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Diodes Incorporated ZTX855STOB
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- Part No.:
- ZTX855STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3
- Datasheet:
-
ZTX855STOB.pdf
- Description:
- TRANS NPN 150V 4A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,252
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Product details
Overview
ZTX855STOB from Diodes Incorporated is a 150V NPN medium-power transistor in E-Line (TO-92 compatible) package, rated for 4A continuous collector current and 10A peak pulse current, with low VCE(sat) of 60mV at 4A/400mA drive, operating up to +200°C junction temperature, and qualified to AEC-Q101 for automotive power switching applications.
For engineers reviewing the ZTX855STOB datasheet, ZTX855STOB pinout, ZTX855STOB application, or ZTX855STOB equivalent, key selection criteria include its 150V VCEO, 1.2W power dissipation on standard PCB layout, 100–300 hFE across 10mA–4A, 90MHz fT, and ESD robustness (≥4kV HBM), critical for high-reliability industrial and automotive switching designs.
Technical Context
This NPN bipolar junction transistor delivers high-voltage switching capability with BVCEO = 150V and BVCBO = 250V, supporting operation in DC-DC converters and motor drivers where voltage transients exceed 100V. Its thermal design enables sustained operation at TJ = +200°C, validated under AEC-Q101 stress testing.
The device exhibits low saturation voltage (VCE(sat) ≤ 60mV @ IC = 4A, IB = 400mA) and high DC current gain (hFE ≥ 100 @ IC = 1A), enabling efficient base-driven switching without external amplification in medium-power loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 150 V - Maximum collector-emitter voltage before breakdown under open-base conditions; defines safe DC blocking capability in switch-mode topologies. |
| IC (continuous) | 4 A - Sustained collector current rating at TA = 25°C with proper PCB copper area; supports 20–30W load switching. |
| VCE(sat) | 60 mV @ 4A/400mA - Low conduction loss at full rated current; reduces heat generation in linear or saturated switching modes. |
| fT | 90 MHz - Transition frequency at VCE = 10V, IC = 100mA; enables use in medium-speed switching (≤500kHz PWM). |
| RθJA | 110 °C/W - Junction-to-ambient thermal resistance on minimum pad layout; determines required board copper area for thermal management. |
| ESD HBM | ≥4000 V - Human Body Model rating per JESD22-A114; ensures robustness during manual handling and board assembly. |
Pinout & Package
E-Line (TO-92 compatible) molded plastic package with matte tin-plated leads, UL 94V-0 flammability rating, and 0.159g mass. Pin configuration verified from Diodes DS33136 Rev. 4-2 Figure "Pin-Out Configuration".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; carries full load current and sets reference for base bias network. |
| Base (B) | Control input | Receives forward-biased current to drive transistor into saturation; requires ~400mA for full 4A conduction. |
| Collector (C) | High-side current source | Connected to positive rail or inductive load; withstands 150V reverse bias when off and conducts load current when on. |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage blocking | 150V VCEO enables direct replacement of legacy 100V transistors in upgraded 12–48V industrial power rails. |
| High-temperature operation | Rated for TJ = –55°C to +200°C; supports under-hood automotive and enclosed industrial environments without derating. |
| Low saturation loss | VCE(sat) ≤ 60mV at 4A reduces conduction losses to <240mW, minimizing heatsink requirements in space-constrained designs. |
| AEC-Q101 qualification | Validated for automotive-grade reliability including HTOL, TC, and ESD stress; suitable for non-safety-critical vehicle subsystems. |
Applications
| Automotive Lighting Control | Industrial DC Motor Driver |
|---|---|
Use Scenario: Switching 24V LED headlamp arrays in commercial vehicles with PWM dimming and overvoltage protection. IC Role / Device Role / Timing Role: NPN power switch controlling high-side or low-side current path; driven by microcontroller GPIO with base resistor network. Use Value: 150V VCEO tolerates load-dump transients up to 120V; 4A rating supports >50W lamp clusters without parallel devices. | Use Scenario: Driving brushed DC motors in factory automation actuators requiring bidirectional control via H-bridge half-bridge stage. IC Role / Device Role / Timing Role: Single-ended power switch in discrete H-bridge leg; handles 4A stall current and commutation spikes. Use Value: 200°C max junction temperature allows operation inside sealed motor housings; low VCE(sat) limits self-heating during continuous duty. |
| AC-DC Auxiliary Supply | Telecom Power Sequencing |
Use Scenario: Regulating auxiliary 12V rail in offline SMPS using discrete BJT-based linear post-regulator or foldback limiter. IC Role / Device Role / Timing Role: Pass transistor in series-regulated output stage; biased in active or saturation region depending on load demand. Use Value: High hFE (100–300) simplifies base drive design; 1.2W PD supports 1A@12V output with minimal heatsinking. | Use Scenario: Enabling/disabling power domains in telecom line cards with precise sequencing and fault isolation. IC Role / Device Role / Timing Role: Load switch controlling 5V/3.3V domain entry; triggered by FPGA or PMIC enable signal. Use Value: AEC-Q101 qualification ensures long-term reliability in 24/7 infrastructure; 4kV HBM ESD protects against board-level handling damage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX955 | Complementary PNP type; identical package, voltage/current ratings, and thermal specs. | Used in push-pull or complementary symmetry circuits; not interchangeable as direct NPN replacement. | Select only when building matched NPN/PNP pairs for differential or totem-pole outputs. |
| MJD127 | TO-220 package, higher PD = 30W, lower VCEO = 100V, same IC = 4A. | Suitable for higher-power heatsinked applications but lacks 150V rating and AEC-Q101 qualification. | Choose for cost-sensitive industrial power stages where voltage margin and automotive compliance are not required. |
Compared with ZTX955 (PNP complement) and MJD127 (TO-220, 100V), ZTX855STOB uniquely combines 150V blocking, AEC-Q101 qualification, and TO-92-compatible E-Line packaging-making it optimal for compact, high-reliability, medium-voltage switching where footprint and automotive traceability matter.
Availability
ZTX855STOB is available at Aetrix Electronics and suitable for automotive lighting control, industrial DC motor drivers, AC-DC auxiliary supplies, and telecom power sequencing requiring stable component supply and long-term lifecycle support.
Supply support for ZTX855STOB 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 is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability components for automotive, industrial, and consumer markets with ISO/TS 16949 and IATF 16949 certification.
The ZTX series targets medium-power discrete switching applications, designed specifically for robust performance in harsh environments-emphasizing high-voltage capability, thermal resilience, and automotive-grade qualification.
FAQ
What is the maximum allowable collector-emitter voltage for ZTX855STOB?
The absolute maximum VCEO is 150V under open-base conditions at TA = 25°C, with typical breakdown at 180V. This rating applies to DC and repetitive pulse conditions; transient overvoltage events must remain within this limit unless clamped externally.
Is ZTX855STOB suitable for surface-mount assembly?
No-ZTX855STOB uses an E-Line package with through-hole leads (joggled or straight), designed for wave or hand soldering onto plated-through-hole PCBs. It is not a surface-mount device and lacks land pattern compatibility with SMT reflow processes.
How does the 200°C maximum junction temperature impact thermal design?
The +200°C TJ(max) allows operation in high-ambient environments (e.g., engine compartments) without immediate failure, but thermal design must still ensure steady-state TJ stays below this limit using RθJA = 110°C/W and appropriate copper area, as exceeding it causes permanent parametric shift and reduced lifetime.
Does ZTX855STOB have lead-free and halogen-free compliance documentation?
Yes-ZTX855STOB is RoHS 2 compliant (2011/65/EU), lead-free, and halogen/antimony-free ("Green"), with bromine <900ppm, chlorine <900ppm (Br+Cl <1500ppm), and antimony <1000ppm, fully documented in Diodes' Green Products policy and material declarations.
ZTX855STOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 4 A
- Voltage - Collector Emitter Breakdown (Max):
- 150 V
- Vce Saturation (Max) @ Ib, Ic:
- 260mV @ 400mA, 4A
- Current - Collector Cutoff (Max):
- 50nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 1A, 5V
- Power - Max:
- 1.2 W
- Frequency - Transition:
- 90MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX855STOB FAQ
1.How can I place an order for ZTX855STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX855STOB 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 ZTX855STOB reliable?
The price and inventory of ZTX855STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX855STOB is usually 5 days.
3.What payment methods are accepted for ZTX855STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX855STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX855STOB?
ZTX855STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX855STOB 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 ZTX855STOB?
For technical support, including ZTX855STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX855STOB requirements.
6.How does Aetrix verify that ZTX855STOB is sourced from the original manufacturer or authorized distributors?
All ZTX855STOB 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 ZTX855STOB meets industry standards.
7.What is the process for return or replacement of ZTX855STOB?
All ZTX855STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX855STOB, 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 ZTX855STOB part is unused and in its original packaging.
Return procedure for ZTX855STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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