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Taiwan Semiconductor Corporation 1SMB5953
- Part No.:
- 1SMB5953
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1SMB5953.pdf
- Description:
- DIODE ZENER 150V 3W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,055
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Product details
Overview
1SMB5953 from Taiwan Semiconductor is a 3 W, 150 V nominal Zener diode in DO-214AA (SMB) surface-mount package, featuring glass-passivated junction, 2.5 mA test current (IZT), 6000 mA maximum DC zener current (IZM), and 150 °C maximum junction temperature. It regulates voltage in high-voltage DC/DC converters and SMPS feedback loops.
For engineers reviewing the 1SMB5953 datasheet, 1SMB5953 pinout, 1SMB5953 application, or 1SMB5953 equivalent, key selection criteria include its 142.5–157.5 V zener voltage tolerance (±5%), low 2.5 Ω zener impedance at IZT, moisture sensitivity level 1 rating, and RoHS/halogen-free compliance for industrial power designs.
Technical Context
The 1SMB5953 operates as a single-die, unidirectional voltage reference with cathode-band polarity indication. Its 150 V nominal zener voltage is specified at 2.5 mA test current, with dynamic impedance of 2.5 Ω measured at IZT and 6000 Ω at knee current (IZK = 1 mA).
Thermal performance includes 25 °C/W junction-to-lead resistance and 226 °C/W junction-to-ambient resistance (TA = 25 °C). Absolute maximum ratings define 3 W power dissipation at TL = 75 °C with 40 mW/°C derating, and 550 mW at TA = 25 °C with 4.4 mW/°C derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 142.5–157.5 V at 2.5 mA - defines stable regulation window for high-voltage rail sensing |
| Power Dissipation (Ptot) | 3 W at TL = 75 °C - supports continuous operation on thermally optimized PCB pads (5 mm × 5 mm Cu) |
| Zener Impedance (ZZT) | 2.5 Ω @ IZT - ensures minimal output voltage deviation under load transients |
| Max DC Zener Current (IZM) | 10 A - enables robust surge handling in overvoltage clamp circuits |
| Junction Temperature (TJ) | −55 to +150 °C - qualifies for extended industrial ambient conditions |
| Package | DO-214AA (SMB) - surface-mount footprint compatible with automated placement and reflow |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with matte tin-plated leads, cathode indicated by band, weight ≈ 0.100 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias | Connected to lower-potential node in clamping or regulation path |
| Cathode | Current exit terminal during reverse breakdown | Marked with band; connected to regulated voltage rail or error amplifier input |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated junction | Enhances long-term stability and reliability under thermal cycling and humidity exposure |
| Moisture sensitivity level 1 | Eliminates bake requirements before reflow, reducing manufacturing overhead |
| UL 94V-0 molding compound | Meets flame-retardancy standards for safety-critical power supply enclosures |
| Low inductance construction | Minimizes voltage overshoot during fast transient suppression in SMPS snubbers |
Applications
| Switching Mode Power Supply (SMPS) | On-board DC/DC Converter |
|---|---|
Use Scenario: Primary-side overvoltage protection in flyback controllers. IC Role / Device Role / Timing Role: Zener clamp limiting gate drive voltage or feedback reference excursion. Use Value: 150 V rating allows direct monitoring of 120 VAC-derived bus voltages without external scaling. |
Use Scenario: Output voltage regulation in isolated 48 V–12 V buck-derived converters. IC Role / Device Role / Timing Role: Precision reference for optocoupler-based feedback loop. Use Value: ±5% VZ tolerance and low ZZT ensure <±1% output regulation across line/load variations. |
| Lighting Application | Adapter |
Use Scenario: Overvoltage clamp in LED driver constant-current ICs. IC Role / Device Role / Timing Role: Transient suppressor protecting internal reference nodes from mains surges. Use Value: 3 W power rating and 10 A IZM sustain 8/20 μs surge events per IEC 61000-4-5. |
Use Scenario: Secondary-side voltage stabilization in AC/DC wall adapters. IC Role / Device Role / Timing Role: Shunt regulator maintaining auxiliary bias rail for PWM controller. Use Value: SMB package enables compact layout while meeting creepage/clearance requirements for Class II isolation. |
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 1N5953B | Same 150 V nominal VZ, but 1.5 W Ptot and higher ZZT (3.5 Ω); DO-41 through-hole package | Requires PCB redesign for through-hole mounting; unsuitable for high-power density SMT layouts | Select only when legacy through-hole assembly or lower-cost procurement outweighs thermal/power needs |
| Vishay SZ1SMB5953HE3_A/H | Identical 150 V VZ, 3 W rating, and SMB package; tighter 2% VZ tolerance option available | Supports higher-precision regulation where ±2% VZ is required, e.g., medical-grade power supplies | Prefer for new designs demanding tighter voltage accuracy without layout change |
Compared with 1SMB5953, the 1N5953B offers lower cost but sacrifices power handling and SMT compatibility, while the SZ1SMB5953HE3_A/H delivers identical form-factor performance with optional tighter tolerance-making it ideal for precision-sensitive upgrades.
Availability
1SMB5953 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 RoHS-compliant sourcing.
Supply support for 1SMB5953 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 for industrial and consumer markets.
The 1SMB59xx series was designed specifically for high-reliability, surface-mount voltage regulation and transient suppression in compact power conversion systems operating up to 200 V.
FAQ
What is the nominal zener voltage and tolerance of the 1SMB5953?
The 1SMB5953 has a nominal zener voltage of 150 V with a tolerance of ±5%, corresponding to a guaranteed range of 142.5 V to 157.5 V at 2.5 mA test current. This tolerance is defined per the device's marking code "953B" and applies under standard thermal equilibrium conditions at 25 °C ambient temperature.
What is the maximum power dissipation rating for the 1SMB5953 and under what conditions?
The 1SMB5953 is rated for 3 W power dissipation when mounted on a 5 mm × 5 mm copper pad at lead temperature (TL) of 75 °C, with linear derating of 40 mW/°C above that point. At ambient temperature (TA) of 25 °C, its power rating drops to 550 mW, derating at 4.4 mW/°C above 25 °C.
Does the 1SMB5953 meet RoHS and halogen-free compliance standards?
Yes, the 1SMB5953 is RoHS compliant and halogen-free per IEC 61249-2-21. These certifications are confirmed in the official Taiwan Semiconductor datasheet (Version M2102) and apply to all units manufactured under current production lots.
What is the zener impedance of the 1SMB5953 and how is it measured?
The 1SMB5953 exhibits a zener impedance (ZZT) of 2.5 Ω at its 2.5 mA test current (IZT), measured using AC voltage/current at 60 Hz with Iz(AC) = 0.1 × Iz(DC). This low impedance ensures minimal regulation error during dynamic load changes in power supply feedback networks.
What package type does the 1SMB5953 use and what are its key mechanical features?
The 1SMB5953 uses the DO-214AA (SMB) surface-mount package, featuring matte tin-plated leads solderable per J-STD-002, UL 94V-0 flammability-rated molding compound, and cathode polarity indicated by a visible band. Its approximate weight is 0.100 g, and it meets JESD 201 class 2 whisker resistance.
1SMB5953 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):
- 150 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 600 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 114 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)
1SMB5953 FAQ
1.How can I place an order for 1SMB5953 through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMB5953 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 1SMB5953 reliable?
The price and inventory of 1SMB5953 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMB5953 is usually 5 days.
3.What payment methods are accepted for 1SMB5953?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMB5953 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMB5953?
1SMB5953 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMB5953 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 1SMB5953?
For technical support, including 1SMB5953 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMB5953 requirements.
6.How does Aetrix verify that 1SMB5953 is sourced from the original manufacturer or authorized distributors?
All 1SMB5953 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 1SMB5953 meets industry standards.
7.What is the process for return or replacement of 1SMB5953?
All 1SMB5953 units undergo pre-shipment inspection (PSI). If there is an issue with 1SMB5953, 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 1SMB5953 part is unused and in its original packaging.
Return procedure for 1SMB5953:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
1SMB5953 Tags
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