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Taiwan Semiconductor Corporation 1SMB5949
- Part No.:
- 1SMB5949
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5949.pdf
- Description:
- DIODE ZENER 100V 3W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,015
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Product details
Overview
1SMB5949 from Taiwan Semiconductor is a 3 W, 100 V nominal Zener diode in DO-214AA (SMB) package, with ±5% voltage tolerance, 3.7 mA test current, and 3100 Ω dynamic impedance at IZT, designed for precision voltage regulation in DC/DC converters and SMPS feedback loops.
For engineers reviewing the 1SMB5949 datasheet, 1SMB5949 pinout, 1SMB5949 application, or 1SMB5949 equivalent, key selection criteria include its 100 V nominal Zener voltage, low leakage (<1 μA at 76 V), thermal resistance of 226 °C/W, and compliance with J-STD-020 level 1 moisture sensitivity.
Technical Context
The 1SMB5949 operates as a single-die, glass-passivated Zener diode optimized for stable reverse-bias voltage reference under DC and transient conditions. Its 100 V nominal Zener voltage is specified at 3.7 mA test current, with a temperature coefficient of +10.5 mV/°C (typical) and maximum junction temperature of +150 °C.
It delivers 3 W power dissipation at lead temperature of 75 °C (derated above), supports surge capability per Fig.2, and exhibits low inductance and low capacitance (<10 pF at zero bias), making it suitable for high-frequency regulation and transient suppression in compact power stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VZ (Nominal) | 100 V - precise DC voltage reference point for feedback networks |
| VZ Range | 95.0–105.0 V - ±5% tolerance ensures predictable clamping/regulation window |
| IZT | 3.7 mA - standardized test current for guaranteed VZ measurement |
| ZZT | 3100 Ω - dynamic impedance defines regulation stiffness under load variation |
| PTOT | 3 W - maximum steady-state power handling at TL = 75 °C on 5 mm × 5 mm Cu pad |
| RθJA | 226 °C/W - thermal resistance determines junction temperature rise in ambient PCB layout |
| IR @ VR = 76 V | <1 μA - ultra-low leakage preserves efficiency in high-impedance bias networks |
Pinout & Package
DO-214AA (SMB) surface-mount package with cathode band marking; two-terminal device (anode and cathode) in axial orientation. Matte tin-plated leads, RoHS-compliant, halogen-free, UL 94V-0 molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / reference ground node | Connected to lower-potential side in Zener configuration; forms return path for regulation current |
| Cathode | Zener breakdown terminal / regulated output node | Marked by band; supplies stable voltage referenced to anode; carries full Zener current during regulation |
Key Features
| Feature | Design Value |
|---|---|
| Glass passivated junction | Ensures long-term stability and reliability under thermal cycling and humidity exposure |
| Moisture sensitivity level 1 | Eliminates need for baking prior to reflow; compatible with standard SMT assembly |
| Low inductance construction | Minimizes voltage overshoot during fast transients, improving clamp response in SMPS |
| J-STD-002 solderability | Guarantees robust wetting and intermetallic formation on matte tin leads |
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: Voltage reference and clamp element in TL431-based or optocoupler-coupled feedback loops. Use Value: Tight 100 V ±5% tolerance enables accurate trip thresholds and stable output regulation across line/load variations. | Use Scenario: Input rail clamping and intermediate bus voltage stabilization in point-of-load (POL) modules. IC Role / Device Role: Standalone Zener reference for error amplifier biasing or undervoltage lockout (UVLO) threshold setting. Use Value: Low 1 μA leakage at 76 V minimizes quiescent current draw in always-on monitoring circuits. |
| Lighting Application | Adapter Circuitry |
Use Scenario: Overvoltage protection for LED driver ICs and string voltage clamping in constant-current LED systems. IC Role / Device Role: Transient suppressor and steady-state voltage limiter across high-voltage LED strings. Use Value: 3 W power rating and 226 °C/W RθJA allow direct PCB mounting without heatsink in space-constrained lighting housings. | Use Scenario: Output voltage regulation and surge suppression in wall-mounted AC/DC adapters for consumer electronics. IC Role / Device Role: Secondary-side shunt regulator and ESD/line-transient clamp in low-cost adapter designs. Use Value: DO-214AA (SMB) footprint enables automated placement and meets IPC Class 2 whisker resistance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5365B | Same 100 V nominal, but 5 W rating, DO-201AD package, higher IZT = 40 mA, ZZT = 1.5 Ω | Higher power handling suits higher-current regulation; larger package requires more board area | Select when >3 W continuous dissipation or lower dynamic impedance is required |
| BZX84-C100 | 100 V nominal, SOT-23 package, 300 mW rating, IZT = 5 mA, ZZT = 2000 Ω | Lower power and smaller footprint ideal for signal-level references, not power-stage clamping | Select only for low-current biasing where SMB thermal performance is unnecessary |
Compared with 1N5365B and BZX84-C100, the 1SMB5949 uniquely balances 3 W power capability, SMB footprint, and 3100 Ω ZZT for cost-sensitive, thermally constrained DC/DC regulation-neither over-specified nor under-rated for mid-power industrial adapters.
Availability
1SMB5949 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 J-STD-020 level 1 assembly compatibility.
Supply support for 1SMB5949 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 and consumer markets.
The 1SMB59xx series was engineered specifically for surface-mount Zener regulation in compact, high-efficiency power conversion systems-emphasizing thermal robustness, assembly reliability, and tight voltage tolerance across wide temperature ranges.
FAQ
What is the nominal Zener voltage and tolerance of the 1SMB5949?
The 1SMB5949 has a nominal Zener voltage of 100 V with a tolerance of ±5%, meaning its actual breakdown voltage falls between 95.0 V and 105.0 V when measured at the specified test current of 3.7 mA. This tolerance is confirmed in the Electrical Specifications table on page 2 of the Taiwan Semiconductor datasheet revision M2102. The 1SMB5949 achieves this accuracy via glass-passivated junction processing and 100% electrical screening.
What is the maximum power dissipation rating for the 1SMB5949 under typical PCB conditions?
The 1SMB5949 is rated for 3 W maximum power dissipation when mounted on a 5 mm × 5 mm copper pad at a lead temperature (TL) of 75 °C, with linear derating above that temperature at 40 mW/°C. At ambient temperature (TA = 25 °C), its power rating drops to 550 mW due to higher thermal resistance to ambient (226 °C/W). These values are defined in the Absolute Maximum Ratings table and validated by the Steady State Power Derating curve (Fig.1).
Does the 1SMB5949 meet RoHS and halogen-free compliance standards?
Yes, the 1SMB5949 is RoHS compliant and halogen-free per IEC 61249-2-21, as explicitly stated in the Features section of the datasheet. Its molding compound meets UL 94V-0 flammability rating, and terminals are matte tin plated to satisfy J-STD-002 solderability requirements. These qualifications apply directly to the 1SMB5949 and are verified for the DO-214AA (SMB) package variant.
What is the Zener impedance (ZZT) of the 1SMB5949 and why does it matter?
The 1SMB5949 has a Zener impedance (ZZT) of 3100 Ω at IZT = 3.7 mA, as listed in the Electrical Specifications table. This value quantifies how tightly the device maintains its Zener voltage under varying current loads - lower ZZT indicates better regulation. For the 1SMB5949, 3100 Ω reflects its optimization for mid-voltage, moderate-current applications where precision outweighs ultra-low impedance needs.
How is polarity indicated on the 1SMB5949, and what is its package type?
Polarity on the 1SMB5949 is indicated by a cathode band printed on the body, consistent with standard diode marking convention. It uses the DO-214AA (SMB) surface-mount package - a rectangular, gull-wing leaded outline measuring 4.57 mm × 3.94 mm × 2.49 mm - documented in Package Outline Dimensions (page 7) and confirmed in the Ordering Information table.
1SMB5949 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):
- 100 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 250 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 76 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)
1SMB5949 FAQ
1.How can I place an order for 1SMB5949 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5949 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 1SMB5949 reliable?
The price and inventory of 1SMB5949 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5949 is usually 5 days.
3.What payment methods are accepted for 1SMB5949?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5949 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5949?
1SMB5949 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5949 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 1SMB5949?
For technical support, including 1SMB5949 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5949 requirements.
6.How does Aetrix verify that 1SMB5949 is sourced from the original manufacturer or authorized distributors?
All 1SMB5949 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 1SMB5949 meets industry standards.
7.What is the process for return or replacement of 1SMB5949?
All 1SMB5949 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5949, 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 1SMB5949 part is unused and in its original packaging.
Return procedure for 1SMB5949:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5949 Tags
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