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onsemi 1SMB5928BT3
- Part No.:
- 1SMB5928BT3
- Manufacturer:
- onsemi
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5928BT3.pdf
- Description:
- DIODE ZENER 13V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,591
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Product details
Overview
1SMB5928BT3 from onsemi is a 3 W surface-mount Zener diode with nominal zener voltage of 13 V (±5%), maximum zener impedance of 28.8 Ω at 7 mA test current, and reverse leakage current ≤0.25 μA at 9.9 V. It operates across −65 °C to +150 °C and is used for precision voltage regulation and overvoltage protection in DC power rails.
For engineers reviewing the 1SMB5928BT3 datasheet, pinout, applications, or equivalent options, key selection criteria include zener tolerance, thermal resistance (226 °C/W at TA = 25 °C), surge power capability (up to 100 W non-repetitive), Pb-free SMB package compatibility, and AEC-Q101 qualification status.
Technical Context
This device functions as a two-terminal voltage reference diode operating in reverse breakdown. Its 13 V nominal zener voltage is specified at IZT = 7 mA with ±5% tolerance, and it exhibits a positive temperature coefficient above ~5 V, confirmed by θVZ ≈ +5.5 mV/°C near 13 V.
Thermal design relies on junction-to-ambient thermal resistance of 226 °C/W (at TA = 25 °C) and junction-to-lead resistance of 40 °C/W, enabling stable regulation under PCB-constrained conduction cooling. The SMB package supports top-side or bottom-side mounting with modified L-bend leads for enhanced pad contact area.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 13 V nominal (12.35–13.65 V range); defines regulated output voltage under 7 mA test current |
| Power Dissipation (PD) | 3.0 W @ TL = 75 °C; derates linearly above 75 °C at 25 mW/°C |
| Zener Impedance (ZZT) | 28.8 Ω max @ IZT = 7 mA; determines regulation accuracy under load transients |
| Reverse Leakage (IR) | ≤0.25 μA @ VR = 9.9 V; ensures minimal standby current in clamp circuits |
| Max DC Zener Current (IZM) | 115 mA; sets absolute upper limit for continuous reverse conduction without degradation |
| Thermal Resistance (RJA) | 226 °C/W @ TA = 25 °C on FR-4 board; critical for ambient-temperature-limited designs |
| ESD Rating | Class 3 (>16 kV HBM); enables robust handling in automated SMT assembly environments |
Pinout & Package
Package: SMB (Case 403A), surface-mount plastic package with cathode band marking; dimensions: 3.56 mm × 4.32 mm × 1.02 mm (L × W × H); RoHS-compliant, Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / low-voltage reference node | Connected to circuit ground or lower-potential rail during zener operation |
| Cathode | Reverse breakdown terminal / regulated output node | Connected to supply rail or protected node; polarity band identifies this terminal |
Key Features
| Feature | Design Value |
|---|---|
| 3 W steady-state power rating | Enables use in higher-current regulation and transient clamping vs. 1 W Zeners (e.g., 1N47xx) |
| AEC-Q101 qualified (SZ prefix variant) | Validated for automotive electronics applications requiring reliability under temperature cycling and vibration |
| Flat handling surface | Improves pick-and-place accuracy and reduces tombstoning risk during reflow soldering |
| UL 94 V-0 flammability rating | Meets safety standards for enclosed industrial and automotive enclosures |
| Modified L-bend leads | Increases solder joint area and mechanical strength on PCB pads compared to standard gull-wing leads |
Applications
| Automotive ECU Power Rail Clamp | Industrial Sensor Signal Conditioning |
|---|---|
Use Scenario: Clamping 12 V battery-supplied microcontroller power input against load-dump transients up to 40 V. IC Role / Device Role / Timing Role: Zener diode acting as shunt overvoltage protector in parallel with LDO input. Use Value: Limits peak voltage to ≤13.65 V with <0.25 μA leakage at 9.9 V, preserving LDO integrity without loading quiescent current. |
Use Scenario: Providing stable 13 V reference for analog front-end amplifiers in 4–20 mA loop transmitters. IC Role / Device Role / Timing Role: Two-terminal voltage reference establishing bias point for op-amp gain stages. Use Value: Delivers ±5% tolerance and 28.8 Ω dynamic impedance to maintain reference stability across 5–10 mA load variations. |
| DC-DC Converter Feedback Divider | Programmable Logic Controller (PLC) Input Protection |
Use Scenario: Replacing TL431-based feedback in isolated flyback converters where cost and BOM count are constrained. IC Role / Device Role / Timing Role: Passive zener element setting output voltage via resistor divider network. Use Value: Eliminates active IC while maintaining 13 V setpoint with thermal coefficient matched to typical optocoupler CTR drift. |
Use Scenario: Protecting 24 V digital input channels from field-wiring induced surges and miswiring events. IC Role / Device Role / Timing Role: Primary shunt clamp absorbing >100 W non-repetitive surge energy per IEC 61000-4-5. Use Value: Withstands 100 W peak surge (Fig. 2) and maintains <0.25 μA leakage below trip threshold, minimizing false triggering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same 13 V nominal rating but 5 W power rating; larger DO-201AD package; RJA = 30 °C/W (heatsink-dependent) | Requires heatsinking for sustained 3 W operation; unsuitable for dense SMT layouts | Select when higher surge energy absorption is needed and board space allows axial/through-hole mounting |
| BZX84-C13 | 13 V Zener in SOT-23; rated for 300 mW only; ZZT = 30 Ω @ 5 mA; no AEC-Q101 qualification | Limited to low-power signal-level clamping; not rated for automotive or industrial ambient extremes | Select only for space-constrained, non-automotive consumer applications with <100 mW average dissipation |
Compared with 1N5349B and BZX84-C13, the 1SMB5928BT3 delivers optimal balance of 3 W SMT power handling, AEC-Q101 compliance, and 28.8 Ω impedance in a compact SMB footprint-making it preferred for automotive body control modules and industrial PLC I/O cards where reliability and density are jointly critical.
Availability
1SMB5928BT3 is available at Aetrix Electronics and suitable for automotive ECUs, industrial sensor interfaces, DC-DC converter feedback networks, and programmable logic controller input protection requiring stable component supply and long-term lifecycle support.
Supply support for 1SMB5928BT3 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 (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensor, and connectivity solutions for automotive, industrial, cloud, and IoT applications.
The 1SMB59xxBT3 series was designed for high-reliability surface-mount voltage regulation and transient suppression in harsh-environment systems-particularly targeting automotive power distribution and industrial control where AEC-Q101 qualification and 3 W dissipation are essential.
FAQ
What is the zener voltage tolerance for 1SMB5928BT3?
The 1SMB5928BT3 has a nominal zener voltage of 13 V with a tolerance of ±5%, meaning the actual measured VZ falls between 12.35 V and 13.65 V at IZT = 7 mA and TL = 30 °C. This tolerance is explicitly defined in the Electrical Characteristics table on page 3 of the official onsemi datasheet (Rev. 7, November 2011).
Is 1SMB5928BT3 suitable for automotive applications?
Yes-the SZ-prefix variant (e.g., SZ1SMB5928BT3G) is AEC-Q101 qualified and PPAP capable, meeting automotive reliability requirements. While the base 1SMB5928BT3 part is not automatically qualified, its identical die and construction are validated in the SZ-series, and the "G" suffix denotes Pb-free compliance required for automotive supply chains. Always specify the SZ prefix for automotive use.
What is the maximum surge power rating for 1SMB5928BT3?
The 1SMB5928BT3 supports up to 100 W of non-repetitive peak surge power for pulse widths ≤1 ms (per Figure 2 in the datasheet). This capability is critical for transient voltage suppression in 12 V automotive systems exposed to load-dump events, and assumes TJ = 25 °C prior to the pulse.
Does 1SMB5928BT3 have a specified temperature coefficient?
Yes-Figure 4 of the datasheet shows the temperature coefficient (θVZ) for 12–200 V devices is approximately +5.5 mV/°C near 13 V. This positive coefficient means VZ increases with junction temperature, which must be accounted for in precision reference designs operating across wide ambient ranges.
What is the forward voltage drop specification for 1SMB5928BT3?
The forward voltage (VF) for 1SMB5928BT3 is specified as ≤1.5 V at IF = 200 mA(dc), consistent across the entire 1SMB59xxBT3 family. This parameter applies only during forward conduction (anode positive relative to cathode) and is relevant for reverse-polarity protection configurations.
1SMB5928BT3 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- onsemi
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SMB
1SMB5928BT3 FAQ
1.How can I place an order for 1SMB5928BT3 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5928BT3 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 1SMB5928BT3 reliable?
The price and inventory of 1SMB5928BT3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5928BT3 is usually 5 days.
3.What payment methods are accepted for 1SMB5928BT3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5928BT3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5928BT3?
1SMB5928BT3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5928BT3 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 1SMB5928BT3?
For technical support, including 1SMB5928BT3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5928BT3 requirements.
6.How does Aetrix verify that 1SMB5928BT3 is sourced from the original manufacturer or authorized distributors?
All 1SMB5928BT3 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 1SMB5928BT3 meets industry standards.
7.What is the process for return or replacement of 1SMB5928BT3?
All 1SMB5928BT3 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5928BT3, 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 1SMB5928BT3 part is unused and in its original packaging.
Return procedure for 1SMB5928BT3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5928BT3 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
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BZT52C15-7-F
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
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SMAZ12-13-F
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