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onsemi SZMMBZ5250BLT1G
- Part No.:
- SZMMBZ5250BLT1G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
SZMMBZ5250BLT1G.pdf
- Description:
- DIODE ZENER 20V 225MW SOT23-3
- Quantity:
- Payment:
- Shipping:
Inventory:7,920
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Product details
Overview
SZMMBZ5250BLT1G from onsemi is a 20 V ±5% Zener diode in SOT-23 package, rated for 225 mW power dissipation on FR-5 board, with 6.2 mA test current, 25 Ω dynamic impedance at IZT, and 0.1 μA reverse leakage at 15 V. It provides precision voltage regulation in space-constrained portable power rails.
For engineers reviewing the SZMMBZ5250BLT1G datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, thermal derating behavior, AEC-Q101 qualification status, and automotive-grade marking context - all critical for BOM validation and high-reliability design-in.
Technical Context
This device operates as a two-terminal shunt voltage regulator, maintaining stable output voltage across variable load and input conditions via controlled reverse breakdown. Its 20 V nominal Zener voltage exhibits a positive temperature coefficient near zero crossing (~0.03%/°C), minimizing drift over −65°C to +150°C junction range.
The SOT-23 (Case 318) package features a defined anode-cathode pinout (Pin 1 = Anode, Pin 2 = NC, Pin 3 = Cathode), optimized for automated placement and reflow compatibility up to 260°C for 10 seconds. ESD robustness exceeds 16 kV HBM (Class 3), supporting handling in high-volume manufacturing environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 19.0–21.0 V @ IZT = 6.2 mA - defines regulated output voltage tolerance band under standard test condition |
| Power Dissipation (PD) | 225 mW @ TA = 25°C on FR-5 board - sets maximum continuous power before thermal derating begins |
| Zener Impedance (ZZT) | 25 Ω @ IZT = 6.2 mA - determines output voltage variation under load transients (ΔV = Iload × ZZT) |
| Reverse Leakage (IR) | 0.1 μA @ VR = 15 V - ensures minimal quiescent current draw below regulation threshold |
| Junction Temp Range | −65°C to +150°C - supports operation in automotive under-hood and industrial ambient environments |
| ESD Rating | Class 3 (>16 kV HBM) - enables direct handling without additional ESD protection circuitry |
| Thermal Resistance (RJA) | 556°C/W on FR-5 board - used to calculate junction temperature rise (TJ = TA + PD × RJA) |
Pinout & Package
SOT-23 (TO-236) surface-mount package, 2.90 mm × 1.30 mm × 1.00 mm body size, void-free thermosetting plastic case with corrosion-resistant finish and UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | Anode | Connected to lower-potential side of regulated rail; reverse-biased during regulation |
| Pin 2 | No Connection | Internally unconnected; must remain floating - no PCB trace or pad required |
| Pin 3 | Cathode | Connected to higher-potential side (e.g., supply rail); polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 Qualified | Validated for automotive applications including engine control modules and ADAS power supervision |
| SZ Prefix Marking | Indicates unique site/control change tracking and PPAP capability per automotive quality requirements |
| Pb-Free / RoHS Compliant | Meets EU RoHS Directive 2011/65/EU and halogen-free/BFR-free material specifications |
| 225 mW FR-5 Rating | Enables compact voltage clamping in handheld devices without external heat sinking |
| 16 kV HBM ESD Robustness | Eliminates need for discrete ESD protection in low-energy signal/power monitoring paths |
Applications
| Automotive Power Supervision | Portable Device Voltage Reference |
|---|---|
|
Use Scenario: Monitoring 24 V battery rail in body control module to detect undervoltage/overvoltage faults. IC Role / Device Role / Timing Role: Shunt reference element providing stable 20 V threshold for comparator input. Use Value: Enables accurate fault detection within ±5% tolerance across temperature, leveraging AEC-Q101 reliability and 150°C max junction rating. |
Use Scenario: Providing precise bias voltage for ADC reference buffer in Bluetooth earbud charging case. IC Role / Device Role / Timing Role: Low-power Zener reference replacing larger 3-pin IC regulator to save PCB area. Use Value: Delivers 20 V reference with only 0.1 μA leakage at 15 V, extending battery life while fitting 1.3 mm wide SOT-23 footprint. |
| Industrial Sensor Signal Conditioning | USB-C PD Protection Clamp |
|
Use Scenario: Clamping transient spikes on 24 V analog sensor supply line in factory automation PLC I/O module. IC Role / Device Role / Timing Role: Fast-response overvoltage clamp limiting rail excursions to ≤21 V during EFT events. Use Value: 25 Ω ZZT ensures <250 mV deviation at 10 mA surge, meeting IEC 61000-4-4 Level 3 immunity requirements. |
Use Scenario: Protecting USB-C CC line from 20 V PD negotiation voltage overshoots during hot-plug events. IC Role / Device Role / Timing Role: Bidirectional clamp (anode-to-ground, cathode-to-rail) limiting CC line excursion to ±21 V. Use Value: 225 mW rating handles short-duration PD transients; SOT-23 allows placement adjacent to USB-C connector without layout compromise. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C20LT1G | 20 V ±5%, 300 mW rating on FR-4, 30 Ω ZZT, non-automotive grade | Lacks AEC-Q101 qualification and SZ-prefix traceability; suitable for commercial portable electronics only | Select when cost sensitivity outweighs automotive compliance and higher power margin is needed |
| SZBZX84C20LT1G | 20 V ±5%, 300 mW, AEC-Q101 qualified, same SOT-23 package, 30 Ω ZZT | Higher power rating but slightly higher dynamic impedance; identical automotive qualification scope | Choose for designs requiring >225 mW headroom while retaining automotive traceability and PPAP support |
Compared with SZMMBZ5250BLT1G, BZX84-C20LT1G offers higher power but no automotive qualification, whereas SZBZX84C20LT1G matches AEC-Q101 compliance while delivering 33% more dissipation - making it preferable where thermal margin or long-term automotive field reliability is prioritized over minimal footprint.
Availability
SZMMBZ5250BLT1G is available at Aetrix Electronics and suitable for automotive power supervision, portable device voltage reference, industrial sensor conditioning, and USB-C PD protection requiring stable component supply with full traceability and lifecycle management.
Supply support for SZMMBZ5250BLT1G 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
onsemi is a global semiconductor supplier delivering energy-efficient, intelligent power and sensing solutions for automotive, industrial, cloud, medical, and IoT applications.
SZMMBZ5250BLT1G belongs to the SZMMBZ52xxBLT1G automotive Zener series, engineered specifically for AEC-Q101 compliance, PPAP readiness, and high-density board integration in harsh-environment electronics.
FAQ
What is the Zener voltage tolerance of SZMMBZ5250BLT1G?
The SZMMBZ5250BLT1G has a nominal Zener voltage of 20 V with a guaranteed tolerance of ±5%, meaning its actual reverse breakdown voltage falls between 19.0 V and 21.0 V when tested at IZT = 6.2 mA and TA = 25°C. This tight tolerance supports accurate voltage thresholding in safety-critical automotive and industrial monitoring circuits where SZMMBZ5250BLT1G is deployed.
Is SZMMBZ5250BLT1G suitable for automotive applications?
Yes, SZMMBZ5250BLT1G is AEC-Q101 qualified and PPAP capable, with the "SZ" prefix indicating automotive-specific process controls, site traceability, and extended reliability testing. It operates across −65°C to +150°C junction temperature and meets Class 3 HBM ESD requirements (>16 kV), making SZMMBZ5250BLT1G appropriate for under-hood and ADAS power supervision systems.
What is the thermal derating behavior of SZMMBZ5250BLT1G above 25°C?
SZMMBZ5250BLT1G derates linearly at 1.8 mW/°C above 25°C ambient temperature when mounted on FR-5 board, reducing its maximum allowable power dissipation from 225 mW at 25°C to zero at approximately 161°C. This derating curve is critical for thermal design validation in enclosed automotive enclosures where SZMMBZ5250BLT1G may operate near elevated ambient temperatures.
Does SZMMBZ5250BLT1G have a no-connect pin, and how should it be handled on PCB?
Yes, SZMMBZ5250BLT1G uses Pin 2 as a no-connect (NC) terminal per its SOT-23 Style 8 pinout. This pin is internally unconnected and must remain electrically floating - no PCB trace, solder mask opening, or thermal relief should be assigned to it. Leaving Pin 2 unconnected avoids unintended parasitic coupling and ensures consistent regulation performance of SZMMBZ5250BLT1G in high-density layouts.
How does the Zener impedance of SZMMBZ5250BLT1G affect voltage regulation stability?
SZMMBZ5250BLT1G specifies 25 Ω dynamic impedance (ZZT) at IZT = 6.2 mA, meaning a 1 mA change in Zener current causes approximately 25 mV output variation. This low impedance ensures stable regulation under moderate load transients, especially important in precision reference and fault-monitoring applications where SZMMBZ5250BLT1G serves as the primary voltage threshold element.
SZMMBZ5250BLT1G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 20 V
- Tolerance:
- ±5%
- Power - Max:
- 225 mW
- Impedance (Max) (Zzt):
- 25 Ohms
- Current - Reverse Leakage @ Vr:
- 100 nA @ 15 V
- Voltage - Forward (Vf) (Max) @ If:
- 900 mV @ 10 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-3 (TO-236)
SZMMBZ5250BLT1G FAQ
1.How can I place an order for SZMMBZ5250BLT1G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZMMBZ5250BLT1G 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 SZMMBZ5250BLT1G reliable?
The price and inventory of SZMMBZ5250BLT1G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZMMBZ5250BLT1G is usually 5 days.
3.What payment methods are accepted for SZMMBZ5250BLT1G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZMMBZ5250BLT1G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZMMBZ5250BLT1G?
SZMMBZ5250BLT1G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZMMBZ5250BLT1G 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 SZMMBZ5250BLT1G?
For technical support, including SZMMBZ5250BLT1G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZMMBZ5250BLT1G requirements.
6.How does Aetrix verify that SZMMBZ5250BLT1G is sourced from the original manufacturer or authorized distributors?
All SZMMBZ5250BLT1G 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 SZMMBZ5250BLT1G meets industry standards.
7.What is the process for return or replacement of SZMMBZ5250BLT1G?
All SZMMBZ5250BLT1G units undergo pre-shipment inspection (PSI). If there is an issue with SZMMBZ5250BLT1G, 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 SZMMBZ5250BLT1G part is unused and in its original packaging.
Return procedure for SZMMBZ5250BLT1G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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