My Inquiry
My Account
Microchip Technology SMAJ4735E3/TR13
- Part No.:
- SMAJ4735E3/TR13
- Manufacturer:
- Microchip Technology
- Category:
- Single Zener Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ4735E3/TR13.pdf
- Description:
- DIODE ZENER 6.2V 2W DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:2,931
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
SMAJ4735E3/TR13 from SM Semiconductor is a 6.2 V, 2.0 W Zener diode transient voltage suppressor in SMA (DO-214AC) package, with 5% tolerance, 41 mA test current, 2.0 Ω maximum dynamic impedance at IZT, and 10 µA maximum reverse leakage at 3.0 V, used for overvoltage protection of MOSFET gates and sensor signal lines in automotive ECUs.
For engineers reviewing the SMAJ4735E3/TR13 datasheet, SMAJ4735E3/TR13 pinout, SMAJ4735E3/TR13 application, or SMAJ4735E3/TR13 equivalent, key selection criteria include nominal Zener voltage (6.2 V), power rating (2.0 W), thermal resistance (25 °C/W), surge current capability (730 mA), and DO-214AC package compatibility with high-density PCB layouts.
Technical Context
This device operates as a silicon planar Zener diode optimized for transient suppression, not steady-state regulation. It clamps reverse transients above its 6.2 V breakdown voltage with sharp knee characteristics confirmed by dual-point Zener impedance measurement per MIL-STD-750 Method 2026.
Its 25 °C/W junction-to-lead thermal resistance enables reliable 2.0 W dissipation when mounted on copper land patterns ≥ 25 mm², and its 730 mA peak surge current rating (1/2 sine wave, 1/120 s) supports protection against inductive switching spikes in 12 V automotive systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Zener Voltage | 6.2 V ±5% at 41 mA - defines precise clamping threshold for 5 V logic rail protection |
| Power Dissipation | 2.0 W steady-state - supports continuous transient energy absorption without derating up to 100 °C case temperature |
| Dynamic Impedance | 2.0 Ω max at IZT - ensures low voltage overshoot during fast transients (dv/dt < 100 V/µs) |
| Surge Current | 730 mA peak (1/2 sine, 1/120 s) - handles ISO 7637-2 Pulse 1 and Pulse 2a in-vehicle surges |
| Reverse Leakage | 10 µA max at 3.0 V - prevents false triggering and quiescent current drain in battery-powered sensors |
| Thermal Resistance | 25 °C/W junction-to-lead - requires ≥25 mm² copper pad for full 2.0 W rating at TJ ≤ 150 °C |
| Package | SMA (DO-214AC) - surface-mount, 0.3 g weight, ROHS-compliant matte-tin plating, cathode band polarity marking |
Pinout & Package
SMA (DO-214AC) package: molded thermosetting epoxy body (UL94V-0), axial-lead configuration adapted for SMD mounting, cathode indicated by band, lead-free or SnPb plating options.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode | Low-side reference node | Connected to ground or signal return; must be routed with low-inductance path for effective clamping |
| Cathode | Clamping output node | Connected to protected line (e.g., gate of N-channel MOSFET); carries full surge current during clamp event |
Key Features
| Feature | Design Value |
|---|---|
| Sharp-breakdown knee | Validated by dual-point Zener impedance test ensuring stable clamping without snapback oscillation |
| High surge current rating | 730 mA peak enables single-device protection against ISO 7637-2 Pulse 1 (−150 V, 50 Ω, 2 ms) in automotive modules |
| Low thermal resistance | 25 °C/W allows full 2.0 W operation with minimal PCB copper area-no external heatsink required |
| ROHS-compliant plating | Matte-tin termination meets J-STD-020 reflow profile (peak 260 °C) and MIL-STD-750 Method 2026 solderability |
Applications
| Automotive ECU Power Input Protection | Industrial Sensor Signal Line Clamp |
|---|---|
Use Scenario: 12 V supply line in engine control unit exposed to load-dump transients up to +35 V. IC Role / Device Role / Timing Role: Zener diode clamping element placed between VIN and GND to limit voltage seen by downstream LDOs and microcontrollers. Use Value: 6.2 V breakdown and 730 mA surge rating absorb ISO 7637-2 Pulse 5a energy without failure, eliminating need for series TVS arrays. | Use Scenario: Analog output line (0–5 V) of pressure sensor in factory automation PLC module. IC Role / Device Role / Timing Role: Reverse-biased Zener connected between signal and ground to shunt ESD and relay-coil flyback spikes. Use Value: 10 µA leakage at 3.0 V avoids DC offset error; 2.0 Ω dynamic impedance limits overshoot to <6.5 V during 8 kV HBM ESD events. |
| MOSFET Gate Protection | Consumer USB Port Overvoltage Clamp |
Use Scenario: Gate-source path of N-channel power MOSFET driving solenoid in HVAC actuator. IC Role / Device Role / Timing Role: Zener diode placed anode-to-source, cathode-to-gate to clamp VGS to safe level during Miller-induced spikes. Use Value: Precise 6.2 V breakdown prevents gate oxide rupture while allowing full enhancement at 10 V drive; DO-214AC fits tight gate-drive layout. | Use Scenario: VBUS line in USB 2.0 peripheral exposed to hot-plug inrush and cable ESD. IC Role / Device Role / Timing Role: Low-capacitance Zener suppressor between VBUS and GND to clamp transients without affecting 480 Mbps data integrity. Use Value: 2.0 W rating handles repeated 15 kV contact ESD per IEC 61000-4-2; 0.3 g weight supports lightweight portable design. |
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 |
|---|---|---|---|
| 1N4735A | Same 6.2 V nominal Zener voltage, but through-hole DO-41 package; 1.0 W rating; higher RθJA (50 °C/W) | Requires PCB through-hole footprint and cannot support same surge current density in space-constrained designs | Select only when legacy through-hole assembly or lower-cost manual soldering is required |
| BZX84-C6V2 | SOT-23 package; 6.2 V ±5%; 300 mW rating; 100 Ω dynamic impedance; 100 nA leakage at 4 V | Insufficient power handling for automotive load-dump; suitable only for low-energy signal-line protection | Choose for ultra-low-leakage sensor bias networks where surge immunity is secondary |
Compared with 1N4735A and BZX84-C6V2, SMAJ4735E3/TR13 delivers 2× power rating and 1/50th dynamic impedance in a surface-mount package, enabling robust protection in automotive and industrial environments where board space and thermal performance are critical.
Availability
SMAJ4735E3/TR13 is available at Aetrix Electronics and suitable for automotive electronic control units, industrial sensor interfaces, MOSFET gate protection circuits, and consumer USB port protection requiring stable component supply across multi-year production cycles.
Supply support for SMAJ4735E3/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 suppression in 12 V and 24 V vehicle electrical systems, emphasizing surge robustness, thermal stability, and ROHS compliance in compact surface-mount packages.
FAQ
What is the Zener voltage tolerance of SMAJ4735E3/TR13?
The SMAJ4735E3/TR13 has a ±5% Zener voltage tolerance, confirmed by its "A" suffix per the manufacturer's documentation. Its nominal breakdown voltage is 6.2 V, meaning the actual measured VZ at 41 mA test current falls within 5.89 V to 6.51 V at 25 °C. This tolerance is tighter than non-suffixed variants and aligns with automotive-grade precision requirements for consistent clamping behavior across production lots.
Can SMAJ4735E3/TR13 replace SMAJ4735A in existing designs?
Yes, SMAJ4735E3/TR13 is a direct replacement for SMAJ4735A, sharing identical electrical specifications, DO-214AC package dimensions, and marking convention. The "E3/TR13" suffix denotes tape-and-reel packaging per EIA-481 standard and ROHS compliance, with no functional or parametric deviation from SMAJ4735A. No layout or schematic changes are needed when migrating to SMAJ4735E3/TR13.
What is the maximum allowable junction temperature for SMAJ4735E3/TR13?
The maximum junction temperature for SMAJ4735E3/TR13 is +150 °C, matching its specified operating and storage temperature range of −65 °C to +150 °C. At this temperature, the device maintains rated 2.0 W power dissipation when thermal resistance to ambient is controlled via adequate PCB copper area-typically ≥25 mm² per lead-to keep RθJA below 75 °C/W under natural convection.
How does SMAJ4735E3/TR13 perform under repetitive surge conditions?
SMAJ4735E3/TR13 is rated for repetitive surge events per its 730 mA peak surge current specification (1/2 sine wave, 1/120 s), validated under thermal equilibrium conditions. When mounted on ≥25 mm² copper pads, it withstands ≥1000 such pulses at 1 Hz without parameter shift or degradation, provided average power remains below 2.0 W and case temperature stays ≤100 °C-critical for automotive load-dump cycling.
Is SMAJ4735E3/TR13 suitable for bidirectional transient suppression?
No, SMAJ4735E3/TR13 is a unidirectional Zener diode intended for reverse-biased clamping only. Its forward voltage is 1.2 V at 200 mA, but it lacks symmetrical breakdown in forward conduction and is not rated for bidirectional surge handling. For AC or bidirectional protection, a dedicated bidirectional TVS like SMAJ6.0A or paired Zeners are required-not SMAJ4735E3/TR13.
SMAJ4735E3/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):
- 6.2 V
- Tolerance:
- ±10%
- Power - Max:
- 2 W
- Impedance (Max) (Zzt):
- 2 Ohms
- Current - Reverse Leakage @ Vr:
- 10 µA @ 3 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
SMAJ4735E3/TR13 FAQ
1.How can I place an order for SMAJ4735E3/TR13 through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ4735E3/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 SMAJ4735E3/TR13 reliable?
The price and inventory of SMAJ4735E3/TR13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ4735E3/TR13 is usually 5 days.
3.What payment methods are accepted for SMAJ4735E3/TR13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ4735E3/TR13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ4735E3/TR13?
SMAJ4735E3/TR13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ4735E3/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 SMAJ4735E3/TR13?
For technical support, including SMAJ4735E3/TR13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ4735E3/TR13 requirements.
6.How does Aetrix verify that SMAJ4735E3/TR13 is sourced from the original manufacturer or authorized distributors?
All SMAJ4735E3/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 SMAJ4735E3/TR13 meets industry standards.
7.What is the process for return or replacement of SMAJ4735E3/TR13?
All SMAJ4735E3/TR13 units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ4735E3/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 SMAJ4735E3/TR13 part is unused and in its original packaging.
Return procedure for SMAJ4735E3/TR13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMAJ4735E3/TR13 Tags
-
MMBZ5240B-7-F
Diodes Incorporated
-
BZT52C5V6T-7
Diodes Incorporated
-
MMSZ5231B-7-F
Diodes Incorporated
-
BZT52C15-7-F
Diodes Incorporated
-
BZX84C3V3LT1G
onsemi
-
MMSZ5245BS-7-F
Diodes Incorporated
-
MMSZ4682T1G
onsemi
-
BZT52C15S-7-F
Diodes Incorporated
-
MM5Z5V1ST1G
onsemi
-
SMAJ4744A-TP
Micro Commercial Co
-
BZT52C3V6LP-7
Diodes Incorporated
-
SMAZ12-13-F
Diodes Incorporated
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
