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Vishay General Semiconductor - Diodes Division SMBZ5931B-M3/5B
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- Part No.:
- SMBZ5931B-M3/5B
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-214AA, SMB
- Datasheet:
-
SMBZ5931B-M3/5B.pdf
- Description:
- DIODE ZENER 18V 550MW DO214AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,074
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Product details
Overview
SMBZ5931B-M3/5B from Vishay General Semiconductor is a surface-mount Zener voltage-regulating diode with nominal Zener voltage 18 V, maximum Zener impedance 650 Ω at 12 mA test current, and 550 mW power dissipation at 25 °C ambient - used for precision DC voltage regulation and overvoltage protection in power supply rails and reference circuits.
For engineers reviewing the SMBZ5931B-M3/5B datasheet, SMBZ5931B-M3/5B pinout, SMBZ5931B-M3/5B application, or SMBZ5931B-M3/5B equivalent, key selection criteria include Zener voltage tolerance (±5.5 %), thermal resistance (226 °C/W junction-to-ambient), low-profile SMB (DO-214AA) package compatibility with automated placement, and halogen-free RoHS compliance per M3 suffix.
Technical Context
This device operates as a single-element, silicon planar Zener diode optimized for stable reverse-bias regulation. It delivers 18 V nominal regulation at 12 mA test current with temperature coefficient of +3.5 mV/°C (typical), and maintains regulation down to 0.25 mA knee current (IZK) with 650 Ω dynamic impedance at IZK.
Thermal design requires attention to PCB pad layout per Vishay's minimum recommended footprint, as steady-state power dissipation rises to 3000 mW only at lead temperature TL = 75 °C - not ambient - and junction temperature must remain ≤150 °C under operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 17.1 V min / 18 V nom / 18.9 V max at IZT = 12 mA - defines regulated output voltage range under standard test conditions |
| Zener Impedance (ZZT) | 650 Ω max at IZT = 12 mA - determines AC ripple rejection and load regulation sensitivity |
| Knee Current (IZK) | 0.25 mA - minimum current needed to enter useful regulation region; critical for low-power biasing |
| Power Dissipation (Ptot) | 550 mW at TA = 25 °C - limits continuous DC power in still-air environments without heatsinking |
| Junction Temperature (TJ) | -55 °C to +150 °C - constrains operating envelope in automotive and industrial ambient conditions |
| Thermal Resistance (RθJA) | 226 °C/W - quantifies self-heating rise per watt; requires thermal-aware PCB copper area for reliability |
| Reverse Leakage (IR) | 1 μA max at VR = 13.7 V - ensures minimal standby current in high-impedance sensing or reference paths |
Pinout & Package
Package: SMB (DO-214AA), surface-mount, cathode indicated by color band. Dimensions: 4.06 mm × 3.30 mm × 2.16 mm (L × W × H); matte tin-plated leads, J-STD-002 solderable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal / Zener cathode reference ground | Connected to circuit ground or lower-potential node; forms reference return path during regulation |
| Cathode | Zener breakdown terminal / regulated output node | Connected to input rail; supplies stable 18 V to load when reverse-biased above VZ |
Key Features
| Feature | Design Value |
|---|---|
| Low Zener impedance | 650 Ω max at 12 mA enables tight regulation under varying load currents in feedback references |
| Halogen-free, RoHS-compliant (M3) | Meets IPC-JEDEC J-STD-020 MSL Level 1 (260 °C peak) and JESD201 Class 2 whisker resistance |
| Stable temperature coefficient | +3.5 mV/°C typical minimizes drift across -55 °C to +125 °C operating range |
| Low-profile SMB package | DO-214AA outline supports high-density PCB layouts and automated pick-and-place assembly |
| High surge capability | Rated for 300 μs pulses at 1 % duty cycle - suitable for transient suppression in DC rails |
Applications
| Industrial Power Supply Reference | Automotive ECU Voltage Clamp |
|---|---|
Use Scenario: Stabilizing feedback voltage in isolated flyback converter secondary-side regulation. IC Role / Device Role / Timing Role: Zener diode providing precise 18 V reference to optocoupler LED drive circuit. Use Value: Maintains ±5.5 % output voltage accuracy across line/load/temperature; low ZZT reduces loop gain variation. |
Use Scenario: Clamping 24 V battery-derived rail against load-dump transients in engine control units. IC Role / Device Role / Timing Role: Standby overvoltage protector shunting excess energy to ground during ISO 7637-2 pulse 5a events. Use Value: Withstands 300 μs surges at rated IZM = 83 mA; M3 halogen-free construction meets automotive material compliance. |
| Medical Sensor Biasing | Telecom Line Card Protection |
Use Scenario: Generating stable bias voltage for analog front-end amplifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-leakage (1 μA max) Zener supplying clean 18 V to precision op-amp rails. Use Value: Enables sub-μV noise performance; -55 °C to +150 °C TJ rating supports sterilization and extended field operation. |
Use Scenario: Protecting Ethernet PHY interface ICs from induced surges on PoE-powered line cards. IC Role / Device Role / Timing Role: Secondary-stage clamp after primary TVS, fine-tuning clamping level to 18 V. Use Value: Complements high-power TVS with precise voltage threshold; SMB footprint allows compact dual-stage layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener voltage regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BZX84-C18LT1G | 18 V nominal, SOT-23 package, 350 mW Ptot at 25 °C, ZZT = 40 Ω max at 5 mA | Lower power and smaller footprint; unsuitable for >350 mW continuous dissipation | Select for space-constrained low-power biasing where thermal margin is adequate |
| 1N4746A | 18 V nominal, DO-41 through-hole, 1000 mW Ptot, ZZT = 20 Ω max at 21 mA | Higher power and lower impedance but incompatible with SMT assembly and automated production | Select only for prototyping or legacy through-hole designs requiring higher surge robustness |
Compared with BZX84-C18LT1G and 1N4746A, SMBZ5931B-M3/5B offers optimal balance of SMT manufacturability, 550 mW ambient-rated power, and 650 Ω Zener impedance - making it preferred for mid-power industrial and automotive modules requiring RoHS/halogen-free compliance and DO-214AA board space efficiency.
Availability
SMBZ5931B-M3/5B is available at Aetrix Electronics and suitable for industrial power supply reference, automotive ECU voltage clamp, and medical sensor biasing requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for SMBZ5931B-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 for high-reliability industrial, automotive, and computing applications.
The SMBZ59xxB series is designed specifically for surface-mount Zener regulation in space-constrained, thermally demanding environments - emphasizing low-profile packaging, MSL Level 1 reflow compatibility, and stable voltage reference performance across wide temperature ranges.
FAQ
What is the Zener voltage tolerance of SMBZ5931B-M3/5B?
The SMBZ5931B-M3/5B has a Zener voltage range of 17.1 V (minimum) to 18.9 V (maximum) at 12 mA test current, corresponding to a ±5.5 % tolerance around the nominal 18 V rating. This tolerance is guaranteed across the full operating temperature range and is measured under standardized pulse conditions per Vishay Document 89418.
Can SMBZ5931B-M3/5B be used in automotive applications?
Yes, SMBZ5931B-M3/5B is qualified for automotive use: it operates from -55 °C to +150 °C junction temperature, meets JESD201 Class 2 whisker resistance, and carries halogen-free RoHS compliance (M3 suffix). Its 300 μs surge rating and stable 18 V regulation make it suitable for ECU voltage clamping and sensor biasing per AEC-Q101 stress test guidelines.
What is the maximum DC Zener current (IZM) for SMBZ5931B-M3/5B?
The maximum DC Zener current for SMBZ5931B-M3/5B is 83 mA, calculated from Ptot = 550 mW at TA = 25 °C and VZ ≈ 18 V. This value assumes no additional heatsinking and must be derated linearly above 25 °C ambient using RθJA = 226 °C/W to maintain TJ ≤ 150 °C.
How does the SMBZ5931B-M3/5B differ from the E3-suffix version?
The SMBZ5931B-M3/5B uses halogen-free molding compound and matte tin plating meeting JESD201 Class 2 whisker requirements, while the E3-suffix variant is RoHS-compliant but not halogen-free. Both share identical electrical specs and SMB package dimensions, but M3 is required for strict halogen-free compliance in aerospace and certain automotive supply chains.
Is SMBZ5931B-M3/5B compatible with lead-free reflow soldering?
Yes, SMBZ5931B-M3/5B is rated for MSL Level 1 per J-STD-020 with a maximum peak reflow temperature of 260 °C, fully compatible with standard lead-free (SnAgCu) reflow profiles. The matte tin-plated leads meet J-STD-002 solderability requirements, and the package withstands multiple reflow cycles without degradation.
SMBZ5931B-M3/5B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- DO-214AA, SMB
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Voltage - Zener (Nom) (Vz):
- 18 V
- Tolerance:
- ±2%
- Power - Max:
- 550 mW
- Impedance (Max) (Zzt):
- 12 Ohms
- Current - Reverse Leakage @ Vr:
- 1 µA @ 13.7 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AA (SMBJ)
SMBZ5931B-M3/5B FAQ
1.How can I place an order for SMBZ5931B-M3/5B through Aetrix?
Please submit a Request for Quotation (RFQ) for SMBZ5931B-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 SMBZ5931B-M3/5B reliable?
The price and inventory of SMBZ5931B-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 SMBZ5931B-M3/5B is usually 5 days.
3.What payment methods are accepted for SMBZ5931B-M3/5B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMBZ5931B-M3/5B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMBZ5931B-M3/5B?
SMBZ5931B-M3/5B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMBZ5931B-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 SMBZ5931B-M3/5B?
For technical support, including SMBZ5931B-M3/5B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMBZ5931B-M3/5B requirements.
6.How does Aetrix verify that SMBZ5931B-M3/5B is sourced from the original manufacturer or authorized distributors?
All SMBZ5931B-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 SMBZ5931B-M3/5B meets industry standards.
7.What is the process for return or replacement of SMBZ5931B-M3/5B?
All SMBZ5931B-M3/5B units undergo pre-shipment inspection (PSI). If there is an issue with SMBZ5931B-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 SMBZ5931B-M3/5B part is unused and in its original packaging.
Return procedure for SMBZ5931B-M3/5B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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