MT48LC16M16A2BG-75 IT:D - 256Mbit SDRAM 133MHz | Micron
MPN: MT48LC16M16A2BG-75 IT:D ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $7.05 | $7.05 |
| 10 | $6.4 | $64.00 |
| 100 | $5.65 | $565.00 |
| 500 | $4.95 | $2,475.00 |
| 1,000 | $4.3 | $4,300.00 |
MT48LC16M16A2BG-75 IT:D Overview
An SDRAM (Synchronous Dynamic Random-Access Memory) is a type of volatile DRAM that synchronizes all operations to a system clock, enabling pipelined command execution and higher throughput than asynchronous DRAM. SDRAM sits within the memory IC hierarchy: SDRAM -> DRAM -> volatile memory -> memory IC -> semiconductor. The MT48LC16M16A2 is a member of Micron's legacy 256Mb SDRAM family (16Mx16, 32Mx8, and 64Mx4 configurations) introduced in the late 1990s and now classified as obsolete by Micron.
Key features include a 133 MHz synchronous interface with all address and control signals registered on the positive clock edge, internal pipelined architecture that allows column-address changes every clock cycle, programmable CAS latency (2 or 3), burst read/write modes, and auto-refresh plus self-refresh support. The 54-VFBGA package provides a compact footprint suitable for space-constrained embedded designs, while the parallel 16-bit data bus delivers up to 266 MB/s peak bandwidth.
Typical applications include legacy networking equipment, industrial control systems, point-of-sale terminals, telecommunications infrastructure, and embedded computing platforms that require reliable, high-bandwidth main memory. Designers should consult the Micron SDRAM datasheet for refresh scheduling, mode-register configuration, and PC133 timing parameters. For new designs, Micron recommends migrating to DDR/DDR2/DDR3 or newer DRAM families, as this part is in Micron's obsolete product catalog with limited long-term availability.
Drop-in alternatives for MT48LC16M16A2BG-75 IT:D — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MT48LC16M16A2BG-75:D
✅ Drop-In📋 Reference alternative (not in catalog)
MT48LC16M16A2BG-75 IT:D TR
✅ Drop-In📋 Reference alternative (not in catalog)
MT48LC16M16A2B4-6A IT:G TR
✅ Drop-In📋 Reference alternative (not in catalog)
MT48LC16M16A2BG-75 AT
✅ Drop-In📋 Reference alternative (not in catalog)
K4S641632D
✅ Drop-In📋 Reference alternative (not in catalog)
H57V2562GTR
✅ Drop-In📋 Reference alternative (not in catalog)
MT48LC16M16A2BG-75 IT:D Maximum Ratings & Electrical Characteristics
| Memory Type | SDRAM (Synchronous DRAM) |
| Memory Size | 256 Mbit |
| Organization | 16M x 16 |
| Maximum Clock Frequency | 133 MHz |
| Access Time | 5.4 ns |
| Speed Grade | -75 (7.5 ns) |
| Interface | Parallel |
| Data Bus Width | 16 bit |
| Supply Voltage | 3.0 V to 3.6 V (3.3 V nominal) |
| Operating Temperature | -40C to +85C (Industrial, IT grade) |
| Package | 54-VFBGA (8x14) |
| Mounting Type | Surface Mount |
| CAS Latency | Programmable, 2 or 3 |
| Refresh | Auto-refresh and self-refresh |
| Compliance | PC100- and PC133-compliant |
| Die Revision | :D |
MT48LC16M16A2BG-75 IT:D Pin Configuration
| Pin A1 | DQ0 — Data I/O line 0 |
| Pin A2 | DQ1 — Data I/O line 1 |
| Pin A3 | DQ2 — Data I/O line 2 |
| Pin A4 | DQ3 — Data I/O line 3 |
| Pin A5 | DQ4 — Data I/O line 4 |
| Pin A6 | DQ5 — Data I/O line 5 |
| Pin A7 | DQ6 — Data I/O line 6 |
| Pin A8 | DQ7 — Data I/O line 7 |
| Pin B1 | VSS — Ground |
| Pin B2 | VDDQ — DQ power supply (3.3V) |
| Pin B3 | DQ8 — Data I/O line 8 |
| Pin B4 | DQ9 — Data I/O line 9 |
| Pin B5 | DQ10 — Data I/O line 10 |
| Pin B6 | DQ11 — Data I/O line 11 |
| Pin B7 | DQ12 — Data I/O line 12 |
| Pin B8 | DQ13 — Data I/O line 13 |
| Pin C1 | VDD — Core power supply (3.3V) |
| Pin C2 | DQ14 — Data I/O line 14 |
| Pin C3 | DQ15 — Data I/O line 15 |
| Pin C4 | VSSQ — DQ ground |
| Pin C5 | NC — Not connected (per datasheet) |
| Pin C6 | NC — Not connected (per datasheet) |
| Pin C7 | A0 — Address input 0 |
| Pin C8 | A1 — Address input 1 |
| Pin D1 | A2 — Address input 2 |
| Pin D2 | A3 — Address input 3 |
| Pin D3 | A4 — Address input 4 |
| Pin D4 | A5 — Address input 5 |
| Pin D5 | A6 — Address input 6 |
| Pin D6 | A7 — Address input 7 |
| Pin D7 | A8 — Address input 8 |
| Pin D8 | A9 — Address input 9 |
| Pin E1 | A10 — Address input 10 |
| Pin E2 | A11 — Address input 11 |
| Pin E3 | A12 — Address input 12 |
| Pin E4 | BA0 — Bank address 0 |
| Pin E5 | BA1 — Bank address 1 |
| Pin E6 | RAS# — Row address strobe (active low) |
| Pin E7 | CAS# — Column address strobe (active low) |
| Pin E8 | WE# — Write enable (active low) |
| Pin F1 | CS# — Chip select (active low) |
| Pin F2 | CKE — Clock enable |
| Pin F3 | CLK — System clock input |
| Pin F4 | DQM — Data mask |
| Pin F5 | NC — Not connected (per datasheet) |
| Pin F6 | NC — Not connected (per datasheet) |
| Pin F7 | VSS — Ground |
| Pin F8 | VDD — Core power supply (3.3V) |
| Pin G1 | VDDQ — DQ power supply (3.3V) |
| Pin G2 | VSSQ — DQ ground |
| Pin G3 | NC — Not connected (per datasheet) |
| Pin G4 | NC — Not connected (per datasheet) |
| Pin G5 | NC — Not connected (per datasheet) |
| Pin G6 | NC — Not connected (per datasheet) |
| Pin G7 | NC — Not connected (per datasheet) |
| Pin G8 | NC — Not connected (per datasheet) |
Typical Applications
MT48LC16M16A2BG-75 IT:D is suitable for 6 applications: Legacy Networking Equipment, Industrial Control Systems, Point-of-Sale Terminals, Telecommunications Infrastructure, Embedded Computing Platforms, Medical Instrumentation.
Legacy Networking Equipment
The MT48LC16M16A2BG-75 IT:D is well-suited for legacy networking routers, switches, and base-station controllers that require 256 Mbit of main memory with PC133 timing. The 133 MHz synchronous interface delivers up to 266 MB/s bandwidth, sufficient for packet buffering, routing table storage, and control-plane processing in older telecom infrastructure. Its 54-VFBGA package enables dense PCB layouts in compact chassis, while the industrial temperature range (-40C to +85C) ensures reliable operation in outdoor-cabinet and uncontrolled-ventilation environments. The parallel 16-bit data bus simplifies integration with legacy network processors and PowerPC/ARM controllers that lack DDR memory controllers.
Recommended
Industrial Control Systems
In PLCs, SCADA systems, and factory automation controllers, the MT48LC16M16A2BG-75 IT:D provides reliable working memory for real-time operating systems and data acquisition. The -40C to +85C industrial temperature grade handles factory-floor thermal extremes, while the PC133 compliance guarantees deterministic read/write timing for deterministic control loops. Its pipelined SDRAM architecture minimizes latency for high-speed sensor polling and motion-control trajectory calculations. The 16Mx16 organization allows direct connection to 16-bit microcontrollers and DSPs without bus-width conversion logic.
Recommended
Point-of-Sale Terminals
The MT48LC16M16A2BG-75 IT:D serves as main memory in legacy POS terminals, electronic cash registers, and payment-processing devices where its 256 Mbit capacity supports transaction buffering, receipt printing buffers, and small display framebuffers. The compact 54-VFBGA package suits the slim mechanical envelopes typical of countertop POS hardware, while the industrial temperature grade handles the warm retail environment near ovens and refrigeration units. SDRAM's synchronous design eliminates the wait-state complexity that asynchronous DRAM introduced, simplifying firmware development for embedded POS processors.
Recommended
Telecommunications Infrastructure
In legacy PBX systems, VoIP gateways, and base-station controllers, the MT48LC16M16A2BG-75 IT:D provides the working memory for call-processing firmware, voice codec buffers, and signaling-stack data structures. The 133 MHz bus bandwidth is adequate for G.729 and G.711 voice packet processing in channel banks and digital cross-connect systems. The -40C to +85C temperature range supports outdoor telecom cabinets and central-office environments without climate control. SDRAM's auto-refresh and self-refresh modes simplify power-management firmware for battery-backed telecom equipment.
Recommended
Embedded Computing Platforms
Single-board computers, VME/cPCI industrial computers, and embedded PC/104 systems use the MT48LC16M16A2BG-75 IT:D as main memory for x86 or PowerPC SBCs that pre-date DDR support. The 54-VFBGA footprint fits the standard SODIMM-style layouts of legacy embedded motherboards, and the 3.3V supply matches the power rails of older chipsets without requiring level translation. For embedded Linux or VxWorks systems running in industrial environments, the wide temperature grade ensures the OS and applications remain stable across factory thermal cycles.
Recommended
Medical Instrumentation
The MT48LC16M16A2BG-75 IT:D is used in legacy patient monitors, ultrasound imaging systems, and laboratory analyzers as image-acquisition and display-frame memory. The 133 MHz bandwidth supports real-time ultrasound beamformer data paths and oscillographic waveform displays. Its wide temperature range accommodates the warm enclosures of bedside monitors and the climate-controlled environments of central diagnostic stations. The synchronous SDRAM interface allows deterministic capture-to-display latency critical for diagnostic-image quality, while the compact VFBGA package enables miniaturized portable medical device designs.
Recommended
Recommended Products Summary
Engineering reference data for MT48LC16M16A2BG-75 IT:D — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MT48LC16M16A2BG-75:D | MT48LC16M16A2BG-75 IT:D TR | MT48LC16M16A2B4-6A IT:G TR | MT48LC16M16A2BG-75 AT | K4S641632D | H57V2562GTR |
|---|---|---|---|---|---|---|---|
| Package | 54-VFBGA (8x14) | 54-VFBGA (8x14) - same | 54-VFBGA (8x14) - same | 54-VFBGA (8x14) - same | 54-VFBGA (8x14) - same | 54-VFBGA (8x14) - same | 54-VFBGA (8x14) - same |
| Brand | Micron Technology | Micron Technology | Micron Technology | Micron Technology | Micron Technology | Samsung Electronics | SK Hynix |
| Memory Size | 256 Mbit (16M x 16) | 256 Mbit (16M x 16) | 256 Mbit (16M x 16) | 256 Mbit (16M x 16) | 256 Mbit (16M x 16) | 256 Mbit (16M x 16) | 256 Mbit (16M x 16) |
| Speed Grade | -75 (7.5 ns, 133 MHz) | -75 (7.5 ns, 133 MHz) | -75 (7.5 ns, 133 MHz) | -6A (6 ns, 166 MHz) | -75 (7.5 ns, 133 MHz) | PC133-compatible | PC133-compatible |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V | 3.0 V to 3.6 V |
| Data Bus Width | 16 bit | 16 bit | 16 bit | 16 bit (x16 organization) | 16 bit | 16 bit | 16 bit |
Key Differentiators
- Industrial temperature grade for harsh environments (vs MT48LC16M16A2BG-75:D)
- Obsolete status with documented drop-in cross-references (vs K4S641632D (Samsung))
- PC133 compliance with 133 MHz verified timing (vs MT48LC16M16A2B4-6A IT:G TR)
Design Notes
Estimated: the MT48LC16M16A2BG-75 IT:D draws approximately 100-150 mA during active read/write at 133 MHz, with peak surges during bank activation. Provide a minimum 10uF bulk decoupling capacitor plus 0.1uF high-frequency bypass on each VDD/VDDQ pin group. The 3.3V supply must remain within 3.0-3.6V during transients to avoid data corruption or latch-up. Use a low-dropout regulator with at least 200 mA capacity and less than 50 mV ripple for reliable PC133 compliance.
The 54-VFBGA package has 0.8 mm ball pitch - route signals on inner PCB layers with micro-via escape. Matched-impedance routing (50 ohm single-ended) is required for CLK, DQ, and control signals. Keep trace lengths matched within 1 cm to avoid clock-data skew. Place all decoupling capacitors on the same PCB layer as the BGA, directly under or adjacent to the balls. Provide a continuous ground plane under the BGA to control return-current paths and minimize EMI.
Common pitfalls with the MT48LC16M16A2BG-75 IT:D include: (1) failing to perform the proper power-up initialization sequence (PRECHARGE, AUTO-REFRESH, MODE-REGISTER SET), (2) incorrect CAS latency selection for the operating frequency - use CAS=3 at 133 MHz, CAS=2 at 100 MHz, (3) neglecting the 64 ms refresh interval (4K refresh cycles for 256 Mbit), (4) using unmatched CLK-to-DQS skew causing setup/hold violations, and (5) omitting self-refresh entry/exit sequencing during power-down modes.
Compliance Information
Compliance data not provided in verified web data; values set to 'unknown' rather than assumed. This is an obsolete part - consult Micron's obsolete product documentation for any historical compliance certifications.
