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Taiwan Semiconductor Corporation 1SMA5955H
- Part No.:
- 1SMA5955H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5955H.pdf
- Description:
- DIODE ZENER 180V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:6,286
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Product details
Overview
1SMA5955H from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with nominal zener voltage 180 V, test current 2.1 mA, dynamic impedance 900 Ω at IZT, maximum DC zener current 8 mA, and junction temperature range −55°C to +150°C. It is AEC-Q101 qualified and used for overvoltage protection in on-board DC/DC converters.
For engineers reviewing the 1SMA5955H datasheet, 1SMA5955H pinout, 1SMA5955H application, or 1SMA5955H equivalent, key selection criteria include its 180 V ±5% zener tolerance, low leakage (<0.5 µA at VR = 136.8 V), DO-214AC (SMA) package compatibility with automated placement, and Class 3B HBM ESD rating.
Technical Context
The 1SMA5955H operates as a single-die, glass-passivated Zener diode optimized for stable voltage regulation under reverse-bias conditions. Its 900 Ω dynamic impedance at 2.1 mA and 0.25 Ω knee impedance at 0.25 mA support precise clamping in high-impedance sensing and feedback paths.
Designed for automotive-grade reliability, it meets AEC-Q101 stress requirements and features moisture sensitivity level 1 per J-STD-020. The device exhibits <0.5 µA leakage above 136.8 V and maintains regulation across −55°C to +150°C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 171–189 V (±5% tolerance at 2.1 mA; ensures stable reference in high-voltage feedback loops) |
| Power Dissipation (PD) | 1.5 W (derates linearly above 75°C; supports continuous operation in compact power stages) |
| Test Current (IZT) | 2.1 mA (standard bias point for VZ measurement; enables low-current regulation) |
| Dynamic Impedance (ZZT) | 900 Ω (measured at IZT; defines voltage variation under load transients) |
| Leakage Current (IR) | <0.5 µA at 136.8 V (ensures minimal standby power loss in high-impedance circuits) |
| Junction Temperature (TJ) | −55°C to +150°C (supports deployment in under-hood automotive and industrial environments) |
| ESD Rating | Class 3B per JEDEC JESD22-A114 (withstands ≥8 kV HBM; suitable for handling in unshielded assembly lines) |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, low-profile, cathode indicated by band. Weight: 0.060 g. Molding compound meets UL 94V-0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to lower-potential node in shunt regulation; forms return path for leakage and regulation current |
| Cathode | Zener breakdown terminal / voltage clamp input | Connected to protected node; conducts when voltage exceeds 171–189 V, diverting surge current to ground |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics including engine control units and ADAS power rails |
| Glass passivated junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity stress |
| Low inductance construction | Minimizes voltage overshoot during fast transient suppression (e.g., load dump events) |
| Matte tin-plated leads | Ensures reliable solderability per J-STD-002 and eliminates whisker growth risk (JESD201 Class 2) |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and EU RoHS Directive 2011/65/EU for environmentally constrained designs |
Applications
| Automotive On-Board DC/DC Converters | Industrial SMPS Feedback Networks |
|---|---|
Use Scenario: Voltage regulation and overvoltage clamping in 48 V–400 V isolated DC/DC modules for ADAS domain controllers. IC Role / Device Role / Timing Role: Shunt regulator providing precise 180 V reference and transient suppression at secondary-side feedback node. Use Value: Maintains ±5% output accuracy under thermal stress while surviving 10 A surge pulses per IEC 61000-4-5. |
Use Scenario: Secondary-side voltage sensing in telecom rectifiers and programmable logic controller (PLC) power supplies. IC Role / Device Role / Timing Role: Zener reference element in optocoupler-coupled feedback loop for isolation barrier integrity. Use Value: Enables stable 180 V setpoint with <0.5 µA leakage, minimizing quiescent error in high-impedance divider networks. |
| LED Driver Overvoltage Protection | High-Voltage Sensor Interface Clamping |
Use Scenario: Clamp circuit protecting constant-current LED drivers from bus transients in streetlight and stadium lighting systems. IC Role / Device Role / Timing Role: Fast-acting shunt limiter placed across output capacitor to absorb energy during open-load or short-circuit recovery. Use Value: Limits peak voltage to ≤189 V with 900 Ω dynamic impedance, preventing MOSFET gate oxide failure in driver ICs. |
Use Scenario: Input protection for 200 V-range analog front-ends in battery management systems and HV motor controllers. IC Role / Device Role / Timing Role: Primary overvoltage guard before precision ADC input, absorbing ESD and switching spikes. Use Value: Provides Class 3B ESD immunity and <0.5 µA leakage at 136.8 V, preserving signal integrity without loading sensor outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMF180A (ON Semiconductor) | Same DO-214AC package; 180 V nominal, but ±10% tolerance and higher IR (1 µA @ 144 V) | Lacks AEC-Q101 qualification; rated for general industrial use only | Select when cost sensitivity outweighs automotive qualification and tighter leakage requirements |
| BZX84-C180 (Nexperia) | SOT-23 package (not DO-214AC); 180 V ±5%, but PD = 350 mW and IZM = 2.2 mA | Not suitable for 1.5 W power dissipation; limited to low-power signal-level clamping | Choose only for space-constrained PCBs where thermal budget permits derating to 350 mW |
Compared with SMF180A and BZX84-C180, the 1SMA5955H delivers automotive-grade reliability, full 1.5 W capability in SMA packaging, and superior leakage performance-making it the sole option for AEC-Q101-compliant, high-voltage, high-power shunt regulation.
Availability
1SMA5955H is available at Aetrix Electronics and suitable for automotive power conversion, industrial SMPS design, and high-voltage LED driver protection requiring stable component supply and long-term lifecycle assurance.
Supply support for 1SMA5955H 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, TVS diodes, and Zener regulators for automotive and industrial markets.
The 1SMA59xxH series was developed to deliver AEC-Q101-qualified, high-voltage Zener regulation in standard SMA packages-targeting next-generation EV power electronics and ruggedized industrial power supplies.
FAQ
What is the zener voltage tolerance of the 1SMA5955H?
The 1SMA5955H has a zener voltage tolerance of ±5%, with guaranteed limits of 171 V (min) and 189 V (max) at 2.1 mA test current. This tolerance is confirmed in the Electrical Specifications table of the official Taiwan Semiconductor datasheet Version A2102 and applies under thermal equilibrium conditions.
Is the 1SMA5955H suitable for automotive applications?
Yes, the 1SMA5955H is AEC-Q101 qualified and explicitly designed for automotive use. It passes stress tests including high-temperature operating life, temperature cycling, and unbiased highly accelerated stress testing-making it appropriate for under-hood power modules and ADAS subsystems where the 1SMA5955H provides robust overvoltage clamping.
What is the maximum DC zener current rating for the 1SMA5955H?
The maximum DC zener current (IZM) for the 1SMA5955H is 8 mA, derived from its 1.5 W power rating and nominal 180 V zener voltage (IZM = PD/VZ ≈ 8.3 mA, rounded down to 8 mA per datasheet specification). This value ensures safe continuous operation within thermal limits.
Does the 1SMA5955H have a specified leakage current?
Yes, the 1SMA5955H specifies a maximum leakage current (IR) of 0.5 µA at 136.8 V (80% of nominal VZ). This low leakage is critical for high-impedance feedback networks and is measured per JEDEC standards, confirming minimal standby power loss in precision regulation circuits using the 1SMA5955H.
What package type does the 1SMA5955H use?
The 1SMA5955H uses the DO-214AC (SMA) surface-mount package, with matte tin-plated leads compliant with J-STD-002 solderability requirements and JESD201 Class 2 whisker resistance. Its low-profile form factor supports automated placement and meets UL 94V-0 flammability standards-key attributes of the 1SMA5955H's mechanical design.
1SMA5955H 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):
- 180 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 900 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 136.8 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
1SMA5955H FAQ
1.How can I place an order for 1SMA5955H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5955H 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 1SMA5955H reliable?
The price and inventory of 1SMA5955H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5955H is usually 5 days.
3.What payment methods are accepted for 1SMA5955H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5955H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5955H?
1SMA5955H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5955H 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 1SMA5955H?
For technical support, including 1SMA5955H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5955H requirements.
6.How does Aetrix verify that 1SMA5955H is sourced from the original manufacturer or authorized distributors?
All 1SMA5955H 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 1SMA5955H meets industry standards.
7.What is the process for return or replacement of 1SMA5955H?
All 1SMA5955H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5955H, 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 1SMA5955H part is unused and in its original packaging.
Return procedure for 1SMA5955H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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