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Taiwan Semiconductor Corporation 1SMB5950
- Part No.:
- 1SMB5950
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5950.pdf
- Description:
- DIODE ZENER 110V 3W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,405
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Product details
Overview
1SMB5950 from Taiwan Semiconductor is a surface-mount 3 W Zener diode with nominal zener voltage 110 V, test current 3.4 mA, dynamic impedance 4000 Ω at IZT, maximum DC zener current 13 mA, and junction temperature rating of –55 °C to +150 °C. It serves as a precision voltage reference or overvoltage clamp in DC/DC converter feedback loops and adapter primary-side regulation circuits.
For engineers reviewing the 1SMB5950 datasheet, 1SMB5950 pinout, 1SMB5950 application, or 1SMB5950 equivalent, key selection criteria include its DO-214AA (SMB) package, 5% voltage tolerance, low-inductance glass-passivated junction, and thermal resistance RθJA = 226 °C/W - critical for compact power supply designs requiring stable clamping under transient stress.
Technical Context
The 1SMB5950 operates as a single-die, unidirectional Zener diode optimized for stable DC voltage regulation and transient suppression. Its 110 V nominal breakdown voltage is specified at 3.4 mA test current, with dynamic impedance of 4000 Ω confirming high-impedance behavior typical of high-voltage Zeners.
Thermal performance is defined by RθJL = 25 °C/W (junction-to-lead) and RθJA = 226 °C/W (junction-to-ambient), supporting operation up to 150 °C junction temperature. The device meets J-STD-020 moisture sensitivity level 1 and JESD 201 class 2 whisker resistance requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 104.5–115.5 V @ IZT = 3.4 mA - defines precise clamping threshold for 110 V nominal systems |
| Power Dissipation (PTOT) | 3 W at TL = 75 °C - supports sustained regulation in thermally constrained SMB footprint |
| Zener Impedance (ZZT) | 4000 Ω @ IZT - indicates high dynamic resistance suitable for low-current reference, not low-impedance shunt |
| Leakage Current (IR) | 0.25 μA @ VR = 83.6 V - ensures minimal standby loss in high-impedance bias networks |
| Junction Temperature Range | –55 °C to +150 °C - enables use in industrial and automotive under-hood environments |
| Package | DO-214AA (SMB) - surface-mount outline with cathode band polarity marking and 5 mm × 5 mm Cu-pad thermal pad requirement |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, polarity indicated by cathode band, weight ≈ 0.100 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to lower-potential node in Zener mode | Must be routed to ground or return path when used in reverse-bias regulation configuration |
| Cathode | Current exit terminal during forward bias; connected to higher-potential node in Zener mode | Marked by visible band; connects to regulated rail or clamping point - determines voltage reference polarity |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enables stable long-term VZ drift performance and robustness against humidity-induced degradation |
| Low inductance construction | Minimizes voltage overshoot during fast transients - critical for ESD and surge protection in adapters |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow; compatible with standard SMT assembly without dry-pack handling |
| RoHS and halogen-free compliance | Fulfills IEC 61249-2-21 and environmental directives for consumer and industrial end equipment |
Applications
| Switching Mode Power Supply (SMPS) | AC-DC Adapter |
|---|---|
Use Scenario: Primary-side overvoltage protection in flyback converters using optocoupler feedback. IC Role / Device Role: Zener clamp on auxiliary winding to limit gate drive voltage to controller IC. Use Value: Prevents controller latch-up during output short-circuit by limiting VCC to ≤115.5 V per 1SMB5950 specification. |
Use Scenario: Output voltage reference in isolated buck-derived secondary-side regulation. IC Role / Device Role: Precision voltage reference for TL431-like feedback network where 110 V reference is required. Use Value: Enables accurate 110 V output setpoint with ±5% tolerance and <0.25 μA leakage at 83.6 V. |
| On-board DC/DC Converter | Lighting Application |
Use Scenario: Input rail clamping in 48 V–110 V intermediate bus converters for telecom equipment. IC Role / Device Role: Transient voltage suppressor across input capacitors to absorb line surges. Use Value: Withstands 3 W steady-state dissipation and non-repetitive pulse energy per Fig.10, protecting downstream regulators. |
Use Scenario: Overvoltage protection in LED driver constant-current circuits with high-VOUT configurations. IC Role / Device Role: Zener-based open-load protection that disables driver if output exceeds safe threshold. Use Value: Activates at 104.5 V minimum, ensuring LED string remains within safe operating voltage before catastrophic failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF110A (ON Semiconductor) | Same DO-214AA package; 110 V nominal, 1 W PPP, 1000 W peak pulse rating - lower average power handling | Optimized for surge-only protection, not continuous regulation; lacks 3 W DC dissipation capability | Select SMF110A only for transient suppression; avoid for DC reference or sustained clamping roles |
| BZX84-C110 (Diodes Inc.) | SOT-23 package; 110 V nominal, 300 mW PTOT, 100 Ω ZZT - significantly lower power and higher impedance | Intended for low-current biasing, not power-level clamping; incompatible thermal profile and PCB layout | Use BZX84-C110 only in signal-level circuits; cannot replace 1SMB5950 in power supply rails |
Compared with SMF110A and BZX84-C110, the 1SMB5950 uniquely delivers 3 W continuous DC power dissipation in SMB form factor with verified 4000 Ω dynamic impedance - making it the only viable option for 110 V regulation in space-constrained, thermally demanding power stages.
Availability
1SMB5950 is available at Aetrix Electronics and suitable for switching mode power supplies, AC-DC adapters, and on-board DC/DC converters requiring stable component supply with full traceability and volume scalability.
Supply support for 1SMB5950 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, including Zener diodes, TVS, rectifiers, and MOSFETs, with global distribution and AEC-Q200 qualified lines.
The 1SMB59xx series was designed specifically for surface-mount voltage regulation and transient suppression in compact, high-efficiency power conversion systems - emphasizing thermal reliability, JEDEC-compliant packaging, and tight voltage tolerance.
FAQ
What is the exact zener voltage tolerance for 1SMB5950?
The 1SMB5950 has a ±5% zener voltage tolerance, with minimum, nominal, and maximum values specified as 104.5 V, 110 V, and 115.5 V respectively at IZT = 3.4 mA and TA = 25 °C. This tolerance is confirmed in the Electrical Specifications table on page 2 of the M2102 datasheet revision.
Can 1SMB5950 be used in place of a 100 V Zener diode?
No - the 1SMB5950 is strictly rated for 110 V nominal operation and must not be substituted for 100 V Zeners like 1SMB5948 (91 V) or 1SMB5949 (100 V). Its 104.5–115.5 V range exceeds 100 V system margins and may cause undervoltage lockout or regulation failure in circuits designed for lower thresholds.
What is the maximum allowable DC current for continuous operation of 1SMB5950?
The maximum DC zener current for 1SMB5950 is 13 mA, as listed in the Electrical Specifications table. Exceeding this value risks exceeding the 3 W power limit at elevated ambient temperatures, especially given its RθJA = 226 °C/W thermal resistance.
Does 1SMB5950 meet RoHS and halogen-free standards?
Yes - the 1SMB5950 complies with RoHS Directive 2011/65/EU and is halogen-free per IEC 61249-2-21. These certifications are explicitly stated in the FEATURES section of the M2102 datasheet and verified through TSC's material declarations.
What is the thermal derating behavior of 1SMB5950 above 75 °C lead temperature?
At lead temperature (TL) above 75 °C, the 1SMB5950 derates linearly at 40 mW/°C from its 3 W rated power. This derating applies when mounted on a 5 mm × 5 mm Cu pad per Note 1 in the Absolute Maximum Ratings table - critical for thermal design validation.
1SMB5950 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):
- 110 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 300 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 83.6 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)
1SMB5950 FAQ
1.How can I place an order for 1SMB5950 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5950 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 1SMB5950 reliable?
The price and inventory of 1SMB5950 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5950 is usually 5 days.
3.What payment methods are accepted for 1SMB5950?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5950 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5950?
1SMB5950 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5950 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 1SMB5950?
For technical support, including 1SMB5950 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5950 requirements.
6.How does Aetrix verify that 1SMB5950 is sourced from the original manufacturer or authorized distributors?
All 1SMB5950 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 1SMB5950 meets industry standards.
7.What is the process for return or replacement of 1SMB5950?
All 1SMB5950 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5950, 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 1SMB5950 part is unused and in its original packaging.
Return procedure for 1SMB5950:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5950 Tags
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