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STMicroelectronics LDP01-26AY
- Part No.:
- LDP01-26AY
- Manufacturer:
- STMicroelectronics
- Category:
- TVS Diodes
- Package:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Datasheet:
-
LDP01-26AY.pdf
- Description:
- TVS DIODE 22VWM 36VC D2PAK
- Quantity:
- Payment:
- Shipping:
Inventory:3,645
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Product details
Overview
LDP01-26AY from STMicroelectronics is an AEC-Q101-qualified automotive Transil™ TVS diode designed for load-dump protection in 12 V vehicle electrical systems. It features a 26 V nominal breakdown voltage (24.4–27.0 V), clamps to ≤36 V at 140 A (10/1000 µs), delivers 5.47 kW peak pulse power at Tj = 25 °C, and operates up to 175 °C junction temperature - deployed across engine control units, body control modules, and infotainment power rails.
For engineers reviewing the LDP01-26AY datasheet, LDP01-26AY pinout, LDP01-26AY application, or LDP01-26AY equivalent, key selection criteria include ISO 7637-2 Pulse 5a/5b and ISO 16750-2 Test A/B compliance, low 1 µA leakage at 25 °C, D²PAK thermal resistance of 0.24 °C/W, and verified clamping performance under 150 V reverse surge conditions.
Technical Context
The LDP01-26AY is a unidirectional planar silicon avalanche diode optimized for transient overvoltage suppression during automotive load-dump events. Its structure enables stable breakdown at 26 V with <±5% tolerance, low dynamic impedance (64 mΩ), and predictable voltage temperature coefficient (9.6 × 10−4/°C).
It meets IEC 61000-4-2 (±30 kV), ISO 10605 (±30 kV), and ISO 7637-2 Pulse 1 (−150 V), 2a (+112 V), 3a (−220 V), 3b (+150 V) - with clamping validated up to 140 A peak pulse current and full operation across −55 °C to +175 °C junction range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Breakdown Voltage (VBR) | 24.4–27.0 V at IR = 1 mA - ensures reliable turn-on before downstream IC damage during 12 V system surges |
| Clamping Voltage (VCL) | ≤36 V at IPP = 140 A (10/1000 µs) - limits protected circuit voltage below 40 V threshold for most automotive MCUs |
| Peak Pulse Power | 5.47 kW at Tj = 25 °C - sustains ISO 7637-2 Pulse 5a (load dump) without thermal runaway |
| Leakage Current | ≤1 µA at VRM = 22 V, 25 °C - prevents battery drain in always-on vehicle subsystems |
| Junction Temperature Range | −55 °C to +175 °C - supports under-hood placement near engines and transmission ECUs |
| Dynamic Impedance | 64 mΩ - enables fast, low-voltage overshoot suppression during sub-microsecond transients |
| AEC-Q101 Qualified | Validated for automotive reliability - required for safety-critical power rail protection per OEM specs |
Pinout & Package
Packaged in JEDEC-registered D²PAK (TO-263AB) with exposed copper thermal pad for low Rth(j–c) = 0.24 °C/W. Anode and cathode terminals are accessible on the leads; both anodes must be connected per datasheet layout guidance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Pin 1 & 2) | Surge return path | Parallel anode connection required to handle full load-dump energy; ties to chassis ground or battery negative |
| Cathode (Pin 3) | Protected line input | Connects to 12 V supply rail upstream of DC-DC converters or linear regulators |
Key Features
| Feature | Design Value |
|---|---|
| Unidirectional load-dump clamping | Stable 26 V breakdown with ±5% tolerance ensures consistent protection across production lots and temperature |
| High-temperature operation | Rated for continuous 175 °C junction operation - eliminates derating in high-ambient under-hood locations |
| Low-leakage planar technology | 1 µA max leakage at 22 V enables >10-year battery standby life in always-on telematics modules |
| ISO 7637-2 Pulse 5a/5b compliance | Validated clamping at 140 A (10/1000 µs) meets OEM requirements for alternator-induced surges up to 150 V |
| D²PAK thermal performance | 0.24 °C/W junction-to-case resistance allows direct PCB copper pour mounting for efficient heat dissipation |
Applications
| Engine Control Unit (ECU) Power Input | Body Control Module (BCM) Supply Rail |
|---|---|
Use Scenario: Protects ECU 12 V input against alternator load-dump surges during battery disconnect events. IC Role / Device Role: Primary unidirectional TVS clamp placed between battery feed and input filter capacitor. Use Value: Clamps to ≤36 V within 100 ns, preventing overvoltage damage to MCU, CAN transceivers, and analog sensor interfaces. | Use Scenario: Shields BCM power domain from ISO 16750-2 Test A/B transients during vehicle start-stop cycles. IC Role / Device Role: Front-end transient suppressor on main 12 V distribution line feeding multiple LDOs and microcontrollers. Use Value: Maintains <1 µA leakage at 13.5 V nominal, avoiding parasitic drain in parked vehicle mode. |
| Infotainment System Power Supply | ADAS Camera Module Input Protection |
Use Scenario: Guards head-unit DC-DC converter input against ISO 7637-2 Pulse 3a/3b noise during ignition switching. IC Role / Device Role: Secondary surge protector downstream of main fuse, co-located with EMI filter. Use Value: Delivers 5.47 kW peak power handling at 25 °C, enabling single-device protection without parallel stacking. | Use Scenario: Secures 12 V camera power input against load-dump events in rear-view and surround-view systems. IC Role / Device Role: Compact, high-reliability TVS mounted directly at connector entry point on camera PCB. Use Value: AEC-Q101 qualification and 175 °C rating ensure functional safety compliance for ASIL-B camera power domains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive TVS load-dump protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMAJ26A | Lower peak power (400 W), SMA package, Rth(j–c) not specified, 26 V VBR min 23.1 V | Not AEC-Q101 qualified; limited to non-safety-critical cabin modules | Select only for cost-sensitive, non-automotive industrial use where 175 °C operation and load-dump validation are unnecessary |
| SMCJ26A-Q | AEC-Q101 qualified, SMC package, 3.3 kW peak power, VCL = 42.1 V @ 113 A (10/1000 µs) | Higher clamping voltage reduces margin for 3.3 V logic rails; requires larger board area than D²PAK | Prefer when footprint constraints allow SMC and system design tolerates higher clamping voltage |
Compared with SMAJ26A and SMCJ26A-Q, the LDP01-26AY provides superior thermal management (0.24 °C/W), lower clamping (36 V vs. 42.1 V), and higher surge current capacity (140 A), making it optimal for compact, high-power automotive power rails requiring long-term under-hood reliability.
Availability
LDP01-26AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and infotainment systems requiring stable component supply with full automotive qualification and traceable sourcing.
Supply support for LDP01-26AY 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and automotive-grade protection components.
The LDP01-xxAY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for robust load-dump and ISO 7637-2 transient suppression in 12 V vehicle architectures.
FAQ
What is the maximum clamping voltage of LDP01-26AY under ISO 7637-2 Pulse 5a conditions?
The LDP01-26AY clamps to ≤36 V at 140 A (10/1000 µs), which corresponds to ISO 7637-2 Pulse 5a (load dump) with 300 ms duration and 0.5 Ω source impedance. This value is measured at Tj = 25 °C and remains ≤42 V at Tj = 175 °C using the published temperature coefficient of 9.6 × 10−4/°C.
Can LDP01-26AY replace LDP01-28AY in a design?
No - LDP01-26AY has a lower breakdown voltage range (24.4–27.0 V) versus LDP01-28AY (26.7–29.5 V), resulting in earlier conduction and potentially excessive leakage or premature clamping in 14 V nominal systems. Substitution requires revalidation of stand-off margin, clamping headroom, and thermal stress under worst-case load-dump.
Is the D²PAK package lead-free and RoHS-compliant?
Yes - the LDP01-26AY uses a RoHS- and halogen-free D²PAK package with UL 94 V0-rated epoxy resin. Lead finish is matte tin, and the device complies with JEDEC J-STD-020 moisture sensitivity level 1 (MSL1), allowing unlimited floor life at ≤30 °C/60% RH.
How does the 175 °C junction rating impact PCB layout?
The 175 °C rating enables direct mounting on large copper pours without thermal derating - the D²PAK's 0.24 °C/W Rth(j–c) allows ≥50% higher power dissipation than SMC packages at same board area. Layout must expose the thermal pad fully, use ≥4 thermal vias (0.3 mm diameter), and avoid solder mask over the pad to maintain thermal integrity.
LDP01-26AY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- TO-263-3, D2PAK (2 Leads + Tab), TO-263AB
- Series:
- LDP01Y, TRANSIL™
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- 1
- Bidirectional Channels:
- -
- Voltage - Reverse Standoff (Typ):
- 22V
- Voltage - Breakdown (Min):
- 24.4V
- Voltage - Clamping (Max) @ Ipp:
- 36V
- Current - Peak Pulse (10/1000µs):
- 140A
- Power - Peak Pulse:
- -
- Power Line Protection:
- No
- Applications:
- -
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 175°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q101
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- D2PAK
LDP01-26AY FAQ
1.How can I place an order for LDP01-26AY through Aetrix?
Please submit a Request for Quotation (RFQ) for LDP01-26AY 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 LDP01-26AY reliable?
The price and inventory of LDP01-26AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-26AY is usually 5 days.
3.What payment methods are accepted for LDP01-26AY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-26AY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LDP01-26AY?
LDP01-26AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LDP01-26AY 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 LDP01-26AY?
For technical support, including LDP01-26AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-26AY requirements.
6.How does Aetrix verify that LDP01-26AY is sourced from the original manufacturer or authorized distributors?
All LDP01-26AY 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 LDP01-26AY meets industry standards.
7.What is the process for return or replacement of LDP01-26AY?
All LDP01-26AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-26AY, 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 LDP01-26AY part is unused and in its original packaging.
Return procedure for LDP01-26AY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LDP01-26AY Tags
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