My Inquiry
My Account
onsemi SZ1SMB5928BT3G
- Part No.:
- SZ1SMB5928BT3G
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SZ1SMB5928BT3G.pdf
- Description:
- DIODE ZENER 13V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:808
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SZ1SMB5928BT3G from onsemi is a 3 W surface-mount Zener diode with nominal zener voltage of 13 V, ±5% tolerance, 28.8 Ω dynamic impedance at 7 mA test current, and 0.25 μA reverse leakage at 9.9 V, designed for precision voltage regulation and overvoltage protection in automotive power supplies and industrial DC rails.
For engineers reviewing the SZ1SMB5928BT3G datasheet, pinout, applications, or equivalent options, key selection criteria include zener voltage stability across temperature, low dynamic impedance for tight regulation, AEC−Q101 qualification for automotive use, and SMB package thermal performance under sustained 3 W dissipation.
Technical Context
This device operates as a two-terminal voltage reference, clamping reverse-biased voltage to its specified zener breakdown level with minimal deviation over temperature and current variation. Its 13 V nominal zener voltage falls within the 12–82 V range where temperature coefficient is positive and stable (≈+4.5 mV/°C), enabling predictable drift behavior in feedback loops.
The SMB package delivers 40 °C/W junction-to-lead thermal resistance and supports 3.0 W steady-state dissipation at 75 °C lead temperature, with derating to 550 mW at 25 °C ambient. It features ESD robustness >16 kV HBM and Pb-free construction compliant with automotive PPAP requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 12.35–13.65 V @ IZT = 7 mA - defines regulated output voltage window under nominal bias |
| Zener Impedance (ZZT) | 28.8 Ω max @ IZT = 7 mA - determines regulation accuracy under load transients |
| Max DC Zener Current (IZM) | 115 mA - sets absolute upper limit for continuous safe conduction without thermal runaway |
| Reverse Leakage (IR) | 0.25 μA max @ VR = 9.9 V - ensures minimal standby current in undervoltage detection circuits |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C - enables compact PCB layout with direct lead heat sinking |
| Thermal Resistance (RJL) | 40 °C/W - allows accurate junction temperature estimation from measured lead temperature |
| ESD Rating | Class 3 (>16 kV) per HBM - eliminates need for external ESD protection in board-level interfaces |
Pinout & Package
The SZ1SMB5928BT3G uses the SMB (Case 403A) surface-mount plastic package with cathode indicated by a polarity band. Dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H), with modified L-bend leads for enhanced pad contact area and solder joint reliability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to system ground or lower-potential rail; establishes reference point for zener clamping |
| Cathode | Zener breakdown terminal / Regulated output node | Connected to protected node; maintains voltage at VZ during overvoltage events |
Key Features
| Feature | Design Value |
|---|---|
| AEC−Q101 qualification | Validated for automotive underhood environments including temperature cycling, humidity, and vibration stress |
| Flat handling surface | Enables high-accuracy automated placement with <±0.1 mm X/Y repeatability on SMT lines |
| UL 94 V−0 flammability rating | Meets safety-critical enclosure requirements for industrial power modules and EV charging systems |
| Pb−free construction | Complies with RoHS Directive 2011/65/EU and J-STD-609A Class 3 moisture sensitivity level |
| Top/bottom board mounting support | Package symmetry allows routing flexibility-no keep-out zone required beneath device body |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients up to 35 V in BCM microcontroller power domains. IC Role / Device Role / Timing Role: Voltage clamp protecting 3.3 V LDO regulators and CAN transceivers from overvoltage damage. Use Value: Prevents latch-up and permanent failure during ISO 7637-2 Pulse 5a events without requiring active crowbar circuitry. |
Use Scenario: Guarding 4–20 mA current loop receiver inputs against field-wiring faults and ESD coupling. IC Role / Device Role / Timing Role: Passive overvoltage limiter placed before precision op-amp input stage and ADC front-end. Use Value: Limits input voltage to ≤13.65 V while maintaining <0.25 μA leakage, preserving signal integrity and offset accuracy. |
| DC-DC Converter Feedback Divider | Telecom Power Supply Standby Regulation |
Use Scenario: Stabilizing reference voltage in adjustable buck converter feedback network using resistor divider + Zener. IC Role / Device Role / Timing Role: Precision voltage reference replacing TL431 in cost-sensitive 12 V output converters. Use Value: Delivers ±5% VZ tolerance and 28.8 Ω ZZT for <1% output regulation error across line/load/temperature. |
Use Scenario: Maintaining regulated 13 V standby rail for real-time clock and memory retention during main power loss. IC Role / Device Role / Timing Role: Low-quiescent-current shunt regulator powering ultra-low-power backup circuits. Use Value: Draws only 0.25 μA at 9.9 V, extending battery life beyond 10 years in coin-cell–powered applications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C13LT1G | 250 mW SOT-23 package, 13 V ±5%, ZZT = 30 Ω @ 5 mA | Lower power rating limits use to signal-level clamping only; unsuitable for 3 W rail protection | Select when space-constrained PCBs require SOT-23 footprint and peak power <0.25 W |
| 1N5349B | 5 W DO-15 through-hole package, 13 V ±5%, ZZT = 10 Ω @ 150 mA | Higher power and lower impedance suit high-current regulation but require manual assembly or wave soldering | Select when thermal mass and higher surge capability are prioritized over SMT automation compatibility |
Compared with BZX84-C13LT1G and 1N5349B, SZ1SMB5928BT3G uniquely balances 3 W surface-mount power handling, AEC−Q101 qualification, and SMB thermal performance-making it optimal for automotive and industrial SMT production where reliability, manufacturability, and mid-power clamping intersect.
Availability
SZ1SMB5928BT3G is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC analog input stages, DC-DC converter feedback networks, and telecom standby power supplies requiring stable component supply with full traceability and long-term lifecycle support.
Supply support for SZ1SMB5928BT3G 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 1SMB59xxBT3G/SZ1SMB59xxT3G series was developed specifically for high-reliability voltage regulation in harsh-environment applications, emphasizing AEC−Q101 compliance, robust ESD immunity, and consistent parametric performance across temperature and production lots.
FAQ
What is the zener voltage tolerance of SZ1SMB5928BT3G?
The SZ1SMB5928BT3G has a zener voltage tolerance of ±5%, with a specified range of 12.35 V to 13.65 V at 7 mA test current (IZT). This tolerance is confirmed in the Electrical Characteristics table on page 3 of the official onsemi datasheet, and applies across the full operating temperature range of −65 °C to +150 °C.
Is SZ1SMB5928BT3G qualified for automotive applications?
Yes, SZ1SMB5928BT3G is AEC−Q101 qualified and PPAP capable, as explicitly stated in the Features section of the onsemi datasheet. The "SZ" prefix denotes automotive-grade manufacturing controls, including site-specific process validation, extended reliability testing, and full traceability-making SZ1SMB5928BT3G suitable for under-hood and chassis-mounted systems.
What is the maximum power dissipation for SZ1SMB5928BT3G at 25°C ambient?
SZ1SMB5928BT3G has a maximum steady-state power dissipation of 550 mW at TA = 25°C, with a derating factor of 4.4 mW/°C above that temperature. This value is defined in the Maximum Ratings table (page 1) and assumes FR-4 board mounting with the recommended footprint per the datasheet's mechanical drawings.
How does the dynamic impedance of SZ1SMB5928BT3G affect regulation performance?
The dynamic impedance of SZ1SMB5928BT3G is 28.8 Ω maximum at IZT = 7 mA, directly impacting output voltage variation under changing load current. For example, a 10 mA load step induces ≤288 mV deviation-critical for maintaining stability in feedback networks and precision reference circuits where tight regulation is required.
What packaging and reel configuration is available for SZ1SMB5928BT3G?
SZ1SMB5928BT3G is supplied in Pb-free SMB packages on tape-and-reel format, with 2,500 units per reel. The ordering information on page 1 of the datasheet confirms this configuration, and the marking diagram shows "928B" as the device code with optional "G" suffix or microdot indicating Pb-free status.
SZ1SMB5928BT3G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 13 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 9.9 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
SZ1SMB5928BT3G FAQ
1.How can I place an order for SZ1SMB5928BT3G through Aetrix?
Please submit a Request for Quotation (RFQ) for SZ1SMB5928BT3G 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 SZ1SMB5928BT3G reliable?
The price and inventory of SZ1SMB5928BT3G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SZ1SMB5928BT3G is usually 5 days.
3.What payment methods are accepted for SZ1SMB5928BT3G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SZ1SMB5928BT3G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SZ1SMB5928BT3G?
SZ1SMB5928BT3G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SZ1SMB5928BT3G 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 SZ1SMB5928BT3G?
For technical support, including SZ1SMB5928BT3G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SZ1SMB5928BT3G requirements.
6.How does Aetrix verify that SZ1SMB5928BT3G is sourced from the original manufacturer or authorized distributors?
All SZ1SMB5928BT3G 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 SZ1SMB5928BT3G meets industry standards.
7.What is the process for return or replacement of SZ1SMB5928BT3G?
All SZ1SMB5928BT3G units undergo pre-shipment inspection (PSI). If there is an issue with SZ1SMB5928BT3G, 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 SZ1SMB5928BT3G part is unused and in its original packaging.
Return procedure for SZ1SMB5928BT3G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SZ1SMB5928BT3G Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
