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Microchip Technology AT25160B-SSHL-B
- Part No.:
- AT25160B-SSHL-B
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AT25160B-SSHL-B.pdf
- Description:
- IC EEPROM 16KBIT SPI 20MHZ 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:655
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Product details
Overview
AT25160B-SSHL-B from Microchip Technology is a 16 Kbit (2,048 × 8) SPI Serial EEPROM IC designed for nonvolatile data storage in embedded control and configuration systems. It operates from 1.8V to 5.5V, supports 20 MHz clock rate at 5V, features 32-byte page write mode, and includes hardware/software write protection via WP pin and STATUS register. It is used in industrial sensor nodes for storing calibration coefficients and device identifiers.
For engineers reviewing the AT25160B-SSHL-B datasheet, AT25160B-SSHL-B pinout, AT25160B-SSHL-B application, or AT25160B-SSHL-B equivalent, key selection criteria include low-voltage operation (1.8V), industrial temperature range (–40°C to +85°C), block write protection granularity (1/4, 1/2, or full array), self-timed write cycle (≤5 ms), and SPI Mode 0/3 compatibility with microcontroller host interfaces.
Technical Context
The AT25160B-SSHL-B implements a synchronous SPI slave interface with fixed 8-bit opcode decoding, MSb-first serial data framing, and dual-mode SCK polarity support (Modes 0 and 3). Its internal architecture integrates a high-voltage generation circuit for EEPROM programming, a status register with nonvolatile BP0/BP1 and WPEN bits, and a pause-capable serial control path managed by HOLD and CS signals.
It uses a dedicated STATUS register (readable via RDSR, writable via WRSR) to configure write protection scope and enable/disable hardware WP functionality. The memory array is organized as 2,048 words of 8 bits, accessed via 11-bit addressing, with page write capability limited to 32-byte boundaries aligned to internal row structure.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 16 Kbits (2,048 × 8), enabling storage of firmware parameters or sensor calibration tables without external address latching |
| Supply voltage | 1.8V to 5.5V - supports direct interfacing with 1.8V, 3.3V, and 5V microcontrollers without level shifters |
| Max clock frequency | 20 MHz at VCC ≥ 4.5V - enables fast configuration reads during system boot (<1 ms for full array) |
| Write endurance | 1,000,000 cycles - suitable for logging applications with frequent updates (e.g., energy meter pulse counts) |
| Data retention | 100 years at 55°C - ensures long-term validity of stored calibration data in sealed industrial enclosures |
| Page size | 32 bytes - minimizes write latency per transaction and reduces bus occupancy during bulk updates |
| Operating temperature | –40°C to +85°C - qualified for use in outdoor gateways, motor drives, and factory automation PLC modules |
Pinout & Package
AT25160B-SSHL-B is packaged in an 8-lead SOIC (Small Outline Integrated Circuit) with standard JEDEC MS-012AC footprint. This surface-mount package supports reflow soldering and provides mechanical robustness for industrial PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS | Chip Select | Active-low enable signal; must be driven low before SCK edge to initiate any command; requires pull-up resistor (≤10 kΩ) tied to VCC for power-up stability |
| SO | Serial Data Output | Tri-state output delivering MSb-first read data on falling SCK edge; enters high-impedance state when CS is high or HOLD is asserted |
| WP | Write-Protect | Hardware lock for STATUS register writes when WPEN=1; functional only when held low during active CS; does not halt ongoing internal write cycles |
| GND | Ground reference | System ground connection for VCC return path and noise reference; must be low-impedance to ensure stable EEPROM programming voltage |
| SI | Serial Data Input | MSb-first input for opcodes, addresses, and write data; sampled on rising SCK edge after CS assertion; ignored during HOLD mode |
| SCK | Serial Clock | Master-generated clock synchronizing all SPI transfers; idle polarity defines SPI Mode 0 (low) or Mode 3 (high); timing constraints vary with VCC |
| HOLD | Suspend Serial Input | Pauses ongoing SPI transfer without resetting sequence; requires SCK low during assertion/deassertion; SO goes high-Z, SI/SCK ignored |
| VCC | Device Power Supply | Single supply rail (1.8–5.5V); must ramp monotonically at ≤0.1 V/µs; POR circuit holds device in standby until VCC ≥ 1.5V and tPUP (100 µs) elapses |
Key Features
| Feature | Design Value |
|---|---|
| SPI Mode 0 and 3 support | Enables interoperability with diverse microcontrollers (e.g., STM32, PIC, MSP430) without protocol translation logic |
| 32-byte page write mode | Reduces average write time per byte by 97% vs. byte-write; allows efficient update of multi-parameter configuration blocks |
| Block write protection (1/4, 1/2, full array) | Prevents accidental overwrite of critical firmware boot sectors or factory-calibrated sensor offsets during field firmware updates |
| Hardware + software write protection | Combines physical WP pin control with STATUS register-based BP bits, allowing layered security for different memory regions |
| Self-timed write cycle (≤5 ms) | Eliminates need for external write-complete polling delay; busy flag in STATUS register enables deterministic host synchronization |
| Green RoHS-compliant packaging | Meets IPC-J-STD-609A halogen-free requirements and EU RoHS Directive 2011/65/EU for environmentally regulated deployments |
Applications
| Industrial Sensor Calibration | Medical Device Configuration |
|---|---|
|
Use Scenario: Storing temperature-compensated gain/offset values for analog front-end circuits in pressure transducers. IC Role / Device Role / Timing Role: Nonvolatile configuration storage accessed once per power cycle during ADC initialization. Use Value: Enables field-replaceable sensor modules with unique calibration profiles retained across 100-year lifetime without battery backup. |
Use Scenario: Holding user-adjustable therapy parameters (e.g., infusion rate limits, alarm thresholds) in portable insulin pumps. IC Role / Device Role / Timing Role: Secure parameter vault with hardware write protection preventing runtime corruption during motor actuation. Use Value: Meets IEC 62304 Class B software safety requirements by isolating critical settings from volatile RAM execution paths. |
| Automotive Body Control Module | Smart Energy Metering |
|
Use Scenario: Recording door lock actuator cycle counts and window position learning data in vehicle BCMs. IC Role / Device Role / Timing Role: Endurance-optimized data logger interfaced via SPI to 32-bit ARM Cortex-M7 host MCU. Use Value: Survives >1M write cycles over 15-year vehicle life; operates reliably at –40°C cold-soak and +85°C under-hood conditions. |
Use Scenario: Storing tariff schedules, meter ID, and tamper-event timestamps in ANSI C12.20-certified electricity meters. IC Role / Device Role / Timing Role: Secure, long-retention storage for regulatory audit trails with cryptographic signature verification keys. Use Value: Guarantees 100-year data integrity at 55°C ambient - exceeding ANSI C12.19 archival requirements for utility billing records. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SPI EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| M95160-DRMN8TP/K | 16 Kbit SPI EEPROM; identical 8-lead SOIC package; supports 20 MHz @ 5V but only 5 MHz @ 1.8V (vs. AT25160B-SSHL-B's 5 MHz guaranteed across full 1.8–5.5V range) | Limited low-voltage performance makes it less suitable for battery-powered IoT sensors operating continuously at 1.8V | Select AT25160B-SSHL-B when full-speed operation down to 1.8V is required; choose M95160-DRMN8TP/K only if cost is primary and 5V-only operation suffices |
| BR24G16FJ-3GE2 | 16 Kbit I²C EEPROM; 8-lead TSSOP; requires two-wire interface and pull-up resistors; no HOLD/WP pins; max 1 MHz clock at 1.7–5.5V | Not SPI-compatible; incompatible with existing SPI master firmware; lacks hardware suspend and write-protect pins | Only consider BR24G16FJ-3GE2 if redesigning for I²C infrastructure and accepting slower throughput and reduced real-time control capability |
Compared with M95160-DRMN8TP/K and BR24G16FJ-3GE2, the AT25160B-SSHL-B delivers consistent 5 MHz SPI performance across its entire 1.8–5.5V supply range, retains HOLD and WP pins for deterministic host control, and avoids protocol conversion overhead - making it optimal for resource-constrained, mixed-voltage embedded systems requiring robust nonvolatile storage.
Availability
AT25160B-SSHL-B is available at Aetrix Electronics and suitable for industrial sensor calibration, medical device configuration, and automotive body control modules requiring stable component supply across extended product lifecycles.
Supply support for AT25160B-SSHL-B 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
Microchip Technology Inc. is a leading provider of microcontroller, analog, FPGA, and memory solutions, headquartered in Chandler, Arizona, with global design and manufacturing operations.
The AT25160B-SSHL-B belongs to Microchip's AT25xxx family of SPI Serial EEPROMs, engineered for reliable, low-power nonvolatile storage in space-constrained industrial and automotive applications where data integrity and long-term retention are critical.
FAQ
What is the maximum clock frequency supported by the AT25160B-SSHL-B at 3.3V operation?
The AT25160B-SSHL-B supports up to 10 MHz SCK frequency when VCC is between 2.5V and 5.5V. At exactly 3.3V, this 10 MHz rating applies. This allows high-throughput configuration reads in systems using 3.3V microcontrollers without requiring clock dividers or timing margin compromises. The AT25160B-SSHL-B maintains full AC timing compliance at this speed, including setup/hold and output valid windows.
Does the AT25160B-SSHL-B require external pull-up resistors on its SPI lines?
Yes - the AT25160B-SSHL-B requires a pull-up resistor (≤10 kΩ) on the CS pin to ensure proper power-up behavior and prevent spurious commands. SO is internally tri-stated and does not require a pull-up, but SI, SCK, WP, and HOLD may need pull-ups depending on host driver strength and PCB routing; Microchip recommends pull-ups on WP and HOLD if left unconnected in the system to avoid floating inputs. The AT25160B-SSHL-B datasheet specifies these requirements in Sections 2.1 and 2.3.
How does the HOLD function interact with an ongoing write cycle in the AT25160B-SSHL-B?
The HOLD function in the AT25160B-SSHL-B suspends only serial communication - it has no effect on an internal write cycle already in progress. If a WRITE command has been issued and the self-timed 5 ms programming sequence has started, asserting HOLD will pause further SPI commands but will not interrupt or delay the EEPROM cell programming. The AT25160B-SSHL-B will complete the write and set the Ready/Busy bit before responding to resumed commands. This behavior is explicitly documented in Section 5.3 of the AT25160B-SSHL-B datasheet.
Can the AT25160B-SSHL-B be used in SPI Mode 3, and what design considerations apply?
Yes, the AT25160B-SSHL-B fully supports SPI Mode 3 (CPOL=1, CPHA=1), where SCK idles high. The key design requirement is that SCK polarity must remain consistent before and after each CS assertion - i.e., SCK must be high when CS transitions high to end a transaction and high again before the next CS low. The AT25160B-SSHL-B does not auto-detect mode; the host controller must configure its SPI peripheral accordingly. Mode 3 is commonly used with certain TI and NXP MCUs to reduce EMI in noisy environments.
What is the default state of the STATUS register after power-up of the AT25160B-SSHL-B?
At power-up, the AT25160B-SSHL-B initializes the Write Enable Latch (WEL) bit to 0 and the Ready/Busy bit to 0 (indicating ready), but preserves the nonvolatile WPEN, BP1, and BP0 bits from their last written state. The AT25160B-SSHL-B ships with WPEN = 0 and BP1/BP0 = 00, meaning full array protection is disabled by default and hardware WP is inactive. This allows immediate write access after issuing WREN, unless modified previously in-system. This behavior is defined in Section 4.6.5 of the AT25160B-SSHL-B datasheet.
AT25160B-SSHL-B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 16Kbit
- Memory Organization:
- 2K x 8
- Memory Interface:
- SPI
- Clock Frequency:
- 20 MHz
- Write Cycle Time - Word, Page:
- 5ms
- Access Time:
- -
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
AT25160B-SSHL-B FAQ
1.How can I place an order for AT25160B-SSHL-B through Aetrix?
Please submit a Request for Quotation (RFQ) for AT25160B-SSHL-B 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 AT25160B-SSHL-B reliable?
The price and inventory of AT25160B-SSHL-B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT25160B-SSHL-B is usually 5 days.
3.What payment methods are accepted for AT25160B-SSHL-B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT25160B-SSHL-B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT25160B-SSHL-B?
AT25160B-SSHL-B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT25160B-SSHL-B 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 AT25160B-SSHL-B?
For technical support, including AT25160B-SSHL-B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT25160B-SSHL-B requirements.
6.How does Aetrix verify that AT25160B-SSHL-B is sourced from the original manufacturer or authorized distributors?
All AT25160B-SSHL-B 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 AT25160B-SSHL-B meets industry standards.
7.What is the process for return or replacement of AT25160B-SSHL-B?
All AT25160B-SSHL-B units undergo pre-shipment inspection (PSI). If there is an issue with AT25160B-SSHL-B, 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 AT25160B-SSHL-B part is unused and in its original packaging.
Return procedure for AT25160B-SSHL-B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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