O7 | Data Outputs | True TTL/CMOS-compatible bidirectional data bus drivers (no internal latches) |
| CE | Chip Enable | Primary chip-select; device enters standby when high, enabling multi-chip decoding |
| OE | Output Enable | Secondary gate; controls output buffer tristate independently of CE for bus sharing |
| PGM | Program Strobe | Active-low programming pulse input; initiates 100 µs write cycle when VPP = 13 V |
| VPP | Programming Supply | 13 V programming voltage input; must be applied after and removed before VCC |
| VCC | Power Supply | 5 V ±10% main supply; powers logic and output buffers during read and program modes |
| GND | Ground | Reference return for all signals; requires local 0.1 µF ceramic decoupling per device |
Key Features
| Feature | Design Value |
|---|---|
| Rapid™ Programming Algorithm | 100 µs/byte typical - reduces production programming time by >90% vs. legacy EPROMs |
| Integrated Product ID Code | Manufacturer ID (0x1E) + Device ID (0x86) - enables auto-detection in universal programmers |
| Two-Line Control (CE/OE) | Independent enable hierarchy - prevents bus contention during partial decode or shared data bus operation |
| High-Reliability Process | 200 mA latch-up immunity - ensures survival under transient overcurrent events in motor-control environments |
| Temperature Ranges | Industrial (-40°C to +85°C) and Automotive (-40°C to +125°C) options - validated for under-hood and factory-floor deployment |
Applications
| Industrial PLC Firmware Storage | Legacy Medical Device Boot ROM |
|---|---|
Use Scenario: Storing fixed ladder-logic firmware in DIN-rail mounted programmable logic controllers with no field update requirement. IC Role / Device Role / Timing Role: Non-volatile boot memory providing deterministic 120 ns read latency to 8051-based controller core. Use Value: Eliminates need for external wait-state generators and supports direct execution from ROM in cost-sensitive automation hardware. |
Use Scenario: Holding certified diagnostic firmware in Class II medical instruments where reprogramming is prohibited post-certification. IC Role / Device Role / Timing Role: One-time programmable ROM ensuring immutable code integrity and regulatory traceability. Use Value: Meets IEC 62304 software lifecycle requirements via hardware-enforced write-protection and ESD-hardened packaging. |
| Automotive Body Control Module | Avionics Configuration Memory |
Use Scenario: Storing vehicle-specific calibration tables and CAN node configuration in body control units operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: Automotive-grade OTP EPROM delivering guaranteed 120 ns access under thermal stress and vibration. Use Value: Replaces UV-erasable EPROMs with superior moisture resistance and no window-sealing dependency. |
Use Scenario: Retaining flight-critical configuration data in airborne navigation subsystems requiring DO-254 compliance. IC Role / Device Role / Timing Role: Radiation-tolerant (non-flash) non-volatile memory with verified 2,000V HBM ESD rating for avionics backplanes. Use Value: Avoids flash wear-out mechanisms and provides deterministic read timing unaffected by erase-cycle history. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar OTP EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C256B-120EC | 256K × 8, 120 ns, 5V, 32-pin PDIP/PLCC only - no TSOP option; higher standby current (200 µA) | Lacks automotive temp grade and integrated ID code; requires external programming voltage sequencing | Select when PDIP/PLCC footprint compatibility is mandatory and TSOP space savings are not required |
| MX27C256-12PC | 256K × 8, 120 ns, 5V, 32-pin PDIP only - no PLCC/TSOP variants; no Rapid™ algorithm or ID code | No automotive grade; programming requires 21 V VPP and longer cycles (500 µs/byte) | Choose only for legacy repair scenarios where exact AMI-era pinout and programming tooling are preserved |
Compared with AM27C256B-120EC and MX27C256-12PC, the AT27C020-12TC offers TSOP packaging for density-constrained designs, built-in product ID for automated programming, and Rapid™ programming for faster manufacturing throughput - making it the preferred choice for new industrial and automotive designs requiring modern packaging and process efficiency.
Availability
AT27C020-12TC is available at Aetrix Electronics and suitable for industrial PLC firmware storage, legacy medical device boot ROM, and automotive body control module applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AT27C020-12TC 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, non-volatile memory, and secure authentication ICs for industrial, automotive, and consumer applications.
The AT27C020-12TC belongs to Atmel's 27C-series OTP EPROM product line, designed specifically to replace UV-erasable EPROMs with enhanced reliability, simplified programming, and JEDEC-standard packaging for legacy system upgrades and long-lifecycle embedded deployments.
FAQ
What is the maximum operating temperature range supported by the AT27C020-12TC?
The AT27C020-12TC is rated for industrial operation from -40°C to +85°C. While the base AT27C020 family includes automotive-grade variants up to +125°C, the -12TC suffix specifically denotes the commercial/industrial version with 120 ns speed grade in TSOP package - its datasheet specifies -40°C to +85°C as the qualified operating range. Always verify temperature grade against the full ordering code (e.g., -12TI for industrial, -12TA for automotive).
Does the AT27C020-12TC require a separate programming voltage during normal read operation?
No. The AT27C020-12TC operates from a single 5V ±10% supply during read mode. VPP (13.0 V ±0.25 V) is required only during programming and must be applied after VCC and removed before VCC. In read mode, VPP may be tied to VCC, but doing so increases total supply current since IPP adds to ICC - the datasheet confirms VPP = VCC is permissible only if the combined current budget allows.
How does the Rapid™ Programming Algorithm improve production yield for the AT27C020-12TC?
The Rapid™ Programming Algorithm improves yield by implementing per-byte verification and adaptive reprogramming: each byte receives one 100 µs PGM pulse, then undergoes verification; if failed, up to nine additional pulses are applied with verification after each. This avoids blanket over-programming and identifies marginal cells early, reducing overall programming time and preventing latent failures that would manifest only after extended operation - a critical advantage in high-reliability industrial firmware deployment.
Can the AT27C020-12TC be used as a drop-in replacement for the AT27C256 in existing PCB layouts?
No. Although both are 256K × 8 OTP EPROMs, the AT27C020-12TC has 18 address lines (A0–A17) versus 15 (A0–A14) on the AT27C256, requiring different address decoding and larger memory maps. Additionally, AT27C020-12TC uses 32-pin TSOP while AT27C256 commonly uses 28-pin DIP/PLCC. Pin count, pinout, and addressing differ fundamentally - redesign is required for migration.
What decoupling capacitance is required for stable operation of the AT27C020-12TC?
The AT27C020-12TC requires a minimum 0.1 µF high-frequency ceramic capacitor between VCC and GND, placed as close as possible to the device pins. For systems with multiple AT27C020-12TC devices or high-current peripherals, a 4.7 µF bulk electrolytic capacitor should also be added near the power entry point. These values are specified in the "System Considerations" section to suppress transients during CE switching and ensure voltage stability within datasheet limits.
AT27C020-12TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-TFSOP (0.724", 18.40mm Width)
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - OTP
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 120 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TSOP
AT27C020-12TC FAQ
1.How can I place an order for AT27C020-12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for AT27C020-12TC 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 AT27C020-12TC reliable?
The price and inventory of AT27C020-12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT27C020-12TC is usually 5 days.
3.What payment methods are accepted for AT27C020-12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT27C020-12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT27C020-12TC?
AT27C020-12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT27C020-12TC 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 AT27C020-12TC?
For technical support, including AT27C020-12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT27C020-12TC requirements.
6.How does Aetrix verify that AT27C020-12TC is sourced from the original manufacturer or authorized distributors?
All AT27C020-12TC 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 AT27C020-12TC meets industry standards.
7.What is the process for return or replacement of AT27C020-12TC?
All AT27C020-12TC units undergo pre-shipment inspection (PSI). If there is an issue with AT27C020-12TC, 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 AT27C020-12TC part is unused and in its original packaging.
Return procedure for AT27C020-12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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