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Taiwan Semiconductor Corporation 1PGSMB5946H
- Part No.:
- 1PGSMB5946H
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
1PGSMB5946H.pdf
- Description:
- DIODE ZENER 75V 3W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:5,382
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Product details
Overview
1PGSMB5946H from Taiwan Semiconductor is a surface-mount silicon Zener diode with nominal zener voltage 75 V, 3 W power rating, 5% tolerance, and DO-214AA (SMB) package. It delivers stable voltage regulation and reference functions in automotive and industrial power supply circuits where precision clamping and thermal robustness up to 175°C junction temperature are required.
For engineers reviewing the 1PGSMB5946H datasheet, 1PGSMB5946H pinout, 1PGSMB5946H application, or 1PGSMB5946H equivalent, key selection criteria include its 71.25–78.75 V zener voltage range at 5 mA test current, 2000 Ω dynamic impedance, 56.0 V maximum DC zener current limit, AEC-Q101 qualification, and moisture sensitivity level 1 handling.
Technical Context
The 1PGSMB5946H operates as a single-die, unidirectional Zener diode optimized for voltage regulation and overvoltage protection in DC power rails. Its photo-glass passivated junction ensures long-term stability under thermal cycling and humidity exposure, while low-inductance SMB packaging supports high-frequency transient suppression.
Designed for automated SMT placement, it meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability standards. The device exhibits 21 °C/W junction-to-lead thermal resistance when mounted on a 10 mm × 10 mm copper pad, enabling reliable 3 W dissipation at TL = 75°C with linear derating above that temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 71.25–78.75 V at IZT = 5.0 mA - defines clamping threshold with ±5% tolerance for stable reference or protection |
| Power Dissipation (Ptot) | 3 W at TL = 75°C - supports continuous regulation in compact PCB layouts with adequate copper thermal relief |
| Zener Impedance (ZZT) | 2000 Ω at IZT = 5.0 mA - indicates moderate AC impedance suitable for low-precision reference but not ultra-low-noise analog references |
| Junction Temperature (TJ) | −55 to +175 °C - enables operation in under-hood automotive and industrial environments without derating penalties |
| Leakage Current (IR) | 1 μA at VR = 56.0 V - confirms effective blocking below zener knee, critical for standby power integrity |
| Package | DO-214AA (SMB) - industry-standard surface-mount outline with cathode band polarity marking and matte tin-plated leads |
Pinout & Package
DO-214AA (SMB) package: molded plastic case with two axial leads, cathode indicated by a painted band; terminals are matte tin-plated for J-STD-002 solderability; weight ≈ 0.100 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Reference ground node | Connected to lower-potential side of regulated rail; forms return path during reverse breakdown |
| Cathode | Zener breakdown terminal / Voltage clamp node | Connected to higher-potential rail; conducts when reverse voltage exceeds 71.25 V, limiting downstream voltage |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualification | Validated for automotive-grade reliability including temperature cycling, HTRB, and ESD testing per stress requirements |
| Photo-glass passivated junction | Prevents moisture ingress and ion migration, ensuring long-term VZ stability in humid or high-bias conditions |
| Moisture Sensitivity Level 1 | No floor-life limitation or baking required before reflow-enables direct use from sealed tape-and-reel packaging |
| Low-inductance SMB package | Minimizes parasitic inductance during fast transient events, improving clamping response time in surge protection |
Applications
| Automotive Power Rail Protection | Industrial DC Reference Source |
|---|---|
Use Scenario: Clamping 12 V/24 V battery-supplied ECUs against load dump transients up to 120 V. IC Role / Device Role / Timing Role: Zener diode acting as primary shunt clamp in parallel with TVS or as secondary regulator after LDO. Use Value: Withstands 3 W peak dissipation and operates reliably from −40°C to +150°C ambient, meeting ISO 7637-2 pulse 5a requirements. | Use Scenario: Providing stable 75 V reference for high-voltage sensor biasing or ADC scaling in PLC analog input modules. IC Role / Device Role / Timing Role: Precision voltage reference element in feedback networks of isolated DC-DC converters or op-amp gain stages. Use Value: 5% tolerance and <1 μA leakage at 56 V ensure minimal drift and loading error in high-impedance reference paths. |
| LED Driver Overvoltage Clamp | Telecom Line Card Surge Suppression |
Use Scenario: Protecting constant-current LED drivers from bus overvoltage due to inductive kickback or supply faults. IC Role / Device Role / Timing Role: Shunt regulator placed across driver output to clamp voltage spikes before they damage LEDs or driver ICs. Use Value: Fast turn-on at 71.25 V and 2000 Ω dynamic impedance limit overshoot to safe levels without oscillation or latch-up. | Use Scenario: Secondary-level protection on 48 V telecom power feeds exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Standby clamping device in series with primary MOV or polymer PPTC, absorbing residual energy after coarse suppression. Use Value: AEC-Q101 qualification and UL 94V-0 molding compound support compliance with GR-1089-CORE safety and fire standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ75A | TVS diode (unidirectional), 75 V standoff, 100 W peak pulse power, higher capacitance (~100 pF) | Designed for transient suppression only-not rated for continuous DC regulation | Select when surge immunity dominates over steady-state regulation; avoid for reference use due to wider VBR tolerance and no DC power rating |
| 1N5364B | Through-hole Zener, 75 V, 5 W, DO-41 package, no AEC-Q101 qualification | Lacks automotive qualification and moisture sensitivity level 1; larger footprint and manual assembly requirement | Choose for cost-sensitive non-automotive prototypes or legacy through-hole designs where reflow compatibility is not needed |
Compared with SMBJ75A and 1N5364B, the 1PGSMB5946H uniquely combines AEC-Q101 qualification, SMB surface-mount compatibility, 3 W continuous DC power handling, and tight 5% VZ tolerance-making it optimal for automotive and industrial voltage reference and regulation where reliability and manufacturability are co-prioritized.
Availability
1PGSMB5946H is available at Aetrix Electronics and suitable for automotive power management, industrial sensor reference circuits, and telecom line card protection requiring stable component supply and full traceability.
Supply support for 1PGSMB5946H 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, including Zener, TVS, rectifier, and MOSFET products for automotive, industrial, and consumer markets.
The 1PGSMB59xxH series was developed to deliver AEC-Q101-qualified, high-voltage Zener diodes in compact SMB packages for next-generation automotive ECUs and ruggedized industrial power supplies.
FAQ
What is the exact zener voltage range specified for 1PGSMB5946H at 5 mA test current?
The 1PGSMB5946H has a nominal zener voltage of 75 V with a minimum of 71.25 V and maximum of 78.75 V at IZT = 5.0 mA, reflecting its ±5% tolerance. This range is measured under thermal equilibrium at 25°C ambient and defines the guaranteed clamping window for design margining in voltage regulation and protection circuits.
Is 1PGSMB5946H qualified for automotive applications?
Yes, the 1PGSMB5946H is AEC-Q101 qualified, meaning it has passed rigorous stress tests including high-temperature reverse bias, temperature cycling, and mechanical shock-specifically intended for use in automotive electronic control units, body electronics, and powertrain subsystems where reliability under harsh environmental conditions is mandatory.
What is the maximum DC zener current rating for 1PGSMB5946H?
The maximum DC zener current (IZM) for 1PGSMB5946H is 20 mA. This value corresponds to the current at which the device reaches its 3 W power limit at the upper end of its zener voltage range (78.75 V), and is used to size series current-limiting resistors in reference or regulation applications.
Does 1PGSMB5946H require baking before reflow soldering?
No, the 1PGSMB5946H has a moisture sensitivity level (MSL) of 1 per J-STD-020, meaning it can be stored indefinitely in dry ambient conditions and placed directly into reflow without pre-baking-reducing manufacturing complexity and eliminating risk of popcorning during soldering.
What is the thermal resistance from junction to ambient for 1PGSMB5946H on a standard PCB?
The junction-to-ambient thermal resistance (RθJA) for 1PGSMB5946H is 59 °C/W when mounted on a standard 10 mm × 10 mm copper pad test board. This value enables accurate thermal modeling for sustained 3 W operation and informs heatsinking decisions in high-power density designs.
1PGSMB5946H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Series:
- 1PGSMB59
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 75 V
- Tolerance:
- ±5%
- Power - Max:
- 3 W
- Impedance (Max) (Zzt):
- 140 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 56 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMB)
1PGSMB5946H FAQ
1.How can I place an order for 1PGSMB5946H through Aetrix?
Please submit a Request for Quotation (RFQ) for 1PGSMB5946H 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 1PGSMB5946H reliable?
The price and inventory of 1PGSMB5946H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 1PGSMB5946H is usually 5 days.
3.What payment methods are accepted for 1PGSMB5946H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 1PGSMB5946H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 1PGSMB5946H?
1PGSMB5946H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 1PGSMB5946H 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 1PGSMB5946H?
For technical support, including 1PGSMB5946H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 1PGSMB5946H requirements.
6.How does Aetrix verify that 1PGSMB5946H is sourced from the original manufacturer or authorized distributors?
All 1PGSMB5946H 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 1PGSMB5946H meets industry standards.
7.What is the process for return or replacement of 1PGSMB5946H?
All 1PGSMB5946H units undergo pre-shipment inspection (PSI). If there is an issue with 1PGSMB5946H, 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 1PGSMB5946H part is unused and in its original packaging.
Return procedure for 1PGSMB5946H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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