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Diodes Incorporated 1SMB5929B-13
- Part No.:
- 1SMB5929B-13
- Manufacturer:
- Diodes Incorporated
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5929B-13.pdf
- Description:
- DIODE ZENER 15V 3W SMB
- Quantity:
- Payment:
- Shipping:
Inventory:6,829
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Product details
Overview
1SMB5929B-13 from Diodes Incorporated is a 3.0W surface-mount power Zener diode with a nominal zener voltage of 15.0V (±5%), 25Ω dynamic impedance at 9mA test current, 100mA maximum reverse leakage at 11.4V, and ESD rating >16kV (HBM). It operates across –65°C to +150°C and is used for precision voltage regulation in DC power supply rails and overvoltage protection circuits.
For engineers reviewing the 1SMB5929B-13 datasheet, 1SMB5929B-13 pinout, 1SMB5929B-13 application, or 1SMB5929B-13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (226°C/W), power derating above +25°C, and SMB package compatibility with automated SMT assembly.
Technical Context
This Zener diode functions as a two-terminal voltage reference and clamp device, operating in reverse breakdown mode with specified VZ = 15.0V at IZT = 9mA and maintaining regulation down to IZK = 0.25mA. Its 25Ω zener impedance ensures stable output under varying load conditions.
Thermal design relies on its RθJA = 226°C/W (on FR-4 PCB) and RθJT = 25°C/W, enabling 550mW dissipation at +25°C ambient and linear derating to 3.0W at +75°C terminal temperature. The cathode band marking defines polarity for unidirectional clamping.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 15.0V ±5% at 9mA - sets regulated rail voltage with ±0.75V tolerance under nominal bias. |
| Power Dissipation (PD) | 550mW @ TA = +25°C - defines max continuous DC power before thermal shutdown on standard PCB. |
| Zener Impedance (ZZT) | 25Ω @ 9mA - determines output voltage variation under 1mA load change (ΔV ≈ 25mV). |
| Reverse Leakage (IR) | 100µA @ VR = 11.4V - confirms low standby current in undervoltage clamp configurations. |
| ESD Rating | Class 3 (>16kV HBM) - enables robust handling in automated assembly without external ESD protection. |
| Operating Temperature | –65°C to +150°C - supports industrial and automotive under-hood applications without derating. |
| Package | SMB (DO-214AA) - 3.3–3.94mm × 4.06–4.57mm footprint compatible with IPC-7351B standard SMT pads. |
Pinout & Package
SMB (DO-214AA) surface-mount package with molded plastic case (UL 94V-0), cathode band marking on top surface, and copper alloy leadframe with matte tin plating. Weight: 0.096g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference node for reverse-bias operation | Connected to lower-potential rail (e.g., GND or return path) during zener regulation. |
| Cathode | Output node for regulated voltage | Delivers stable 15V to load when reverse-biased; marked by visible band on package top. |
Key Features
| Feature | Design Value |
|---|---|
| 3.0W peak power capability at TL = +75°C | Enables short-duration surge clamping (e.g., 100ns transients) without thermal runaway. |
| ±5% VZ tolerance | Reduces need for post-assembly trimming in fixed-voltage reference designs. |
| Lead-free, halogen-free, RoHS 3 compliant | Meets IPC-J-STD-609A Class 3 material requirements for green electronics manufacturing. |
| ESD >16kV (HBM) | Eliminates requirement for upstream TVS diodes in handling-sensitive production lines. |
| Moisture sensitivity Level 1 | Permits indefinite dry-pack storage and eliminates bake-out prior to reflow soldering. |
Applications
| DC Power Supply Regulation | Overvoltage Clamp Circuit |
|---|---|
|
Use Scenario: Stabilizing +15V rail in industrial PLC I/O modules where input voltage varies ±10%. IC Role / Device Role / Timing Role: Two-terminal shunt regulator providing precise 15V reference to op-amps and ADCs. Use Value: Maintains <±1% output variation across –40°C to +85°C ambient due to low tempco (≈+5.5mV/°C at 15V). |
Use Scenario: Protecting microcontroller GPIO pins from 24V field wiring transients in factory automation. IC Role / Device Role / Timing Role: Fast-acting clamp limiting pin voltage to 15.75V (VZMAX) during ESD or inductive kick events. Use Value: Absorbs 100A 8/20µs surge pulses per Figure 10, preventing latch-up in 3.3V logic interfaces. |
| Automotive Body Control Module | Test Equipment Reference Source |
|
Use Scenario: Regulating sensor excitation voltage in automotive cabin temperature sensors exposed to cold-cranking conditions. IC Role / Device Role / Timing Role: Zener-based voltage reference for ratiometric bridge sensing, operating from 9–16V battery input. Use Value: Delivers stable 15V output with <0.5% drift over –40°C to +125°C junction range, meeting AEC-Q200 stress requirements. |
Use Scenario: Providing calibrated 15V reference in portable multimeter front-end analog circuitry. IC Role / Device Role / Timing Role: Precision shunt reference replacing higher-cost TL431-based solutions in handheld DMMs. Use Value: Achieves ±0.75V absolute accuracy without calibration, reducing BOM count and test time. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5349B | Same 15V rating but DO-201AD package (larger, axial-leaded); RθJA = 50°C/W vs. 226°C/W. | Requires through-hole mounting and heatsinking for >200mW operation; unsuitable for high-density SMT boards. | Select only when legacy through-hole compatibility or higher single-pulse energy handling is required. |
| BZX84-C15 | 250mW SOT-23 device; VZ = 15V ±5%, but ZZT = 30Ω @ 5mA and RθJA = 350°C/W. | Limited to low-power signal-level clamping; cannot sustain 550mW continuous dissipation. | Use only in space-constrained signal-path protection where power is <100mW. |
Compared with 1N5349B and BZX84-C15, the 1SMB5929B-13 delivers 2.2× higher continuous power density in SMB footprint, 4.5× better thermal resistance than SOT-23, and full automotive-grade temperature range without derating penalties.
Availability
1SMB5929B-13 is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, test equipment references, and factory automation overvoltage protection requiring stable component supply and RoHS-compliant sourcing.
Supply support for 1SMB5929B-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, with operations across Asia, Europe, and the Americas.
This device belongs to the SMB-series 3.0W Zener family designed for high-reliability voltage regulation and transient suppression in space-constrained, high-volume SMT applications.
FAQ
What is the maximum continuous zener current for 1SMB5929B-13 at +75°C ambient?
At +75°C ambient, the device is rated for 3.0W power dissipation. With VZ = 15.0V, the maximum continuous zener current is 200mA (IZM = PD/VZ = 3.0W/15V). This assumes proper PCB copper area per AP02001 layout and terminal temperature ≤+75°C.
Does 1SMB5929B-13 require a series current-limiting resistor in shunt regulation?
Yes - a series resistor is mandatory to limit current to within IZM (600mA peak, 200mA continuous) and prevent thermal runaway. For a 24V input regulating 15V at 100mA load, a 91Ω/1W resistor provides safe bias while maintaining regulation margin.
How does the 15V zener voltage tolerance affect precision reference designs?
The ±5% tolerance (14.25V–15.75V) introduces ±0.75V absolute error. In precision applications, this requires either post-calibration, use of tighter-tolerance variants (e.g., ±2%), or closed-loop feedback to correct for drift - it is not suitable for sub-1% absolute accuracy without compensation.
Can 1SMB5929B-13 replace a 1N4744A in an existing design?
No - the 1N4744A is a 14V/1W DO-41 device with different thermal behavior (RθJA ≈ 75°C/W) and package. Substituting requires verifying PCB pad layout (SMB vs. DO-41), recalculating power derating, and confirming that 15V vs. 14V output meets system tolerance; direct drop-in replacement is not assured.
1SMB5929B-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):
- 15 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 9 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 11.4 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
1SMB5929B-13 FAQ
1.How can I place an order for 1SMB5929B-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5929B-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 1SMB5929B-13 reliable?
The price and inventory of 1SMB5929B-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5929B-13 is usually 5 days.
3.What payment methods are accepted for 1SMB5929B-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5929B-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5929B-13?
1SMB5929B-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5929B-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 1SMB5929B-13?
For technical support, including 1SMB5929B-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5929B-13 requirements.
6.How does Aetrix verify that 1SMB5929B-13 is sourced from the original manufacturer or authorized distributors?
All 1SMB5929B-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 1SMB5929B-13 meets industry standards.
7.What is the process for return or replacement of 1SMB5929B-13?
All 1SMB5929B-13 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5929B-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 1SMB5929B-13 part is unused and in its original packaging.
Return procedure for 1SMB5929B-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5929B-13 Tags
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