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Diodes Incorporated 1SMB5926B-13
- Part No.:
- 1SMB5926B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5926B-13.pdf
- Description:
- DIODE ZENER 11V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:1,790
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Product details
Overview
1SMB5926B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage 11.0V (±5%), zener test current 5.5mA, dynamic impedance 34.1Ω at IZT, and maximum reverse leakage of 0.25µA at 8.4V. It provides precision voltage regulation in DC power supply rails, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1SMB5926B-13 datasheet, 1SMB5926B-13 pinout, 1SMB5926B-13 application, or 1SMB5926B-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (RθJA = 226°C/W), power derating above +25°C, and SMB package compatibility with automated SMT assembly.
Technical Context
This discrete Zener diode operates in reverse breakdown to maintain stable voltage across its terminals under varying load and line conditions. Its 3.0W power rating at TL = +75°C and 550mW at TA = +25°C enables robust transient suppression and regulated biasing in compact power stages.
The device features a cathode band polarity marking, ESD rating >16kV (HBM Class 3), and RoHS-compliant lead-free matte tin plating on copper alloy leadframe. Its SMB package delivers low thermal resistance (RθJT = 25°C/W) when mounted per AP02001 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.0V ±5% - defines precise clamping threshold for overvoltage protection and reference stability |
| Power Dissipation (PD) | 550mW @ TA=+25°C - sets maximum continuous power handling in ambient-convection environments |
| Zener Test Current (IZT) | 5.5mA - operating point where VZ and ZZT are specified; used for design validation and biasing calculations |
| Zener Impedance (ZZT) | 34.1Ω @ IZT - determines AC regulation error and ripple rejection capability in feedback paths |
| Reverse Leakage (IR) | 0.25µA @ VR=8.4V - ensures minimal quiescent current draw in high-impedance reference nodes |
| Thermal Resistance (RθJA) | 226°C/W - quantifies junction-to-ambient temperature rise; critical for PCB thermal pad design and derating |
| ESD Rating | Class 3 (>16kV HBM) - supports robustness against handling-induced electrostatic discharge in manufacturing |
Pinout & Package
Package: SMB (Surface Mount Body), molded plastic case rated UL 94V-0, moisture sensitivity level 1, weight ≈0.096g. Cathode identified by band marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential side of regulated rail; establishes reference ground path during breakdown |
| Cathode | Zener voltage output terminal / Breakdown control node | Connected to higher-potential side; delivers stable 11.0V reference or clamps transients to this level |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling at TL=+75°C | Enables sustained operation in thermally constrained power supply enclosures without forced cooling |
| ±5% Zener Voltage Tolerance | Reduces need for post-assembly trimming in voltage reference and feedback divider networks |
| ESD Rating >16kV (HBM Class 3) | Eliminates requirement for external ESD protection in board-level handling and field deployment |
| Lead-Free & Halogen-Free "Green" Construction | Meets global environmental compliance mandates (RoHS 2/3) without compromising thermal or electrical performance |
| Automated Assembly Compatibility | SMB footprint aligns with standard pick-and-place and reflow profiles, minimizing placement yield loss |
Applications
| Industrial Power Supply Regulation | Automotive Body Control Module Reference |
|---|---|
Use Scenario: Stabilizing 12V rail feedback voltage in isolated DC-DC converters for PLC I/O modules. IC Role / Device Role: Precision shunt reference for TL431-based optocoupler feedback loop. Use Value: Maintains ±1% output regulation across -40°C to +105°C ambient using 11.0V ±5% VZ and low TC drift. | Use Scenario: Providing stable 11V reference for microcontroller ADC and sensor biasing in BCM subassemblies. IC Role / Device Role: Low-drift voltage reference replacing larger through-hole Zeners in space-constrained modules. Use Value: Delivers <0.25µA leakage at 8.4V, minimizing battery drain in always-on vehicle subsystems. |
| LED Driver Overvoltage Clamp | Telecom Line Card Surge Protection |
Use Scenario: Clamping transient spikes on constant-current LED driver outputs to prevent LED string damage. IC Role / Device Role: Fast-response shunt protector placed across LED load terminals. Use Value: Absorbs 3.0W pulses without degradation, leveraging SMB thermal mass and 226°C/W RθJA for repeatable surge handling. | Use Scenario: Secondary-stage overvoltage clamp on 48V telecom DC distribution bus before PoE controllers. IC Role / Device Role: Standby-mode voltage limiter protecting downstream DC-DC regulators and PHY ICs. Use Value: Withstands >16kV HBM ESD events and maintains <34.1Ω dynamic impedance to limit clamping overshoot during fast transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same 11V nominal VZ, but 5W power rating in DO-201AD package; RθJA ≈ 50°C/W | Requires larger PCB area and different thermal management; not SMT-compatible | Select for higher-power, through-hole designs where board space permits and manual assembly is acceptable |
| BZX84-C11 | 11V VZ in SOT-23; 300mW PD; RθJA ≈ 300°C/W; ±5% tolerance | Limited to low-power biasing due to lower power rating and higher thermal resistance | Select for ultra-compact, low-current reference nodes where 550mW derating is sufficient and SMB footprint is unavailable |
Compared with 1N5349B and BZX84-C11, the 1SMB5926B-13 uniquely balances 550mW ambient-rated power, SMB SMT compatibility, and 226°C/W thermal resistance-making it optimal for mid-power industrial DC-DC feedback and clamping where automated assembly and thermal reliability are jointly required.
Availability
1SMB5926B-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, LED driver protection, and telecom line card surge suppression requiring stable component supply and full RoHS compliance.
Supply support for 1SMB5926B-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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection devices for industrial, computing, and automotive markets.
The SMB-series Zener diodes are engineered for high-power surface-mount voltage regulation and transient suppression, targeting applications demanding automated assembly, thermal robustness, and stringent environmental compliance.
FAQ
What is the maximum continuous power dissipation for 1SMB5926B-13 at +75°C ambient?
The device is rated for 3.0W power dissipation at TL = +75°C (lead temperature), with linear derating of 40mW/°C above that point. At TA = +25°C, the maximum power is 550mW, derating at 4.4mW/°C above +25°C per the datasheet's RθJA = 226°C/W specification.
Does 1SMB5926B-13 have a specified temperature coefficient for its zener voltage?
Yes-the datasheet provides typical TC(VZ) vs. VZ curves (Figure 2). For 11V-class devices like 1SMB5926B-13, the temperature coefficient is approximately +5.5mV/°C near room temperature, indicating positive drift with increasing junction temperature.
Can 1SMB5926B-13 be used in place of a 12V Zener diode?
No-it is specifically rated for 11.0V ±5% (10.45–11.55V). Substituting it for a 12V part would result in undershoot of the target regulation or clamping voltage, potentially causing system malfunction or inadequate protection in critical applications.
Is the SMB package of 1SMB5926B-13 compatible with standard reflow soldering profiles?
Yes-the device is qualified for moisture sensitivity level 1 (MSL-1) and supports standard Pb-free reflow profiles per J-STD-020. Its matte tin finish ensures reliable wetting, and the recommended pad layout (AP02001) guarantees thermal and mechanical integrity during automated assembly.
1SMB5926B-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):
- 11 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 5.5 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 8.4 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
1SMB5926B-13 FAQ
1.How can I place an order for 1SMB5926B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5926B-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 1SMB5926B-13 reliable?
The price and inventory of 1SMB5926B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5926B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5926B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5926B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5926B-13?
1SMB5926B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5926B-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 1SMB5926B-13?
For technical support, including 1SMB5926B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5926B-13 requirements.
6.How does Aetrix verify that 1SMB5926B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5926B-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 1SMB5926B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5926B-13?
All 1SMB5926B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5926B-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 1SMB5926B-13 part is unused and in its original packaging.
Return procedure for 1SMB5926B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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