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Vishay General Semiconductor - Diodes Division SMZG3791B-M3/5B
- Part No.:
- SMZG3791B-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-215AA, SMB Gull Wing
- Datasheet:
-
SMZG3791B-M3/5B.pdf
- Description:
- DIODE ZENER 12V 1.5W DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:6,527
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Product details
Overview
SMZG3791B-M3/5B from Vishay General Semiconductor is a surface-mount, AEC-Q101-qualified Zener diode with nominal Zener voltage of 12 V, 1500 mW power rating, and low dynamic impedance (550 Ω at 7 mA test current), designed for precision voltage regulation and overvoltage protection in automotive and industrial power rails.
For engineers reviewing the SMZG3791B-M3/5B datasheet, SMZG3791B-M3/5B pinout, SMZG3791B-M3/5B application, or SMZG3791B-M3/5B equivalent, key selection factors include its SMBG (DO-215AA) package, 11.4–12.6 V Zener tolerance at 7 mA, 5.0 μA max reverse leakage at 9.1 V, AEC-Q101 qualification, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This device operates as a single-element, glass-passivated Zener diode optimized for stable DC voltage reference and transient clamping. Its 150 °C maximum junction temperature and MSL Level 1 rating support reflow-compatible automated assembly in harsh environments.
The SMZG3791B-M3/5B delivers low regulation factor and low Zener impedance (550 Ω at IZT = 7 mA, 550 Ω at IZK = 0.25 mA), enabling tight voltage control under varying load and temperature conditions typical in automotive body control modules and industrial sensor signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 11.4 V min / 12.0 V nom / 12.6 V max at 7 mA - ensures ±5% regulation window for 12 V rail stabilization |
| Power Dissipation (Ptot) | 1500 mW at TL = 75 °C - supports sustained operation on PCB copper pads without forced cooling |
| Zener Impedance (ZZT) | 550 Ω max at IZT = 7 mA - minimizes output voltage variation under dynamic load changes |
| Reverse Leakage (IR) | 5.0 μA max at VR = 9.1 V - guarantees low standby current in always-on circuits |
| Junction Temperature (TJ) | -55 °C to +150 °C - enables deployment in under-hood automotive and industrial ambient extremes |
| Qualification | AEC-Q101 qualified - validated for automotive electronic systems requiring reliability beyond standard industrial grade |
| Package | SMBG (DO-215AA) - surface-mount footprint compatible with high-speed pick-and-place and reflow soldering |
Pinout & Package
Package: SMBG (DO-215AA), molded case with matte tin-plated leads; cathode indicated by color band; meets UL 94 V-0 flammability rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry terminal during forward bias; reference node for reverse-bias Zener operation | Connected to lower-potential side of regulated circuit; defines polarity for clamping direction |
| Cathode | Current exit terminal during forward bias; Zener voltage reference terminal during reverse bias | Connected to higher-potential side (e.g., supply rail); voltage measured relative to anode |
Key Features
| Feature | Design Value |
|---|---|
| Glass-passivated chip junction | Enhances long-term stability and reduces parameter drift under thermal cycling and humidity stress |
| Low Zener impedance (550 Ω) | Improves regulation accuracy across load transients in feedback loops and reference supplies |
| AEC-Q101 qualification | Validates reliability for automotive applications including engine control units and ADAS power domains |
| Halogen-free, RoHS-compliant (M3 suffix) | Meets environmental compliance requirements for global OEM and Tier-1 manufacturing programs |
| MSL Level 1 (260 °C peak) | Enables single-reflow assembly without moisture sensitivity concerns or baking preconditioning |
Applications
| Automotive Body Control Module (BCM) | Industrial PLC Analog Input Protection |
|---|---|
Use Scenario: Clamping 12 V supply rail against load-dump transients and ESD events in BCM microcontroller power domain. IC Role / Device Role / Timing Role: Zener diode operating in reverse breakdown to clamp voltage excursions above 12.6 V. Use Value: Prevents damage to downstream LDOs and MCU I/O with 5.0 μA leakage ensuring minimal quiescent current draw. | Use Scenario: Protecting 4–20 mA current-loop receiver inputs from field-wiring induced surges. IC Role / Device Role / Timing Role: Precision shunt regulator referenced to analog ground, absorbing excess energy during overvoltage faults. Use Value: Maintains <±5% regulation window (11.4–12.6 V) while surviving repeated 1500 mW pulse dissipation per JEDEC standards. |
| DC-DC Converter Feedback Reference | Smart Sensor Power Rail Stabilization |
Use Scenario: Providing stable 12 V reference for optocoupler-based feedback in isolated flyback converters. IC Role / Device Role / Timing Role: Shunt voltage reference establishing precise error amplifier threshold in secondary-side regulation. Use Value: Low 550 Ω Zener impedance minimizes feedback loop gain variation across temperature and line load. | Use Scenario: Regulating auxiliary 12 V rail powering MEMS pressure sensors and signal-conditioning ASICs. IC Role / Device Role / Timing Role: Primary voltage-regulating element maintaining stable bias for analog front-end circuitry. Use Value: AEC-Q101 qualification and -55 °C to +150 °C operation ensure functional integrity in engine bay sensor nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C12LT1G | 12 V nominal, SOT-23 package, 350 mW Ptot, 30 Ω ZZT at 5 mA | Lower power rating and smaller package limit use to low-current references, not rail clamping | Select when board space is constrained and power dissipation ≤350 mW suffices |
| 1N4742A | 12 V nominal, DO-41 through-hole, 1000 mW Ptot, 9 Ω ZZT at 21 mA | Through-hole mounting and lower power rating preclude automated SMT production and high-energy clamping | Select only for legacy through-hole designs where rework tolerance and cost outweigh SMT efficiency |
Compared with BZX84-C12LT1G and 1N4742A, the SMZG3791B-M3/5B provides 1500 mW power handling in an AEC-Q101-qualified SMBG package-enabling robust, high-volume automotive SMT deployment where both surge immunity and regulatory compliance are mandatory.
Availability
SMZG3791B-M3/5B is available at Aetrix Electronics and suitable for automotive body control modules, industrial programmable logic controllers, and smart sensor power management requiring stable component supply with full AEC-Q101 traceability and halogen-free compliance.
Supply support for SMZG3791B-M3/5B 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 reliability, power efficiency, and automotive-grade qualification.
The SMZG3791B-M3/5B belongs to Vishay's SMZG series of surface-mount Zener diodes engineered specifically for high-reliability voltage regulation and transient suppression in automotive and industrial power systems.
FAQ
What is the Zener voltage tolerance of SMZG3791B-M3/5B at its rated test current?
The SMZG3791B-M3/5B has a Zener voltage range of 11.4 V (minimum) to 12.6 V (maximum) at a test current of 7 mA, yielding a ±5% tolerance around the nominal 12 V value. This specification is verified per the Vishay datasheet revision 25-May-2023, Document Number 88458, and applies strictly to the SMZG3791B-M3/5B variant within the SMZG3788B–SMZG3809B family.
Is SMZG3791B-M3/5B suitable for automotive applications?
Yes, the SMZG3791B-M3/5B is AEC-Q101 qualified, making it suitable for automotive applications including body control modules, infotainment power supplies, and ADAS subsystems. Its -55 °C to +150 °C operating junction temperature range, MSL Level 1 reflow compatibility, and halogen-free M3 suffix meet OEM requirements for under-hood and chassis-mounted electronics.
What does the "M3" suffix indicate in SMZG3791B-M3/5B?
The "M3" suffix in SMZG3791B-M3/5B denotes halogen-free, RoHS-compliant construction with industrial-grade reliability. It distinguishes this variant from E3 (RoHS-compliant, non-halogen-free) and HM3 (AEC-Q101 qualified + halogen-free) versions. The M3 version retains AEC-Q101 qualification per the base family specification and is supplied in 13-inch tape-and-reel (5B packaging).
What is the maximum reverse leakage current for SMZG3791B-M3/5B, and at what voltage is it specified?
The maximum reverse leakage current for SMZG3791B-M3/5B is 5.0 μA, specified at a reverse voltage (VR) of 9.1 V. This value is confirmed in the Electrical Characteristics table of the Vishay datasheet (Document Number 88458), and reflects the device's ability to maintain low standby power in always-on circuits without compromising regulation integrity.
Can SMZG3791B-M3/5B be used as a direct replacement for SMZG3791B-E3/5B?
Yes, SMZG3791B-M3/5B and SMZG3791B-E3/5B share identical electrical specifications, SMBG package, and AEC-Q101 qualification-the only difference is the M3 suffix indicating halogen-free material versus E3's standard RoHS compliance. Both are functionally interchangeable in design; however, M3 is required where halogen-free content is mandated by environmental policy or customer specification.
SMZG3791B-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-215AA, SMB Gull Wing
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 12 V
- Tolerance:
- ±5%
- 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 (SMBG)
SMZG3791B-M3/5B FAQ
1.How can I place an order for SMZG3791B-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMZG3791B-M3/5B 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 SMZG3791B-M3/5B reliable?
The price and inventory of SMZG3791B-M3/5B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMZG3791B-M3/5B is usually 5 days.
3.What payment methods are accepted for SMZG3791B-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMZG3791B-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMZG3791B-M3/5B?
SMZG3791B-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMZG3791B-M3/5B 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 SMZG3791B-M3/5B?
For technical support, including SMZG3791B-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMZG3791B-M3/5B requirements.
6.How does Aetrix verify that SMZG3791B-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMZG3791B-M3/5B 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 SMZG3791B-M3/5B meets industry standards.
7.What is the process for return or replacement of SMZG3791B-M3/5B?
All SMZG3791B-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMZG3791B-M3/5B, 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 SMZG3791B-M3/5B part is unused and in its original packaging.
Return procedure for SMZG3791B-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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