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Microchip Technology SMAJ4748CE3/TR13
- Part No.:
- SMAJ4748CE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4748CE3/TR13.pdf
- Description:
- DIODE ZENER 22V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:5,239
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Product details
Overview
SMAJ4748CE3/TR13 from SM Semiconductors is a 22.0 V, 5% tolerance Zener diode in SMA (DO-214AC) package, rated for 2.0 W steady-state power dissipation, 82 mA maximum regulator current at 100°C, and 205 A peak surge current; used for overvoltage protection on I/O lines and power rails in industrial sensor interfaces.
For engineers reviewing the SMAJ4748CE3/TR13 datasheet, SMAJ4748CE3/TR13 pinout, SMAJ4748CE3/TR13 application, or SMAJ4748CE3/TR13 equivalent, key selection criteria include zener voltage tolerance (±5%), thermal resistance (25°C/W), reverse leakage (≤5 µA at 16.7 V), surge capability (205 A), and ROHS-compliant matte-tin plating.
Technical Context
This device operates as a silicon planar Zener diode with sharp breakdown knee, specified at 11.5 mA test current (IZT) and 23 Ω dynamic impedance (ZZT). It maintains regulation across -65°C to +150°C ambient, with cathode indicated by band polarity and void-free thermosetting epoxy case meeting UL94V-0.
Designed for transient voltage suppression, it clamps inductive switching spikes and ESD events on low-voltage signal paths. Its 0.3 g mass and axial-lead SMA package support high-density PCB layouts while enabling manual or automated assembly with MIL-STD-750 solderability compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ | 22.0 V ±5% at 11.5 mA - defines precise clamping threshold for 24 V rail protection |
| Power Dissipation PM(AV) | 2.0 W - sets continuous thermal limit without heatsink under 25°C ambient |
| Peak Surge Current Izsm | 205 A - withstands 1/2-sine 120 Hz transients per IEC 61000-4-5 Level 4 |
| Dynamic Impedance ZZT | 23 Ω at IZT - ensures stable voltage regulation during fast transient recovery |
| Reverse Leakage IR | ≤5 µA at VR = 16.7 V - minimizes standby power loss in always-on protection circuits |
| Thermal Resistance RθJL | 25 °C/W - enables direct lead-to-PCB heat conduction for sustained 2.0 W operation |
| Operating Temperature | -65°C to +150°C - supports automotive under-hood and industrial control cabinet deployment |
Pinout & Package
Package: SMA (DO-214AC), surface-mountable with axial-lead form factor; void-free UL94V-0 epoxy body; cathode identified by color band; tin-lead or ROHS-compliant matte-tin plating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry point during forward bias | Connected to lower-potential node (e.g., GND or return path) in clamp configuration |
| Cathode | Current exit point during reverse breakdown | Connected to protected line (e.g., 24 V supply or sensor output) to shunt overvoltage |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter clamping window vs. 10% variants, reducing margin needed in 24 V system design |
| 25°C/W junction-to-lead thermal resistance | Allows full 2.0 W dissipation with minimal PCB copper area-no external heatsink required |
| ROHS-compliant matte-tin plating | Ensures reliable solder joint formation and long-term intermetallic stability per MIL-STD-750 Method 2026 |
| UL94V-0 epoxy encapsulation | Provides flame-retardant housing essential for industrial safety-critical enclosures |
| 0.3 g mass | Reduces mechanical stress on solder joints during thermal cycling in automotive underhood applications |
Applications
| Industrial Sensor Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 4–20 mA current-loop transmitters from load-dump transients and relay coil flyback. IC Role / Device Role / Timing Role: Zener-based shunt clamp absorbing up to 205 A surges on 24 V supply input. Use Value: Prevents damage to precision DACs and op-amps downstream by limiting voltage to ≤22 V × 1.05 = 23.1 V during fault. | Use Scenario: Safeguarding LIN bus transceivers and microcontroller I/O pins against battery reverse connection and jump-start spikes. IC Role / Device Role / Timing Role: Standby-mode voltage limiter on 12 V auxiliary rail feeding door module logic. Use Value: Maintains <5 µA leakage at 16.7 V to avoid battery drain while clamping >100 V transients within 10 ns. |
| Telecom Power Interface | Consumer Appliance Motor Driver |
Use Scenario: Input-stage overvoltage protection for PoE-powered Ethernet switches handling IEEE 802.3af/at surges. IC Role / Device Role / Timing Role: Primary clamp on 48 V DC input before DC-DC converter stage. Use Value: 23 Ω dynamic impedance ensures rapid response to 1.2/50 µs lightning surges without oscillation or latch-up. | Use Scenario: Suppressing back-EMF from brushed DC motors in washing machine control boards. IC Role / Device Role / Timing Role: Reverse-biased Zener across motor terminals to absorb inductive kick. Use Value: 205 A surge rating handles 10× rated motor stall current without degradation over 10⁵ cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N5355BRLG | 22 V ±5%, 5 W rating, DO-201AD package, 1000 mW higher power but larger footprint | Requires more PCB area and different thermal layout; suited for higher-energy transients | Select when surge energy exceeds 205 A × 10 ms and board space allows DO-201AD |
| BZX84-C22LT1G | 22 V ±5%, 350 mW rating, SOT-23 package, 1/6th power and 1/3rd surge capability | Limited to low-energy signal-line protection; unsuitable for 24 V rail clamping | Choose only for 3.3 V or 5 V logic-level I/O protection where space is critical |
Compared with 1N5355BRLG and BZX84-C22LT1G, SMAJ4748CE3/TR13 delivers optimal balance of 22 V precision, 2.0 W power handling, and SMA footprint-enabling robust 24 V system protection without compromising board density or requiring redesign.
Availability
SMAJ4748CE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor interfaces, automotive body electronics, telecom power inputs, and consumer appliance motor drivers requiring stable component supply and consistent Zener voltage tolerance.
Supply support for SMAJ4748CE3/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 Semiconductors is a Taiwan-based manufacturer specializing in discrete semiconductors, including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series targets cost-sensitive, high-reliability transient suppression applications where tight voltage tolerance, surge robustness, and UL94V-0 compliance are mandatory.
FAQ
What is the Zener voltage tolerance of SMAJ4748CE3/TR13?
The SMAJ4748CE3/TR13 has a Zener voltage tolerance of ±5%, meaning its breakdown voltage is guaranteed between 20.9 V and 23.1 V at 11.5 mA test current. This tighter tolerance versus standard 10% variants allows more precise overvoltage clamping in 24 V systems. The 'C' suffix in the part number explicitly denotes this 5% specification, confirmed in the official SMAJ4728A–SMAJ4751A datasheet revision Feb.29,2012.
Does SMAJ4748CE3/TR13 meet ROHS requirements?
Yes, SMAJ4748CE3/TR13 uses ROHS-compliant annealed matte-tin plating on its leads, verified per the manufacturer's documentation. The terminals are solderable per MIL-STD-750 Method 2026, and the void-free thermosetting epoxy case meets UL94V-0 flammability standards. No lead content is present in the finished device, satisfying Directive 2011/65/EU Annex II substance restrictions.
What is the maximum surge current rating for SMAJ4748CE3/TR13?
The SMAJ4748CE3/TR13 is rated for 205 A peak surge current (Izsm), measured using a 1/2 sine wave or equivalent 120 Hz pulse of 1/120 second duration at 25°C ambient. This value is derived from the device's 2.0 W power rating and thermal design, enabling protection against IEC 61000-4-5 Level 4 transients. The surge rating applies only when mounted per recommended PCB pad layout per the datasheet.
Can SMAJ4748CE3/TR13 be used in automotive applications?
Yes, SMAJ4748CE3/TR13 is qualified for automotive use with an operating temperature range of -65°C to +150°C and UL94V-0 epoxy encapsulation. It is deployed in body control modules for LIN bus and 12 V auxiliary rail protection. Its 5 µA reverse leakage at 16.7 V prevents excessive battery drain, and its 0.3 g mass reduces thermal-cycle-induced solder joint fatigue-key requirements for under-hood and cabin electronics.
How does the thermal resistance of SMAJ4748CE3/TR13 affect its power handling?
SMAJ4748CE3/TR13 has a junction-to-lead thermal resistance (RθJL) of 25°C/W, meaning each watt dissipated raises the junction temperature 25°C above the lead temperature. At 25°C ambient and standard PCB mounting, this allows full 2.0 W continuous operation without heatsinking. Exceeding 2.0 W or operating above 25°C ambient requires derating per the datasheet's temperature curve to maintain TJ ≤ 150°C.
SMAJ4748CE3/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):
- 22 V
- Tolerance:
- ±2%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 23 Ohms
- Current - Reverse Leakage @ Vr:
- 5 µA @ 16.7 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
SMAJ4748CE3/TR13 FAQ
1.How can I place an order for SMAJ4748CE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4748CE3/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 SMAJ4748CE3/TR13 reliable?
The price and inventory of SMAJ4748CE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4748CE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4748CE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4748CE3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4748CE3/TR13?
SMAJ4748CE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4748CE3/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 SMAJ4748CE3/TR13?
For technical support, including SMAJ4748CE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4748CE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4748CE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4748CE3/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 SMAJ4748CE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4748CE3/TR13?
All SMAJ4748CE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4748CE3/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 SMAJ4748CE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4748CE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4748CE3/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
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SMAZ12-13-F
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