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Taiwan Semiconductor Corporation 1SMA5935
- Part No.:
- 1SMA5935
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5935.pdf
- Description:
- DIODE ZENER 27V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,783
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Product details
Overview
1SMA5935 from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with a nominal zener voltage of 27V (±5%), 13.9Ω dynamic impedance at 23mA test current, and maximum leakage current of 0.5µA at 20.6V. It operates from −55°C to +150°C and is used for voltage regulation in DC/DC converters and power supply feedback loops.
For engineers reviewing the 1SMA5935 datasheet, 1SMA5935 pinout, 1SMA5935 application, or 1SMA5935 equivalent, key selection criteria include its DO-214AC (SMA) package, 27V regulation tolerance, thermal derating above 75°C, and Class 3B HBM ESD rating - all critical for compact, high-reliability power management designs.
Technical Context
The 1SMA5935 functions as a single-die, glass-passivated Zener diode optimized for stable voltage reference and overvoltage clamping in low-inductance SMT layouts. Its 13.9Ω zener impedance at 23mA and 0.25V maximum knee voltage ensure tight regulation under varying load conditions.
Designed for operation up to 150°C junction temperature, it features a cathode-band polarity indicator, matte tin-plated leads compliant with J-STD-002, and meets JEDEC JESD201 Class 2 whisker resistance and J-STD-020 Level 1 moisture sensitivity requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 27 V ±5% - defines precise regulation point for feedback networks |
| IZT | 23 mA - test current at which VZ and ZZT are guaranteed |
| ZZT | 13.9 Ω - low dynamic impedance ensures minimal output voltage variation with load changes |
| PD | 1.5 W - maximum steady-state power dissipation at TL = 75°C |
| IR @ VR | 0.5 µA at 20.6 V - ultra-low leakage preserves efficiency in high-impedance bias circuits |
| TJ max | +150 °C - enables use in thermally constrained industrial and automotive power stages |
| Package | DO-214AC (SMA) - industry-standard SMT outline with 5 mm × 5 mm Cu pad thermal requirement |
Pinout & Package
DO-214AC (SMA) package: surface-mount, molded plastic case with cathode band marking; terminals are anode and cathode; polarity indicated by single black band on cathode end; weight ≈ 0.060 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Reference ground node | Connected to circuit common or ground in reverse-biased regulation configuration |
| Cathode | Zener voltage output node | Provides regulated 27V output when reverse-biased; marked by black band |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Ensures long-term stability and reliability under thermal cycling and humidity exposure |
| Class 3B HBM ESD rating | Withstands ≥8 kV human-body-model discharge without parameter shift or failure |
| Low inductance construction | Minimizes voltage overshoot during transient clamping in fast-switching SMPS |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive for environmentally restricted markets |
| Moisture sensitivity level 1 | Zero bake requirement before reflow - supports standard SMT assembly without preconditioning |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Primary-side overvoltage protection and secondary-side feedback reference in isolated flyback converters. IC Role / Device Role / Timing Role: Zener reference diode providing stable 27V clamp for TL431 bias or optocoupler LED drive. Use Value: Tight 27V ±5% tolerance and 13.9Ω impedance maintain feedback accuracy across line/load variations. | Use Scenario: Voltage regulation in point-of-load (POL) converters for FPGA or microprocessor core supplies. IC Role / Device Role / Timing Role: Precision shunt regulator establishing reference for adjustable buck controller feedback divider. Use Value: Ultra-low 0.5µA leakage at 20.6V prevents loading error in high-resistance feedback networks. |
| Lighting Application | Adapter |
Use Scenario: Overvoltage clamping in LED driver constant-current circuits with wide input range. IC Role / Device Role / Timing Role: Transient voltage suppressor protecting LED string drivers from surge-induced breakdown. Use Value: 1.5W power rating and 10A peak surge capability (IFSM) handle repetitive line transients. | Use Scenario: Output voltage stabilization in wall-mounted AC/DC adapters for consumer electronics. IC Role / Device Role / Timing Role: Secondary-side zener clamp regulating auxiliary winding feedback voltage. Use Value: DO-214AC package enables automated placement and low-profile layout in space-constrained adapter PCBs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MMBZ5255B | 300 mW SOT-23 package; 27V ±5%; higher ZZT (35 Ω @ 20 mA) | Lower power handling limits use to signal-level or low-current biasing only | Select when board space is critical and power dissipation ≤300 mW |
| 1N4733A | 1W through-hole DO-41; 27V ±5%; ZZT = 13 Ω @ 23 mA; no Class 3B ESD rating | Requires manual insertion or wave soldering; unsuitable for high-reliability automated production | Select only for legacy through-hole designs where rework tolerance outweighs SMT efficiency |
Compared with MMBZ5255B and 1N4733A, the 1SMA5935 delivers 1.5W power handling in a surface-mount DO-214AC package with verified Class 3B ESD robustness and moisture level 1 - making it optimal for volume-manufactured, thermally demanding power regulation tasks.
Availability
1SMA5935 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 full traceability across production batches.
Supply support for 1SMA5935 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 protection components for industrial, computing, and consumer markets.
The 1SMA59xx series is part of TSC's high-reliability Zener diode product line, engineered specifically for precision voltage regulation and transient suppression in compact, high-efficiency power conversion systems.
FAQ
What is the zener voltage tolerance for 1SMA5935?
The 1SMA5935 has a nominal zener voltage of 27 V with a tolerance of ±5%, meaning the actual VZ falls between 25.65 V and 28.35 V at 23 mA test current under thermal equilibrium conditions, as specified in the Taiwan Semiconductor datasheet revision L2102.
Does 1SMA5935 support automated SMT assembly?
Yes, the 1SMA5935 uses a DO-214AC (SMA) package with matte tin-plated leads that meet J-STD-002 solderability requirements and is explicitly rated for automated placement. Its low-profile design and Level 1 moisture sensitivity eliminate pre-bake steps in standard reflow processes.
What is the maximum junction temperature rating for 1SMA5935?
The 1SMA5935 is rated for a maximum junction temperature (TJ) of +150°C and a storage temperature range of −55°C to +150°C. This allows reliable operation in high-temperature environments such as enclosed power supplies or under-hood automotive modules.
How does the 1SMA5935 compare to older through-hole Zeners like 1N4733A?
The 1SMA5935 offers identical 27V regulation but in a surface-mount DO-214AC package with 1.5W power rating (vs. 1W for 1N4733A), Class 3B ESD rating, and J-STD-020 Level 1 moisture sensitivity - enabling higher reliability and automated manufacturing not possible with the legacy 1N4733A.
Is 1SMA5935 halogen-free and RoHS compliant?
Yes, the 1SMA5935 is both RoHS compliant and halogen-free per IEC 61249-2-21. The molding compound meets UL 94V-0 flammability rating, and all materials are certified for environmentally restricted markets including the EU and China RoHS.
1SMA5935 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 27 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 20.6 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA5935 FAQ
1.How can I place an order for 1SMA5935 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5935 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 1SMA5935 reliable?
The price and inventory of 1SMA5935 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5935 is usually 5 days.
3.What payment methods are accepted for 1SMA5935?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5935 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5935?
1SMA5935 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5935 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 1SMA5935?
For technical support, including 1SMA5935 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5935 requirements.
6.How does Aetrix verify that 1SMA5935 is sourced from the original manufacturer or authorized distributors?
All 1SMA5935 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 1SMA5935 meets industry standards.
7.What is the process for return or replacement of 1SMA5935?
All 1SMA5935 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5935, 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 1SMA5935 part is unused and in its original packaging.
Return procedure for 1SMA5935:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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