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Taiwan Semiconductor Corporation 1SMA5951H
- Part No.:
- 1SMA5951H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
1SMA5951H.pdf
- Description:
- DIODE ZENER 120V 1.5W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,987
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Product details
Overview
1SMA5951H from Taiwan Semiconductor is a 1.5W surface-mount Zener diode with a nominal zener voltage of 120 V, ±5% tolerance, 3.1 mA test current, and 4500 mA maximum DC zener current. It features glass-passivated junction, AEC-Q101 qualification, and DO-214AC (SMA) package - used for precision voltage regulation in automotive-grade DC/DC converters.
For engineers reviewing the 1SMA5951H datasheet, 1SMA5951H pinout, 1SMA5951H application, or 1SMA5951H equivalent, key selection criteria include its 120 V nominal breakdown voltage, low leakage (<0.5 µA at VR = 91.2 V), 150 °C max junction temperature, and suitability for high-reliability power rail clamping in SMPS and lighting systems.
Technical Context
The 1SMA5951H operates as a single-die, unidirectional Zener regulator optimized for stable voltage reference and overvoltage protection in compact power circuits. Its glass-passivated junction ensures robust surge immunity and long-term stability under thermal cycling.
Designed for surface-mount assembly on 5 mm × 5 mm Cu pads, it delivers 1.5 W steady-state dissipation at TL = 75 °C with 20 mW/°C derating above that temperature. The device meets JESD201 Class 2 whisker resistance and JEDEC Class 3B HBM ESD rating (8 kV).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 114.0–126.0 V (nominal 120 V, ±5% tolerance at IZT = 3.1 mA) |
| Power Dissipation (PD) | 1.5 W (derates linearly to zero at 150 °C junction temperature) |
| Test Current (IZT) | 3.1 mA (standard condition for VZ measurement and impedance characterization) |
| Zener Impedance (ZZT) | 360 Ω (dynamic impedance at IZT, impacts regulation accuracy under load variation) |
| Leakage Current (IR) | <0.5 µA at VR = 91.2 V (ensures minimal standby power loss in high-impedance bias networks) |
| Max DC Zener Current (IZM) | 91.2 mA (maximum continuous current before thermal runaway at rated PD) |
| Junction Temperature (TJ) | −55 °C to +150 °C (supports operation in under-hood automotive and industrial environments) |
Pinout & Package
Package: DO-214AC (SMA), surface-mount, single-anode/single-cathode configuration. Cathode indicated by band; matte tin-plated leads, RoHS and halogen-free compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward conduction; reference node for reverse-biased regulation | Connected to lower-potential rail (e.g., ground or return path) when used as shunt regulator |
| Cathode | Current exit terminal during reverse breakdown; zener voltage referenced to this node | Connected to regulated voltage node; polarity marking ensures correct orientation in PCB layout |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive electronics per stress test requirements (HTOL, TCT, ESD, etc.) |
| Glass-passivated chip junction | Enhances moisture resistance and long-term parameter stability vs. epoxy-passivated alternatives |
| Low inductance construction | Minimizes voltage overshoot during fast transient events (e.g., load dump, switching noise) |
| Class 3B HBM ESD rating | Withstands ≥8 kV human-body-model discharge without parametric shift or failure |
| Moisture sensitivity level 1 | No floor-life limitation or bake requirement prior to reflow soldering |
Applications
| Automotive On-Board DC/DC Converter | Industrial LED Driver Protection |
|---|---|
Use Scenario: Regulates auxiliary 12 V rail in vehicle infotainment system DC/DC stage. IC Role / Device Role / Timing Role: Shunt voltage reference and overvoltage clamp for feedback loop integrity. Use Value: Maintains ±5% output accuracy across −40 °C to +125 °C ambient with <0.5 µA leakage at 91.2 V. |
Use Scenario: Protects constant-current LED driver IC against input surge in streetlight modules. IC Role / Device Role / Timing Role: Transient voltage suppressor placed across primary-side bulk capacitor. Use Value: Clamps 100 V transients within 10 ns while sustaining 1.5 W continuous dissipation at 75 °C board temperature. |
| AC-DC Adapter Feedback Network | Switching Mode Power Supply (SMPS) Reference |
Use Scenario: Provides isolated voltage reference for optocoupler-based feedback in 24 V wall adapter. IC Role / Device Role / Timing Role: Precision zener element in secondary-side error amplifier circuit. Use Value: Enables stable 120 V reference with 360 Ω dynamic impedance, minimizing load-regulation error. |
Use Scenario: Sets threshold for overvoltage protection comparator in telecom rectifier module. IC Role / Device Role / Timing Role: Primary sensing element for 120 V rail monitoring and shutdown initiation. Use Value: Delivers repeatable 120 V breakdown with ±5% tolerance and 150 °C junction rating for high-temperature reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5365B | 120 V nominal, 5 W rating, DO-201AD package (larger footprint, higher thermal mass) | Better suited for through-hole prototyping or higher-power derating margin; not AEC-Q101 qualified | Select when board space allows larger package and automotive qualification is not required |
| SMBJ120A | 120 V standoff, 600 W peak pulse power, TVS diode (not regulated Zener; higher leakage, no tight VZ tolerance) | Used for transient suppression only - lacks precision regulation capability of 1SMA5951H | Choose only for surge-only protection; not interchangeable for voltage reference or feedback roles |
Compared with 1SMA5951H, 1N5365B offers higher power headroom but requires PCB redesign and lacks automotive qualification; SMBJ120A provides superior transient handling but cannot replace 1SMA5951H in precision regulation due to absence of tight VZ tolerance and higher leakage.
Availability
1SMA5951H is available at Aetrix Electronics and suitable for automotive DC/DC converters, industrial LED drivers, and AC-DC adapters requiring stable component supply with AEC-Q101 compliance and RoHS/halogen-free assurance.
Supply support for 1SMA5951H 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 automotive-qualified components.
The 1SMA5951H belongs to TSC's AEC-Q101-qualified SMA Zener series, engineered for high-stability voltage regulation in harsh-environment automotive and industrial power systems.
FAQ
What is the zener voltage tolerance of the 1SMA5951H?
The 1SMA5951H has a zener voltage tolerance of ±5%, with a guaranteed range of 114.0 V to 126.0 V at IZT = 3.1 mA and thermal equilibrium. This tolerance is marked on the device as "951A" and applies across the full operating temperature range of −55 °C to +150 °C junction temperature.
Is the 1SMA5951H suitable for automotive applications?
Yes, the 1SMA5951H is AEC-Q101 qualified and tested for automotive-grade reliability, including high-temperature operating life, temperature cycling, and ESD robustness. It is commonly deployed in automotive on-board DC/DC converters and body control modules where 120 V regulation and high-temperature stability are required.
What is the maximum DC zener current for the 1SMA5951H?
The maximum DC zener current (IZM) for the 1SMA5951H is 91.2 mA. This value corresponds to the current at which the device dissipates its full 1.5 W rated power at VZ = 120 V, assuming ideal thermal conditions. Derating is required above 75 °C lead temperature.
Does the 1SMA5951H have a specified leakage current?
Yes, the 1SMA5951H specifies a maximum leakage current (IR) of 0.5 µA at VR = 91.2 V (80% of nominal VZ). This low leakage supports energy-efficient designs in battery-backed or always-on circuits where standby current must be minimized.
What package type does the 1SMA5951H use?
The 1SMA5951H uses the DO-214AC (SMA) surface-mount package - a compact, low-profile outline with matte tin-plated leads, UL 94V-0 molding compound, and polarity indicated by a cathode band. It is optimized for automated placement and reflow soldering per J-STD-002.
1SMA5951H 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):
- 120 V
- Tolerance:
- ±5%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 360 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 91.2 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)
1SMA5951H FAQ
1.How can I place an order for 1SMA5951H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1SMA5951H 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 1SMA5951H reliable?
The price and inventory of 1SMA5951H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1SMA5951H is usually 5 days.
3.What payment methods are accepted for 1SMA5951H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1SMA5951H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1SMA5951H?
1SMA5951H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1SMA5951H 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 1SMA5951H?
For technical support, including 1SMA5951H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1SMA5951H requirements.
6.How does Aetrix verify that 1SMA5951H is sourced from the original manufacturer or authorized distributors?
All 1SMA5951H 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 1SMA5951H meets industry standards.
7.What is the process for return or replacement of 1SMA5951H?
All 1SMA5951H units undergo pre-shipment inspection (PSI). If there is an issue with 1SMA5951H, 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 1SMA5951H part is unused and in its original packaging.
Return procedure for 1SMA5951H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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