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Taiwan Semiconductor Corporation SMAJ16CH
- Part No.:
- SMAJ16CH
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AC, SMA
- Datasheet:
-
SMAJ16CH.pdf
- Description:
- TVS DIODE 16VWM 28.8VC DO214AC
- Quantity:
- Payment:
- Shipping:
Inventory:4,713
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Product details
Overview
SMAJ16CH from Taiwan Semiconductor is a unidirectional surface-mount transient voltage suppressor (TVS) diode in DO-214AC (SMA) package, designed for automotive-grade overvoltage protection. It features a 16 V working stand-off voltage (VWM), 17.8–21.8 V breakdown voltage (VBR), 28.8 V maximum clamping voltage (VC) at 13.9 A peak pulse current, and 400 W peak pulse power rating per 10/1000 µs waveform - deployed in on-board DC/DC converters and SMPS input stages.
For engineers reviewing the SMAJ16CH datasheet, SMAJ16CH pinout, SMAJ16CH application, or SMAJ16CH equivalent, key selection criteria include clamping performance under ISO 7637-2 Pulse 1/2a/2b/3a/3b transients, AEC-Q101 qualification status, moisture sensitivity level (MSL 1), and compatibility with automated SMT placement in high-reliability automotive and industrial power systems.
Technical Context
The SMAJ16CH operates as a unidirectional avalanche diode with glass-passivated junction, delivering sub-1 ps response time from 0 V to VBR(min). Its clamping behavior is defined by a 10/1000 µs double-exponential surge waveform, with peak impulse current rated at 13.9 A and steady-state power dissipation limited to 1 W.
Designed for bidirectional-capable families but configured unidirectionally (no "CH" suffix implies cathode-band polarity marking), it supports operating junction temperatures from –55 °C to +150 °C and meets JESD201 Class 2 whisker resistance and UL 94V-0 flammability requirements for epoxy molding compound.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 16 V - Maximum continuous reverse voltage before leakage exceeds 1 µA; sets system-level overvoltage trip threshold |
| VBR @ IT=1 mA | 17.8–21.8 V - Breakdown onset range defining reliable avalanche conduction start under transient stress |
| VC @ IPPM=13.9 A | 28.8 V - Clamped voltage during 10/1000 µs surge; limits downstream IC stress to safe margin below 30 V rails |
| PPPM | 400 W - Peak pulse power handling per standard waveform; enables robust protection against load-dump and inductive switching events |
| IR @ VWM | <1 µA - Ultra-low reverse leakage ensures minimal standby power loss in always-on circuits |
| TJ(max) | +150 °C - Enables operation in under-hood automotive environments without thermal derating penalties |
| Package | DO-214AC (SMA) - Industry-standard surface-mount outline with 0.060 g mass and matte tin-plated leads compliant with J-STD-002 solderability |
Pinout & Package
DO-214AC (SMA) package: molded plastic case with cathode band marking; anode and cathode terminals exposed on opposite ends of the rectangular body; lead-free, RoHS- and halogen-free compliant; MSL Level 1 per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (unmarked end) | Current entry point during forward conduction | Connected to protected line (e.g., +12 V rail); forms low-impedance path to ground during overvoltage |
| Cathode (banded end) | Current exit point during reverse-biased clamping | Connected to system ground; defines polarity-sensitive clamping direction for unidirectional operation |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q101 qualified | Validated for automotive electronics per stress test conditions including temperature cycling, HTRB, and ESD; supports PPAP documentation |
| Glass-passivated junction | Enhances long-term reliability and stability of VBR and leakage under thermal/humidity aging |
| Fast response time <1 ps | Clamps transients before sensitive downstream logic or analog circuitry experiences damaging voltage overshoot |
| ISO 7637-2 compliance | Withstands standardized automotive electrical disturbance pulses (Pulse 1, 2a, 2b, 3a, 3b) without degradation |
| Matte tin-plated leads | Ensures consistent solder wetting and intermetallic formation in reflow processes; compatible with Pb-free assembly |
Applications
| Automotive On-Board DC/DC Converters | Industrial Switching Mode Power Supplies |
|---|---|
Use Scenario: Protecting 12 V/24 V input stage of buck converter modules in ADAS ECUs subjected to load dump and jump-start surges. IC Role / Device Role / Timing Role: Unidirectional TVS clamp placed between input rail and chassis ground to shunt transient energy before it reaches controller IC and MOSFET gate drivers. Use Value: Limits clamped voltage to 28.8 V, maintaining safe margin below 30 V absolute maximum rating of typical PWM controllers and gate drivers. | Use Scenario: Input-stage surge suppression in DIN-rail mounted 48 V telecom rectifiers exposed to lightning-induced surges on AC mains lines. IC Role / Device Role / Timing Role: Primary transient absorber located after bridge rectifier and before bulk capacitor, absorbing 10/1000 µs line-to-ground spikes. Use Value: Delivers 400 W peak pulse power handling with <1 µA leakage at 16 V, minimizing standby losses while ensuring immunity to IEC 61000-4-5 Level 3 threats. |
| LED Driver Power Inputs | Automotive Lighting Modules |
Use Scenario: Overvoltage protection for constant-current LED drivers used in architectural lighting where 24 V supply lines run alongside data cables. IC Role / Device Role / Timing Role: Standoff-rated TVS placed across driver input terminals to prevent latch-up or gate oxide rupture during ESD or capacitive coupling events. Use Value: 16 V VWM aligns precisely with 24 V nominal systems using 20–28 V operating range, enabling optimal clamping without false triggering. | Use Scenario: Front-end protection in adaptive front-lighting systems (AFS) where headlamp control boards interface with CAN bus and high-side switch drivers. IC Role / Device Role / Timing Role: Unidirectional clamping device referenced to vehicle ground, suppressing ISO 7637-2 Pulse 2b (battery disconnect) transients on power inputs. Use Value: AEC-Q101 qualification and MSL Level 1 ensure suitability for reflow-soldered automotive PCBs with zero post-assembly moisture concerns. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ16A | Lower VBR range (17.8–19.7 V) and lower VC (26.0 V); same package and PPPM | Offers tighter clamping for systems requiring stricter voltage ceiling; slightly higher leakage near VWM | Select SMAJ16A when clamping voltage margin is critical and VBR consistency across temperature is prioritized. |
| SMBJ16CH | Same VWM/VBR/VC specs but in larger DO-214AA (SMB) package; 600 W PPPM | Higher surge capacity suits higher-energy transients; requires larger PCB footprint and different pad layout | Choose SMBJ16CH only if 400 W is insufficient and board space allows DO-214AA footprint. |
Compared with SMAJ16A and SMBJ16CH, the SMAJ16CH provides optimal balance of AEC-Q101 compliance, compact DO-214AC footprint, and precise 28.8 V clamping-making it preferred for space-constrained automotive modules where 400 W surge handling suffices.
Availability
SMAJ16CH is available at Aetrix Electronics and suitable for automotive on-board DC/DC converters, industrial switching mode power supplies, and LED driver power inputs requiring stable component supply with full traceability and lifecycle management.
Supply support for SMAJ16CH 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
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and automotive-qualified components.
The SMAJ series is engineered specifically for AEC-Q101-compliant transient suppression in harsh automotive and industrial environments, emphasizing reliability, fast response, and standardized surface-mount compatibility.
FAQ
What is the polarity configuration of SMAJ16CH?
The SMAJ16CH is a unidirectional TVS diode with cathode indicated by a band on the DO-214AC package. It conducts in reverse bias during overvoltage events and blocks up to 16 V in forward direction. This polarity must be observed during PCB layout to ensure correct clamping orientation relative to the protected line and ground reference.
Does SMAJ16CH meet automotive qualification standards?
Yes, SMAJ16CH is AEC-Q101 qualified and tested per automotive stress requirements including temperature cycling, highly accelerated life testing, and ESD. It also complies with ISO 7637-2 for Pulse 1, 2a, 2b, 3a, and 3b, making it suitable for use in engine control units, lighting modules, and ADAS subsystems.
What is the maximum clamping voltage of SMAJ16CH under standard surge conditions?
The SMAJ16CH has a maximum clamping voltage (VC) of 28.8 V when subjected to its rated peak pulse current of 13.9 A under the 10/1000 µs waveform. This value is guaranteed across the full operating temperature range and defines the upper voltage limit imposed on protected circuitry during transient events.
Can SMAJ16CH be used in bidirectional configurations?
No - SMAJ16CH is unidirectional. For bidirectional protection, TSC offers the SMAJ16C variant (with "C" suffix indicating center-tap or symmetrical construction), or SMAJ16AH with modified breakdown symmetry. Using SMAJ16CH in reverse-biased signal paths without proper polarity alignment will result in unintended conduction or failure.
What packaging and moisture sensitivity level does SMAJ16CH have?
SMAJ16CH is supplied in DO-214AC (SMA) package on 7,500-piece tape-and-reel format and carries Moisture Sensitivity Level (MSL) 1 per J-STD-020 - meaning it can be stored indefinitely at ambient conditions without baking prior to reflow soldering.
SMAJ16CH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AC, SMA
- Series:
- SMAJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 16V
- Voltage - Breakdown (Min):
- 17.8V
- Voltage - Clamping (Max) @ Ipp:
- 28.8V
- Current - Peak Pulse (10/1000µs):
- 13.9A
- Power - Peak Pulse:
- 400W
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AC (SMA)
SMAJ16CH FAQ
1.How can I place an order for SMAJ16CH through Aetrix?
Please submit a Request for Quotation (RFQ) for SMAJ16CH 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 SMAJ16CH reliable?
The price and inventory of SMAJ16CH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMAJ16CH is usually 5 days.
3.What payment methods are accepted for SMAJ16CH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMAJ16CH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMAJ16CH?
SMAJ16CH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMAJ16CH 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 SMAJ16CH?
For technical support, including SMAJ16CH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMAJ16CH requirements.
6.How does Aetrix verify that SMAJ16CH is sourced from the original manufacturer or authorized distributors?
All SMAJ16CH 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 SMAJ16CH meets industry standards.
7.What is the process for return or replacement of SMAJ16CH?
All SMAJ16CH units undergo pre-shipment inspection (PSI). If there is an issue with SMAJ16CH, 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 SMAJ16CH part is unused and in its original packaging.
Return procedure for SMAJ16CH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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