BAW100G BK PBFREE - Dual 75V 250mA Switching Diode | Central Semiconductor
MPN: BAW100G BK β End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.38 | $0.38 |
| 10 | $0.3 | $3.00 |
| 100 | $0.19 | $19.00 |
| 500 | $0.14 | $70.00 |
| 1,000 | $0.11 | $110.00 |
BAW100G BK Overview
A diode array is an integrated package containing two or more discrete switching diodes in a single molded body. Diode arrays belong to the broader family of small-signal switching diodes, which sit within the discrete semiconductor hierarchy alongside rectifiers, Zener diodes, and other general-purpose diodes. The BAW100G is the lead-free (PBFREE) variant of the original BAW100 series, designed specifically for high-speed switching where fast recovery and low leakage are critical.
Key features include electrically isolated dual-diode construction that eliminates crosstalk between channels, a 75 V reverse voltage rating suitable for 24 V industrial logic environments, a 250 mA (DC) forward current capability, and fast switching characteristics optimized for signal clamping, gating, and steering. The PBFREE suffix guarantees lead-free, RoHS-aligned construction for modern assembly processes.
The device's epoxy-molded SOT-143 package provides a compact footprint with four leads, enabling high-density placement on reflow-soldered PCBs. Each diode operates independently, allowing designers to use both channels in separate signal paths or configure them as a series pair or clamp network.
Typical applications include high-speed digital logic switching, signal clamping and protection in data lines, polarity steering in low-power circuits, and general-purpose rectification in consumer, industrial, and communications equipment.
Design consideration: the SOT-143 lead frame has an asymmetric larger lead; confirm orientation on the PCB footprint before reflow to avoid a rotated assembly.
This page consolidates verified distributor data, lifecycle status from the manufacturer product discontinuation notice PDN01220, drop-in alternatives, and practical design notes not found in the standard datasheet.
Drop-in alternatives for BAW100G BK β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
BAW100G TR
β Drop-Inπ Reference alternative (not in catalog)
BAW100 BK
β Drop-Inπ Reference alternative (not in catalog)
BAW100 TR
β Drop-Inπ Reference alternative (not in catalog)
BAW56WT1H
β Drop-Inπ Reference alternative (not in catalog)
BAW56E6_R1_00001
β Drop-Inπ Reference alternative (not in catalog)
BAW100G BK Maximum Ratings & Electrical Characteristics
| Diode Configuration | 2 Independent |
| Diode Type | High Speed Silicon Switching |
| Reverse Voltage (Vr) Max | 75 V |
| Average Forward Current | 250 mA (DC) |
| Package | SOT-143 (TO-253-4, TO-253AA) |
| Mounting Type | Surface Mount |
| Number of Pins | 4 |
| Number of Diodes | 2 |
| Isolation | Electrically isolated diodes |
| Lead Finish | Lead-free (PBFREE) |
| RoHS Status | Compliant (PBFREE) |
| Application | High speed switching |
| Case Style | Epoxy molded SOT-143 |
| Polarity | Standard (silicon) |
| Lifecycle Status | Discontinued per Central Semiconductor PDN01220 (Feb 9, 2023); BAW100G TR remains active |
| Packaging | Bulk (BK) |
BAW100G BK Pin Configuration
| Pin 1 | A1 β Diode 1 anode (per datasheet case outline - verify before routing) |
| Pin 2 | A2 β Diode 2 anode (per datasheet case outline - verify before routing) |
| Pin 3 | C1 β Diode 1 cathode (enlarged lead of SOT-143 case) |
| Pin 4 | C2 β Diode 2 cathode (per datasheet case outline - verify before routing) |
Typical Applications
BAW100G BK is suitable for 6 applications: High-Speed Logic Switching, Signal Clamping and Line Protection, Polarity Steering in Battery-Powered Devices, Relay and Inductive Kickback Suppression, Industrial Control and PLC I/O, RF and Communications Equipment Switching.
High-Speed Logic Switching
The BAW100G BK is expressly designed for high-speed switching applications, per the Central Semiconductor BAW100/BAW100G datasheet. Its two electrically isolated silicon switching diodes provide fast transition behavior suitable for discrete logic gating, diode-OR supply steering, and waveform shaping in digital boards. Each diode is independently accessible in the SOT-143 package, allowing two separate signal paths on one footprint and reducing board area versus two discrete SOD-123 diodes. With a 75 V reverse rating and 250 mA DC forward current, it handles typical 5 V and 24 V logic environments with wide margin. Place the diode close to the driven node to minimize stray inductance, which preserves the fast switching benefit at edge rates common in microcontroller and FPGA companion logic.
Recommended
Signal Clamping and Line Protection
In data-line and analog-input clamping, the BAW100G BK's two isolated diodes steer overvoltage transients to supply rails before they reach sensitive IC inputs. The 75 V DC reverse voltage rating gives roughly 3x headroom over 24 V industrial rails, and the 250 mA (DC) rating absorbs modest fault current while upstream series resistance limits energy. Because the diodes are electrically isolated within the epoxy-molded SOT-143 body, crosstalk between the two protected channels is minimized, important for precision ADC inputs and sensor front ends. Use a series resistor sized so fault current stays within the diode's rating, and verify clamping level equals the rail plus one forward diode drop. The PBFREE lead-free finish supports standard reflow assembly in RoHS-compliant industrial products.
Recommended
Polarity Steering in Battery-Powered Devices
Battery-powered consumer and IoT devices use dual diode arrays like the BAW100G BK for reverse-polarity protection and power-source ORing between battery and USB inputs. The independent dual-diode construction lets one SOT-143 package steer two supply inputs, saving placement cost versus two discrete diodes. The 75 V rating exceeds typical 12 V battery buses with margin, and 250 mA DC forward current covers low-power electronics in wearables, remote controls, and sensor nodes. Silicon diode forward drop of roughly 0.7 V must be budgeted in low-voltage systems; for ultra-low dropout, pair this array with a downstream LDO regulator to recover a clean regulated rail. The surface mount SOT-143 case suits automated high-volume pick-and-place assembly.
Recommended
Relay and Inductive Kickback Suppression
When driving small relays, solenoids, or fan loads from logic, the BAW100G BK functions as a freewheeling (flyback) diode to clamp inductive kickback. The 75 V reverse rating absorbs the negative voltage spike on a 12 V or 24 V coil, protecting the driving transistor from avalanche stress. The 250 mA DC rating covers signal relays and small reed relays within their coil-current envelope. Because the array contains two isolated diodes, one package can clamp two independent relay channels, common in home automation and HVAC control boards. Route the diode directly across the coil terminals with short traces to minimize the loop area where the flyback current circulates; this reduces EMI radiated during each relay release event.
Recommended
Industrial Control and PLC I/O
Factory automation I/O cards routinely face 24 V sensor lines, inductive loads, and wiring faults. The BAW100G BK's 75 V reverse voltage rating provides substantial margin above the 24 V nominal bus, and its dual independent diodes serve input clamping and output steering roles on one footprint. The SOT-143 surface mount case withstands standard industrial reflow profiles, and the PBFREE lead-free finish meets RoHS requirements common in industrial equipment. In PLC digital input modules, one diode of the array can clamp negative line transients while the other steers wetting-current paths. Designers should derate for ambient temperatures near 85 C by confirming datasheet forward-current derating curves, and maintain series impedance so worst-case fault currents remain well below the 250 mA DC rating.
Recommended
RF and Communications Equipment Switching
Communications and RF front-end boards use high-speed silicon switching diodes for bias switching, PIN-style steering of low-frequency control lines, and DC blocking/protection functions. The BAW100G BK's fast switching characteristics and electrically isolated dual-diode structure make it appropriate for control-path duties adjacent to RF circuits, such as switching attenuator states or clamping control inputs on RF switches. The small SOT-143 footprint permits placement near the controlled node, shortening control-line stubs. The 75 V rating and 250 mA current rating comfortably handle bias rails in 5 V and 12 V radios. For direct RF signal-path rectification, verify junction capacitance and recovery specifications in the datasheet against the operating frequency before committing the design.
Recommended
Recommended Products Summary
Engineering reference data for BAW100G BK β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | BAW100G TR | BAW100 BK | BAW100 TR | BAW56WT1H | BAW56E6_R1_00001 |
|---|---|---|---|---|---|---|
| Package | SOT-143 (TO-253-4, TO-253AA) | SOT-143 (TO-253-4, TO-253AA) - same | SOT-143 (TO-253-4, TO-253AA) - same | SOT-143 (TO-253-4, TO-253AA) - same | SOT-143 class - same outline | SOT-143 class - same outline |
| Brand | Central Semiconductor | Central Semiconductor | Central Semiconductor | Central Semiconductor | onsemi | Panjit International |
| Reverse Voltage (Vr) Max | 75 V | 75 V | 75 V | 75 V | 75 V class | 75 V |
| Packaging | Bulk (BK) | Tape & Reel (TR) | Bulk | Tape & Reel (TR) | Bulk | Tape & Reel (TR) |
Key Differentiators
- Two independent isolated diodes on one SOT-143 footprint (vs BAW56E6_R1_00001)
- Active-device availability for new designs (vs BAW100G BK)
- Lead-free PBFREE construction (vs BAW100 (tin/lead variant))
- 75 V reverse rating with margin on 24 V rails (vs BAW56WT1H)
Design Notes
The SOT-143 case has one enlarged lead (typically pin 3) that prevents wrong rotation only if the PCB footprint matches the datasheet outline. A common production error is a footprint drawn to a generic SOT-23-4 or different dual-diode pinout, causing 90-degree misorientation that shorts the diodes across the rails. Before release, overlay your footprint on the case outline drawing in the Central Semiconductor BAW100/BAW100G datasheet and add pin-1 polarity marks on silkscreen. Also confirm diode topology: BAW100G diodes are independent, unlike common-anode BAW56-type parts.
Place the diode array within a few millimeters of the node it protects (relay coil, data-line connector, or IC input). Every millimeter of trace adds inductance (~1 nH/mm) that degrades clamping response during fast transients and enlarges the flyback loop when used across a coil. Use short, direct traces for the high-current diode path with adequate width for the 250 mA DC rating; a 0.3 mm trace comfortably carries this current on 1 oz copper. Thermal dissipation at rated current is modest, so no dedicated thermal copper is required.
BAW100G BK is discontinued per Central Semiconductor PDN01220 (Rev 001, February 9, 2023), which also notes BAW100G TR remains active. Do not release new production builds against BAW100G BK bulk stock. Update the bill of materials to BAW100G TR now - it is the identical die and package in tape and reel, requiring no ECO beyond the part number and packaging code. Secure last-time-buy quantities only for legacy field-repair inventory.
Compliance Information
PBFREE suffix indicates lead-free, RoHS-compliant construction per DigiKey product listing and Central Semiconductor naming convention. REACH, halogen-free, and conflict-minerals status not stated in provided data.
