BTA425Y-800BT - 800V 25A 3Q Hi-Com Triac | WeEn Semiconductors
Référence : BTA425Y-800BT ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.85 | $1,85 |
| 10 | $1.58 | $15,80 |
| 100 | $1.22 | $122,00 |
| 500 | $1.05 | $525,00 |
| 1 000 | $0.92 | $920,00 |
BTA425Y-800BT Présentation
A TRIAC (triode for alternating current) is a bidirectional thyristor that conducts current in both AC half-cycles from a single gate signal, making it the workhorse of low-frequency AC power control. Triacs sit in the thyristor family (thyristor > TRIAC > 3Q Hi-Com Triac) and the broader discrete semiconductor hierarchy. The 'Hi-Com' designation refers to high-commutation variants optimized to withstand fast voltage transitions (high dV/dt) at line-frequency zero-crossings without parasitic retriggering.
Key features include 800 V repetitive peak off-state voltage (VDRM), 25 A RMS on-state current (IT(RMS)), a non-insulated tab package variant option, and a gate trigger current optimized for microcontroller-compatible logic-level triggering. The TO-220AB package offers a low thermal resistance path to a clip-on or PCB-mounted heatsink, enabling continuous high-current switching in motor and heater loads. The BTA prefix denotes an isolated tab; the BTY/BTB prefix variants share the same silicon.
Technically, the device uses a planar passivated die structure with an internal ceramic-isolated mounting base, providing 2500 V RMS isolation between the metal tab and the heat sink pad. The 3Q Hi-Com architecture suppresses commutating dV/dt failures common in inductive loads (motors, transformers, solenoids), allowing designers to omit snubber networks in many applications and reduce BOM cost.
Typical applications include AC motor speed controls, solid-state relays (SSRs), heating regulation, light dimmers, and general-purpose AC static switches in industrial white goods, HVAC controls, and home appliances. The 25 A rating makes it suitable for direct switching of 1-3 HP universal motors and up to 5 kW resistive heater loads on 230 V mains.
When designing with this device, derate the on-state current by at least 25% when using a small heatsink, and ensure the gate drive provides sufficient pulse current (>50 mA) at the desired firing angle. Avoid mounting the tab to a grounded heatsink without an insulating pad if the package variant is non-isolated; the BTA-insulated variant of the BTA425Y simplifies single-screw mounting.
This page synthesizes the WeEn datasheet (Rev.03, 19 February 2024), live distributor pricing from DigiKey/Mouser/Octopart, drop-in alternative cross-references, and design guidance beyond what is found on the manufacturer product page.
Alternatives de remplacement direct pour BTA425Y-800BT — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
BTA425Y-800BTQ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BTA425X-800BT
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BTA425Y-800BQ
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
BT139-800
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BTA26-800CW
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAC228-8
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
BTA425Y-800BT Spécifications
| Manufacturer | WeEn Semiconductors |
| Part Number | BTA425Y-800BT |
| Device Type | 3Q Hi-Com Triac (three-quadrant, high commutation) |
| Repetitive Peak Off-State Voltage (VDRM) | 800 V |
| RMS On-State Current (IT(RMS)) | 25 A |
| Boîtier | TO-220AB (SOT78D), internally insulated |
| Triggering Quadrants | 3 quadrants (Q1, Q2, Q3) |
| Type de montage | Through Hole |
| Tab Isolation | Internally insulated (BTA series) |
| Statut RoHS | Compliant (per WeEn datasheet) |
Configuration des broches de BTA425Y-800BT
| Broche 1 | MT1 — Main Terminal 1 (anode/cathode, bidirectional) |
| Broche 2 | MT2 — Main Terminal 2 (anode/cathode, bidirectional) |
| Broche 3 | Gate — Gate trigger input |
| Broche Tab | MT2 (isolated) — Main Terminal 2 internally connected; insulated from heatsink via SOT78D ceramic isolation |
Zone de fonctionnement sûr - On-State Current vs Voltage
Applications typiques
BTA425Y-800BT convient pour 6 applications: AC Universal Motor Speed Control, Solid-State Relay (SSR) for Industrial Heaters, Light Dimmer for Incandescent and LED Lamps, HVAC Solenoid and Valve Control, Home Appliance Power Switching, Industrial AC Static Switch and Contactor.
AC Universal Motor Speed Control
The BTA425Y-800BT is well suited to phase-angle speed control of single-phase universal (series-wound) motors in 230 V power tools, kitchen mixers, and small appliances. Its 25 A RMS rating covers motors up to approximately 1.5 HP continuous, and the 800 V VDRM absorbs inductive kickback transients that exceed the 230 V RMS line. The 3Q Hi-Com architecture suppresses commutating dV/dt failure at AC line zero-crossings, which is the dominant failure mode in inductive motor loads and the reason engineers prefer 3Q parts over 4Q parts in this application. Typical circuit uses a MOC3021 zero-cross optocoupler or a digital micro timer for phase-angle firing.
Recommandé
Solid-State Relay (SSR) for Industrial Heaters
In solid-state relay designs for industrial heating elements, the BTA425Y-800BT serves as the AC switching element. Its 800 V rating tolerates line transients on 230 V / 400 V industrial mains, while the 25 A continuous current handles resistive heater loads up to approximately 5 kW. The internally insulated TO-220AB tab simplifies single-screw heatsink mounting without an additional mica pad, reducing assembly cost. Pair with a zero-cross optocoupler to minimize EMI and a small RC snubber (typically 100 ohm + 100 nF) to suppress dV/dt from the heater's cold-to-hot resistance change.
Recommandé
Light Dimmer for Incandescent and LED Lamps
Leading-edge TRIAC dimmers for incandescent, halogen, and trailing-edge compatible LED lamps benefit from the BTA425Y-800BT's robust 25 A surge handling and 800 V blocking margin. The 3Q Hi-Com commutation characteristic prevents false retriggering when dimming low-wattage LED loads that present high dV/dt at zero-cross. For 1 kW dimmer channels, the part can switch the full load directly; for higher power, two parts may be paralleled with current-balancing inductors. The TO-220AB package mounts to a chassis plate that doubles as the heatsink.
Recommandé
HVAC Solenoid and Valve Control
In HVAC zone valve and solenoid actuator circuits, the BTA425Y-800BT switches 24 V to 230 V AC coils that present heavy inductive kickback. Its high commutating dV/dt capability means the device survives the rapid voltage transitions that occur when the AC line reverses across the coil's stored energy. The 3Q triggering prevents the TRIAC from latching on its own back-EMF in some mis-trigger scenarios. Typical circuits drive the gate from a microcontroller PWM output through an optocoupler for galvanic isolation.
Recommandé
Home Appliance Power Switching
White goods such as washing machines, dishwashers, and induction cooktops use the BTA425Y-800BT to switch heater banks, pump motors, and fan loads. The 25 A rating covers multi-kW heater elements directly without paralleling. The 800 V VDRM provides margin against line surges and inductive transients from adjacent motor windings. The internally insulated package simplifies chassis-level safety approvals and reduces the heatsink assembly to a single screw.
Recommandé
Industrial AC Static Switch and Contactor
Replacing mechanical contactors with silent solid-state AC switches benefits from the BTA425Y-800BT's arc-free operation and unlimited switching cycles. Used in conjunction with zero-cross firing, the device eliminates the inrush arcing that degrades mechanical contacts. The 25 A rating covers three-phase per-leg switching up to 5 kW per phase on 230 V three-phase systems when used with proper heatsinking. Three BTA425Y-800BTs in a star or delta configuration replace an entire electromechanical contactor bank.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour BTA425Y-800BT — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | BTA425Y-800BTQ | BTA425X-800BT | BT139-800 | BTA26-800CW |
|---|---|---|---|---|---|
| Package | TO-220AB (SOT78D), insulated | TO-220AB (SOT78D), insulated - same | TO-220AB (SOT78D), insulated - same | TO-220AB - same footprint | TO-220AB - same footprint |
| Brand | WeEn Semiconductors | WeEn Semiconductors - same | WeEn Semiconductors - same | NXP Semiconductors - cross-brand | STMicroelectronics - cross-brand |
| VDRM (Repetitive Peak Off-State Voltage) | 800 V | 800 V - same | 800 V - same | 800 V - same | 800 V - same |
| IT(RMS) On-State Current | 25 A | 25 A - same | 25 A - same | 16 A (-36%) | 25 A - same |
| Triggering Quadrants | 3Q (Q1, Q2, Q3) Hi-Com | 3Q Hi-Com - same | 4Q standard | 4Q standard | 4Q snubberless logic-level |
| Commutation Type | Hi-Com (high dV/dt) | Hi-Com - same | Standard commutation | Standard | Snubberless |
| Tab Insulation | Insulated (BTA prefix) | Insulated - same | Insulated - same | Non-insulated (mica pad required) | Insulated - same |
| Approx. Unit Price (qty 100, USD) | 1.22 | 1.22 - same | 1.15 - similar | 0.85 - lower | 1.35 - slightly higher |
| RoHS Compliant | Yes | Yes - same | Yes - same | Yes | Yes |
Principaux différenciateurs
- 3Q Hi-Com commutation architecture suppresses inductive load false retriggering (vs BTA425X-800BT (4Q standard))
- Internally insulated tab eliminates external mica pad requirement (vs BT139-800 (NXP, non-insulated))
- 25 A continuous RMS rating in standard TO-220AB footprint (vs BT139-800 (16 A))
Notes de conception
Estimated: at 25 A RMS continuous on-state current with a 1.5 C/W heatsink-to-ambient thermal resistance, the junction-to-ambient thermal path is approximately 1.5 + 0.7 (junction-to-case) = 2.2 C/W. Power dissipation at full conduction with VT of approximately 1.6 V is around 40 W RMS-adjusted, requiring either a substantial heatsink or significant current derating. For continuous 25 A operation, mount to a chassis plate with at least 100 cm^2 surface area or a dedicated aluminum fin heatsink rated 1 C/W or lower.
The BTA prefix indicates an internally insulated tab, but verify the actual part marking on incoming inspection - counterfeit or remarked non-isolated parts (BTA vs BTB/BTY prefix) can fail with catastrophic short to the heatsink. Use a 2500 V RMS hi-pot test on the tab-to-heatsink interface during incoming QA. Also avoid routing gate traces parallel to MT2 traces - the high dV/dt on MT2 can capacitively couple into the gate and cause false triggering in high-impedance gate drive circuits.
For through-hole TO-220AB mounting, use a PCB copper pad area of at least 50 mm^2 on both sides of the board connected by thermal vias to spread heat from the leads. Gate drive traces should be kept short (<25 mm) and routed away from MT2 switching nodes. Include a gate resistor of 100-470 ohm in series with the gate to limit peak gate current and reduce EMI. Place the RC snubber (typically 100 ohm + 100 nF) within 10 mm of MT1 and MT2 pins.
Phase-angle TRIAC dimmers and motor controls generate significant EMI due to the non-zero-voltage switching. Add an input EMI filter (X-capacitor 100 nF + common-mode choke 10-33 mH) to comply with EN 55014 / EN 55015 conducted emissions. Use zero-cross optocouplers (MOC3041) where possible to minimize switching transients; only use random-phase (MOC3021) when leading-edge dimming is required for lamp or motor control.
Informations de conformité
RoHS and REACH compliance per WeEn Semiconductors datasheet Rev.03 (19 February 2024). Not AEC-Q100 qualified - this is a discrete power component not intended for automotive safety-critical applications. For automotive-grade TRIAC equivalents, consider AEC-Q100 qualified variants from NXP or STMicroelectronics.
