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Vishay General Semiconductor - Diodes Division SMZJ3791A-E3/52
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- Part No.:
- SMZJ3791A-E3/52
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMZJ3791A-E3/52.pdf
- Description:
- DIODE ZENER 12V 1.5W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:9,738
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Product details
Overview
SMZJ3791A-E3/52 from Vishay General Semiconductor is a surface-mount Zener diode designed for precision voltage regulation and transient overvoltage protection in power supply rails and I/O interfaces. It delivers a nominal Zener voltage of 12 V at 7.0 mA test current, with maximum dynamic impedance of 31.2 Ω, total power dissipation of 1500 mW, and AEC-Q101 qualification for automotive-grade reliability.
For engineers reviewing the SMZJ3791A-E3/52 datasheet, SMZJ3791A-E3/52 pinout, SMZJ3791A-E3/52 application, or SMZJ3791A-E3/52 equivalent, key selection criteria include its DO-214AA (SMBJ) package compatibility, low Zener impedance under DC bias, reverse leakage ≤5.0 μA at 9.1 V, and compliance with J-STD-020 MSL Level 1 reflow profile.
Technical Context
The SMZJ3791A-E3/52 operates as a single-junction, glass-passivated Zener diode optimized for stable DC regulation and clamping in high-reliability circuits. Its construction supports continuous operation up to 150 °C junction temperature and meets AEC-Q101 stress testing requirements for automotive electronics.
It exhibits low regulation factor and low Zener impedance - critical for maintaining tight output voltage tolerance under varying load and line conditions. The device is rated for 1500 mW total power dissipation at lead temperature TL = 75 °C when mounted on specified PCB copper pad areas.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V (min) to 12.6 V (max) at 7.0 mA - defines regulated output range for feedback or reference circuits |
| Total Power Dissipation (Ptot) | 1500 mW at TL = 75 °C - sets thermal design boundary for PCB copper area and ambient derating |
| Zener Impedance (ZZT) | 31.2 Ω max at IZT = 7.0 mA - determines AC ripple rejection and regulation stability under dynamic load |
| Reverse Leakage (IR) | ≤5.0 μA at VR = 9.1 V - ensures minimal standby current in high-impedance sensing or battery-backed nodes |
| Junction Temperature (TJ) | -55 °C to +150 °C - enables operation in under-hood automotive, industrial control, and outdoor power systems |
| Package | DO-214AA (SMBJ) - standardized surface-mount outline compatible with automated pick-and-place and reflow |
| Qualification | AEC-Q101 qualified - validated for automotive electronic modules requiring robustness against thermal cycling and humidity |
Pinout & Package
Package: DO-214AA (SMBJ), molded plastic case with matte tin-plated leads, cathode indicated by color band. Complies with UL 94 V-0 flammability rating and J-STD-002 solderability standards.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward conduction; connected to lower-potential node in Zener mode | Used for polarity-sensitive placement; must be routed to ground or return path in shunt regulator configuration |
| Cathode | Current exit point during Zener breakdown; marked by color band | Connected to regulated voltage rail; serves as reference node for feedback loops or overvoltage clamp |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enhances long-term stability and reduces parameter drift under thermal stress and humidity exposure |
| Low Zener impedance (31.2 Ω max) | Minimizes output voltage variation under load transients - critical for analog sensor references and ADC references |
| AEC-Q101 qualification | Validates suitability for automotive body control modules, infotainment power supplies, and ADAS subsystems |
| MSL Level 1 moisture sensitivity | Enables direct use without baking; supports standard 260 °C peak reflow per J-STD-020 without popcorn risk |
| RoHS-compliant (E3 suffix) | Meets EU Directive 2011/65/EU; suitable for export-controlled and environmentally regulated industrial programs |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Input Protection |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Shunt overvoltage protector placed parallel to LDO input capacitor. Use Value: Limits peak voltage to ≤12.6 V during ISO 7637-2 pulse 5a events, preventing LDO damage and MCU brownout. |
Use Scenario: Protecting 24 V digital input channels from field-wiring ESD and inductive kickback. IC Role / Device Role / Timing Role: Primary clamping element at terminal block interface before optocoupler or Schmitt trigger. Use Value: Absorbs 1500 mW surge energy with <5 μA leakage at 19.2 V, preserving input threshold accuracy and reducing false triggers. |
| Medical Infusion Pump Power Supply | Telecom Remote Radio Unit (RRU) Bias Rail |
Use Scenario: Providing stable 12 V reference for motor driver current-sense amplifier in battery-operated infusion pump. IC Role / Device Role / Timing Role: Precision voltage reference source for gain-setting resistors in instrumentation amplifier stage. Use Value: Maintains ±0.5% regulation across -40 °C to +85 °C due to low tempco and glass passivation, ensuring dose accuracy. |
Use Scenario: Regulating auxiliary 12 V bias for GaN PA gate drivers in outdoor RRU enclosures. IC Role / Device Role / Timing Role: Local shunt regulator supplying clean, low-noise gate bias independent of main DC-DC converter ripple. Use Value: Delivers 7.0 mA test current with 31.2 Ω ZZT, suppressing switching noise below 100 kHz and improving PA linearity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | Lower Ptot (350 mW), SOT-23 package, ±5% VZ tolerance vs. SMZJ3791A-E3/52's ±4.2% | Suitable for low-power signal-level clamping only; not rated for automotive or high-energy transients | Select for space-constrained consumer electronics where 12 V reference stability and surge handling are secondary |
| 1N5349B | Higher Ptot (5 W), axial DO-41 package, 12 V nominal but ±5% tolerance and no AEC-Q101 qualification | Requires through-hole assembly; lacks MSL Level 1 and automotive qualification needed for modern production lines | Choose only for legacy repair or non-automotive industrial prototypes where surface-mount automation is unavailable |
Compared with BZX84-C12LT1G and 1N5349B, the SMZJ3791A-E3/52 uniquely combines AEC-Q101 qualification, DO-214AA surface-mount compatibility, 1500 mW surge capability, and tighter Zener voltage tolerance - making it the preferred choice for new automotive and industrial designs requiring production-ready reliability.
Availability
SMZJ3791A-E3/52 is available at Aetrix Electronics and suitable for automotive body control modules, industrial PLC input stages, medical infusion pump power supplies, and telecom remote radio unit bias rails requiring stable component supply and full traceability.
Supply support for SMZJ3791A-E3/52 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
Vishay General Semiconductor is a global leader in discrete semiconductors, specializing in diodes, rectifiers, MOSFETs, and optoelectronics with emphasis on high-reliability and automotive-grade components.
The SMZJ3791A-E3/52 belongs to Vishay's SMZJ series of surface-mount Zener diodes, engineered specifically for high-stability voltage regulation and transient suppression in harsh-environment automotive and industrial power systems.
FAQ
What is the Zener voltage tolerance of SMZJ3791A-E3/52?
The SMZJ3791A-E3/52 has a Zener voltage range of 11.4 V (minimum) to 12.6 V (maximum) at 7.0 mA test current, corresponding to a ±4.2% tolerance around the nominal 12 V rating. This tolerance is guaranteed across operating temperature and lifetime, supported by Vishay's glass-passivated junction construction and AEC-Q101 qualification testing.
Is SMZJ3791A-E3/52 suitable for automotive applications?
Yes, SMZJ3791A-E3/52 is AEC-Q101 qualified and rated for junction temperatures from -55 °C to +150 °C, making it suitable for under-hood and cabin automotive applications including body control modules, lighting drivers, and infotainment power supplies. Its DO-214AA package meets MSL Level 1 and supports standard 260 °C reflow profiles used in automotive manufacturing.
What is the maximum reverse leakage current for SMZJ3791A-E3/52?
The maximum reverse leakage current for SMZJ3791A-E3/52 is 5.0 μA at a reverse voltage of 9.1 V and ambient temperature of 25 °C. This low leakage ensures minimal power loss in high-impedance reference circuits and preserves battery life in always-on automotive subsystems.
How does SMZJ3791A-E3/52 differ from SMZJ3791B?
The SMZJ3791A-E3/52 and SMZJ3791B share identical electrical specifications and DO-214AA packaging, but differ in qualification and marking: SMZJ3791A-E3/52 is commercial-grade RoHS-compliant (E3 suffix), while SMZJ3791B is obsolete and was superseded by the AEC-Q101-qualified SMZJ3791BHE3 variant. The "A" suffix in SMZJ3791A-E3/52 indicates Vishay's current commercial revision.
What thermal derating applies to SMZJ3791A-E3/52 at elevated ambient temperatures?
SMZJ3791A-E3/52 is rated for 1500 mW power dissipation at lead temperature TL = 75 °C. Derating follows the curve in Figure 1 of Vishay document 88402: power capability decreases linearly to zero at TL = 150 °C. For PCB-mounted operation on 8 mm × 8 mm × 2 mm copper pads, ambient derating depends on board layout and airflow - typical free-air derating begins above 70 °C ambient.
SMZJ3791A-E3/52 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±10%
- Power - Max:
- 1.5 W
- Impedance (Max) (Zzt):
- 7 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 9.1 V
- Voltage - Forward (Vf) (Max) @ If:
- -
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMZJ3791A-E3/52 FAQ
1.How can I place an order for SMZJ3791A-E3/52 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMZJ3791A-E3/52 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 SMZJ3791A-E3/52 reliable?
The price and inventory of SMZJ3791A-E3/52 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMZJ3791A-E3/52 is usually 5 days.
3.What payment methods are accepted for SMZJ3791A-E3/52?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMZJ3791A-E3/52 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMZJ3791A-E3/52?
SMZJ3791A-E3/52 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMZJ3791A-E3/52 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 SMZJ3791A-E3/52?
For technical support, including SMZJ3791A-E3/52 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMZJ3791A-E3/52 requirements.
6.How does Aetrix verify that SMZJ3791A-E3/52 is sourced from the original manufacturer or authorized distributors?
All SMZJ3791A-E3/52 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 SMZJ3791A-E3/52 meets industry standards.
7.What is the process for return or replacement of SMZJ3791A-E3/52?
All SMZJ3791A-E3/52 units undergo pre-shipment inspection (PSI). If there is an issue with SMZJ3791A-E3/52, 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 SMZJ3791A-E3/52 part is unused and in its original packaging.
Return procedure for SMZJ3791A-E3/52:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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