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Diodes Incorporated ZTX553STOB
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- Part No.:
- ZTX553STOB
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX553STOB.pdf
- Description:
- TRANS PNP 100V 1A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:6,066
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Product details
Overview
ZTX553STOB from Zetex Semiconductors (now Diodes Incorporated) is a PNP silicon planar medium-power bipolar junction transistor designed for linear amplification and switching in high-voltage, moderate-current applications. It features VCEO = –100 V, IC = –1 A continuous, Ptot = 1 W at 25°C, and hFE = 40–200 (IC = –150 mA to –1 A), commonly used in industrial power supply regulation and relay driver stages.
For engineers reviewing the ZTX553STOB datasheet, ZTX553STOB pinout, ZTX553STOB application, or ZTX553STOB equivalent, key selection criteria include verified VCEO rating, saturation voltage under defined IB/IC conditions, thermal derating slope (5.7 mW/°C), fT = 150 MHz, and TO-92 package compatibility with legacy E-Line footprints.
Technical Context
The ZTX553STOB operates as a medium-power PNP BJT optimized for stable DC gain and fast switching in inductive load control. Its –100 V VCEO and –120 V VCBO support operation in 80 V rail systems with margin, while the 150 MHz fT enables use in low-frequency RF amplifiers and pulse-width modulated (PWM) gate drivers up to ~10 MHz.
Thermal design relies on its 5.7 mW/°C derating above 25°C ambient and 200°C max junction temperature. The device exhibits VCE(sat) = –0.25 V at IC = –150 mA / IB = –15 mA and VBE(sat) = –1.1 V under identical conditions - critical for minimizing conduction loss in series-pass or high-side switch configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | –100 V: Maximum safe collector-emitter voltage before avalanche breakdown in common-emitter configuration. |
| IC (continuous) | –1 A: Continuous DC collector current capability at Tamb ≤ 25°C with adequate heatsinking. |
| Ptot @ 25°C | 1 W: Total power dissipation limit at 25°C ambient; derates linearly by 5.7 mW/°C above that temperature. |
| hFE | 40–200: DC current gain range across IC = –150 mA to –1 A, defining base drive requirements for saturation. |
| fT | 150 MHz: Transition frequency at IC = –50 mA, VCE = –10 V, indicating usable bandwidth for signal amplification or fast switching. |
| VCE(sat) | –0.25 V @ IC = –150 mA, IB = –15 mA: Low saturation voltage ensures minimal power loss in switching applications. |
| VCBO | –120 V: Collector-base breakdown voltage, supporting robust operation in high-impedance collector circuits. |
Pinout & Package
Package: TO-92 (E-Line compatible), molded plastic case with 3 leads; standard lead configuration (flat side facing viewer, leads down): Emitter (left), Base (center), Collector (right).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current sink terminal for PNP operation | Connected to most positive rail in high-side switch or emitter-follower configurations; sets reference for VBE biasing. |
| Base (B) | Control input for minority-carrier injection | Receives negative current to turn on; requires –15 mA for full saturation at –150 mA collector load. |
| Collector (C) | Current source terminal for PNP operation | Typically connected to load and supply rail; must withstand –100 V reverse bias relative to emitter during off-state. |
Key Features
| Feature | Design Value |
|---|---|
| High VCEO rating | –100 V enables use in 72 V telecom supplies and 80 V industrial bus interfaces without additional clamping. |
| Low VCE(sat) | –0.25 V at rated IC/IB ensures <250 mW conduction loss per transistor in switching mode. |
| Wide hFE range | 40–200 supports both precision biasing (high-hFE units) and robust overdrive (low-hFE units) across production lots. |
| 150 MHz fT | Supports clean square-wave switching up to 10 MHz with minimal rise/fall time degradation in gate-driving applications. |
| TO-92 compatibility | E-Line footprint allows drop-in replacement of legacy ZTX552/ZTX553 variants without PCB redesign. |
Applications
| Industrial Power Supply Regulation | Relay and Solenoid Driver |
|---|---|
Use Scenario: Linear pass transistor in adjustable 0–60 V, 1 A bench power supply output stage. IC Role / Device Role / Timing Role: PNP series pass element controlling output voltage via feedback loop; operates in active region with continuous DC bias. Use Value: VCEO = –100 V provides 40 V headroom above 60 V output, ensuring safe operation during transient overvoltage events. | Use Scenario: High-side switch driving 24 V DC relay coil (80 Ω, 300 mA) in PLC I/O module. IC Role / Device Role / Timing Role: Saturated PNP switch turning coil on/off; base driven by microcontroller GPIO through current-limiting resistor. Use Value: VCE(sat) = –0.25 V limits coil power loss to <75 mW, reducing thermal stress and enabling compact PCB layout. |
| DC Motor Speed Control | Legacy Audio Amplifier Stage |
Use Scenario: PWM-controlled H-bridge upper-arm switch for 12–24 V brushed DC motor (max 800 mA). IC Role / Device Role / Timing Role: High-side switching element toggled at 1–5 kHz; operated in saturation/cutoff with fast turn-on/turn-off. Use Value: fT = 150 MHz ensures <100 ns rise/fall times, minimizing shoot-through risk and conduction overlap loss. | Use Scenario: Complementary PNP driver in Class AB audio preamp output stage (±15 V rails). IC Role / Device Role / Timing Role: Linear amplifier biased in active region; delivers low-distortion current to 10 kΩ load. Use Value: hFE = 40–200 allows stable DC bias setting across unit-to-unit variation, maintaining consistent quiescent current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar PNP medium-power transistor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZTX552STOB | VCEO = –80 V, VCBO = –100 V, hFE min = 40 at IC = –150 mA | Limited to ≤60 V systems; lower voltage margin reduces safety margin in surge-prone environments. | Select when cost sensitivity outweighs need for 100 V rating and system voltage remains ≤60 V. |
| MJD2955G | TO-220 package, IC = –10 A, VCEO = –60 V, Ptot = 75 W | Higher power handling but larger footprint and different thermal interface; not pin-compatible. | Choose for high-current (>2 A), high-power (>5 W) applications where TO-92 thermal limits are exceeded. |
Compared with ZTX553STOB, ZTX552STOB trades 20 V VCEO margin for identical gain and package, while MJD2955G offers tenfold current capacity at the cost of board space and thermal management complexity - making ZTX553STOB optimal for space-constrained 1 A, 100 V switching or linear roles.
Availability
ZTX553STOB is available at Aetrix Electronics and suitable for industrial power supply regulation, relay/solenoid driver circuits, DC motor speed control, and legacy audio amplifier stages requiring stable component supply and long-term obsolescence mitigation.
Supply support for ZTX553STOB 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 Semiconductors, acquired by Diodes Incorporated in 2008, specialized in high-performance discrete semiconductors with emphasis on efficiency, reliability, and legacy compatibility.
The ZTX55x series was developed for industrial and telecom applications demanding rugged PNP transistors with guaranteed high-voltage operation and TO-92 footprint consistency across generations.
FAQ
What is the maximum safe operating temperature for ZTX553STOB?
The ZTX553STOB has a specified junction temperature range of –55°C to +200°C. Its absolute maximum storage and operating temperature is +200°C, but practical continuous operation should remain below 150°C to ensure long-term reliability and avoid accelerated parameter drift. Thermal derating begins at 25°C ambient, decreasing power dissipation by 5.7 mW per °C rise.
Can ZTX553STOB be used in parallel for higher current handling?
No - ZTX553STOB is not characterized or recommended for paralleling due to inherent hFE and VBE(on) mismatches between units, which cause current imbalance and thermal runaway. For >1 A applications, select a single higher-rated device like MJD2955G or implement external emitter resistors with careful thermal coupling, though this is not supported by manufacturer data.
Is ZTX553STOB RoHS compliant and halogen-free?
Yes - as part of Diodes Incorporated's post-acquisition product stewardship, ZTX553STOB meets RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. The TO-92 package uses lead-free matte tin plating and compliant molding compound; full compliance documentation is available under Diodes Inc. part number ZTX553STOBQ.
Does ZTX553STOB require a base resistor in switching applications?
Yes - a series base resistor is mandatory to limit IB and ensure saturation without exceeding the –2 A peak pulse current rating. For IC = –150 mA, IB = –15 mA is required; using a 1 kΩ resistor with –15 V drive yields –15 mA, satisfying the condition. Omitting it risks base-emitter junction failure or incomplete turn-on leading to excessive power dissipation.
ZTX553STOB 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:
- PNP
- Current - Collector (Ic) (Max):
- 1 A
- Voltage - Collector Emitter Breakdown (Max):
- 100 V
- Vce Saturation (Max) @ Ib, Ic:
- 250mV @ 15mA, 150mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 40 @ 150mA, 10V
- Power - Max:
- 1 W
- Frequency - Transition:
- 150MHz
- Operating Temperature:
- -55°C ~ 200°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- E-Line (TO-92 compatible)
ZTX553STOB FAQ
1.How can I place an order for ZTX553STOB through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX553STOB 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 ZTX553STOB reliable?
The price and inventory of ZTX553STOB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX553STOB is usually 5 days.
3.What payment methods are accepted for ZTX553STOB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX553STOB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX553STOB?
ZTX553STOB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX553STOB 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 ZTX553STOB?
For technical support, including ZTX553STOB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX553STOB requirements.
6.How does Aetrix verify that ZTX553STOB is sourced from the original manufacturer or authorized distributors?
All ZTX553STOB 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 ZTX553STOB meets industry standards.
7.What is the process for return or replacement of ZTX553STOB?
All ZTX553STOB units undergo pre-shipment inspection (PSI). If there is an issue with ZTX553STOB, 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 ZTX553STOB part is unused and in its original packaging.
Return procedure for ZTX553STOB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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