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Diodes Incorporated 1SMB5922B-13
- Part No.:
- 1SMB5922B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5922B-13.pdf
- Description:
- DIODE ZENER 7.5V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:4,995
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Product details
Overview
1SMB5922B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with nominal zener voltage 7.5V (±5%), 3mA test current, 50Ω dynamic impedance at IZT, and ESD rating >16kV HBM. It provides precise voltage regulation in DC power rails and overvoltage protection circuits for industrial power supplies.
For engineers reviewing the 1SMB5922B-13 datasheet, 1SMB5922B-13 pinout, 1SMB5922B-13 application, or 1SMB5922B-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 Zener diode operates in reverse breakdown mode to clamp voltage at its specified VZ with tight ±5% tolerance and low dynamic impedance (50Ω at 3mA). Its 3.0W power dissipation rating applies at TL = +75°C, with linear derating of 40mW/°C above that temperature.
The device uses a copper alloy leadframe with matte tin plating, conforms to RoHS 3 and halogen/antimony-free "Green" standards, and features a cathode band polarity marker. Thermal resistance from junction to ambient is 226°C/W on FR-4 PCB per AP02001 pad layout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 7.5V nominal, 7.12–7.88V range at 3mA - ensures stable reference within ±5% under standard test conditions |
| Power Dissipation (PD) | 3.0W at TL = +75°C - supports high-energy transient suppression in compact SMB footprint |
| Zener Impedance (ZZT) | 50Ω at IZT = 3mA - minimizes output voltage variation under load changes |
| Thermal Resistance (RθJA) | 226°C/W - defines maximum junction temperature rise per watt on standard FR-4 board |
| ESD Rating (HBM) | >16kV - enables robust handling in automated manufacturing without additional ESD safeguards |
| Reverse Leakage (IR) | 0.5µA max at VR = 6V - guarantees low standby current in precision biasing applications |
| Forward Voltage (VF) | 1.5V at IF = 200mA - relevant for series-connected protection configurations |
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 | Current entry point in forward bias; connected to lower-potential node in Zener operation | Required for proper reverse-bias orientation - incorrect placement causes open-circuit failure in regulation mode |
| Cathode | Current exit point in forward bias; connected to higher-potential node in Zener operation | Marked by visible band; must face voltage source positive rail to enable breakdown conduction |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W Power Handling | Enables single-device transient voltage suppression up to 200V peak pulse power (per Figure 10) without external heatsinking |
| ±5% Zener Tolerance | Reduces need for post-assembly calibration in 5V–12V system rails and feedback networks |
| ESD Class 3 (>16kV HBM) | Eliminates requirement for upstream ESD protection in board-level handling and reflow processes |
| Lead-Free & Halogen-Free | Meets IPC-J-STD-020 Level 1 moisture sensitivity and EU RoHS 3 / "Green" compliance without derating penalties |
| SMB Package Compatibility | Supports 3000-unit tape-and-reel delivery and pick-and-place placement at ≥20,000 UPH rates |
Applications
| Industrial Power Supply Regulation | Automotive ECU Voltage Reference |
|---|---|
Use Scenario: Stabilizing 8V auxiliary rail in DIN-rail mounted PLC power modules operating from 24VDC input. IC Role / Device Role / Timing Role: Zener diode functions as shunt regulator and overvoltage clamp in feedback loop of isolated DC-DC converter. Use Value: Maintains ±2% output stability across -40°C to +85°C ambient with no active compensation required. | Use Scenario: Providing precise 7.5V reference for microcontroller ADC and sensor biasing in engine control units. IC Role / Device Role / Timing Role: Passive voltage reference element in analog front-end circuitry, directly tied to MCU VREF+ pin. Use Value: Delivers <10ppm/°C TC drift (per Figure 2) and sub-µA leakage, enabling 12-bit ADC accuracy without trimming. |
| Telecom Line Card Surge Protection | Medical Instrumentation Overvoltage Clamp |
Use Scenario: Protecting Ethernet PHY interface ICs against induced surges on 48V PoE lines in network switches. IC Role / Device Role / Timing Role: Fast-acting shunt limiter placed between data line and chassis ground, triggered by transients exceeding 12V. Use Value: Absorbs 100A 8/20µs pulses (per Figure 10) with <10ns response time and no latch-up risk. | Use Scenario: Safeguarding patient-connected analog signal paths in portable ECG monitors powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-leakage clamping device across op-amp inputs to prevent saturation during electrode disconnect events. Use Value: Limits fault current to <1µA at 6V while maintaining isolation integrity per IEC 60601-1 creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C7V5 | 300mW rating, SOT-23 package, ±5% tolerance, 80Ω ZZT at 5mA | Lower power handling limits use to low-current biasing; unsuitable for >100mA surge clamping | Select when space-constrained PCBs require SOT-23 footprint and thermal load ≤300mW |
| 1N5340B | 5W rating, DO-15 through-hole package, ±5% tolerance, 10Ω ZZT at 120mA | Higher power and lower impedance but incompatible with SMT automation and dense layouts | Select when legacy through-hole assembly or >3W continuous dissipation is required |
Compared with BZX84-C7V5 and 1N5340B, the 1SMB5922B-13 uniquely balances 3.0W SMT-compatible power handling, 50Ω impedance, and ESD-hardened construction - making it optimal for modern industrial and automotive boards where reliability, density, and manufacturability intersect.
Availability
1SMB5922B-13 is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU voltage reference, and telecom line card surge protection requiring stable component supply across extended temperature ranges and high-volume production cycles.
Supply support for 1SMB5922B-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, headquartered in Plano, Texas, with design centers across Asia and manufacturing facilities in China, Taiwan, and the US.
The SMB Zener series targets high-reliability, high-volume applications demanding precise voltage regulation in compact surface-mount packages - specifically engineered for industrial, automotive, and communications infrastructure where thermal performance and process compatibility are critical.
FAQ
What is the maximum continuous Zener current (IZM) for 1SMB5922B-13 at 25°C?
The maximum Zener current is calculated as PD/VZ = 550mW / 7.5V ≈ 73mA at TA = +25°C. This value decreases linearly above +25°C at 4.4mW/°C, reaching zero at approximately +155°C ambient.
Does 1SMB5922B-13 require a heatsink for 3.0W operation?
No heatsink is required for 3.0W operation if the device is mounted on an FR-4 PCB using Diodes Inc.'s AP02001 recommended pad layout (C = 4.30mm, X1 = 6.80mm) and the lead temperature (TL) is maintained at +75°C or below per datasheet Note 5.
How does the 7.5V zener voltage change with temperature?
Per Figure 2 in DS32125 Rev. 8-2, the temperature coefficient (TC) for a 7.5V Zener is approximately +3.5mV/°C. This results in a +0.35V increase over a 100°C range (−40°C to +60°C), yielding a practical VZ span of ~7.15V to 7.55V in typical operating conditions.
Can 1SMB5922B-13 be used in parallel for higher power handling?
No - Zener diodes exhibit negative temperature coefficients and mismatched VZ tolerances, causing current hogging and thermal runaway when paralleled. For higher power, select a single higher-rated device like 1N5340B (5W) or implement active regulation instead.
1SMB5922B-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):
- 7.5 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 3 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 6 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
1SMB5922B-13 FAQ
1.How can I place an order for 1SMB5922B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5922B-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 1SMB5922B-13 reliable?
The price and inventory of 1SMB5922B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5922B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5922B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5922B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5922B-13?
1SMB5922B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5922B-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 1SMB5922B-13?
For technical support, including 1SMB5922B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5922B-13 requirements.
6.How does Aetrix verify that 1SMB5922B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5922B-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 1SMB5922B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5922B-13?
All 1SMB5922B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5922B-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 1SMB5922B-13 part is unused and in its original packaging.
Return procedure for 1SMB5922B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5922B-13 Tags
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