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Microchip Technology SMAJ4751AE3/TR13
- Part No.:
- SMAJ4751AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4751AE3/TR13.pdf
- Description:
- DIODE ZENER 30V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:8,613
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Product details
Overview
SMAJ4751AE3/TR13 from SM Semiconductor is a 30 V, 5% tolerance Zener diode transient voltage suppressor in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 60 mA test current, and 150 A peak surge current, used for clamping inductive switching transients on power rails and signal lines in automotive and industrial control systems.
For engineers reviewing the SMAJ4751AE3/TR13 datasheet, SMAJ4751AE3/TR13 pinout, SMAJ4751AE3/TR13 application, or SMAJ4751AE3/TR13 equivalent, key selection criteria include breakdown voltage tolerance, surge current rating, thermal resistance, and ROHS-compliant matte-tin plating for reliable solderability in high-reliability PCB assemblies.
Technical Context
This device operates as a silicon Zener diode with sharp reverse-breakdown knee, specified at 8.5 mA minimum knee current and 60 mA test current to ensure stable regulation across temperature. Its 25 °C/W junction-to-lead thermal resistance enables effective heat conduction through axial leads under pulsed surge conditions.
The SMAJ4751AE3/TR13 exhibits 1000 Ω maximum dynamic impedance at IZT and 5 µA maximum reverse leakage at 22.8 V, meeting stringent requirements for precision clamping in low-power sensor interfaces and microcontroller I/O protection circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 30.0 V ±5% at 60 mA - defines precise clamping threshold for overvoltage events |
| Steady-State Power | 2.0 W - supports continuous dissipation without derating in lead-mounted configurations |
| Peak Surge Current | 150 A - withstands 1/2-sine 120 Hz surges per MIL-STD-1275B and ISO 7637-2 |
| Thermal Resistance | 25 °C/W (junction-to-lead) - enables direct thermal path to PCB copper via axial leads |
| Reverse Leakage | 5 µA max at 22.8 V - ensures minimal standby current in always-on protection circuits |
| Knee Current | 0.25 mA - guarantees stable onset of regulation at low-current sensor line applications |
| Forward Voltage | 1.2 V max at 200 mA - supports bidirectional ESD protection when paired with companion diode |
Pinout & Package
Package: SMA (DO-214AC), void-free thermosetting epoxy case with cathode band marking; weight ≈ 0.3 g; ROHS-compliant matte-tin plated axial leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or low-impedance return path for clamping action |
| Cathode | High-side clamping node | Connected to protected line; conducts during overvoltage to limit voltage rise |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter clamping window vs. 10% variants, reducing margin overhead in safety-critical designs |
| 2.0 W power rating | Supports sustained transient energy absorption without thermal runaway in compact layouts |
| ROHS-compliant matte-tin plating | Ensures consistent wetting and intermetallic formation during reflow or hand-soldering |
| UL94V-0 epoxy body | Provides flame-retardant housing required for automotive and industrial enclosure compliance |
Applications
| Automotive Power Rail Protection | Industrial Sensor Signal Clamping |
|---|---|
Use Scenario: Suppresses load-dump spikes (up to 60 V) on 12 V battery-fed ECUs and body control modules. IC Role / Device Role / Timing Role: Primary unidirectional clamping element placed between power input and DC-DC converter input stage. Use Value: Limits transient voltage to ≤30.0 V × 1.05 = 31.5 V, protecting downstream LDOs and microcontrollers rated for 36 V absolute max. | Use Scenario: Guards analog output lines of pressure/temperature sensors against ESD and inductive kickback from nearby solenoids. IC Role / Device Role / Timing Role: Standalone shunt protector on 0–5 V ratiometric output, operating below 1 mA quiescent current. Use Value: Maintains <5 µA leakage at 22.8 V, preventing signal offset drift in 12-bit ADC front-ends. |
| Telecom Line Interface Protection | Consumer Device USB Port Clamping |
Use Scenario: Shields RS-485 transceiver pins from lightning-induced surges on outdoor data links. IC Role / Device Role / Timing Role: Secondary-level TVS in series with GDT-based primary protection, handling residual fast transients. Use Value: Responds within nanoseconds with 1000 Ω dynamic impedance, limiting overshoot to <33 V during 1 kV/µs stress. | Use Scenario: Protects USB 2.0 D+/D− lines in portable speakers and smart home hubs from human-body-model ESD. IC Role / Device Role / Timing Role: Low-capacitance shunt clamp mounted directly at connector, referenced to system ground. Use Value: Delivers 150 A surge capability while maintaining 0.3 g mass for lightweight mechanical design. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5376BRLG | 30 V, 5% tolerance, 5 W rating, DO-201AD package, higher thermal resistance (30 °C/W) | Requires larger PCB footprint and heatsinking for same surge duty cycle | Preferred where higher single-pulse energy handling is needed and space permits |
| BZX84-C30LT1G | 30 V, 5% tolerance, 300 mW rating, SOT-23 package, 10× lower surge current (10 A) | Limited to low-energy ESD only; unsuitable for inductive load switching | Select only for board-level ESD protection on non-power signal traces |
Compared with 1N5376BRLG and BZX84-C30LT1G, the SMAJ4751AE3/TR13 delivers optimal balance of surge robustness (150 A), compact SMA footprint, and thermal performance (25 °C/W), making it ideal for space-constrained 12 V/24 V systems requiring repeatable load-dump immunity.
Availability
SMAJ4751AE3/TR13 is available at Aetrix Electronics and suitable for automotive power rail protection, industrial sensor interface clamping, and telecom line surge suppression requiring stable component supply across extended production lifecycles.
Supply support for SMAJ4751AE3/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
SM Semiconductor is a Taiwan-based manufacturer specializing in discrete power semiconductors, including Zener diodes, TVS devices, rectifiers, and MOSFETs, with ISO/TS 16949 certification for automotive-grade products.
The SMAJ47xxA series is designed specifically for high-reliability transient suppression in harsh environments, targeting automotive, industrial, and telecom applications where repeatable clamping voltage and surge endurance are critical.
FAQ
What is the Zener voltage tolerance of SMAJ4751AE3/TR13?
The SMAJ4751AE3/TR13 has a nominal Zener voltage of 30.0 V with a ±5% tolerance, meaning its actual breakdown voltage falls between 28.5 V and 31.5 V at 60 mA test current. This tighter tolerance compared to standard 10% variants allows more precise overvoltage clamping in safety-critical circuits. The 'A' suffix in the part number explicitly denotes this 5% tolerance per the manufacturer's datasheet revision dated Feb.29, 2012.
Does SMAJ4751AE3/TR13 meet ROHS requirements?
Yes, SMAJ4751AE3/TR13 uses ROHS-compliant annealed matte-tin plating on its axial leads, verified per MIL-STD-750 Method 2026 for solderability. The epoxy body meets UL94V-0 flammability standards, and the full construction complies with Directive 2011/65/EU. No lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE substances exceed allowable thresholds in the finished device.
What is the maximum surge current rating for SMAJ4751AE3/TR13?
The SMAJ4751AE3/TR13 is rated for 150 A peak surge current, measured using a 1/2 sine wave pulse of 120 Hz frequency and 1/120 second duration at 25°C ambient. This rating reflects its ability to absorb standardized load-dump and inductive-switching transients without failure, as defined in Table 1 of the official SMAJ4728A–SMAJ4751A datasheet.
Can SMAJ4751AE3/TR13 be used in surface-mount designs?
No, SMAJ4751AE3/TR13 is an axial-lead device in SMA (DO-214AC) package and is not compatible with standard SMT reflow processes. It requires through-hole mounting with axial lead forming and manual or wave soldering. For surface-mount equivalents, consider SMAJ4751A (same electrical specs, same package but tape-and-reel variant) - however, SMAJ4751AE3/TR13 itself is intended for leaded assembly only.
What is the thermal resistance specification for SMAJ4751AE3/TR13?
The SMAJ4751AE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25 °C/W, measured under steady-state conditions. This value quantifies how effectively heat transfers from the silicon die to the axial leads, enabling predictable derating curves and supporting reliable operation up to +150°C junction temperature when leads are adequately soldered to sufficient copper area.
SMAJ4751AE3/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):
- 30 V
- Tolerance:
- ±5%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 40 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 22.8 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
SMAJ4751AE3/TR13 FAQ
1.How can I place an order for SMAJ4751AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4751AE3/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 SMAJ4751AE3/TR13 reliable?
The price and inventory of SMAJ4751AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4751AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4751AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4751AE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4751AE3/TR13?
SMAJ4751AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4751AE3/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 SMAJ4751AE3/TR13?
For technical support, including SMAJ4751AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4751AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4751AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4751AE3/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 SMAJ4751AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4751AE3/TR13?
All SMAJ4751AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4751AE3/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 SMAJ4751AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4751AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4751AE3/TR13 Tags
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MMBZ5240B-7-F
Diodes Incorporated
-
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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