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Diodes Incorporated ZTX455STOB
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- Part No.:
- ZTX455STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX455STOB.pdf
- Description:
- TRANS NPN 140V 1A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:5,851
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Product details
Overview
ZTX455STOB from Diodes Incorporated is an NPN silicon planar medium-power transistor designed for switching and linear amplification in industrial control, power supply regulation, and relay driver circuits. It delivers 140 VCEO, 1 A continuous collector current, 1 W power dissipation at 25°C, and a minimum hFE of 100 at IC = 150 mA / VCE = 10 V.
For engineers reviewing the ZTX455STOB datasheet, ZTX455STOB pinout, ZTX455STOB application, or ZTX455STOB equivalent, key selection factors include its 140 V breakdown rating, low VCE(sat) of 0.7 V at IC = 200 mA / IB = 20 mA, fT of 100 MHz, robust SOA up to 100 µs pulses, and TO-92 compatible lead form for through-hole PCB assembly.
Technical Context
This discrete NPN bipolar junction transistor operates with base-emitter forward biasing to control collector current flow, supporting both saturated switching (VCE(sat) ≤ 0.7 V) and active-region amplification (hFE = 100–300). Its 140 VCEO rating enables use in 120 V AC line-derived supplies and DC bus interfaces.
The device features a maximum transition frequency of 100 MHz at IC = 50 mA / VCE = 10 V and output capacitance Cobo of 15 pF at VCB = 10 V, making it suitable for medium-speed switching applications up to ~10 MHz with predictable turn-on/turn-off timing (td ≈ 100 ns, tf ≈ 900 ns).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 140 V - supports operation in 120 V AC-derived rails with margin |
| IC (continuous) | 1 A - drives relays, small solenoids, or logic-level fanout stages |
| Ptot @ 25°C | 1 W - requires heatsinking above ~500 mW ambient dissipation |
| hFE min | 100 @ IC = 150 mA, VCE = 10 V - ensures reliable base drive sizing |
| VCE(sat) | 0.7 V @ IC = 200 mA, IB = 20 mA - minimizes conduction loss in switching mode |
| fT | 100 MHz @ IC = 50 mA, VCE = 10 V - usable in audio and medium-frequency signal paths |
Pinout & Package
Package: TO-92 (E-Line compatible), epoxy-molded, through-hole mounting with standard lead spacing and orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal | Connected to ground or low-side return path; defines reference for VBE and IC control |
| Base (B) | Control input | Receives current-limited drive (typically 1/10 of IC) to saturate or bias transistor |
| Collector (C) | Current source terminal | Connected to load and positive rail; carries full switched current with voltage drop governed by VCE(sat) |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | 140 V enables direct interface with 100–120 V AC-derived DC supplies without additional voltage clamping |
| Low saturation voltage | VCE(sat) = 0.7 V at IC = 200 mA reduces power loss and thermal stress in switching duty |
| Wide operating temperature range | –55°C to +200°C junction rating supports under-hood automotive and industrial environments |
| Stable hFE across current range | hFE = 100–300 over IC = 150 mA to 1 A allows consistent gain in both linear and switching modes |
Applications
| Industrial Relay Driver | DC-DC Converter Switch |
|---|---|
Use Scenario: Driving 12 V/24 V electromagnetic relays in PLC I/O modules and motor starters. IC Role / Device Role / Timing Role: NPN switch controlling relay coil current with fast turn-on (td ≈ 100 ns) and low-loss saturation. Use Value: 140 VCEO withstands inductive kickback; 1 A rating handles typical 50–500 mA relay coils reliably. | Use Scenario: Low-side switching element in non-isolated buck converter feedback or auxiliary supply stage. IC Role / Device Role / Timing Role: Medium-speed power switch regulating output via PWM at ≤100 kHz. Use Value: 100 MHz fT and 15 pF Cobo ensure clean edge fidelity; 1 W Ptot supports intermittent 500 mW average dissipation. |
| Linear Voltage Regulator Pass Element | Audio Preamp Stage |
Use Scenario: Series pass transistor in fixed-output linear regulators for instrumentation power rails. IC Role / Device Role / Timing Role: Active-mode current amplifier delivering stable output current with thermal foldback. Use Value: hFE ≥ 100 ensures predictable base drive; –55°C to +200°C Tj range accommodates enclosure heating. | Use Scenario: First-stage small-signal amplifier in microphone preamplifiers or sensor signal conditioning. IC Role / Device Role / Timing Role: Low-noise, medium-gain BJT providing 20–30 dB voltage gain in common-emitter configuration. Use Value: 100 MHz fT supports audio bandwidth up to 20 kHz with flat response; low VCE(sat) improves headroom. |
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 |
|---|---|---|---|
| ZTX454STOB | Lower VCEO (120 V) and VCBO (140 V); otherwise identical pinout, hFE, and package | Not suitable for 120 V AC-derived rails requiring >120 V blocking margin | Select only where system max VCE remains ≤110 V with safety margin |
| BC548B | Lower VCEO (30 V), lower IC (100 mA), TO-92 package but not E-line pin-compatible | Limited to low-voltage logic interfacing and signal amplification, not power switching | Use only in sub-30 V, <100 mA signal paths; not a functional replacement |
Compared with ZTX455STOB, ZTX454STOB trades 20 V blocking capability for identical cost and footprint, while BC548B serves entirely different low-voltage signal roles-neither offers drop-in compatibility, and selection must align with voltage, current, and SOA requirements.
Availability
ZTX455STOB is available at Aetrix Electronics and suitable for industrial relay drivers, DC-DC converter switches, linear regulator pass elements, and audio preamp stages requiring stable component supply and long-term manufacturability.
Supply support for ZTX455STOB 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for industrial, computing, consumer, and communications markets.
ZTX455STOB belongs to the ZTX series of high-voltage, medium-power bipolar transistors engineered for reliability in industrial control, power conversion, and ruggedized analog signal paths.
FAQ
Is ZTX455STOB RoHS compliant?
Yes, ZTX455STOB meets RoHS Directive 2011/65/EU requirements. Diodes Incorporated confirms lead-free termination, halogen-free molding compound, and full compliance documentation available upon request for production traceability and environmental certification.
What is the maximum safe operating area (SOA) for pulsed operation?
The SOA curve shows single-pulse capability up to 100 V × 1 A for 100 µs at Tamb = 25°C. Derating is required per the published SOA graph: at 10 ms pulse width, max VCE drops to ~40 V at 1 A; continuous DC operation is limited to 1 W with adequate heatsinking.
Can ZTX455STOB be used in avalanche mode?
No-ZTX455STOB is not rated or characterized for controlled avalanche operation. Its VCEO(sus) = 140 V is specified under pulsed conditions with IC = 10 mA, and no energy-rated avalanche specs (EAS) are provided in the datasheet or application notes.
Does ZTX455STOB have a built-in base-emitter resistor?
No, ZTX455STOB is a standard three-terminal NPN transistor with no integrated resistors. External base biasing components-including current-limiting resistors and optional pull-down resistors-must be added per circuit requirements and switching speed targets.
ZTX455STOB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 140 V
- Vce Saturation (Max) @ Ib, Ic:
- 700mV @ 15mA, 150mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 100 @ 150mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 100MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX455STOB FAQ
1.How can I place an order for ZTX455STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX455STOB 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 ZTX455STOB reliable?
The price and inventory of ZTX455STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX455STOB is usually 5 days.
3.What payment methods are accepted for ZTX455STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX455STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX455STOB?
ZTX455STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX455STOB 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 ZTX455STOB?
For technical support, including ZTX455STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX455STOB requirements.
6.How does Aetrix verify that ZTX455STOB is sourced from the original manufacturer or authorized distributors?
All ZTX455STOB 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 ZTX455STOB meets industry standards.
7.What is the process for return or replacement of ZTX455STOB?
All ZTX455STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX455STOB, 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 ZTX455STOB part is unused and in its original packaging.
Return procedure for ZTX455STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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