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Diodes Incorporated ZXTN5551ZTA
- Part No.:
- ZXTN5551ZTA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- TO-243AA
- Datasheet:
-
ZXTN5551ZTA.pdf
- Description:
- TRANS NPN 160V 0.6A SOT-89-3
- Quantity:
- Payment:
- Shipping:
Inventory:580
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Product details
Overview
ZXTN5551ZTA from Diodes Incorporated (formerly Zetex Semiconductors) is a high-voltage NPN bipolar junction transistor in SOT89 package, rated for 160 V VCEO, 600 mA continuous collector current, and 1.2 W power dissipation. It delivers 130 MHz transition frequency and hFE of 80–145 at 10 mA, serving in high-voltage amplification and switching stages of industrial power supplies and LED drivers.
For engineers reviewing the ZXTN5551ZTA datasheet, ZXTN5551ZTA pinout, ZXTN5551ZTA application, or ZXTN5551ZTA equivalent, key selection considerations include its 160 V breakdown rating, SOT89 thermal performance (RJA = 104 °C/W), saturation voltage under 200 mV at 50 mA, and complementary PNP pairing with ZXTP5401Z.
Technical Context
This discrete NPN transistor operates as a medium-power, high-voltage switch or linear amplifier. Its BVCEO = 160 V and BVCBO = 180 V support operation in flyback snubbers and relay drivers where transient clamping is critical. The fT = 130 MHz enables use in low-frequency RF amplifiers up to ~30 MHz with stable gain.
Designed for surface-mount implementation on FR4 PCBs with single-sided 1 oz copper, it exhibits defined thermal derating (9.6 mW/°C) and junction-to-ambient resistance of 104 °C/W under standard mounting conditions. Its hFE variation across IC = 1–50 mA reflects intentional design for predictable DC biasing in Class-A and switching topologies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 160 V - supports operation in 120 VAC line-derived circuits with margin against transients |
| IC(cont) | 600 mA - enables driving moderate-current loads such as solenoids or LED strings without heatsinking |
| PD | 1.2 W at TA = 25°C - usable in compact SOT89 footprint with controlled board-level thermal management |
| fT | 130 MHz - sufficient for broadband amplification up to 30 MHz and fast-switching applications |
| hFE | 80–145 @ IC = 10 mA - provides stable DC gain for bias networks in linear regulators and sensor interfaces |
| VCE(sat) | 115–200 mV @ IC = 50 mA - minimizes conduction loss in low-duty-cycle switching nodes |
| RJA | 104 °C/W - defines temperature rise per watt on standard 25 mm × 25 mm FR4 layout |
Pinout & Package
Package: SOT89 - thermally enhanced 3-pin surface-mount package with exposed emitter pad for improved heat transfer. Dimensions: 4.5 mm × 2.5 mm × 1.5 mm (L × W × H), lead pitch 1.5 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Emitter) | Current sink terminal | Connected to ground or low-side return path; electrically and thermally tied to exposed pad |
| 2 (Base) | Control input | Receives forward bias current to enable conduction; requires series resistor for current limiting |
| 3 (Collector) | High-voltage output node | Handles up to 160 V potential; connected to load or supply rail in common-emitter configuration |
Key Features
| Feature | Design Value |
|---|---|
| High breakdown voltage | 160 V VCEO enables direct interface with 100–120 VAC-derived rails and flyback transformer secondaries |
| SOT89 thermal performance | 104 °C/W RJA allows 0.8 W continuous dissipation at 75°C ambient without heatsink |
| Controlled hFE spread | Min 80 @ 1 mA ensures reliable turn-on in low-current bias networks across production lots |
| Fast switching timing | tr = 64 ns / tf = 140 ns supports PWM frequencies up to 2 MHz in non-critical timing applications |
Applications
| Industrial Power Supply | LED Driver Circuit |
|---|---|
Use Scenario: Used in primary-side switching or secondary-side linear regulation of offline AC/DC converters delivering 5–24 V at ≤500 mA. IC Role / Device Role / Timing Role: NPN switch controlling base drive of main power transistor or regulating current through feedback optocoupler LED. Use Value: 160 V rating accommodates reflected flyback voltages; 600 mA IC supports auxiliary supply loads without derating. | Use Scenario: Drives constant-current LED strings in signage and architectural lighting powered from 24–48 V DC rails. IC Role / Device Role / Timing Role: Linear pass element in adjustable current sink topology, biased by op-amp feedback loop. Use Value: Low VCE(sat) (<200 mV) reduces power loss and thermal stress at 350 mA operating point. |
| Relay Driver Stage | High-Voltage Sensor Interface |
Use Scenario: Interfaces microcontroller GPIO to 12–24 V coil relays in PLC I/O modules and building automation panels. IC Role / Device Role / Timing Role: Digital switch amplifying logic-level signals to energize relay coils with flyback diode protection. Use Value: BVCEO > 160 V withstands inductive kickback spikes exceeding 100 V without clamping circuitry. | Use Scenario: Amplifies low-level analog signals from high-side current shunts or HV voltage dividers in motor drives. IC Role / Device Role / Timing Role: High-input-impedance common-emitter amplifier stage isolating measurement circuitry from 100+ V bus domains. Use Value: 130 MHz fT preserves signal fidelity up to 10 kHz bandwidth while maintaining DC accuracy via stable hFE. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage NPN transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DXT5551 | Same die, optimized for new designs; identical VCEO, IC, fT, but improved hFE consistency and tighter VBE(sat) distribution | Drop-in replacement with enhanced process control; preferred for volume production and long-term BOM stability | Select DXT5551 for new designs requiring guaranteed parametric yield and extended lifecycle support |
| MJD127G | Higher VCEO (100 V), lower fT (3 MHz), TO-252 package; 8 A IC rating but larger footprint and higher RJA | Not suitable for space-constrained SOT89 layouts; better for high-current, lower-frequency switching where thermal mass matters more than speed | Choose MJD127G only when >500 mA average current and ≥100 V standoff are required, and board area permits TO-252 |
Compared with DXT5551, ZXTN5551ZTA offers identical core specs but looser hFE and VBE(sat) tolerances; versus MJD127G, it trades current capacity and package size for higher speed and smaller footprint-making it optimal for compact, medium-voltage, medium-speed switching.
Availability
ZXTN5551ZTA is available at Aetrix Electronics and suitable for industrial power supplies, LED driver circuits, relay driver stages, and high-voltage sensor interfaces requiring stable component supply and legacy design continuity.
Supply support for ZXTN5551ZTA 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
Diodes Incorporated acquired Zetex Semiconductors in 2008 and maintains its portfolio of high-performance discrete semiconductors with focus on reliability, thermal efficiency, and application-specific optimization.
ZXTN5551ZTA belongs to Zetex's high-voltage bipolar transistor product line, engineered for robust operation in industrial and automotive-adjacent power management systems where voltage margin and thermal predictability are critical.
FAQ
Is ZXTN5551ZTA RoHS compliant?
Yes, ZXTN5551ZTA is RoHS compliant and meets the EU Directive 2011/65/EU requirements. It contains no lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls (PBB), or polybrominated diphenyl ethers (PBDE). Compliance is verified per Diodes Incorporated's material declarations and test reports.
What is the maximum safe operating temperature for ZXTN5551ZTA?
The junction temperature must not exceed 150°C, and storage temperature range is –55°C to +150°C. With RJA = 104 °C/W and 1.2 W max power, ambient temperature must stay below 27°C for full-rated operation; derating begins at 9.6 mW/°C above 25°C ambient.
Can ZXTN5551ZTA be used in linear regulator applications?
Yes-it is routinely used as a pass transistor in adjustable linear regulators due to its stable hFE, low VCE(sat), and 160 V headroom. For 24 V input / 5 V output at 300 mA, power dissipation is ~5.7 W; external heatsinking is required beyond 0.8 W in SOT89 configuration.
Does ZXTN5551ZTA have a complementary PNP device?
Yes, ZXTP5401Z is the designated complementary PNP transistor-same SOT89 package, matched 160 V VCEO, 600 mA IC, and compatible thermal characteristics. Both devices are characterized for push-pull and H-bridge configurations in industrial motor control and audio output stages.
ZXTN5551ZTA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Last Time Buy
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 600 mA
- Voltage - Collector Emitter Breakdown (Max):
- 160 V
- Vce Saturation (Max) @ Ib, Ic:
- 200mV @ 5mA, 50mA
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 80 @ 10mA, 5V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 130MHz
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
ZXTN5551ZTA FAQ
1.How can I place an order for ZXTN5551ZTA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXTN5551ZTA 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 ZXTN5551ZTA reliable?
The price and inventory of ZXTN5551ZTA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXTN5551ZTA is usually 5 days.
3.What payment methods are accepted for ZXTN5551ZTA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXTN5551ZTA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXTN5551ZTA?
ZXTN5551ZTA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXTN5551ZTA 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 ZXTN5551ZTA?
For technical support, including ZXTN5551ZTA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXTN5551ZTA requirements.
6.How does Aetrix verify that ZXTN5551ZTA is sourced from the original manufacturer or authorized distributors?
All ZXTN5551ZTA 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 ZXTN5551ZTA meets industry standards.
7.What is the process for return or replacement of ZXTN5551ZTA?
All ZXTN5551ZTA units undergo pre-shipment inspection (PSI). If there is an issue with ZXTN5551ZTA, 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 ZXTN5551ZTA part is unused and in its original packaging.
Return procedure for ZXTN5551ZTA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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