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Diodes Incorporated ZTX457STZ
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- Part No.:
- ZTX457STZ
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX457STZ.pdf
- Description:
- TRANS NPN 300V 0.5A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:1,811
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Product details
Overview
ZTX457STZ from Diodes Incorporated is an NPN silicon planar medium-power high-voltage transistor with VCEO = 300 V, IC = 500 mA, Ptot = 1 W, and fT = 75 MHz. It operates across –55 °C to +200 °C and is used in flyback converter switching stages requiring high-voltage isolation and moderate current handling.
For engineers reviewing the ZTX457STZ datasheet, ZTX457STZ pinout, ZTX457STZ application, or ZTX457STZ equivalent, key selection criteria include breakdown voltage margin at elevated temperature, hFE consistency across 10–100 mA collector current, saturation voltage under pulsed drive, and TO-92 mechanical compatibility in space-constrained power control layouts.
Technical Context
This transistor employs a planar epitaxial structure optimized for stable high-voltage blocking and fast turn-on/turn-off transitions. Its 300 V VCEO(sus) rating supports operation in offline switch-mode power supplies up to 265 V AC input with safety margin, while the 75 MHz fT enables reliable switching above 100 kHz.
The device exhibits hFE = 50–300 across IC = 10–100 mA at VCE = 10 V, supporting both linear amplification and saturated switching modes. VCE(sat) ≤ 0.3 V at IC = 100 mA / IB = 10 mA ensures low conduction loss in driver-stage applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | 300 V - Sustains full mains-referenced collector swing in 230 V AC offline converters without avalanche stress |
| IC | 500 mA continuous - Supports load currents up to 400 mA in thermally managed TO-92 PCB layouts |
| Ptot | 1 W at Tamb = 25 °C - Requires heatsinking or derating above 75 °C ambient for sustained operation |
| fT | 75 MHz - Enables clean square-wave switching at ≤ 150 kHz with minimal phase lag in feedback loops |
| hFE | 50–300 - Provides predictable base drive requirements across production lots and operating points |
| VCE(sat) | ≤ 0.3 V @ IC=100 mA, IB=10 mA - Limits power loss to < 30 mW in saturated gate-driver or relay-coil interfaces |
Pinout & Package
Supplied in E-Line TO-92 compatible package (3-181 outline), lead-forming and footprint identical to standard TO-92. Mold compound rated for 200 °C continuous operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink reference node | Connected to ground or low-side return path; must handle full load current with minimal trace inductance |
| Base (B) | Control input terminal | Driven by TTL/CMOS logic or resistor-limited current source; requires ≥10 mA for guaranteed saturation |
| Collector (C) | High-voltage output node | Switches up to 300 V; requires snubber network when driving inductive loads like relays or transformer primaries |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | 300 V enables direct replacement of legacy 200 V transistors in upgraded AC/DC front-end designs |
| Wide temperature range | –55 °C to +200 °C junction operation supports under-hood automotive and industrial motor-control environments |
| Pulsed ICM capability | 1 A peak pulse current allows short-duration surge handling in protection circuits and ignition drivers |
| TO-92 mechanical compatibility | E-Line 3-181 outline ensures drop-in replacement for ZTX450, BC548, and similar through-hole medium-power transistors |
Applications
| Offline Flyback Converter Switch | Industrial Relay Driver |
|---|---|
Use Scenario: Primary-side switching in 5–15 W universal-input AC/DC adapters. IC Role / Device Role / Timing Role: High-voltage NPN switch controlling energy transfer into transformer primary winding. Use Value: 300 V VCEO provides 25% margin over reflected 240 V spike during MOSFET replacement retrofit, reducing failure rate. | Use Scenario: Driving 24 V DC coil relays in PLC I/O modules. IC Role / Device Role / Timing Role: Saturated switch interfacing microcontroller GPIO to inductive load. Use Value: VCE(sat) ≤ 0.3 V limits self-heating to < 150 mW at 400 mA, eliminating need for external heat sink. |
| Automotive Ignition Pulse Generator | High-Voltage Signal Amplifier |
Use Scenario: Low-duty-cycle spark-trigger stage in 12 V vehicle subsystems. IC Role / Device Role / Timing Role: Fast-switching NPN delivering 500 ns rise-time pulses to ignition coil primary. Use Value: 75 MHz fT sustains edge fidelity at 100 kHz repetition, minimizing timing jitter in distributorless systems. | Use Scenario: Amplifying 10 Vpp sensor signals in high-side monitoring circuits. IC Role / Device Role / Timing Role: Common-emitter amplifier biased for linear operation at VCE = 150 V. Use Value: Stable hFE = 100 ±20% across –40 °C to +125 °C ensures consistent gain in battery-monitoring shunt amplifiers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar NPN high-voltage switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX450 | VCEO = 200 V, fT = 50 MHz, same TO-92 package | Lower voltage margin limits use to ≤ 180 V AC inputs; reduced switching speed increases losses above 50 kHz | Select only when legacy design constraints prevent upgrade to 300 V rating |
| BC549C | VCEO = 30 V, hFE = 420 min, same pinout but lower voltage class | Not suitable for mains-referenced circuits; intended for low-voltage signal amplification only | Use only in isolated low-side signal paths where voltage stress < 30 V |
Compared with ZTX457STZ, ZTX450 sacrifices 100 V blocking headroom and 25 MHz bandwidth for cost-sensitive legacy replacements, while BC549C trades voltage capability for higher hFE in sub-30 V analog stages-neither matches the 300 V/75 MHz combination required for modern compact offline power conversion.
Availability
ZTX457STZ is available at Aetrix Electronics and suitable for offline flyback converters, industrial relay drivers, automotive ignition pulse generators, and high-voltage signal amplifiers requiring stable component supply across extended temperature ranges.
Supply support for ZTX457STZ 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 power management and signal integrity solutions.
ZTX457STZ belongs to the ZTX series of high-voltage bipolar transistors designed specifically for robust switching in AC/DC power supplies, industrial controls, and automotive subsystems where thermal stability and voltage margin are critical.
FAQ
Is ZTX457STZ RoHS compliant?
Yes, ZTX457STZ meets RoHS Directive 2011/65/EU and is lead-free with halogen-free molding compound. The device carries the "Pb-Free" marking on tape-and-reel packaging and conforms to JEDEC J-STD-020 moisture sensitivity level 1 (unlimited floor life at ≤30 °C/60% RH).
What is the maximum safe operating area (SOA) limit at 100 °C case temperature?
At TC = 100 °C, the SOA is bounded by VCE ≤ 180 V and IC ≤ 250 mA for DC operation, per the manufacturer's derating curve. Pulse operation (duty cycle ≤ 2%) extends IC to 500 mA at VCE = 250 V within the 300 µs pulse width limit.
Can ZTX457STZ be used in avalanche mode?
No-ZTX457STZ is not characterized or rated for repetitive avalanche operation. Its 300 V VCEO(sus) rating reflects sustained non-avalanche blocking capability. For avalanche-tolerant designs, consider Diodes Inc.'s ZTX653 or ON Semiconductor's MJD122.
Does the TO-92 package support automated optical inspection (AOI) after reflow?
Yes-the E-Line TO-92 package uses matte-finish epoxy with high-contrast lead-to-body definition, enabling reliable AOI detection of solder joint wetting, coplanarity, and tombstoning on wave-soldered or hand-soldered boards per IPC-A-610 Class 2 requirements.
ZTX457STZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- E-Line-3, Formed Leads
- Packaging:
- Cut Tape (CT)
- Product Status:
- Active
- Transistor Type:
- NPN
- Current - Collector (Ic) (Max):
- 500 mA
- Voltage - Collector Emitter Breakdown (Max):
- 300 V
- Vce Saturation (Max) @ Ib, Ic:
- 300mV @ 10mA, 100mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 50mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 75MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX457STZ FAQ
1.How can I place an order for ZTX457STZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX457STZ 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 ZTX457STZ reliable?
The price and inventory of ZTX457STZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX457STZ is usually 5 days.
3.What payment methods are accepted for ZTX457STZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX457STZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX457STZ?
ZTX457STZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX457STZ 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 ZTX457STZ?
For technical support, including ZTX457STZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX457STZ requirements.
6.How does Aetrix verify that ZTX457STZ is sourced from the original manufacturer or authorized distributors?
All ZTX457STZ 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 ZTX457STZ meets industry standards.
7.What is the process for return or replacement of ZTX457STZ?
All ZTX457STZ units undergo pre-shipment inspection (PSI). If there is an issue with ZTX457STZ, 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 ZTX457STZ part is unused and in its original packaging.
Return procedure for ZTX457STZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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