My Inquiry
My Account
Diodes Incorporated ZTX551STOA
,TO-226_straightlead.jpg)
- Part No.:
- ZTX551STOA
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Bipolar Transistors
- Package:
- E-Line-3, Formed Leads
- Datasheet:
-
ZTX551STOA.pdf
- Description:
- TRANS PNP 60V 1A E-LINE
- Quantity:
- Payment:
- Shipping:
Inventory:4,493
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ZTX551STOA from Diodes Incorporated is an 80V PNP medium-power transistor in E-Line (TO-92 compatible) package, rated for -1A continuous collector current, -65V VCEO, and 1W power dissipation at +25°C ambient. It operates up to +200°C junction temperature and is used in DC-DC converters, LCD backlight drivers, and emergency lighting circuits where high-voltage PNP switching with robust thermal capability is required.
For engineers reviewing the ZTX551STOA datasheet, ZTX551STOA pinout, ZTX551STOA application, or ZTX551STOA equivalent, key selection criteria include verified BVCEO = -65V, hFE = 50–150 at IC = -150mA, VCE(sat) ≤ -350mV, fT = 150MHz, and E-Line mechanical compatibility with TO-92 footprint constraints.
Technical Context
This PNP bipolar junction transistor delivers high-voltage blocking (BVCEO = -65V) and stable gain across operating current range, with hFE specified at both IC = -150mA (min 50) and IC = -1A (min 10). Its 150MHz fT supports moderate-frequency switching in DC-DC topologies.
Thermal design is enabled by dual power dissipation ratings: 1.5W under optimized PCB mounting (RθJA = 116°C/W), and 1W under standard through-hole layout (RθJA = 175°C/W), with RθJL = 63.75°C/W confirming effective lead-to-board heat conduction.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCEO | -65V - Maximum safe collector-emitter voltage before breakdown under open-base condition |
| IC (cont.) | -1A - Continuous DC collector current rating defining steady-state power stage capacity |
| PD | 1W - Max power dissipation on standard PCB layout; requires thermal derating above +25°C ambient |
| hFE | 50–150 - DC current gain range at IC = -150mA/VCE = -10V, critical for base drive sizing |
| fT | 150MHz - Transition frequency indicating usable bandwidth for linear amplification or switching |
| TJ max | +200°C - Maximum junction temperature enabling operation in high-ambient industrial environments |
| VCE(sat) | ≤ -350mV - Low saturation voltage at IC = -150mA/IB = -15mA, minimizing conduction loss |
Pinout & Package
E-Line package is a molded plastic TO-92 compatible outline with matte tin-plated leads, UL 94V-0 rated, weighing 0.159g. Pin configuration is fixed: Emitter (E), Collector (C), Base (B) - viewed from flat face with marking "ZTX551", left-to-right order is E-C-B.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Emitter (E) | Current source terminal for PNP device | Connected to higher potential rail; carries full load current in common-emitter switch configuration |
| Collector (C) | Current sink terminal | Typically tied to load and ground-return path; voltage swing referenced to emitter |
| Base (B) | Control input | Receives negative drive current to turn on; requires series resistor to limit IB per hFE and VBE(sat) |
Key Features
| Feature | Design Value |
|---|---|
| High-voltage PNP structure | BVCEO = -65V enables use in 48V and higher DC bus switching without cascading |
| High-temperature operation | TJ rating up to +200°C supports under-hood automotive and enclosed industrial designs |
| Lead-free & green compliance | Fully RoHS 3 compliant with <900ppm Br/Cl and <1000ppm Sb - meets global environmental mandates |
| ESD robustness | HBM rating of 4kV ensures handling survivability during manual assembly and board rework |
Applications
| LCD Backlight Converters | Emergency Lighting Drivers |
|---|---|
Use Scenario: Step-up DC-DC converter driving CCFL or LED strings in portable displays. IC Role / Device Role / Timing Role: PNP switch in boost converter's main power stage, controlling energy transfer into output inductor. Use Value: -65V VCEO safely handles reflected flyback voltages; low VCE(sat) reduces conduction loss at 150–500mA loads. | Use Scenario: Constant-current driver for LED arrays in battery-backed exit signs and safety lighting. IC Role / Device Role / Timing Role: Linear or PWM-controlled PNP pass element regulating LED current from 12–24V supply. Use Value: +200°C TJ rating ensures reliability in sealed enclosures; hFE stability supports accurate analog current control. |
| Industrial DC-DC Modules | Automotive Auxiliary Power Supplies |
Use Scenario: Isolated or non-isolated buck/boost regulator supplying 5V/3.3V rails in PLCs and sensors. IC Role / Device Role / Timing Role: High-side PNP switch in quasi-resonant or hard-switched topology. Use Value: 150MHz fT supports >100kHz switching; E-Line package allows manual repair and legacy board compatibility. | Use Scenario: Voltage translator and load switch in 12V/24V vehicle subsystems (e.g., HVAC controls, infotainment). IC Role / Device Role / Timing Role: PNP-based level shifter or reverse-polarity protection switch. Use Value: -80V VCBO withstands load-dump transients; AEC-Q101 qualified variants available for automotive-grade sourcing. |
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 |
|---|---|---|---|
| MJD2955G | TO-220 package, higher IC = -10A, lower fT = 30kHz, VCEO = -60V | Requires heatsink; unsuitable for space-constrained E-Line footprints | Select when higher current and thermal mass are prioritized over size and frequency |
| ZTX450 | E-Line package, lower VCEO = -45V, same IC = -1A, hFE = 100–300 | Not suitable for >45V bus applications; better gain linearity at low currents | Select only if system voltage remains ≤40V and higher hFE at light loads is needed |
Compared with MJD2955G and ZTX450, ZTX551STOA uniquely balances high-voltage capability (-65V), compact E-Line form factor, and 150MHz bandwidth-making it optimal for space-limited, medium-frequency, medium-power PNP switching where thermal management is constrained.
Availability
ZTX551STOA is available at Aetrix Electronics and suitable for LCD backlight converters, emergency lighting drivers, and industrial DC-DC modules requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.
Supply support for ZTX551STOA 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, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and North America.
ZTX551STOA belongs to Diodes' general-purpose bipolar transistor product line, engineered for cost-sensitive, high-reliability power switching in industrial, consumer, and automotive auxiliary systems.
FAQ
What is the maximum allowable collector-emitter voltage for ZTX551STOA?
ZTX551STOA has a guaranteed minimum BVCEO of -65V at IC = -10mA. This rating applies under open-base conditions and defines the absolute maximum DC voltage that can be sustained between collector and emitter without breakdown. Operation above this voltage risks irreversible device failure.
Is ZTX551STOA suitable for surface-mount assembly?
No - ZTX551STOA uses the through-hole E-Line package (TO-92 compatible) with straight or joggled leads. It is not designed for SMT reflow or pick-and-place. For SMT alternatives, consider Diodes' DXT551 (SOT-23) or similar PNP devices explicitly qualified for surface-mount processes.
How does thermal resistance differ between mounting configurations?
ZTX551STOA specifies two RθJA values: 116°C/W for optimized mounting (2.5mm lead length, 25mm×25mm copper pad), and 175°C/W for standard through-hole layout (12mm lead length, minimal pad). The 59°C/W difference reflects real-world PCB thermal design impact on safe operating area.
Does ZTX551STOA meet automotive qualification standards?
ZTX551STOA itself is not AEC-Q101 qualified, but Diodes offers automotive-grade equivalents (e.g., ZTX551Q) manufactured in IATF 16949 facilities and PPAP-capable. These variants undergo extended stress testing and change control - required for under-hood or safety-critical automotive use.
ZTX551STOA 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):
- 60 V
- Vce Saturation (Max) @ Ib, Ic:
- 350mV @ 15mA, 150mA
- Current - Collector Cutoff (Max):
- 100nA (ICBO)
- DC Current Gain (hFE) (Min) @ Ic, Vce:
- 50 @ 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)
ZTX551STOA FAQ
1.How can I place an order for ZTX551STOA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZTX551STOA 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 ZTX551STOA reliable?
The price and inventory of ZTX551STOA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZTX551STOA is usually 5 days.
3.What payment methods are accepted for ZTX551STOA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZTX551STOA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZTX551STOA?
ZTX551STOA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZTX551STOA 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 ZTX551STOA?
For technical support, including ZTX551STOA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZTX551STOA requirements.
6.How does Aetrix verify that ZTX551STOA is sourced from the original manufacturer or authorized distributors?
All ZTX551STOA 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 ZTX551STOA meets industry standards.
7.What is the process for return or replacement of ZTX551STOA?
All ZTX551STOA units undergo pre-shipment inspection (PSI). If there is an issue with ZTX551STOA, 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 ZTX551STOA part is unused and in its original packaging.
Return procedure for ZTX551STOA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ZTX551STOA Tags
-
MMBT3906LT1G
onsemi
-
MMBT3904-7-F
Diodes Incorporated
-
MMBT3904LT1G
onsemi
-
MMBT3906-7-F
Diodes Incorporated
-
MMBT3904-TP
Micro Commercial Co
-
MMBT2222A-7-F
Diodes Incorporated
-
BC846BLT1G
onsemi
-
BC847B,215
Nexperia USA Inc.
-
SMMBT3904LT1G
onsemi
-
MMBT2222A-TP
Micro Commercial Co
-
MMBTA06LT1G
onsemi
-
MMBT2222ALT1G
onsemi
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
