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Taiwan Semiconductor Corporation 1SMA5950H
- Part No.:
- 1SMA5950H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5950H.pdf
- Description:
- DIODE ZENER 110V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,569
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Product details
Overview
1SMA5950H from Taiwan Semiconductor is a surface-mount Zener diode rated for 1.5 W power dissipation, with a nominal zener voltage of 110 V (±5%), test current of 3.4 mA, dynamic impedance of 300 Ω at IZT, and maximum DC zener current of 13 mA. It operates across –55°C to +150°C junction temperature and is used for precision voltage regulation in high-voltage DC/DC converters.
For engineers reviewing the 1SMA5950H datasheet, 1SMA5950H pinout, 1SMA5950H application, or 1SMA5950H equivalent, key selection criteria include its DO-214AC (SMA) package, AEC-Q101 qualification, low leakage (<0.5 µA at VR = 83.6 V), glass-passivated junction, and Class 3B HBM ESD rating - all critical for automotive and industrial power supply designs.
Technical Context
The 1SMA5950H functions as a single-die, unidirectional voltage reference device with a tightly controlled 110 V zener breakdown voltage at 3.4 mA. Its 300 Ω dynamic impedance at IZT and 0.25 V maximum knee impedance ensure stable regulation under light-load conditions.
Designed for surface-mount assembly on PCBs with 5 mm × 5 mm copper pads, it features low inductance, matte tin-plated leads compliant with J-STD-002, and meets JESD 201 Class 2 whisker resistance. Polarity is marked by a cathode band, and moisture sensitivity is rated Level 1 per J-STD-020.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 104.5–115.5 V at 3.4 mA - defines precise regulation point for high-voltage feedback loops |
| Power Dissipation (PD) | 1.5 W at TL = 75°C - supports continuous operation in compact power stages with thermal derating |
| Dynamic Impedance (ZZT) | 300 Ω at IZT = 3.4 mA - ensures minimal output voltage variation under load transients |
| Leakage Current (IR) | <0.5 µA at VR = 83.6 V - enables low-power standby regulation without significant quiescent loss |
| Junction Temperature Range | –55°C to +150°C - validated for under-hood automotive and industrial ambient environments |
| ESD Rating | Class 3B (HBM) per JEDEC - withstands ≥8 kV human-body-model discharge without degradation |
| Package | DO-214AC (SMA) - industry-standard SMD outline enabling automated placement and reflow compatibility |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with matte tin-plated leads, cathode indicated by band, weight ≈0.060 g, UL 94V-0 rated compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; connected to lower-potential node in regulation circuit | Provides reference ground path in shunt regulator configuration; must be routed with low-inductance trace |
| Cathode | Current exit terminal during reverse breakdown; connected to regulated voltage node | Serves as voltage-sensing and clamping node; polarity marking ensures correct orientation on PCB |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive-grade reliability including temperature cycling, humidity, and mechanical shock |
| Glass-passivated chip junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure |
| Low inductance construction | Minimizes voltage overshoot during fast transient events in switching power supplies |
| Moisture sensitivity Level 1 | Eliminates need for dry-packaging or baking prior to reflow soldering |
| RoHS and halogen-free compliance | Meets IEC 61249-2-21 and global environmental directives for industrial and automotive manufacturing |
Applications
| Automotive On-Board DC/DC Converter | Industrial SMPS Feedback Loop |
|---|---|
Use Scenario: Regulating auxiliary 12 V rail from 48 V battery in 48 V mild-hybrid vehicles. IC Role / Device Role / Timing Role: Shunt voltage reference in optocoupler-coupled feedback network of isolated flyback controller. Use Value: 110 V rating allows safe operation with 48 V input-derived bias rails; AEC-Q101 qualification ensures functional safety compliance. |
Use Scenario: Providing stable reference for PWM duty-cycle adjustment in 300 W industrial AC/DC front-end. IC Role / Device Role / Timing Role: Precision zener element setting error amplifier threshold in TL431-based secondary-side regulation. Use Value: 300 Ω ZZT maintains tight output tolerance (<±1%) across line/load variations without external compensation. |
| LED Driver Overvoltage Clamp | Telecom Power Supply Protection |
Use Scenario: Clamping transient overvoltage spikes on constant-current LED string outputs in streetlight drivers. IC Role / Device Role / Timing Role: Fast-response voltage clamp placed across output capacitor to limit surge-induced LED damage. Use Value: 1.5 W rating and 10 A IFSM enable absorption of 8.3 ms half-sine surges without failure. |
Use Scenario: Protecting 48 V telecom rectifier modules against lightning-induced surges on distribution bus. IC Role / Device Role / Timing Role: Primary-stage zener limiter in multi-stage protection scheme upstream of TVS arrays. Use Value: Low leakage (<0.5 µA) prevents false triggering during normal 48 V operation while responding within nanoseconds to >100 V transients. |
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-214AC package; 110 V nominal, but 1.0 W PD, higher ZZT (500 Ω), no AEC-Q101 rating | Not suitable for automotive under-hood use; limited to commercial-grade power supplies | Select when cost is prioritized over automotive qualification and thermal headroom is ample |
| BZX84-C110 (Diodes Inc.) | SOT-23 package; 110 V nominal, 300 mW PD, ZZT = 400 Ω, no AEC-Q101 or moisture level certification | Only viable for low-power signal-level regulation, not power-stage clamping or feedback | Choose only for space-constrained non-automotive PCBs where 1.5 W capability is unnecessary |
Compared with SMF110A and BZX84-C110, the 1SMA5950H delivers higher power handling, lower dynamic impedance, and full AEC-Q101 validation - making it the sole option among the three qualified for automotive DC/DC converter feedback and industrial surge-clamp roles requiring sustained 1.5 W dissipation.
Availability
1SMA5950H is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and LED driver overvoltage protection requiring stable component supply and long-term lifecycle support.
Supply support for 1SMA5950H 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 automotive, industrial, and consumer markets.
The 1SMA5950H belongs to TSC's AEC-Q101-qualified SMA Zener series, engineered specifically for high-reliability voltage regulation and transient clamping in automotive power systems and ruggedized industrial power supplies.
FAQ
What is the zener voltage tolerance for 1SMA5950H?
The 1SMA5950H has a zener voltage tolerance of ±5%, with a guaranteed range of 104.5 V to 115.5 V at 3.4 mA test current. This tolerance is specified at thermal equilibrium and applies across the full operating temperature range of –55°C to +150°C. The 1SMA5950H marking code "950A" directly indicates this ±5% grade per Taiwan Semiconductor's ordering convention.
Is 1SMA5950H suitable for automotive applications?
Yes, the 1SMA5950H is AEC-Q101 qualified and designed for automotive use, including under-hood environments. It meets requirements for temperature cycling, mechanical shock, and humidity resistance. Its DO-214AC package, Level 1 moisture sensitivity, and Class 3B HBM ESD rating further support deployment in automotive DC/DC converters and body-control modules where reliability is critical.
What is the maximum DC zener current for 1SMA5950H?
The maximum DC zener current (IZM) for 1SMA5950H is 13 mA, derived from its 1.5 W power rating and nominal 110 V zener voltage (IZM = PD/VZ ≈ 13.6 mA, rounded down per datasheet specification). This value assumes operation at TL = 75°C with proper PCB copper pad thermal management per the 5 mm × 5 mm Cu pad test condition.
Does 1SMA5950H have a glass-passivated junction?
Yes, the 1SMA5950H features a glass-passivated chip junction, as confirmed in the official Taiwan Semiconductor datasheet. This construction improves long-term parameter stability, reduces leakage drift under thermal stress, and enhances resistance to environmental contaminants - a key differentiator versus epoxy-passivated or planar Zener diodes.
What is the thermal derating behavior of 1SMA5950H above 75°C?
The 1SMA5950H derates linearly at 20 mW/°C above 75°C lead temperature (TL). At TL = 100°C, its usable power drops to 1.0 W; at TL = 125°C, it falls to 0.5 W. This derating is defined with the device mounted on a 5 mm × 5 mm copper pad, and actual PCB layout must replicate this thermal path to maintain 1SMA5950H reliability and performance.
1SMA5950H 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):
- 110 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 300 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 83.6 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)
1SMA5950H FAQ
1.How can I place an order for 1SMA5950H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5950H 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 1SMA5950H reliable?
The price and inventory of 1SMA5950H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5950H is usually 5 days.
3.What payment methods are accepted for 1SMA5950H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5950H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5950H?
1SMA5950H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5950H 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 1SMA5950H?
For technical support, including 1SMA5950H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5950H requirements.
6.How does Aetrix verify that 1SMA5950H is sourced from the original manufacturer or authorized distributors?
All 1SMA5950H 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 1SMA5950H meets industry standards.
7.What is the process for return or replacement of 1SMA5950H?
All 1SMA5950H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5950H, 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 1SMA5950H part is unused and in its original packaging.
Return procedure for 1SMA5950H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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