FZT849TA - 30V 7A NPN BJT, 100MHz, SOT-223 | Diodes Incorporated
Référence : FZT849TA ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $0.78 | $0,78 |
| 10 | $0.69 | $6,90 |
| 100 | $0.55 | $55,00 |
| 500 | $0.46 | $230,00 |
| 1 000 | $0.39 | $390,00 |
| 3 000 | $0.34 | $1 020,00 |
FZT849TA Présentation
A bipolar junction transistor (BJT) is a three-terminal semiconductor device formed by sandwiching either P-type or N-type material between two layers of the opposite polarity, creating either NPN or PNP polarity. BJTs use a small base current to control a much larger collector current, acting as a current amplifier or a saturated switch. The FZT849TA belongs to the NPN variant and is engineered for medium-power switching and linear applications where a saturated high-side or low-side switch must deliver several amps with low conduction loss.
Key features include a VCBO of 60V, VCER of 40V, low VCE(sat) of 250 mV typical at 6.5 A, complementary PNP partner FZT949, and a built-in collector-tab that simplifies PCB heatsinking. The device is lead-free, RoHS compliant, halogen-free, and qualified to AEC-Q101 for automotive power-management and lighting loads.
Architecturally, the FZT849TA uses a planar epitaxial base design with a high-current die capable of sustaining 20A pulsed for inductive-load switching. The SOT-223 footprint exposes the collector through the rear tab, reducing thermal resistance from junction to ambient (θJA) to roughly 76 °C/W on the datasheet's reference copper pad, allowing multi-watt dissipation without a discrete heatsink.
Typical applications include DC-DC converter pass elements, motor driver low-side switches, automotive relay replacement, solenoid drivers, LED current regulators, and battery-protection circuits. The combination of high ICM and low VCE(sat) makes it especially suited for portable and automotive load management where efficiency and thermal performance dominate the BOM.
When designing with this device, derate power dissipation against ambient temperature using the θJA figure from the datasheet. Drive the base with sufficient base current to force saturation—roughly IC/10—and include a base-emitter resistor to guarantee fast turn-off in PWM applications.
This page consolidates distributor stock, parametric comparisons, drop-in alternatives, and PCB thermal guidance not found in the bare manufacturer datasheet.
Alternatives de remplacement direct pour FZT849TA — 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 :
FZT849
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
FZT949TA
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ZXTN2007GTA
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ZTX849
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ZTX849STZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
FZT849TA Valeurs maximales et caractéristiques électriques
| Type de transistor | NPN Bipolar (BJT) |
| Boîtier | SOT-223-3 (4-pin, 3+tab) |
| Tension collecteur-base (Vcbo) | 60 V |
| Tension collecteur-émetteur (Vceo) | 30 V |
| Collector-Emitter Voltage (VCER) | 40 V |
| Tension émetteur-base (Vebo) | 7 V |
| Continuous Collector Current (IC) | 7 A |
| Peak Pulse Collector Current (ICM) | 20 A |
| Power Dissipation (PD) | 3 W |
| Fréquence de transition (ft) | 100 MHz |
| DC Current Gain (hFE) | 100 min at 1A / 10V |
| VCE(sat) Typical | 250 mV at IC = 6.5 A |
| Equivalent On-Resistance RCE(sat) | 36 mΩ at 5 A |
| Plage de température de fonctionnement | -55 °C to +150 °C |
| Type de montage | Surface Mount |
| RoHS / Lead-Free | Yes / Yes |
| AEC-Q101 Qualification | Qualified |
| Complementary PNP | FZT949 |
Configuration des broches de FZT849TA
| Broche 1 | Base — Base control terminal |
| Broche 2 | Collector — Collector (electrically tied to tab) |
| Broche 3 | Emitter — Emitter terminal |
| Broche 4 | Collector (Tab) — Collector / thermal pad; solder to copper pour |
FZT849 Zone de fonctionnement sûr (DC)
Applications typiques
FZT849TA convient pour 7 applications: 12V Automotive Relay Replacement, DC-DC Converter Pass / Switch Element, Motor Driver Low-Side Switch, LED Current Regulator / Driver, Solenoid and Valve Driver, Battery Protection and Load Switching, Linear Voltage Regulator Pass Element.
12V Automotive Relay Replacement
The FZT849TA's 7 A continuous collector current, 36 mΩ RCE(sat) at 5 A, and AEC-Q101 qualification make it ideal for direct-replacement of electromechanical relays on automotive 12 V buses. With VCBO of 60 V and VCER of 40 V, the device tolerates 12 V load-dump transients up to ~35 V (clamped). Designers typically drive it with a Darlington buffer or a microcontroller PWM output driving ~50 mA base current, switching inductive loads like fuel pumps, HVAC blowers, and headlamp relays. The SOT-223 collector tab simplifies thermal management on chassis-grounded copper pours.
Recommandé
DC-DC Converter Pass / Switch Element
In buck and boost converters operating up to 30 V, the FZT849TA serves as the main switching transistor with its 100 MHz fT enabling high-frequency PWM operation. The 250 mV VCE(sat) at 6.5 A minimizes conduction loss, while the 20 A ICM rating provides ample margin for transient overload. Place it on the low-side with a freewheeling diode; the SOT-223 collector tab thermal pad ties to a 25 mm × 25 mm copper pour to sustain 2-3 W dissipation. Designers use this part in portable battery packs, USB-PD adapters, and point-of-load regulators for industrial control.
Recommandé
Motor Driver Low-Side Switch
The FZT849TA excels as a low-side switch for brushed DC motors in robotics, small appliances, and automotive actuators. Its 7 A continuous and 20 A peak pulse current accommodate motor inrush, while the 36 mΩ on-resistance keeps dissipation under 1 W for typical 3 A continuous motor loads. Drive the base at ~10% of IC (around 300-700 mA for 3-7 A motors) with a base-emitter resistor for fast turn-off. The SOT-223 footprint saves board space versus TO-220 alternatives, and the integrated collector tab provides thermal relief for sustained motor stall currents.
Recommandé
LED Current Regulator / Driver
For high-brightness LED arrays in automotive lighting, signage, and architectural illumination, the FZT849TA operates as a linear current regulator. Its 7 A capacity drives multiple high-power LEDs in series/parallel strings, and the low VCE(sat) reduces voltage overhead versus MOSFET alternatives in low-voltage 12-24 V systems. Configure it as a constant-current source by sensing emitter current through a small resistor and feeding back to a controller or discrete error amp. The AEC-Q101 qualification suits automotive headlamp and DRL modules where reliability is critical.
Recommandé
Solenoid and Valve Driver
Industrial solenoid valves, pneumatic actuators, and hydraulic control valves draw 1-5 A holding current with 5-10x inrush surges. The FZT849TA's 20 A peak pulse current handles inrush without current-limiting resistors, while the 7 A continuous rating covers holding current. Place a flyback diode across the solenoid to protect against the 60 V VCBO during inductive turn-off. The SOT-223 footprint allows dense multi-channel driver boards for process control and factory automation systems.
Recommandé
Battery Protection and Load Switching
In portable battery packs and UPS systems, the FZT849TA serves as a high-side or low-side load disconnect switch. Its 30 V VCEO rating covers 4-6 cell Li-ion packs (up to 25.2 V), and the 36 mΩ RCE(sat) minimizes voltage drop across the protection element. Use it with a controller that monitors battery voltage and disconnects load during over-discharge. The AEC-Q101 rating makes the part suitable for EV auxiliary battery management and e-bike pack protection circuits where reliability under thermal cycling matters.
Recommandé
Linear Voltage Regulator Pass Element
For post-regulation after a switching converter, or as a simple adjustable linear regulator, the FZT849TA acts as the series pass element. With VCBO = 60 V and PD = 3 W, it regulates loads up to 1 A continuously in TO-220-equivalent SOT-223 footprint. Use it as an emitter follower or in classic Zener-referenced linear regulator topologies for low-noise analog power rails. The low VCE(sat) gives better dropout performance than Darlington-based regulators, while the 100 MHz fT supports fast transient response in audio and instrumentation power supplies.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour FZT849TA — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | FZT849 | FZT949TA | ZXTN2007GTA | ZTX849 |
|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated | Diodes Incorporated (Zetex) |
| Package | SOT-223 | SOT-223 - same | SOT-223 - same | SOT-223 - same | SOT-223 - same |
| Polarity | NPN | NPN | PNP | NPN | NPN |
| VCEO | 30 V | 30 V | -30 V | 30 V | 30 V |
| Continuous Collector Current | 7 A | 7 A | -7 A | 7 A | 7 A |
| Peak Pulse Current | 20 A | 20 A | -20 A | 20 A | 20 A |
| AEC-Q101 Qualified | Yes | No (commercial grade) | Yes | Yes | No |
| Power Dissipation (PD) | 3 W | 3 W | 3 W | 3 W | 3 W |
Principaux différenciateurs
- AEC-Q101 qualified with extremely low RCE(sat) (vs ZTX849)
- Matched complementary PNP available on same footprint (vs ZXTN2007GTA)
- 100 MHz transition frequency for high-speed switching (vs FZT849 (commercial))
Notes de conception
Estimated: at IC = 3 A, VCE = 1 V, dissipation is 3 W, which would push junction temperature 228 °C above ambient on the standard 76 °C/W SOT-223 footprint—exceeding the 150 °C TJ,max rating. Either limit IC to ~1.7 A at TA = 25 °C or expand the copper pad to 50 mm × 50 mm with thermal vias to drop θJA to ~40 °C/W. Always check the datasheet Figure 6 (Power Derating) curve and apply at least a 20 % margin.
The SOT-223 collector tab is the only thermal path for multi-watt dissipation. Solder the tab to a copper pour of at least 25 mm × 25 mm (1 oz) for the rated 3 W; add thermal vias (0.3 mm diameter, 1 mm pitch) to inner ground planes for 2-3 W applications. Keep high-current traces wide (≥1 mm per ampere) to avoid secondary heating that feeds back into the junction. Place the base-drive resistor within 5 mm of the base pin to minimize parasitic inductance.
Driving the base with too little current (IB < IC/10) leaves the transistor in the active region and pushes VCE(sat) above 1 V, causing rapid thermal failure. Conversely, driving IB too high wastes power in the base resistor. Add a base-emitter resistor (1-10 kΩ) to guarantee turn-off in PWM operation; without it the base can remain charged after the drive signal goes low. For inductive loads, always include a flyback diode rated above the supply voltage plus 2 × L × dI/dt spike.
Keep the gate/base drive return path close to the emitter to avoid ground-bounce that can momentarily forward-bias the base-emitter junction and cause shoot-through. Route high-current traces (collector, emitter) directly to the load and to the copper pour, away from the base drive. For switching applications above 100 kHz, use a Kelvin connection to the emitter pin so the base drive sees only the bond-wire inductance, not the load-current return.
Informations de conformité
AEC-Q101 qualified per FZT849 datasheet. Lead-free, halogen-free, and RoHS compliant per Diodes Incorporated product page. MSL Level 1 per PartGenie database.
