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Vishay General Semiconductor - Diodes Division SMPZ3936B-E3/85A
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- Part No.:
- SMPZ3936B-E3/85A
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- Single Zener Diodes
- Package:
- DO-220AA
- Datasheet:
-
SMPZ3936B-E3/85A.pdf
- Description:
- DIODE ZENER 30V 500MW DO220AA
- Quantity:
- Payment:
- Shipping:
Inventory:7,398
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Product details
Overview
SMPZ3936B-E3/85A from Vishay General Semiconductor is a surface-mount Zener diode with nominal Zener voltage of 30 V, 12.5 Ω maximum Zener impedance at 26 mA test current, 500 mW power dissipation at 25 °C, and DO-220AA (SMP) package for precision voltage regulation in compact power supply rails.
For engineers reviewing the SMPZ3936B-E3/85A datasheet, SMPZ3936B-E3/85A pinout, SMPZ3936B-E3/85A application, or SMPZ3936B-E3/85A equivalent, key selection criteria include Zener voltage tolerance (±5 %), thermal resistance (250 °C/W junction-to-ambient), MSL level 1 rating, and low-profile 1.0 mm height for high-density PCB layouts.
Technical Context
This device operates as a single-element, cathode-banded Zener regulator optimized for stable DC voltage reference and overvoltage protection. It delivers 30 V regulation with ±5 % tolerance at 26 mA test current and maintains low dynamic impedance (≤12.5 Ω) to minimize output variation under load transients.
Designed for surface-mount assembly on standard PCB copper pads (5.0 mm × 5.0 mm per terminal), it supports reflow soldering up to 260 °C peak temperature (MSL level 1), features matte tin-plated leads compliant with J-STD-002, and uses UL 94 V-0 molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 28.5 V min / 30 V nom / 31.5 V max - defines regulated output range under 26 mA test current |
| Power Dissipation (Ptot) | 500 mW at 25 °C - sets maximum continuous DC power handling on standard PCB layout |
| Zener Impedance (ZZT) | ≤12.5 Ω at IZT = 26 mA - ensures tight regulation during load changes |
| Reverse Leakage Current | ≤0.5 μA at VR = 22.8 V - guarantees minimal standby power loss in high-impedance bias networks |
| Junction Temperature Range | -65 °C to +150 °C - enables operation in industrial and automotive under-hood environments |
| Thermal Resistance (RθJA) | 250 °C/W - determines temperature rise above ambient at given power dissipation |
Pinout & Package
Package: SMP (DO-220AA), 2-terminal surface-mount case with cathode band marking; dimensions: 3.61 mm × 2.18 mm × 1.0 mm (L × W × H); weight: 24 mg; UL 94 V-0 molding compound; MSL level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node in reverse-biased Zener configuration; carries forward current ≤200 mA |
| Cathode | Zener breakdown terminal | Marked by color band; connected to higher-potential node; sustains 30 V reverse regulation with low dynamic impedance |
Key Features
| Feature | Design Value |
|---|---|
| Low profile height | 1.0 mm typical - enables use in ultra-thin consumer and portable electronics assemblies |
| Low Zener impedance | 12.5 Ω max at 26 mA - improves regulation accuracy under varying load conditions |
| Halogen-free & RoHS-compliant | M3 suffix variant - meets industrial-grade environmental compliance requirements |
| MSL level 1 rating | Peak reflow temperature 260 °C for 10 s - supports standard lead-free SMT processes without preconditioning |
Applications
| Industrial Power Supply Regulation | Automotive ECU Reference Voltage |
|---|---|
Use Scenario: Stabilizing 3.3 V or 5 V auxiliary rails in programmable logic controllers and sensor interface modules. IC Role / Device Role / Timing Role: Zener diode providing precise 30 V reference for feedback divider networks in isolated DC-DC converters. Use Value: Maintains ±5 % regulation across -40 °C to +125 °C ambient, enabling reliable feedback loop stability without active compensation. | Use Scenario: Clamping transient surges on 12 V battery-supplied microcontroller I/O lines in engine control units. IC Role / Device Role / Timing Role: Overvoltage protection element shunting spikes >31.5 V to ground before reaching sensitive CMOS inputs. Use Value: Sub-1.0 mm height allows placement adjacent to BGA-packaged MCUs; 0.5 μA leakage avoids loading 12 V bias networks. |
| Portable Device Battery Monitoring | Medical Sensor Signal Conditioning |
Use Scenario: Scaling lithium-ion battery pack voltage (up to 42 V) into ADC input range of fuel gauge ICs. IC Role / Device Role / Timing Role: Precision voltage divider top resistor replaced by Zener-regulated reference node. Use Value: 30 V nominal Zener voltage provides known, temperature-stable scaling ratio independent of supply rail drift. | Use Scenario: Providing stable bias for op-amp-based instrumentation amplifiers in patient-worn biosensors. IC Role / Device Role / Timing Role: Low-noise voltage reference source for analog front-end gain-setting networks. Use Value: 12.5 Ω dynamic impedance minimizes AC error contribution in high-gain, low-frequency signal paths. |
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-C30LT1G | SO-23 package; 30 V nominal Zener; 350 mW Ptot at 25 °C; 30 Ω ZZT at 5 mA | Lower power rating and higher impedance limit use in higher-current regulation or tighter-tolerance designs | Select when board space permits larger footprint and thermal budget allows reduced derating |
| MMBZ5248BLT1G | SOT-23 package; 30 V nominal Zener; 225 mW Ptot at 25 °C; 35 Ω ZZT at 20 mA | Higher impedance and lower power capacity restrict use to low-current biasing, not main regulation rails | Prefer for cost-sensitive, low-power bias networks where 30 V reference suffices but regulation precision is secondary |
Compared with BZX84-C30LT1G and MMBZ5248BLT1G, the SMPZ3936B-E3/85A offers 2.2× higher power rating and <40 % Zener impedance at rated current-enabling robust regulation in industrial power supplies where thermal margin and load stability are critical.
Availability
SMPZ3936B-E3/85A is available at Aetrix Electronics and suitable for industrial power supply regulation, automotive ECU protection, and portable device battery monitoring requiring stable component supply and full MSL level 1 compliance.
Supply support for SMPZ3936B-E3/85A 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, efficiency, and application-specific optimization.
The SMPZ39XB series targets high-reliability surface-mount Zener regulation, engineered for compact, thermally efficient voltage reference and clamping in space-constrained industrial and automotive systems.
FAQ
What is the Zener voltage tolerance of SMPZ3936B-E3/85A?
The SMPZ3936B-E3/85A has a Zener voltage tolerance of ±5 % around its nominal 30 V rating, meaning the actual measured VZ falls between 28.5 V and 31.5 V at 26 mA test current and 25 °C ambient. This tolerance is guaranteed per the Vishay datasheet revision 25-Apr-2022 (document 88482) and applies to all units shipped under this part number.
Does SMPZ3936B-E3/85A support lead-free reflow soldering?
Yes, SMPZ3936B-E3/85A is qualified for lead-free reflow soldering with a maximum peak temperature of 260 °C for 10 seconds, meeting J-STD-020 MSL level 1 requirements. Its matte tin-plated terminals comply with J-STD-002 and JESD 22-B102, and the device requires no moisture preconditioning prior to assembly.
What is the maximum DC Zener current for SMPZ3936B-E3/85A?
The maximum DC Zener current (IZM) for SMPZ3936B-E3/85A is 50 mA, derived from its 500 mW power dissipation rating at 25 °C and nominal 30 V Zener voltage (P = V × I). This value assumes adequate PCB copper area (5.0 mm × 5.0 mm per pad) and ambient thermal management.
How does the thermal resistance of SMPZ3936B-E3/85A affect its power handling?
SMPZ3936B-E3/85A has a typical junction-to-ambient thermal resistance (RθJA) of 250 °C/W. At 25 °C ambient, its 500 mW rating drops to 1500 mW at 75 °C lead temperature-meaning effective power handling depends critically on PCB copper area and airflow. Derating follows the curve in Figure 1 of the Vishay datasheet.
Is SMPZ3936B-E3/85A halogen-free and RoHS-compliant?
Yes, SMPZ3936B-E3/85A carries the M3 suffix, indicating it is halogen-free, RoHS-compliant, and qualified as industrial grade per Vishay's material categorization standard (www.vishay.com/doc?99912). The molding compound meets UL 94 V-0 flammability rating, and terminals pass JESD 201 class 1A whisker testing.
SMPZ3936B-E3/85A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- eSMP®
- Package/Case:
- DO-220AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 500 mW
- Impedance (Max) (Zzt):
- 26 Ohms
- Current - Reverse Leakage @ Vr:
- 500 nA @ 22.8 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.5 V @ 200 mA
- Operating Temperature:
- -65°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-220AA (SMP)
SMPZ3936B-E3/85A FAQ
1.How can I place an order for SMPZ3936B-E3/85A through Aetrix?
Please submit a Request for Quotation (RFQ) for SMPZ3936B-E3/85A 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 SMPZ3936B-E3/85A reliable?
The price and inventory of SMPZ3936B-E3/85A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMPZ3936B-E3/85A is usually 5 days.
3.What payment methods are accepted for SMPZ3936B-E3/85A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMPZ3936B-E3/85A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMPZ3936B-E3/85A?
SMPZ3936B-E3/85A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMPZ3936B-E3/85A 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 SMPZ3936B-E3/85A?
For technical support, including SMPZ3936B-E3/85A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMPZ3936B-E3/85A requirements.
6.How does Aetrix verify that SMPZ3936B-E3/85A is sourced from the original manufacturer or authorized distributors?
All SMPZ3936B-E3/85A 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 SMPZ3936B-E3/85A meets industry standards.
7.What is the process for return or replacement of SMPZ3936B-E3/85A?
All SMPZ3936B-E3/85A units undergo pre-shipment inspection (PSI). If there is an issue with SMPZ3936B-E3/85A, 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 SMPZ3936B-E3/85A part is unused and in its original packaging.
Return procedure for SMPZ3936B-E3/85A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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