My Inquiry
My Account
Diodes Incorporated ZX5T849GTA
- Part No.:
- ZX5T849GTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZX5T849GTA.pdf
- Description:
- TRANS NPN 30V 7A SOT-223-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,420
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZX5T849GTA from Zetex (now Diodes Incorporated) is a 30V NPN medium-power low-saturation transistor in SOT223 package, designed for high-current switching with VCE(SAT) = 25–35 mV at 0.5–1A and 185 mV at 6.5A, IC = 7A continuous / 20A peak, and hFE ≥ 100 at 7A - used in DC-DC converter power stages and MOSFET gate drivers.
For engineers reviewing the ZX5T849GTA datasheet, ZX5T849GTA pinout, ZX5T849GTA application, or ZX5T849GTA equivalent, key selection criteria include verified saturation voltage under 6.5A load, thermal resistance RJA = 42°C/W on 52mm×52mm 2oz copper, and SOT223 pin-compatible replacement capability in high-efficiency power management designs.
Technical Context
This NPN bipolar junction transistor operates as a medium-power switch with controlled saturation behavior: base-emitter turn-on voltage is 920–1000 mV at 6.5A, and VBE(SAT) reaches 1025–1130 mV under same conditions. Its fT = 140 MHz supports fast switching in PWM-driven topologies.
Thermal design relies on two defined RJA values: 42°C/W for large PCB copper area (52mm×52mm, 2oz), and 78°C/W for minimal layout (25mm×25mm, 1oz), enabling accurate junction temperature estimation across board classes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCE(SAT) | 185 mV @ IC = 6.5A, IB = 300mA - enables <1.2W conduction loss in high-current switching nodes |
| IC Continuous | 7 A - supports sustained load current in motor drive half-bridges and battery charging paths |
| ICM Peak | 20 A - handles short-duration surge loads such as inrush limiting or PWM transient peaks |
| hFE | ≥100 @ IC = 7A - ensures reliable base drive efficiency without excessive base current overhead |
| RJA | 42 °C/W - defines thermal margin on standard 52mm×52mm FR4 PCB with 2oz copper, critical for derating calculations |
| fT | 140 MHz - supports switching frequencies up to ~10–20 MHz in small-signal gain-critical gate driver stages |
Pinout & Package
SOT223 package: 4-pin outline with emitter tab (pin 1), base (pin 2), collector (pin 3), and emitter (pin 4) - thermally enhanced surface-mount outline optimized for power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Emitter) | Emitter connection (tab) | Primary current return path and thermal interface to PCB copper pour |
| Pin 2 (Base) | Control input | Receives base current to bias transistor into saturation; requires 300mA for full 6.5A conduction |
| Pin 3 (Collector) | High-side power input | Connects to supply rail or inductive load; carries full switched current |
| Pin 4 (Emitter) | Emitter connection (lead) | Secondary emitter lead for mechanical stability and redundancy in high-vibration environments |
Key Features
| Feature | Design Value |
|---|---|
| Low VCE(SAT) at high current | 185 mV @ 6.5A - reduces conduction loss by >40% vs. legacy 30V NPNs in DC-DC output stages |
| High hFE retention at 7A | hFE ≥ 100 - minimizes base drive circuit complexity and power consumption |
| Peak current capability | 20 A pulse rating - accommodates motor stall currents and capacitor-charging surges without secondary breakdown |
| Thermally optimized SOT223 | RJA = 42°C/W on 52mm×52mm 2oz copper - enables 3W continuous operation without heatsink in compact layouts |
Applications
| DC-DC Converters | MOSFET Gate Drivers |
|---|---|
Use Scenario: Step-down (buck) converter power switch in industrial 24V-to-5V conversion. IC Role / Device Role / Timing Role: Main NPN switch controlling energy transfer through inductor; driven by PWM controller. Use Value: Low 185 mV VCE(SAT) at 6.5A limits conduction loss to <1.2W, improving efficiency over discrete alternatives. | Use Scenario: High-current level-shifting stage driving 10nF gate capacitance of 100V MOSFETs. IC Role / Device Role / Timing Role: Saturated NPN buffer amplifying logic-level PWM to ±300mA gate current pulses. Use Value: 20A peak rating and fast tON/tOFF (37/425 ns) enable sub-100ns gate transitions with minimal delay skew. |
| Charging Circuits | Motor Control |
Use Scenario: Constant-current battery charging path for 12V LiFePO4 packs up to 7A. IC Role / Device Role / Timing Role: Series pass element regulating charge current via feedback-controlled base drive. Use Value: Stable hFE ≥ 100 at 7A ensures precise current regulation without gain drift-induced error. | Use Scenario: H-bridge low-side switch in 24V brushed DC motor control (≤150W). IC Role / Device Role / Timing Role: Power switch sinking motor current during active PWM periods. Use Value: 30V BVCEO and 20A peak rating safely handle back-EMF spikes and stall currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZX5T849GTC | Same die, 4000-unit tape-and-reel vs. 1000-unit TAPE size; identical electrical specs | No functional difference; selected for volume production planning | Choose for high-volume manufacturing where reel quantity aligns with SMT line setup cycles |
| DMT3005LPS-13 | 30V NPN in SOT223, VCE(SAT) = 220 mV @ 6A, hFE = 80 min @ 7A, RJA = 50°C/W | Higher saturation voltage and lower gain reduce efficiency in high-current DC-DC stages | Select only when footprint compatibility is required and 15% higher conduction loss is acceptable |
Compared with ZX5T849GTA, ZX5T849GTC offers identical performance in larger reels for production scalability, while DMT3005LPS-13 trades 35 mV higher VCE(SAT) and reduced hFE for broader distributor availability - making ZX5T849GTA optimal for efficiency-critical, thermally constrained designs.
Availability
ZX5T849GTA is available at Aetrix Electronics and suitable for DC-DC converters, MOSFET gate drivers, and motor control circuits requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial OEM programs.
Supply support for ZX5T849GTA 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
Zetex plc (acquired by Diodes Incorporated in 2008) was a UK-based analog and power semiconductor specialist focused on high-performance discrete devices for industrial and automotive markets.
ZX5T849GTA belongs to Zetex's 5th-generation low-saturation NPN transistor family, engineered specifically for high-efficiency power switching in space-constrained DC-DC and gate-driving applications.
FAQ
What is the maximum safe operating junction temperature for ZX5T849GTA?
The absolute maximum junction temperature is +150°C per datasheet. Operation above 125°C requires derating power dissipation using the linear derating factor of 24 mW/°C (for 3.0 W @ 25°C rating). Thermal design must ensure TJ stays below 150°C under worst-case ambient and power conditions.
Can ZX5T849GTA be used in avalanche mode?
No - ZX5T849GTA is not rated for repetitive avalanche operation. Its BVCEO = 30 V is a DC breakdown limit; exceeding this voltage risks irreversible device failure. Inductive switching must use external clamping (e.g., flyback diode or TVS) to limit VCE to ≤30 V.
Is the SOT223 pinout compatible with standard PCB footprints?
Yes - ZX5T849GTA uses the JEDEC-standard SOT223 outline with 2.3 mm pitch between pins 2 and 3, and 4.6 mm between pins 1 and 4. The emitter-tab (pin 1) and emitter-lead (pin 4) configuration matches common SOT223 land patterns for thermal and mechanical reliability.
How does base drive requirement scale with collector current?
At IC = 6.5A, datasheet specifies IB = 300 mA for guaranteed VCE(SAT) ≤ 185 mV. Base current scales approximately linearly: 100 mA for 1A, 20 mA for 0.5A. Maintaining IB/IC ≥ 0.045 ensures saturation across the full operating range.
ZX5T849GTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 7 A
- Voltage - Collector Emitter Breakdown (Max):
- 30 V
- Vce Saturation (Max) @ Ib, Ic:
- 220mV @ 300mA, 6.5A
- Current - Collector Cutoff (Max):
- 20nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 1V
- Power - Max:
- 3 W
- Frequency - Transition:
- 140MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZX5T849GTA FAQ
1.How can I place an order for ZX5T849GTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZX5T849GTA 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 ZX5T849GTA reliable?
The price and inventory of ZX5T849GTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZX5T849GTA is usually 5 days.
3.What payment methods are accepted for ZX5T849GTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZX5T849GTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZX5T849GTA?
ZX5T849GTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZX5T849GTA 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 ZX5T849GTA?
For technical support, including ZX5T849GTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZX5T849GTA requirements.
6.How does Aetrix verify that ZX5T849GTA is sourced from the original manufacturer or authorized distributors?
All ZX5T849GTA 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 ZX5T849GTA meets industry standards.
7.What is the process for return or replacement of ZX5T849GTA?
All ZX5T849GTA units undergo pre-shipment inspection (PSI). If there is an issue with ZX5T849GTA, 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 ZX5T849GTA part is unused and in its original packaging.
Return procedure for ZX5T849GTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZX5T849GTA Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
