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onsemi SZ1SMB5915BT3G
- Part No.:
- SZ1SMB5915BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5915BT3G.pdf
- Description:
- DIODE ZENER 3.9V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:3,936
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Product details
Overview
SZ1SMB5915BT3G from onsemi is a 3.9 V ±5% Zener voltage regulator diode in SMB package, rated for 3 W steady-state power dissipation at TL = 75°C, with 96.1 Ω maximum Zener impedance at 7.5 mA test current, and 1 μA reverse leakage at 2.5 V, used for precision voltage reference and overvoltage protection in DC power rails.
For engineers reviewing the SZ1SMB5915BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include Zener voltage tolerance (±5%), thermal resistance (40 °C/W junction-to-lead), ESD rating (>16 kV HBM), AEC-Q101 qualification status, and SMB surface-mount compatibility with FR-4 boards.
Technical Context
This device operates as a two-terminal silicon Zener diode with sharp reverse breakdown at nominal 3.9 V, designed for stable DC voltage regulation under varying load and temperature conditions. Its 96.1 Ω dynamic impedance at 7.5 mA ensures low output variation across operating current range.
The SMB package enables top-side or bottom-side PCB mounting with modified L-bend leads for enhanced solder joint reliability. Thermal design leverages 40 °C/W junction-to-lead resistance and 226 °C/W junction-to-ambient resistance on FR-4, supporting operation from −65 °C to +150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 3.70–4.10 V (±5% tolerance at IZT = 7.5 mA; defines regulated output voltage window) |
| Power Dissipation (PD) | 3.0 W @ TL = 75°C (derates linearly above 75°C at 25 mW/°C; sets max continuous thermal load) |
| Zener Impedance (ZZT) | 96.1 Ω max @ IZT = 7.5 mA (low dynamic impedance ensures minimal voltage shift under load transients) |
| Reverse Leakage (IR) | 1 μA max @ VR = 2.5 V (ensures negligible standby current in undervoltage clamp configurations) |
| Thermal Resistance (RJL) | 40 °C/W (junction-to-lead; enables direct heat transfer to PCB copper via lead frame) |
| ESD Rating | Class 3 (>16 kV) per Human Body Model (supports robust handling in automotive assembly environments) |
| AEC-Q101 Qualified | Yes (SZ-prefix variant meets automotive-grade reliability and stress testing requirements) |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode polarity band, Pb-free, UL 94 V-0 flammability rating, and modified L-bend leads for high-solder-joint-reliability mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener reference ground node | Connected to circuit ground or lower-potential rail; establishes reference point for Zener breakdown voltage |
| Cathode | Reverse-biased Zener terminal / regulated output node | Connected to voltage rail requiring clamping or regulation; maintains ~3.9 V above anode when reverse-biased |
Key Features
| Feature | Design Value |
|---|---|
| ±5% Zener voltage tolerance | Ensures tight regulation window (3.70–4.10 V) without external trimming, reducing BOM count in cost-sensitive designs |
| AEC-Q101 qualification | Validated for automotive applications including body control modules and infotainment power supplies where long-term reliability is mandatory |
| 16 kV HBM ESD rating | Eliminates need for supplemental ESD protection in board-level handling and automated assembly lines |
| Flat handling surface | Enables accurate pick-and-place placement during SMT assembly, minimizing tombstoning risk on fine-pitch layouts |
| Top/bottom mount flexibility | Supports dual-sided PCB assembly and space-constrained layouts where component height or routing access is limited |
Applications
| Automotive Body Control Module (BCM) | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Regulating 5 V microcontroller supply rail against battery voltage fluctuations in door module electronics. IC Role / Device Role / Timing Role: Zener voltage reference and overvoltage clamp protecting MCU VDD input. Use Value: Maintains stable 3.9 V reference for internal LDO feedback while clamping transients >4.1 V to prevent latch-up. |
Use Scenario: Providing precise bias voltage for op-amp input stages in 4–20 mA loop-powered pressure sensors. IC Role / Device Role / Timing Role: Two-terminal shunt regulator establishing stable reference point for analog front-end circuitry. Use Value: Delivers <1 μA leakage and ±5% tolerance to minimize zero-point drift and improve measurement repeatability. |
| Consumer USB-C Power Adapter Feedback | Medical Patient Monitor Auxiliary Supply |
Use Scenario: Setting secondary-side feedback threshold in isolated flyback converters for USB-C PD compliance. IC Role / Device Role / Timing Role: Precision Zener element in optocoupler feedback network controlling primary-side PWM duty cycle. Use Value: 96.1 Ω ZZT minimizes feedback error under load step changes, improving cross-regulation accuracy. |
Use Scenario: Clamping auxiliary 3.3 V logic rail in portable patient monitors exposed to ESD events during clinical use. IC Role / Device Role / Timing Role: Transient voltage suppressor and voltage limiter for microcontroller I/O protection. Use Value: >16 kV HBM rating and AEC-Q101 qualification ensure immunity to repeated clinical ESD exposure without degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1SMB5915BT3G | Same electrical specs and SMB package but lacks AEC-Q101 qualification and SZ-prefix automotive traceability | Approved for industrial/commercial use only; not suitable for automotive production or PPAP submissions | Select when automotive qualification is unnecessary and cost optimization is prioritized |
| MMSZ5226ET1G | Lower power rating (500 mW), SOD-123 package, 3.9 V ±5%, 15 Ω ZZT @ 20 mA - higher impedance at lower current | Better suited for low-current signal-level referencing; insufficient for 3 W power rail clamping | Choose only for space-constrained, low-power bias networks where thermal margin is not required |
Compared with SZ1SMB5915BT3G, 1SMB5915BT3G offers identical regulation performance but no automotive qualification, while MMSZ5226ET1G trades power capability and thermal robustness for smaller footprint and lower cost in non-power applications.
Availability
SZ1SMB5915BT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial sensor interfaces, USB-C power adapter feedback circuits, and medical auxiliary supply clamping requiring stable component supply with full traceability and long-lifecycle support.
Supply support for SZ1SMB5915BT3G 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.
The SZ1SMB59xxT3G series is part of onsemi's AEC-Q101-qualified Zener diode portfolio, engineered specifically for automotive and high-reliability industrial voltage regulation and transient suppression.
FAQ
What is the Zener voltage tolerance of SZ1SMB5915BT3G?
The SZ1SMB5915BT3G has a Zener voltage tolerance of ±5%, resulting in a guaranteed reverse breakdown range of 3.70 V to 4.10 V at 7.5 mA test current. This tolerance is specified per onsemi's datasheet revision 10 and applies to all units shipped under this part number. The nominal 3.9 V value is center-tapped within that band, enabling predictable design margins for voltage-clamped circuits.
Is SZ1SMB5915BT3G qualified for automotive applications?
Yes, SZ1SMB5915BT3G is AEC-Q101 qualified and PPAP capable, as explicitly stated in the onsemi datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, site-specific traceability, and extended reliability testing. This makes SZ1SMB5915BT3G suitable for production use in automotive body electronics, infotainment systems, and ADAS power domains where qualification evidence is contractually required.
What is the maximum power dissipation of SZ1SMB5915BT3G at ambient temperature?
SZ1SMB5915BT3G delivers 550 mW maximum steady-state power dissipation at TA = 25°C, derating linearly at 4.4 mW/°C above that temperature. At TL = 75°C (lead temperature), it supports 3.0 W - reflecting its optimized thermal path to PCB copper. Engineers must select appropriate pad area and copper weight to maintain lead temperature ≤75°C under full load to avoid exceeding absolute maximum ratings.
Does SZ1SMB5915BT3G have ESD protection built-in?
Yes, SZ1SMB5915BT3G features an ESD rating of Class 3 (>16 kV) per the Human Body Model, verified per JESD22-A114. This intrinsic robustness eliminates the need for discrete ESD diodes in many board-level protection schemes and supports direct integration into automated SMT lines without additional handling precautions beyond standard ESD protocols.
What is the reverse leakage current specification for SZ1SMB5915BT3G?
SZ1SMB5915BT3G specifies a maximum reverse leakage current (IR) of 1 μA at VR = 2.5 V, measured at TL = 30°C. This low leakage ensures minimal quiescent current draw in always-on voltage reference or clamp circuits, preserving battery life in portable and automotive standby modes while maintaining regulation integrity below the Zener knee.
SZ1SMB5915BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 3.9 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 7.5 Ohms
- Current - Reverse Leakage @ Vr:
- 25 µA @ 1 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
SZ1SMB5915BT3G FAQ
1.How can I place an order for SZ1SMB5915BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5915BT3G 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 SZ1SMB5915BT3G reliable?
The price and inventory of SZ1SMB5915BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5915BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5915BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5915BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5915BT3G?
SZ1SMB5915BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5915BT3G 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 SZ1SMB5915BT3G?
For technical support, including SZ1SMB5915BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5915BT3G requirements.
6.How does Aetrix verify that SZ1SMB5915BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5915BT3G 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 SZ1SMB5915BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5915BT3G?
All SZ1SMB5915BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5915BT3G, 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 SZ1SMB5915BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5915BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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