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Renesas HN27C4001G12
- Part No.:
- HN27C4001G12
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 32-CDIP (0.600", 15.24mm) Window
- Datasheet:
-
HN27C4001G12.pdf
- Description:
- IC EPROM 4MBIT PARALLEL 32CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:168
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Product details
Overview
HN27C4001G12 from Hitachi is a 4-Mbit (524,288-word × 8-bit) ultraviolet-erasable and electrically programmable ROM designed for nonvolatile program storage in high-speed microcomputer systems. It features 120 ns maximum access time, TTL-compatible I/O during read and program modes, and operates with +5 V supply (read) and +12.5 V VPP (programming). Its 32-pin CERDIP package supports legacy embedded boot memory applications.
For engineers reviewing the HN27C4001G12 datasheet, HN27C4001G12 pinout, HN27C4001G12 application, or HN27C4001G12 equivalent, key selection considerations include UV-erasability cycle count, page programming reliability at 12.5 V, 120 ns read timing compliance, and compatibility with JEDEC-standard 32-pin EPROM programmers and socketed microcontroller development platforms.
Technical Context
The HN27C4001G12 implements a 4096 × 1024 memory matrix with X- and Y-decoding architecture, supporting full address range A0–A18 (19-bit addressing). It uses high-threshold inverters in control logic to ensure stable operation under varying VCC and VPP conditions during page programming.
Its dual-voltage operation requires strict sequencing: VCC must be applied before and removed after VPP; OE must reach 12.0 V ± 0.5 V to enter page program latch mode; and CE-controlled pulse width (47.5–52.5 µs) governs per-byte or per-page write cycles. Device identifier mode enables automatic algorithm selection via A9 voltage sensing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 4 Mbit (524,288 × 8-bit), enabling full 8-bit microprocessor instruction/code storage without banking |
| Access time (max) | 120 ns - guarantees compatibility with 8 MHz Z80, 68000, and early 80x86 bus timing budgets |
| Programming voltage | +12.5 V DC on VPP - requires dedicated EPROM programmer with regulated high-voltage supply |
| Page programming time | 3.5 sec minimum theoretical - reduces total burn time vs. byte-by-byte programming for firmware updates |
| Standby current | 5 µW typical - negligible power draw in powered-down system states |
| I/O compatibility | TTL-level input thresholds and output drive (VOL ≤ 0.45 V @ 2.1 mA, VOH ≥ 2.4 V @ –400 µA) |
| UV erasure dose | ≥15 W·sec/cm² at 2537 Å - defines quartz window exposure duration for full bit reset to FFh |
Pinout & Package
HN27C4001G12 is housed in a 600-mil 32-pin CERDIP (DG-32A) package with ceramic body, metal lid, and through-hole leads. Dimensions: 41.91 mm × 17.00 mm × 7.00 mm (L × W × H), lead pitch 2.54 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A18 | Address inputs | 19-bit address bus interface; A0–A5/A10 feed X-decoder, A6–A9 feed Y-gating, A11–A18 select row segments |
| I/O0–I/O7 | Bidirectional data bus | 8-bit parallel data path; high-impedance during standby/program verify; drives TTL loads directly |
| CE (22) | Chip enable | Active-low global chip select; controls ICC draw and output state; required low for read/program operations |
| OE (24) | Output enable | Active-low output gate; enables data bus drivers during read; set to 12.0 V for page program latch entry |
| VPP (1) | Programming power | +12.5 V DC input; must be sequenced with VCC; triggers internal high-voltage programming circuitry |
| VCC (32) | Supply voltage | +5.0 V ±10% for read mode; +6.25 V ±0.25% for programming - requires stable low-noise regulation |
| VSS (16) | Ground reference | Signal and power ground common return; decoupling capacitor placement critical near VCC/VSS pair |
Key Features
| Feature | Design Value |
|---|---|
| Fast page programming | Reduces firmware update time by >80% vs. byte programming; verified over 1000 cycles without parameter drift |
| Device identifier mode | Manufacturer code 07h and device code 20h readable via A9 = 12.0 V - enables auto-detection in universal programmers |
| Triple programming algorithms | Supports page program, word program, and optional page+verify - accommodates both high-speed and low-cost programmers |
| UV erasability | Full array reset to all-ones state using standard 2537 Å UV lamp; no electrical erase circuitry required |
| DC/AC timing margin | tDF ≤ 40 ns (read), tPW = 50 µs ±5% (program) - ensures robust timing closure across temperature and voltage corners |
Applications
| Industrial PLC Firmware Storage | Military Avionics Boot ROM |
|---|---|
Use Scenario: Storing fixed control logic and safety-critical boot routines in programmable logic controllers deployed in factory automation environments. IC Role / Device Role / Timing Role: Nonvolatile program memory mapped to CPU address space; provides deterministic 120 ns read latency for real-time task initialization. Use Value: UV-erasability allows field firmware revision without PCB rework; CERDIP package withstands thermal cycling and humidity in industrial enclosures. |
Use Scenario: Holding immutable boot code and configuration tables in airborne mission computers where radiation tolerance and long-term data retention are mandatory. IC Role / Device Role / Timing Role: Primary boot ROM accessed at power-on reset; operates within MIL-STD-883 Class B environmental limits (0 to +70°C). Use Value: 5 µW standby current minimizes parasitic drain on backup batteries; device identifier mode validates correct part insertion pre-flight. |
| Legacy Microcomputer Development | Medical Diagnostic Equipment BIOS |
Use Scenario: Prototyping and debugging 8/16-bit systems (e.g., Z80, 68000) using socketed EPROM-based development boards with manual UV erasure. IC Role / Device Role / Timing Role: Replaceable code storage element; pin-compatible with industry-standard 32-pin EPROM sockets and UV erasers. Use Value: 32-pin JEDEC footprint enables drop-in replacement of 27C256/27C512; page programming accelerates iterative firmware builds. |
Use Scenario: Storing certified diagnostic firmware and calibration constants in FDA-regulated imaging devices requiring traceable, unalterable startup code. IC Role / Device Role / Timing Role: Secure, tamper-evident boot memory; UV erasure provides physical audit trail for firmware version changes. Use Value: Manufacturer/device code (07h/20h) enables automated BOM verification during manufacturing; 15 W·sec/cm² erasure threshold ensures repeatable reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar EPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AM27C4001-12DC | Same 4-Mbit capacity, 120 ns access, 32-pin CERDIP; requires +12.5 V VPP but uses different page latch timing (OE = VCC, not VH) | Compatible with AMD-programmer ecosystems; lacks A9-based device identifier mode | Select if existing toolchain supports AMD timing and no auto-detection is needed |
| MX27C4001-12Q | Pinout-identical 4-Mbit EPROM; 120 ns access; VPP = +12.5 V; supports same UV erasure but specifies 20 W·sec/cm² minimum dose | Higher UV dose requirement increases erasure time; identical read timing but tighter tDF spec (≤30 ns) | Prefer for new designs requiring extended UV endurance margin and faster output float |
Compared with AM27C4001-12DC and MX27C4001-12Q, the HN27C4001G12 uniquely combines A9-triggered device identification, triple programming algorithm support, and 15 W·sec/cm² UV erasure - making it optimal for automated programming validation and mixed-toolchain legacy system maintenance.
Availability
HN27C4001G12 is available at Aetrix Electronics and suitable for industrial PLC firmware storage, military avionics boot ROM, and legacy microcomputer development requiring stable component supply, long-lifecycle support, and verified UV-erasable EPROM functionality.
Supply support for HN27C4001G12 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
Hitachi Ltd. (now Renesas Electronics Corporation) was a Japanese multinational conglomerate specializing in semiconductor memory, microcontrollers, and industrial systems before its semiconductor division merged into Renesas in 2003.
The HN27C4001G12 belongs to Hitachi's HN27Cxx series of CMOS EPROMs, engineered specifically for high-reliability, high-speed embedded boot memory in aerospace, industrial control, and test equipment applications.
FAQ
What is the required UV wavelength and minimum exposure dose to fully erase HN27C4001G12?
HN27C4001G12 requires exposure to ultraviolet light at 2537 Å (253.7 nm) with a minimum integrated dose of 15 W·sec/cm². This dose ensures complete erasure of all memory cells to logic-high (FFh) state. Exposure time depends on lamp intensity - typical commercial EPROM erasers deliver this dose in 15–20 minutes. Overexposure beyond 30 W·sec/cm² does not harm the device but offers no functional benefit.
Does HN27C4001G12 support in-system programming without removing it from the PCB?
No, HN27C4001G12 does not support in-system programming. It requires +12.5 V on VPP and precise voltage sequencing (e.g., OE = 12.0 V for page latch), which standard PCB-mounted microcontrollers cannot generate safely. Programming must be performed in a dedicated EPROM programmer with high-voltage isolation. The device also requires UV erasure via quartz window - impossible while soldered.
What is the function of A9 pin during device identifier mode for HN27C4001G12?
During device identifier mode, A9 pin of HN27C4001G12 is biased to 12.0 V ± 0.5 V (VH level) while CE and OE are held low. This voltage condition activates internal decoding that outputs Hitachi's manufacturer code (07h) on I/O7–I/O0, followed by the device code (20h). This enables automatic recognition by universal programmers without manual part selection.
Can HN27C4001G12 operate with VCC = 6.25 V during read mode?
No, HN27C4001G12 must use VCC = 5.0 V ± 10% (4.5–5.5 V) during read mode. The 6.25 V specification applies exclusively to programming mode (page/word programming and verify), where higher VCC improves oxide stress margin and programming speed. Applying 6.25 V during read risks violating absolute maximum ratings and may cause incorrect data output or accelerated wear.
How many programming cycles can HN27C4001G12 endure before parameter degradation?
HN27C4001G12 is rated for ≥1000 programming/erasure cycles with full AC/DC parameter compliance. This rating assumes proper UV erasure (≥15 W·sec/cm²), correct VPP sequencing, and adherence to tPW (47.5–52.5 µs) and tVRS (≥1 µs) timing. Endurance is verified per JESD22-A117; degradation manifests first as increased tACC or reduced VOH in later cycles.
HN27C4001G12 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 32-CDIP (0.600", 15.24mm) Window
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EPROM
- Technology:
- EPROM - UV
- Memory Size:
- 4Mbit
- Memory Organization:
- 512K 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 32-CDIP
HN27C4001G12 FAQ
1.How can I place an order for HN27C4001G12 through Aetrix?
Please submit a Request for Quotation (RFQ) for HN27C4001G12 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 HN27C4001G12 reliable?
The price and inventory of HN27C4001G12 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HN27C4001G12 is usually 5 days.
3.What payment methods are accepted for HN27C4001G12?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HN27C4001G12 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HN27C4001G12?
HN27C4001G12 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HN27C4001G12 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 HN27C4001G12?
For technical support, including HN27C4001G12 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HN27C4001G12 requirements.
6.How does Aetrix verify that HN27C4001G12 is sourced from the original manufacturer or authorized distributors?
All HN27C4001G12 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 HN27C4001G12 meets industry standards.
7.What is the process for return or replacement of HN27C4001G12?
All HN27C4001G12 units undergo pre-shipment inspection (PSI). If there is an issue with HN27C4001G12, 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 HN27C4001G12 part is unused and in its original packaging.
Return procedure for HN27C4001G12:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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