DS2433+ - 4Kb 1-Wire EEPROM TO-92-3 | Maxim Integrated
MPN: DS2433+ ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.08 | $3.08 |
| 10 | $2.87 | $28.70 |
| 100 | $2.45 | $245.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.92 | $1,920.00 |
DS2433+ Overview
What is a 1-Wire EEPROM? A 1-Wire EEPROM is a non-volatile memory device that communicates over a single data/power line using Maxim's proprietary 1-Wire protocol. Unlike I2C or SPI EEPROMs that require multiple signals, 1-Wire parts halve the wiring harness in identification, calibration, and consumable-tracking applications. Within the broader taxonomy, the DS2433+ sits under: EEPROM -> non-volatile memory -> memory IC -> integrated circuit -> semiconductor. Its single-pin parasitic-power architecture is the defining differentiator versus I2C EEPROMs (24Cxx family) and SPI EEPROMs (25Cxx family).
Key features include: 4 Kbit of user-programmable EEPROM, a 256-bit (32-byte) scratchpad for write-buffered transactions, page-write granularity of 32 bytes, ±5 ns overdrive data-rate support, 1-Wire protocol compatibility with the DS1990 family, and an ESD rating of ±4 kV Human Body Model. The on-board 64-bit ROM enables a single microcontroller GPIO to identify, read, and write multiple DS2433+ devices on a multidrop bus.
Technically, the DS2433+ uses a silicon-level serial number burned at wafer test for traceability. Its strict 1-Wire reset/presence/Read-ROM/Match-ROM/Skip-ROM command set follows the iButton standard, allowing the part to coexist with DS18B20 temperature sensors, DS2401 serial-number chips, and DS1990 ROMs on the same wire. Write cycles commit a full 32-byte page in approximately 10 ms.
Typical applications include PCB identification and asset tagging, consumable authentication (printer cartridges, medical disposables), board-level calibration data storage, iButton accessories, and standalone serial-number registration for FPGAs or microcontrollers lacking on-board unique IDs. The 3-pin TO-92 through-hole package makes it ideal for products that must be hand-inserted or panel-mounted with a mechanical lanyard, since the package doubles as an electrical contact point.
When designing with the DS2433+, reserve a 4.7 kΩ pull-up on the DQ line and add a 1N914 or equivalent ESD diode to GND for transient suppression in industrial environments. Use the part's CRC to validate read integrity and always issue a Skip ROM or Match ROM command before scratchpad writes to avoid address collisions.
This page synthesizes distributor pricing as of 2026-10-07, drop-in compatible alternatives (DS24B33+, DS2431, DS1971), and practical 1-Wire design notes not consolidated on the manufacturer's product page.
Drop-in alternatives for DS2433+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with DS2433+ (same form factor and footprint) — differing in Interface, Memory Size, Memory Type, Mounting Type, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
DS24B33+
✅ Drop-In✓ In Stock
$1.92 / Unit
View Datasheet →DS2431+
✅ Drop-In📋 Reference alternative (not in catalog)
DS1971+
✅ Drop-In📋 Reference alternative (not in catalog)
DS2433+T&R
✅ Drop-In📋 Reference alternative (not in catalog)
DS2433
✅ Drop-In📋 Reference alternative (not in catalog)
DS2433+ Maximum Ratings & Electrical Characteristics
| Memory Type | EEPROM (Non-Volatile) |
| Memory Size | 4 Kbit (512 bytes) |
| Organization | 16 pages × 256 bits (32 bytes/page) |
| Interface | 1-Wire (Maxim proprietary, single data/power line) |
| Family Code | 0x23 |
| Unique Serial Number | 48-bit factory-lasered |
| ROM Registration Length | 64 bits (8-bit CRC + 48-bit serial + 8-bit family) |
| Parasitic Power | Yes (power derived from 1-Wire line) |
| External Supply Required | No |
| Scratchpad Size | 32 bytes (256 bits) |
| Operating Temperature | -40°C to +85°C |
| Package | TO-92-3 (through-hole) |
| Mounting Type | Through Hole |
| Compatibility Family | DS1990 / DS18B20 / DS2401 / iButton |
| RoHS Status | Compliant |
DS2433+ Pin Configuration
| Pin 1 | GND — Ground reference for 1-Wire DQ line |
| Pin 2 | DQ — 1-Wire data line (open-drain, requires external pull-up) |
| Pin 3 | NC — Not connected (reserved per datasheet) |
Typical Applications
DS2433+ is suitable for 6 applications: PCB Identification and Serialization, Consumable Authentication and Anti-Counterfeit, Board-Level Calibration Data Storage, iButton Accessories and Token Identification, Standalone Unique ID for FPGAs and MCUs, Industrial Sensor Node Tagging.
PCB Identification and Serialization
The DS2433+ provides each PCB with a factory-unique 64-bit ROM that includes a 48-bit serial number and 8-bit CRC, enabling traceability without programming. Engineers attach it to the board as a through-hole part in the TO-92-3 package, wire DQ to a spare GPIO, and use 1-Wire Skip ROM commands to read the ID at boot. With 4 Kbit of EEPROM (16 pages of 32 bytes), the DS2433+ additionally stores board-revision, firmware version, or calibration constants read by firmware during initialization. Its parasitic power design means zero standby current drain from the host, ideal for battery-backed or energy-harvesting systems.
Recommended
Consumable Authentication and Anti-Counterfeit
The DS2433+ authenticates printer cartridges, medical disposables, and industrial consumables by storing a secret token in its 32-byte scratchpad pages. The host microcontroller writes a unique challenge to the scratchpad, reads back a CRC-validated response, and verifies authenticity before enabling the consumable. The factory-lasered 64-bit serial number prevents cloning because each chip has a unique ID burned at wafer test. The DS2433+'s 1-Wire interface needs only one GPIO on the host, simplifying the mechanical design of cartridges that must mate with the printer via a single contact pad.
Recommended
Board-Level Calibration Data Storage
Test-and-measurement instruments store per-unit calibration coefficients in the DS2433+'s 4 Kbit EEPROM, eliminating manual trimming potentiometers. The host firmware reads factory-programmed values from the scratchpad, applies them in real time, and writes updated coefficients back to a free page when the instrument is recalibrated. With 16 pages of 32 bytes each, the DS2433+ supports multiple calibration profiles (e.g., high-gain / low-gain / temperature-compensated) in a single chip. The 1-Wire interface means calibration can be performed via a single test-point pad instead of a programming header.
Recommended
iButton Accessories and Token Identification
The DS2433+ in TO-92-3 package slots directly into iButton readers as a read/write memory token, complementing the DS1990 (serial-only) and DS1961 (1 Kbit) families. Operators can carry a personal DS2433+ as a key-fob, badge, or asset tag containing 512 bytes of access logs, duty rosters, or maintenance records. Because the part is protocol-compatible with the broader 1-Wire/iButton ecosystem, the same reader hardware reads DS2433+ tokens alongside DS18B20 temperature pills and DS1971 serial buttons. The through-hole TO-92 package can also be panel-mounted in a lanyard-format plastic enclosure.
Recommended
Standalone Unique ID for FPGAs and MCUs
Many low-cost microcontrollers and FPGAs lack on-chip unique IDs, so designers attach a DS2433+ to provide a guaranteed-distinct 48-bit serial number for network addressing, license-binding, or device commissioning. The DS2433+ occupies one GPIO pin and zero standby current, sitting in parallel with the MCU's main flash and not interfering with boot ROMs. The 4 Kbit EEPROM additionally stores bootstrap configuration, default network keys, or per-device secrets that the MCU loads on first boot. The 1-Wire protocol allows multiple DS2433+ chips on the same bus for redundant identification.
Recommended
Industrial Sensor Node Tagging
Industrial sensor nodes use the DS2433+ to tag each sensor with installation date, calibration history, and operator notes stored in its 4 Kbit EEPROM. A maintenance technician scans the 1-Wire bus from a handheld reader and reads the 512 bytes of metadata without powering up the sensor node, dramatically speeding field audits. The DS2433+'s -40°C to +85°C operating temperature range tolerates outdoor cabinets and factory floors. Its parasitic power design means the metadata is always available even when the sensor node is unpowered or in fault.
Recommended
Recommended Products Summary
Engineering reference data for DS2433+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | DS24B33+ | DS2431+ | DS1971+ | DS2433+T&R | DS2433 |
|---|---|---|---|---|---|---|
| Package | TO-92-3 | TO-92-3 (same) | TO-92-3 (same) | TO-92-3 (same) | TO-92-3 (same) | TO-92-3 (same) |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Memory Size | 4 Kbit (512 bytes) | 4 Kbit | 1 Kbit (-75%) | 256 bit (-94%) | 4 Kbit | 4 Kbit |
| Page Organization | 16 pages × 32 bytes | 16 pages × 32 bytes | 4 pages × 32 bytes | 1 page × 32 bytes | 16 pages × 32 bytes | 16 pages × 32 bytes |
| Interface | 1-Wire | 1-Wire | 1-Wire | 1-Wire | 1-Wire | 1-Wire |
| Family Code | 0x23 | 0x23 (same family) | 0x2D | 0x01 | 0x23 | 0x23 |
| Parasitic Power | Yes | Yes | Yes | Yes | Yes | Yes |
| RoHS Compliance | Yes ('+' suffix) | Yes | Yes | Yes | Yes | No (Pb finish) |
Key Differentiators
- Pin-compatible upgrade path to DS24B33+ (vs DS2431+)
- Higher density than DS1971+ for richer metadata (vs DS1971+)
- Drop-in newer-generation successor available (vs DS24B33+)
Design Notes
The DS2433+ derives all read and write power parasitically from the DQ line, so a 4.7 kΩ pull-up to VPU (3.0–5.25 V) is mandatory. For long cables (>5 m) or multi-drop buses with many devices, lower the pull-up to 2.2 kΩ to maintain rise-time margin. Add a 100 nF decoupling capacitor close to the host MCU's VPU rail to absorb the inrush current during strong pull-up write cycles (when the host sources ≥10 mA to DQ during EEPROM commit).
When using a microcontroller GPIO to drive DQ, configure it as open-drain, never push-pull. A push-pull high would back-power the DS2433+ during MCU reset and corrupt EEPROM writes. Issue a 1-Wire reset plus presence pulse before every transaction, and always read the DS2433+'s 8-bit CRC to validate packet integrity — Maxim's CRC-8 polynomial is X8 + X5 + X4 + 1 (same as DS18B20).
Place a 1N914 (or equivalent) bidirectional ESD diode from DQ to GND as close to the DS2433+ TO-92 lead as possible when the part is exposed to user handling or cable transients. The TO-92 package has no on-board ESD protection beyond the silicon, and external handling (iButton-style probing) can inject >±4 kV. For multi-drop buses, keep stubs to DQ shorter than 1/10th of the main cable length to suppress reflections.
Estimated: the 1-Wire reset pulse must be held low by the master for at least 480 µs at standard speed; the DS2433+ responds with a 60–240 µs presence pulse. With a 4.7 kΩ pull-up and 50 pF of bus capacitance, rise time is roughly 1.1 µs — well within the 15 µs maximum. For overdrive mode, divide all timing parameters by 8 and use a 2.2 kΩ pull-up; overdrive is supported up to 142 kbps.
Compliance Information
RoHS and REACH compliance confirmed by Maxim Integrated product declaration. The '+' suffix indicates lead-free, halogen-free packaging per JEDEC J-STD-609. AEC-Q100 is not applicable (industrial-grade EEPROM). Conflict-minerals declaration available via franchised distributor.
