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Taiwan Semiconductor Corporation 1SMB5929
- Part No.:
- 1SMB5929
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5929.pdf
- Description:
- DIODE ZENER 15V 3W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,967
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Product details
Overview
1SMB5929 from Taiwan Semiconductor is a surface-mount Zener diode with nominal zener voltage 15 V, 3 W power rating, 25 Ω dynamic impedance at 25 mA test current, and DO-214AA (SMB) package - used for precision voltage regulation in DC/DC converters and SMPS feedback loops.
For engineers reviewing the 1SMB5929 datasheet, 1SMB5929 pinout, 1SMB5929 application, or 1SMB5929 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (226 °C/W), junction temperature limit (150 °C), and low-inductance SMB package suitability for high-frequency switching environments.
Technical Context
The 1SMB5929 operates as a single-die, glass-passivated Zener diode optimized for stable voltage reference and overvoltage protection in power conversion circuits. Its 15 V nominal zener voltage is specified at 25 mA test current (IZT), with dynamic impedance of 9.0 Ω at IZK = 1 mA and 25.0 Ω at IZT = 25 mA.
It supports continuous DC operation up to 100 mA maximum zener current (IZM), with leakage current ≤ 1 μA at VR = 11.4 V and junction temperature range from –55 °C to +150 °C. Thermal performance includes RθJA = 226 °C/W and RθJL = 25 °C/W under defined PCB mounting conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 14.25–15.75 V @ 25 mA - tight ±5% tolerance enables accurate regulation in feedback networks |
| Power Dissipation (Ptot) | 3 W at TL = 75 °C - requires thermal pad design per 5 mm × 5 mm Cu area for full rating |
| Zener Impedance (ZZT) | 25.0 Ω @ IZT = 25 mA - low dynamic impedance ensures stable output under load transients |
| Leakage Current (IR) | ≤ 1 μA @ VR = 11.4 V - minimal standby loss in low-power hold-up or sensing circuits |
| Junction Temperature (TJ) | –55 °C to +150 °C - suitable for industrial and automotive under-hood ambient conditions |
| Package | DO-214AA (SMB) - surface-mount, RoHS-compliant, moisture sensitivity level 1 |
Pinout & Package
DO-214AA (SMB) package with cathode indicated by band; two-terminal device with anode and cathode leads only.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common or lower-potential rail in reverse-biased regulation mode |
| Cathode | Regulated output node | Provides stable 15 V reference when reverse-biased; marked by visible band on package |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Enhances long-term stability and reliability under thermal cycling and humidity exposure |
| Low inductance construction | Minimizes voltage overshoot during fast transient suppression in switch-mode circuits |
| Moisture sensitivity level 1 | Eliminates bake requirements before reflow; compatible with standard SMT assembly lines |
| Halogen-free & RoHS compliant | Meets IEC 61249-2-21 and EU RoHS directives for environmentally constrained applications |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Regulating feedback voltage in secondary-side synchronous rectifier controllers. IC Role / Device Role / Timing Role: Zener reference for optocoupler-based isolated feedback loop. Use Value: 15 V nominal breakdown enables precise 12 V output regulation with <±1% error across line/load variations. |
Use Scenario: Providing stable bias voltage for gate drivers in point-of-load converters. IC Role / Device Role / Timing Role: Clamp and reference element in bootstrap supply circuitry. Use Value: 25 Ω dynamic impedance maintains regulation accuracy during 10–100 kHz switching transients. |
| Lighting Application | Adapter Circuitry |
Use Scenario: Overvoltage protection for LED driver ICs in constant-current modules. IC Role / Device Role / Timing Role: Transient voltage suppressor and reference clamp for current-sense amplifier rails. Use Value: 3 W power rating absorbs 100 ns–1 ms surges without degradation in 24 V lighting bus systems. |
Use Scenario: Voltage reference in AC/DC adapter feedback divider network. IC Role / Device Role / Timing Role: Precision shunt regulator setting output voltage via optocoupler input current. Use Value: ±5% VZ tolerance ensures output compliance within ±3% over temperature and lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ON Semiconductor 1N5929B | Same 15 V nominal VZ, ±5% tolerance, but rated at 1.5 W (not 3 W); DO-41 package | Limited to lower-power linear regulators; not suitable for 3 W SMPS clamping | Select 1SMB5929 for surface-mount, high-power, low-inductance designs requiring SMB footprint |
| Vishay SZ1SMB5929-B | Identical electrical specs and DO-214AA package; AEC-Q200 qualified for automotive use | Validated for automotive temperature cycling and vibration; higher qualification cost | Choose 1SMB5929 for industrial/white-goods applications where AEC-Q200 is not required |
Compared with 1N5929B and SZ1SMB5929-B, the 1SMB5929 delivers full 3 W dissipation in SMB package with industry-standard moisture sensitivity level 1 - making it optimal for high-volume, thermally constrained SMT power designs without automotive qualification overhead.
Availability
1SMB5929 is available at Aetrix Electronics and suitable for switching mode power supplies, on-board DC/DC converters, and lighting applications requiring stable component supply, consistent parametric performance, and tape-and-reel delivery for automated assembly.
Supply support for 1SMB5929 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, analog ICs, and ESD protection solutions since 1979.
The 1SMB59xx series is part of TSC's high-reliability Zener diode portfolio designed specifically for voltage regulation and transient suppression in compact, high-efficiency power conversion systems.
FAQ
What is the exact zener voltage tolerance for 1SMB5929?
The 1SMB5929 has a nominal zener voltage of 15 V with a guaranteed tolerance of ±5%, meaning the actual VZ falls between 14.25 V and 15.75 V when measured at 25 mA test current and 25 °C ambient. This tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet (Version M2102).
Can 1SMB5929 be used in place of 1N5929B?
No - while both share 15 V nominal zener voltage, the 1SMB5929 is rated for 3 W continuous power in DO-214AA (SMB) package, whereas the 1N5929B is rated for 1.5 W in through-hole DO-41. Substituting 1SMB5929 for 1N5929B requires PCB layout change and offers higher surge capability; direct replacement is not electrically or mechanically compatible.
What is the maximum DC zener current (IZM) for 1SMB5929?
The maximum DC zener current for 1SMB5929 is 100 mA, as specified in the Electrical Specifications table. This value corresponds to the current producing 3 W dissipation at 15 V (P = V × I), and assumes proper thermal management per the 5 mm × 5 mm copper pad requirement for full power rating.
Does 1SMB5929 meet RoHS and halogen-free standards?
Yes - the 1SMB5929 is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the FEATURES section of the Taiwan Semiconductor datasheet. It uses matte tin-plated leads and UL 94V-0 molding compound, satisfying environmental compliance for global commercial and industrial markets.
What is the thermal resistance from junction to ambient (RθJA) for 1SMB5929?
The junction-to-ambient thermal resistance (RθJA) for 1SMB5929 is 226 °C/W, measured under standard JEDEC test conditions (single-layer PCB, no copper pour). This value assumes zero lead length and defines the worst-case thermal path for derating calculations in real-world board layouts.
1SMB5929 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- 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:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1SMB5929 FAQ
1.How can I place an order for 1SMB5929 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5929 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 1SMB5929 reliable?
The price and inventory of 1SMB5929 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5929 is usually 5 days.
3.What payment methods are accepted for 1SMB5929?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5929 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5929?
1SMB5929 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5929 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 1SMB5929?
For technical support, including 1SMB5929 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5929 requirements.
6.How does Aetrix verify that 1SMB5929 is sourced from the original manufacturer or authorized distributors?
All 1SMB5929 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 1SMB5929 meets industry standards.
7.What is the process for return or replacement of 1SMB5929?
All 1SMB5929 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5929, 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 1SMB5929 part is unused and in its original packaging.
Return procedure for 1SMB5929:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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