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Diodes Incorporated 1SMB5925B-13
- Part No.:
- 1SMB5925B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5925B-13.pdf
- Description:
- DIODE ZENER 10V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:132,480
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Product details
Overview
1SMB5925B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage of 10.0V (±5%), dynamic impedance of 37.5Ω at 4.5mA test current, and maximum reverse leakage of 0.25µA at 8V. It provides precise voltage regulation in DC power rails and overvoltage protection circuits for industrial power supplies.
For engineers reviewing the 1SMB5925B-13 datasheet, 1SMB5925B-13 pinout, 1SMB5925B-13 application, or 1SMB5925B-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (226°C/W), ESD rating (>16kV HBM), SMB package compatibility, and derating behavior above +25°C ambient.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and temperature conditions. Its 3.0W power dissipation rating applies at terminal temperature ≤+75°C, with linear derating at 40mW/°C above that point.
The device exhibits a typical temperature coefficient of +5.5mV/°C near 10V, low dynamic impedance (37.5Ω), and tight ±5% VZ tolerance - enabling reliable clamping and regulation in feedback loops and protection stages without external trimming.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 10.0V nominal, 9.5–10.5V range at 4.5mA - ensures predictable clamping threshold in 12V rail protection. |
| Power Dissipation (PD) | 3.0W at TL = +75°C - supports high-energy transient suppression when mounted on copper pads. |
| Zener Impedance (ZZT) | 37.5Ω at IZT = 4.5mA - minimizes output voltage variation under dynamic load changes. |
| Reverse Leakage (IR) | 0.25µA max at VR = 8V - preserves low quiescent current in battery-backed reference circuits. |
| ESD Rating | Class 3 (>16kV) per HBM - withstands handling and board-level electrostatic discharge without degradation. |
| Thermal Resistance (RθJA) | 226°C/W - requires PCB copper area planning to avoid junction overheating at full power. |
| Package | SMB (DO-214AA) - industry-standard SMT footprint compatible with automated placement and reflow. |
Pinout & Package
SMB package: molded plastic case (UL 94V-0), cathode band marking, 0.096g weight, moisture sensitivity level 1. Dimensions: 3.30–3.94mm (L) × 4.06–4.57mm (W) × 1.96–2.21mm (H).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction path / Zener reference ground node | Connected to circuit ground or lower-potential rail; forms reference return path during regulation. |
| Cathode | Zener breakdown terminal / regulated output node | Connected to protected node (e.g., IC supply pin); conducts reverse current to clamp excess voltage. |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling | Enables single-device overvoltage protection for 12V systems without parallel stacking or heatsinking. |
| ±5% Zener Voltage Tolerance | Reduces need for post-assembly calibration in precision voltage reference designs. |
| ESD >16kV (HBM) | Eliminates requirement for additional ESD input protection in front-end power interfaces. |
| Lead-Free & Halogen-Free | Meets RoHS 3 and JEDEC green standards for automotive and industrial compliance-critical programs. |
| SMB Surface-Mount Package | Supports high-volume pick-and-place assembly and IPC-A-610 Class 2/3 solder joint reliability. |
Applications
| DC Power Rail Protection | Voltage Reference for ADCs |
|---|---|
|
Use Scenario: Clamping transient spikes on 12V microcontroller supply lines in factory automation PLC modules. IC Role / Device Role / Timing Role: Zener diode acts as shunt regulator, diverting surge current away from sensitive logic ICs during inductive load switching. Use Value: Prevents brownout resets and latch-up by holding rail voltage within ±0.5V of 12V during 100ns–1µs transients up to 30V. |
Use Scenario: Providing stable 10.0V reference for 12-bit SAR ADC in industrial sensor signal conditioning. IC Role / Device Role / Timing Role: Functions as precision voltage source for ADC reference input, replacing bulkier TL431-based solutions. Use Value: Delivers <0.5% initial error and <50ppm/°C drift across –40°C to +85°C, enabling ±0.1% measurement accuracy. |
| Overvoltage Crowbar Circuit | LED Driver Current Regulation |
|
Use Scenario: Triggering SCR-based crowbar in telecom power converters during sustained overvoltage events. IC Role / Device Role / Timing Role: Zener senses output voltage rise and initiates gate drive to short-circuit output, forcing upstream OCP response. Use Value: Activates within 200ns at 10.8V, ensuring converter shutdown before MOSFET overvoltage failure occurs. |
Use Scenario: Setting constant current for high-brightness LED strings in outdoor signage drivers. IC Role / Device Role / Timing Role: Used in series with current-sense resistor to establish fixed voltage drop, enabling accurate ILED control. Use Value: Maintains ±3% current regulation across line voltage variations from 10.5V to 13.2V due to low ZZT and tight VZ tolerance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5925B | Same 10V zener voltage and ±5% tolerance, but DO-41 through-hole package and 1.0W power rating. | Requires manual insertion or wave soldering; unsuitable for high-density SMT layouts. | Select only for legacy through-hole designs or prototyping where reworkability outweighs power density. |
| BZX85C10 | 10V zener, ±5%, but 1.3W rating and DO-41 package; higher ZZT (100Ω) and no specified ESD rating. | Limited to low-energy regulation; lacks HBM robustness for field-deployed equipment. | Acceptable for cost-sensitive consumer products with controlled ESD environments and <1W dissipation needs. |
Compared with 1N5925B and BZX85C10, the 1SMB5925B-13 delivers 3× higher power handling in an SMT package with certified ESD immunity - making it the preferred choice for industrial-grade 12V system protection where reliability, density, and surge resilience are critical.
Availability
1SMB5925B-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and telecom DC-DC converters requiring stable component supply with full RoHS 3 and halogen-free compliance.
Supply support for 1SMB5925B-13 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 semiconductor company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and protection applications.
The 1SMB59xxB series targets high-reliability surface-mount voltage regulation and transient suppression, designed specifically for automated manufacturing and harsh-environment deployments in industrial and infrastructure systems.
FAQ
What is the maximum continuous reverse voltage this Zener can sustain without breakdown?
The 1SMB5925B-13 has a nominal zener voltage of 10.0V with a guaranteed breakdown range of 9.5V to 10.5V at 4.5mA. Below 9.5V, it remains in high-impedance reverse blocking mode with leakage <0.25µA - so sustained reverse voltage must stay below 9.5V to avoid entering regulation.
How does thermal derating affect its usable power at 85°C ambient?
At +25°C ambient, rated power is 550mW; above that, it derates at 4.4mW/°C. At +85°C ambient, usable power drops to 550mW − (60°C × 4.4mW/°C) = 286mW - requiring PCB copper area or airflow to manage junction temperature if operating near full 3.0W capability.
Can this part replace a 1N4740A in an existing design?
No - the 1N4740A is a 10V, 1W DO-41 Zener with 17Ω impedance and different thermal characteristics. The 1SMB5925B-13 offers 3× power, SMB footprint, and superior ESD rating, but requires layout revision and thermal validation due to differing package and derating curves.
Is the cathode band polarity consistent across all SMB-packaged Zeners from Diodes Inc.?
Yes - all SMB-packaged Zeners in the 1SMB59xxB series use a single black cathode band at one end, aligned with the cathode terminal per Diodes Incorporated's standard marking convention and AP02001 pad layout documentation.
1SMB5925B-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 10 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 4.5 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 8 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
1SMB5925B-13 FAQ
1.How can I place an order for 1SMB5925B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5925B-13 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 1SMB5925B-13 reliable?
The price and inventory of 1SMB5925B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5925B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5925B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5925B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5925B-13?
1SMB5925B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5925B-13 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 1SMB5925B-13?
For technical support, including 1SMB5925B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5925B-13 requirements.
6.How does Aetrix verify that 1SMB5925B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5925B-13 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 1SMB5925B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5925B-13?
All 1SMB5925B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5925B-13, 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 1SMB5925B-13 part is unused and in its original packaging.
Return procedure for 1SMB5925B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5925B-13 Tags
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