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Microchip Technology SMAJ4764E3/TR13
- Part No.:
- SMAJ4764E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4764E3/TR13.pdf
- Description:
- DIODE ZENER 100V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,582
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Product details
Overview
SMAJ4764E3/TR13 from Microsemi (now Microchip Technology) is a 100 V, 2 W surface-mount Zener diode in DO-214AC (SMA) package, rated for 45 A peak surge current and 18 mA maximum regulator current at 100°C, used for overvoltage protection and voltage regulation in power supply rails and I/O interface circuits.
For engineers reviewing the SMAJ4764E3/TR13 datasheet, SMAJ4764E3/TR13 pinout, SMAJ4764E3/TR13 application, or SMAJ4764E3/TR13 equivalent, key selection criteria include zener voltage tolerance (5%), dynamic impedance (350 Ω @ 2.5 mA), reverse leakage (5 µA @ 76 V), thermal resistance (25°C/W), and JEDEC DO-214AC mechanical compatibility.
Technical Context
This Zener diode operates in reverse breakdown to maintain stable reference voltage under varying load and line conditions. It features a sharp knee impedance characteristic (ZZK = 0.25 Ω @ 0.25 mA) and is rated for continuous power dissipation of 2.0 W when mounted on 4.0 mm² copper pads per terminal.
Designed for transient suppression and precision voltage clamping, it supports steady-state regulation up to 18 mA at elevated junction temperature (100°C), with derating to zero power at 150°C. Polarity is marked by a cathode band, and soldering must not exceed 260°C for 10 seconds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage (VZ) | 100 V ±5% at 2.5 mA test current - defines clamping threshold for overvoltage events |
| Power Dissipation (PAV) | 2.0 W - requires 4.0 mm² copper pad per terminal for thermal management |
| Peak Surge Current (IS) | 45 A - withstands ½-sine wave transients per MIL-STD-750 Method 3012 |
| Dynamic Impedance (ZZT) | 350 Ω @ 2.5 mA - indicates voltage regulation stability under small-signal variation |
| Reverse Leakage (IR) | 5 µA @ 76 V - ensures low standby power loss in high-impedance bias networks |
| Junction Temperature Range | –55°C to +150°C - supports operation in automotive under-hood and industrial control environments |
| Thermal Resistance (RθJL) | 25°C/W - enables thermal modeling of PCB trace and pad heat sinking |
Pinout & Package
DO-214AC (SMA) surface-mount package with cathode band marking polarity; two-terminal device with anode and cathode leads formed as flat gull-wing terminations for reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point in forward bias; connected to lower-potential node in Zener regulation | Must be routed to ground or common return path for proper clamping function |
| Cathode | Current exit point in reverse breakdown; voltage reference node | Connected to protected rail or signal line; cathode band identifies this terminal visually and in layout |
Key Features
| Feature | Design Value |
|---|---|
| JEDEC DO-214AC mechanical compliance | Enables drop-in replacement for legacy 1N4764A in existing SMA footprints without layout change |
| 2 W steady-state power rating | Supports sustained clamping in 12–48 V DC power systems with adequate PCB copper area |
| 45 A peak surge capability | Meets IEC 61000-4-5 Level 4 (4 kV) surge immunity requirements when properly decoupled |
| 5% zener voltage tolerance | Provides predictable clamping margin for safety-critical overvoltage cutoff circuits |
| Cathode band polarity marking | Eliminates assembly errors during automated placement and visual inspection |
Applications
| Industrial Power Supply Protection | Automotive ECU Input Clamping |
|---|---|
Use Scenario: Protecting 24 V DC input stage of programmable logic controllers against load dump transients. IC Role / Device Role / Timing Role: Zener clamping element placed across input rail and chassis ground. Use Value: Limits transient voltage to ≤105 V, preventing damage to downstream DC/DC converters and microcontrollers. | Use Scenario: Safeguarding CAN transceiver VCC pins against battery voltage spikes during alternator load dump. IC Role / Device Role / Timing Role: Standby shunt regulator that conducts only during overvoltage events. Use Value: Maintains regulated 100 V clamp level with <5 µA leakage at nominal 13.5 V, minimizing quiescent current impact. |
| Telecom Line Interface Protection | Test Equipment Reference Stabilization |
Use Scenario: Secondary overvoltage protection on -48 V telecom power feed lines exposed to lightning-induced surges. IC Role / Device Role / Timing Role: Fast-response voltage clamp in parallel with primary TVS array. Use Value: Adds precise 100 V threshold with 350 Ω dynamic impedance to improve clamping accuracy versus generic TVS diodes. | Use Scenario: Providing stable 100 V reference for calibration circuits in portable multimeters and source-measure units. IC Role / Device Role / Timing Role: Precision Zener reference operating at 2.5 mA with minimal self-heating. Use Value: Delivers ±5% voltage accuracy and <0.25 Ω knee impedance for repeatable bench-level voltage standardization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener regulation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4764A | Through-hole DO-41 package; identical electrical specs but different mounting method and thermal profile | Requires PCB through-hole footprint and wave solder process; unsuitable for fully SMT designs | Select when legacy board reuse or manual prototyping is required |
| MMSZ5264ET1G | 0.5 W SOD-123 package; 100 V ±5%, but lower surge rating (20 A) and higher ZZT (700 Ω) | Limited to low-energy clamping in space-constrained consumer electronics, not industrial transients | Select only for cost-sensitive, low-power applications where 2 W rating is unnecessary |
Compared with 1N4764A and MMSZ5264ET1G, SMAJ4764E3/TR13 uniquely combines 2 W power handling, 45 A surge capability, and DO-214AC surface-mount compatibility-making it the only option for high-reliability SMT designs requiring robust 100 V clamping.
Availability
SMAJ4764E3/TR13 is available at Aetrix Electronics and suitable for industrial power supply protection, automotive ECU input clamping, and telecom line interface protection requiring stable component supply and full traceability.
Supply support for SMAJ4764E3/TR13 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
Microsemi (acquired by Microchip Technology in 2018) is a U.S.-based semiconductor company specializing in high-reliability analog, mixed-signal, and radiation-hardened components.
The SMAJ47xx series was designed for ruggedized surface-mount voltage regulation and transient suppression in aerospace, defense, and industrial systems where long-term stability and surge resilience are critical.
FAQ
What is the zener voltage tolerance for SMAJ4764E3/TR13?
The SMAJ4764E3/TR13 has a nominal zener voltage of 100 V with a tolerance of ±5%, as confirmed in the Electrical Characteristics table. This tolerance applies under standard test conditions (25°C, 2.5 mA test current), and no suffix (e.g., 'C' or 'D') is present in the part number, indicating the default 5% grade. The SMAJ4764E3/TR13 maintains this specification across its qualified operating temperature range.
Is SMAJ4764E3/TR13 compatible with the legacy 1N4764A in terms of electrical performance?
Yes, SMAJ4764E3/TR13 is electrically equivalent to 1N4764A per the manufacturer's documentation, sharing identical zener voltage (100 V), test current (2.5 mA), dynamic impedance (350 Ω), and reverse leakage (5 µA @ 76 V). However, SMAJ4764E3/TR13 uses a DO-214AC package while 1N4764A uses DO-41-so mechanical fit and thermal behavior differ despite matching electrical behavior.
What is the maximum allowable surge current for SMAJ4764E3/TR13?
The SMAJ4764E3/TR13 is rated for a peak surge current (IS) of 45 A, measured using a ½-sine wave pulse of 1/120 second duration at 25°C ambient. This value is specified in the Electrical Characteristics table and reflects capability under standardized transient stress conditions defined in MIL-STD-750 Method 3012.
Does SMAJ4764E3/TR13 require heatsinking for 2 W operation?
The SMAJ4764E3/TR13 achieves its 2.0 W steady-state power rating only when mounted on 4.0 mm² copper pads per terminal, as stated in Note 2 of the Maximum Ratings table. Without this minimum copper area, thermal resistance rises above the rated 25°C/W, causing junction temperature to exceed safe limits. No external heatsink is needed if PCB layout meets this copper requirement.
How is polarity identified on SMAJ4764E3/TR13?
Polarity on SMAJ4764E3/TR13 is indicated by a visible cathode band located near one end of the DO-214AC package body. Per Mechanical Data, this band marks the cathode terminal, which must be connected to the higher-potential node (e.g., protected rail) during Zener operation. The anode is the unmarked terminal and connects to ground or return.
SMAJ4764E3/TR13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- DO-214AC, SMA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Voltage - Zener (Nom) (Vz):
- 100 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 350 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 76 V
- Voltage - Forward (Vf) (Max) @ If:
- 1.2 V @ 200 mA
- Operating Temperature:
- -55°C ~ 150°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC
SMAJ4764E3/TR13 FAQ
1.How can I place an order for SMAJ4764E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4764E3/TR13 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 SMAJ4764E3/TR13 reliable?
The price and inventory of SMAJ4764E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4764E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4764E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4764E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4764E3/TR13?
SMAJ4764E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4764E3/TR13 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 SMAJ4764E3/TR13?
For technical support, including SMAJ4764E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4764E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4764E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4764E3/TR13 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 SMAJ4764E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4764E3/TR13?
All SMAJ4764E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4764E3/TR13, 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 SMAJ4764E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4764E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4764E3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
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BZT52C5V6T-7
Diodes Incorporated
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MMSZ5231B-7-F
Diodes Incorporated
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BZT52C15-7-F
Diodes Incorporated
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BZX84C3V3LT1G
onsemi
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MMSZ5245BS-7-F
Diodes Incorporated
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MMSZ4682T1G
onsemi
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BZT52C15S-7-F
Diodes Incorporated
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MM5Z5V1ST1G
onsemi
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SMAJ4744A-TP
Micro Commercial Co
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BZT52C3V6LP-7
Diodes Incorporated
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SMAZ12-13-F
Diodes Incorporated
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