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Microchip Technology SMAJ4748AE3/TR13
- Part No.:
- SMAJ4748AE3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4748AE3/TR13.pdf
- Description:
- DIODE ZENER 22V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:7,675
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Product details
Overview
SMAJ4748AE3/TR13 from SM Semiconductor 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 mA peak surge current; used for transient voltage suppression in I/O protection circuits of industrial sensor interfaces.
For engineers reviewing the SMAJ4748AE3/TR13 datasheet, SMAJ4748AE3/TR13 pinout, SMAJ4748AE3/TR13 application, or SMAJ4748AE3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (25°C/W), reverse leakage at 16.7 V, knee impedance, and surge current capability under 1/2-sine 1/120 s pulse conditions.
Technical Context
This device operates as a silicon-based voltage-regulating transient voltage suppressor with sharp breakdown knee characteristics verified by dual-point Zener impedance measurement at 10% AC superimposed on DC test current. It maintains stable regulation across -65°C to +150°C operating temperature range.
Designed for unidirectional clamping, SMAJ4748AE3/TR13 features cathode band polarity marking, void-free UL94V-0 epoxy case, and matte-tin plating compliant with MIL-STD-750 Method 2026. Its 25°C/W junction-to-lead thermal resistance enables reliable power handling when mounted on PCBs with adequate copper thermal relief.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage VZ @ IZT | 22.0 V ±5% at 11.5 mA - defines precise clamping threshold for overvoltage protection |
| Maximum Regulator Current IZM | 82 mA at TJ = 100°C - sets continuous DC current limit before thermal derating |
| Peak Surge Current Izsm | 205 mA (1/2-sine, 1/120 s) - determines single-pulse transient energy absorption capacity |
| Dynamic Impedance ZZT @ IZT | 23.0 Ω - indicates low incremental resistance near operating point for tight voltage regulation |
| Reverse Leakage IR @ VR | 5 µA max at 16.7 V - ensures minimal standby power loss in high-impedance signal lines |
| Thermal Resistance RθJL | 25 °C/W - quantifies junction-to-lead heat transfer efficiency for PCB thermal design |
| Operating Temperature | -65°C to +150°C - supports deployment in automotive under-hood and industrial control environments |
Pinout & Package
Package: SMA (DO-214AC), surface-mount, cathode indicated by band, 0.3 g typical weight, void-free UL94V-0 epoxy body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Forward conduction terminal | Connected to lower-potential node during normal operation; conducts when forward-biased ≥1.2 V |
| Cathode | Reverse breakdown terminal | Connected to protected line; clamps transients above 22.0 V by entering avalanche conduction |
Key Features
| Feature | Design Value |
|---|---|
| 5% Zener voltage tolerance | Enables tighter clamping window vs. 10% variants, reducing margin needed in sensitive analog front-ends |
| 2.0 W steady-state power rating | Supports sustained clamping in moderate-duty industrial I/O protection without external heatsinking |
| Knee impedance ≤720 Ω @ IZK | Ensures stable turn-on behavior at low currents (0.25 mA), critical for low-power sensor wake-up circuits |
| UL94V-0 epoxy encapsulation | Meets flammability safety requirements for enclosed industrial and automotive electronics enclosures |
| ROHS-compliant matte-tin plating | Guarantees solderability and intermetallic reliability per MIL-STD-750 Method 2026 |
Applications
| Industrial Sensor Protection | Automotive Body Control Module I/O |
|---|---|
Use Scenario: Protecting 24 V CAN/LIN bus interface pins against load-dump and inductive switching transients in factory automation PLCs. IC Role / Device Role / Timing Role: Unidirectional transient voltage suppressor placed between signal line and ground. Use Value: Clamps spikes up to 205 mA surge while maintaining 22.0 V threshold, preventing damage to downstream RS-485 transceivers. | Use Scenario: Safeguarding microcontroller GPIOs connected to door lock actuators and window lift motors. IC Role / Device Role / Timing Role: Zener clamp on switched 12 V supply rail feeding MCU input conditioning circuitry. Use Value: Limits transient overshoot to ≤22.0 V with 5 µA leakage at 16.7 V, preserving low-power sleep mode integrity. |
| Telecom Power Supply Rail Clamp | Consumer Appliance Motor Driver Feedback Protection |
Use Scenario: Secondary-side overvoltage suppression on 24 V telecom power distribution board feeding PoE injectors. IC Role / Device Role / Timing Role: Standby-mode Zener regulator absorbing repetitive 100 ns–1 µs transients from relay contact bounce. Use Value: Maintains 22.0 V clamping with 23.0 Ω dynamic impedance, minimizing voltage excursion during fast-rising surges. | Use Scenario: Protecting hall-effect sensor feedback lines in BLDC motor controllers inside washing machines. IC Role / Device Role / Timing Role: Low-leakage (5 µA) clamp on 5 V analog sensor supply rail subjected to ESD and brush-commutator noise. Use Value: Prevents latch-up in ADC inputs by limiting rail excursion to 22.0 V while adding negligible offset error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode transient suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | Same 22 V nominal voltage but DO-41 axial package; higher RθJA (65°C/W); no ROHS compliance stated | Requires through-hole mounting; less suitable for automated SMT assembly and high-density layouts | Prefer SMAJ4748AE3/TR13 for surface-mount production and thermal performance-critical designs |
| BZX84-C22 | 22 V ±5%, SOT-23 package; lower power rating (300 mW); 150 Ω typical ZZT; 100 nA IR @ 17.6 V | Optimized for low-current signal-line protection; insufficient for 205 mA surge duty | Select SMAJ4748AE3/TR13 where surge immunity >150 mA and power dissipation >0.5 W is required |
Compared with 1N4748A and BZX84-C22, SMAJ4748AE3/TR13 delivers superior surge robustness (205 mA), lower thermal resistance (25°C/W), and SMT compatibility-making it optimal for industrial-grade 24 V system protection where reliability and manufacturability are jointly prioritized.
Availability
SMAJ4748AE3/TR13 is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body control module I/O, and telecom power rail clamping requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for SMAJ4748AE3/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 semiconductor components including Zener diodes, TVS devices, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for high-reliability transient voltage suppression in space-constrained, thermally demanding applications-emphasizing tight voltage tolerance, repeatable surge performance, and UL-certified packaging.
FAQ
What is the Zener voltage tolerance of SMAJ4748AE3/TR13?
SMAJ4748AE3/TR13 has a ±5% Zener voltage tolerance, meaning its breakdown voltage at 11.5 mA test current falls within 20.9 V to 23.1 V at 25°C. This tighter tolerance versus standard 10% variants allows more precise clamping in voltage-sensitive protection circuits. The 'A' suffix in the part number explicitly denotes this 5% specification per the manufacturer's documentation.
Does SMAJ4748AE3/TR13 meet ROHS requirements?
Yes, SMAJ4748AE3/TR13 uses ROHS-compliant annealed matte-tin plating on its terminals, verified per MIL-STD-750 Method 2026 for solderability. The void-free UL94V-0 epoxy case and lead-free construction align with Directive 2011/65/EU. Full compliance documentation is available upon request for Aetrix Electronics customers.
What is the maximum surge current rating for SMAJ4748AE3/TR13?
SMAJ4748AE3/TR13 is rated for 205 mA peak surge current under standardized 1/2-sine wave conditions with 1/120 second duration. This value reflects its ability to absorb transient energy without failure and is measured at 25°C ambient. Derating applies at elevated temperatures per the device's thermal resistance profile.
How does the thermal resistance of SMAJ4748AE3/TR13 affect PCB layout?
SMAJ4748AE3/TR13 has a junction-to-lead thermal resistance of 25°C/W. To maintain safe operating temperature, PCB layout must provide sufficient copper area connected to both leads-especially the cathode-to dissipate 2.0 W steady-state power. Thermal vias and inner-layer copper pours are recommended when ambient exceeds 70°C.
Can SMAJ4748AE3/TR13 be used in bidirectional transient suppression?
No, SMAJ4748AE3/TR13 is a unidirectional Zener diode intended for single-polarity clamping. It conducts only when cathode voltage exceeds anode by ≥22.0 V. For bidirectional protection (e.g., AC signal lines), a pair of SMAJ4748AE3/TR13 devices in series opposition-or a dedicated bidirectional TVS like SMAJ22A-is required.
SMAJ4748AE3/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:
- ±5%
- 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
SMAJ4748AE3/TR13 FAQ
1.How can I place an order for SMAJ4748AE3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4748AE3/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 SMAJ4748AE3/TR13 reliable?
The price and inventory of SMAJ4748AE3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4748AE3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4748AE3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4748AE3/TR13 transactions.
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4.How is shipping managed for SMAJ4748AE3/TR13?
SMAJ4748AE3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4748AE3/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 SMAJ4748AE3/TR13?
For technical support, including SMAJ4748AE3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4748AE3/TR13 requirements.
6.How does Aetrix verify that SMAJ4748AE3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4748AE3/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 SMAJ4748AE3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4748AE3/TR13?
All SMAJ4748AE3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4748AE3/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 SMAJ4748AE3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4748AE3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4748AE3/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
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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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