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Diodes Incorporated 1SMB5936B-13
- Part No.:
- 1SMB5936B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5936B-13.pdf
- Description:
- DIODE ZENER 30V 550MW SMB
- Quantity:
- Payment:
- Shipping:
Inventory:2,685
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Product details
Overview
1SMB5936B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with a nominal zener voltage of 30V (±5% tolerance), 28mA test current, and 12.5Ω dynamic impedance at IZT; it provides precise voltage regulation in power supply feedback loops, overvoltage protection circuits, and reference voltage generation for industrial power converters.
For engineers reviewing the 1SMB5936B-13 datasheet, 1SMB5936B-13 pinout, 1SMB5936B-13 application, or 1SMB5936B-13 equivalent, this device is selected for stable 30V clamping in DC-DC converter feedback paths, surge-protected sensor interfaces, and low-noise analog references where thermal stability and ESD robustness (>16kV HBM) are critical.
Technical Context
This Zener diode operates in reverse breakdown mode to maintain a stable 30V reference across varying load currents (up to 50mA max reverse current at 22.8V). Its 25°C/W junction-to-terminal thermal resistance enables reliable 3.0W dissipation when mounted on FR-4 PCBs with Diodes Inc.'s recommended pad layout (AP02001).
The device exhibits a positive temperature coefficient above ~5V, with typical TC near +0.075%/°C for 30V parts-enabling predictable drift compensation in precision references. Its 1.5V forward voltage at 200mA supports bidirectional ESD protection configurations when used in conjunction with series resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 30V nominal, 28.5–31.5V range at 28mA - ensures tight regulation in 24V/28V system rails |
| Power Dissipation (PD) | 3.0W @ TL = +75°C - supports high-energy transient suppression without heatsinking |
| Zener Impedance (ZZT) | 12.5Ω @ IZT = 28mA - minimizes output voltage variation under dynamic load changes |
| Reverse Current (IR) | 0.25µA @ VR = 22.8V - guarantees low leakage in high-impedance reference nodes |
| ESD Rating | Class 3 (>16kV HBM) - protects downstream circuitry during handling and board assembly |
| Package | SMB (DO-214AA) - industry-standard SMT footprint compatible with automated pick-and-place |
| Operating Temp | −65°C to +150°C - suitable for under-hood automotive and industrial ambient environments |
Pinout & Package
Package: SMB (DO-214AA), molded plastic case with cathode band marking; dimensions: 3.30–3.94mm (L) × 4.06–4.57mm (W) × 1.96–2.21mm (H); weight ≈ 0.096g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reverse breakdown reference node | Connected to lower-potential rail in shunt regulator configuration; defines clamping threshold relative to cathode |
| Cathode | Zener voltage reference terminal / High-side connection point | Connected to regulated output node; voltage at cathode remains stable at ~30V when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling | Enables single-device overvoltage clamping for 24V systems up to 100mA fault current without external heat sinking |
| ±5% Zener Tolerance | Reduces need for post-assembly trimming in factory-set power supply feedback networks |
| Lead-Free & Halogen-Free | Meets RoHS 3 (2015/863/EU) and green manufacturing requirements for global industrial shipments |
| ESD Robustness | Withstands >16kV human-body-model discharge-critical for unshielded sensor front-ends and field-serviceable modules |
| Moisture Sensitivity Level 1 | Eliminates bake-out requirement prior to reflow, reducing production cycle time and cost |
Applications
| Industrial Power Supply Feedback | Automotive Load Dump Protection |
|---|---|
Use Scenario: Regulating output voltage in isolated flyback converters using TL431-based optocoupler feedback. IC Role / Device Role / Timing Role: Shunt reference diode providing precise 30V threshold to control optocoupler LED current and primary-side PWM duty cycle. Use Value: Maintains ±1% output regulation across line/load/temperature with no external calibration required. | Use Scenario: Clamping transients on 24V battery rails during alternator load dump events per ISO 7637-2 Pulse 5a. IC Role / Device Role / Timing Role: Fast-acting voltage clamp absorbing peak energy (up to 300W for 40ms) before downstream DC-DC converters. Use Value: Limits rail voltage to ≤33V, preventing damage to 36V-rated CAN transceivers and microcontrollers. |
| Programmable Reference Generator | ESD-Protected Sensor Interface |
Use Scenario: Generating stable 30V reference for 16-bit ADC biasing in precision data acquisition systems. IC Role / Device Role / Timing Role: Low-drift Zener source feeding op-amp buffer to drive ADC reference input with <10ppm/°C drift contribution. Use Value: Achieves <0.005% full-scale error over −40°C to +85°C without active temperature compensation. | Use Scenario: Protecting analog inputs of pressure sensors exposed to handheld ESD events in factory automation equipment. IC Role / Device Role / Timing Role: Bidirectional clamp (anode grounded, cathode to signal line) limiting excursion to ±31.5V/−0.7V. Use Value: Survives >10,000 contact discharges at 16kV while maintaining <1nA leakage at 22.8V operating bias. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5936B | Same 30V rating and ±5% tolerance, but DO-41 through-hole package (not SMT) | Requires manual soldering or wave soldering; unsuitable for high-density PCBs or automated assembly | Select only for legacy repair, prototyping, or low-volume through-hole designs where reflow compatibility is not required |
| SMBJ30A | TVS diode (30V standoff, 48.3V clamping), 600W peak pulse power, higher leakage (5µA @ 24.3V) | Designed for transient suppression-not precision regulation; cannot replace in feedback loops | Choose only for surge-only protection; never substitute in voltage reference or regulation roles due to lack of stable Zener knee |
Compared with 1N5936B and SMBJ30A, the 1SMB5936B-13 uniquely combines SMT manufacturability, low dynamic impedance (12.5Ω), and sub-microamp leakage-making it the only viable choice for compact, high-accuracy shunt regulators in modern power electronics.
Availability
1SMB5936B-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, programmable logic controller (PLC) analog I/O cards, and medical diagnostic equipment requiring stable component supply and long-term obsolescence management.
Supply support for 1SMB5936B-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 components for power management, signal integrity, and protection applications.
The SMB Zener series was developed for high-power, high-stability voltage regulation in space-constrained SMT designs-targeting industrial automation, automotive subsystems, and telecom infrastructure where thermal performance and process compatibility are critical.
FAQ
What is the maximum continuous reverse current the 1SMB5936B-13 can sustain at 25°C ambient?
The device supports up to 50mA continuous reverse current at 22.8V (rated VR), corresponding to its 3.0W power limit. At 25°C ambient on FR-4 PCB, derating begins above +25°C at 4.4mW/°C, so sustained operation at full 3.0W requires thermal management or reduced ambient temperature.
Does the 1SMB5936B-13 have a specified temperature coefficient for its zener voltage?
Yes-the datasheet shows typical TC vs. VZ curve (Figure 2), indicating approximately +0.075%/°C for 30V devices. This positive coefficient allows predictable drift compensation when paired with negative-TC components in precision references.
Can the 1SMB5936B-13 be used in bidirectional ESD protection configurations?
Yes-when anode is grounded and cathode connected to signal line, it clamps positive transients to ~31.5V and negative transients to ~−0.7V (forward VF). Its 1.5V forward voltage at 200mA and 16kV HBM rating make it suitable for I/O port protection in ruggedized equipment.
Is the SMB package of the 1SMB5936B-13 compatible with standard IPC-7351B land patterns?
Yes-the SMB (DO-214AA) footprint matches IPC-7351B "SMB" generic pattern. Diodes Inc. recommends pad dimensions C=4.30mm, G=1.80mm, X=2.50mm, X1=6.80mm, Y=2.30mm (per AP02001), which align with IPC Class L (least) tolerances for automated assembly yield >99.98%.
1SMB5936B-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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 28 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 22.8 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
1SMB5936B-13 FAQ
1.How can I place an order for 1SMB5936B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5936B-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 1SMB5936B-13 reliable?
The price and inventory of 1SMB5936B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5936B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5936B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5936B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5936B-13?
1SMB5936B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5936B-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 1SMB5936B-13?
For technical support, including 1SMB5936B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5936B-13 requirements.
6.How does Aetrix verify that 1SMB5936B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5936B-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 1SMB5936B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5936B-13?
All 1SMB5936B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5936B-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 1SMB5936B-13 part is unused and in its original packaging.
Return procedure for 1SMB5936B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5936B-13 Tags
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