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Home > Products > Circuit Protection > Transient Voltage Suppressors (TVS) > TVS Diodes

STMicroelectronics LDP01-35AY

Name: LDP01-35AY
Brand: STMicroelectronics
SKU: LDP01-35AY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LDP01-35AY

Manufacturer:: STMicroelectronics

Category:: TVS Diodes

Package:: TO-263-3, D2PAK (2 Leads + Tab), TO-263AB

Datasheet:: LDP01-35AY.pdf

Description:: TVS DIODE 30VWM 45.5VC D2PAK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

LDP01-35AY from STMicroelectronics is an AEC-Q101-qualified automotive Transil™ TVS diode in D²PAK package, designed for load-dump protection in 12 V/24 V vehicle electrical systems. It features a 35 V nominal breakdown voltage (33.3–36.9 V), clamps to ≤45.5 V at 95 A (10/1000 µs), delivers 1.15 kW peak pulse power at T_j = 25 °C, and operates up to 175 °C junction temperature - deployed in engine control units and body control modules.

For engineers reviewing the LDP01-35AY datasheet, LDP01-35AY pinout, LDP01-35AY application, or LDP01-35AY equivalent, key selection criteria include ISO 7637-2 Pulse 5a/5b clamping performance, low 1 µA leakage at 25 °C, thermal robustness under sustained load-dump stress, and D²PAK mounting compatibility with high-power PCB layouts.

Technical Context

The LDP01-35AY uses planar silicon technology to achieve stable avalanche characteristics across -55 °C to +175 °C junction temperature range, enabling reliable operation during extended high-temperature engine bay conditions. Its dynamic impedance of 20 mΩ ensures predictable clamping behavior under fast-rising transients like ISO 10605 ESD events.

It complies with ISO 7637-2 (Pulse 1, 2a, 3a, 3b, 5a/5b) and ISO 16750-2 (Tests A and B), delivering defined clamping voltages at specified surge currents - e.g., ≤60 V at 1150 A (8/20 µs) - while maintaining <1 µA reverse leakage at rated standoff voltage of 30 V.

Key Specifications

Parameter	Value and Actual Design Meaning
Breakdown Voltage (V_BR)	33.3–36.9 V at I_R = 1 mA - defines minimum voltage at which device enters controlled avalanche conduction during overvoltage events
Standoff Voltage (V_RM)	30 V - maximum continuous reverse operating voltage before significant leakage; ensures no false triggering in 24 V nominal systems
Clamping Voltage (V_CL)	45.5 V at I_PP = 95 A (10/1000 µs) - limits downstream circuit voltage during load-dump surges to safe levels for MCU and sensor ICs
Peak Pulse Power (P_PP)	1.15 kW at T_j = 25 °C - sustains high-energy transients without thermal runaway when mounted on adequate copper area
Junction Temperature Range	-55 to +175 °C - supports under-hood deployment in modern vehicles where ambient temperatures exceed 125 °C
Leakage Current (I_R)	1 µA at V_RM = 30 V and T_j = 25 °C - minimizes standby power loss and avoids interference with high-impedance sensor bias networks
Dynamic Impedance (R_D)	20 mΩ - determines voltage rise above V_BR under surge current (ΔV = R_D × I_PP), critical for precise clamping design

Pinout & Package

Package: D²PAK (TO-263AB), surface-mount, single-diode configuration with cathode marked by bar on top surface. Thermal resistance R_th(j-c) = 0.24 °C/W enables efficient heat transfer to PCB copper pour.

Pin/Terminal	Circuit Role	Design Meaning
Anode (Pin 1)	Surge current entry point during positive transients	Connected to protected line (e.g., battery rail); must be routed with low-inductance trace to minimize overshoot
Cathode (Pin 2)	Surge current return path to ground reference	Requires direct low-impedance connection to chassis or power ground plane to sustain 95 A peak current without voltage bounce
Tab (Pin 3)	Thermal and electrical connection to cathode	Electrically tied to cathode; soldered to large copper area for thermal dissipation and enhanced current handling

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive-grade reliability including temperature cycling, HTRB, and surge endurance per JESD22-A108 and A118
ISO 7637-2 Pulse 5a/5b compliance	Clamps 150 V/220 V transients (t_d = 150–400 ms) to ≤60 V at R_i = 0.5 Ω, protecting ECUs against alternator load-dump energy
UL 94 V0 resin housing	Self-extinguishing epoxy prevents flame propagation in enclosed engine compartments during fault conditions
Low temperature coefficient (α_T = 9.9 × 10⁻⁴/°C)	Ensures stable V_BR and V_CL across full operating temperature range - critical for consistent protection in cold cranking and hot soak
JEDEC-standard D²PAK outline	Enables drop-in replacement in existing high-power TVS footprints and compatibility with standard SMT reflow profiles

Applications

Engine Control Unit (ECU)

Body Control Module (BCM)

Use Scenario: Protects microcontroller power rails and CAN transceiver interfaces from alternator load-dump surges during battery disconnection.

IC Role / Device Role: Primary bidirectional transient voltage suppressor placed between battery input and DC-DC converter input stage.

Use Value: Limits clamped voltage to ≤45.5 V at 95 A, preventing damage to 3.3 V/5 V logic supplies and ensuring system reset-free operation after surge.

Use Scenario: Shields LIN bus transceivers and door module sensors from ISO 16750-2 Test A/B surges during ignition cycling.

IC Role / Device Role: Standoff-rated TVS on 12 V supply line upstream of linear regulators powering analog sensor front-ends.

Use Value: Maintains <1 µA leakage at 30 V, avoiding signal offset errors in precision current-sense amplifiers and Hall-effect position sensors.

Advanced Driver Assistance Systems (ADAS)

Electric Power Steering (EPS)

Use Scenario: Safeguards radar processor power inputs against coupled transients from adjacent high-current actuators in ADAS domain controllers.

IC Role / Device Role: Secondary protection stage following primary fuse and choke filtering, absorbing residual energy not attenuated by passive filters.

Use Value: Delivers 1.15 kW peak power handling at 175 °C, sustaining repeated surges without parameter drift in thermally constrained radar enclosures.

Use Scenario: Guards motor driver gate drivers and current-shunt amplifier supplies from commutation-induced spikes in EPS H-bridge circuits.

IC Role / Device Role: Low-inductance TVS mounted directly at power connector entry point to minimize loop area and overshoot.

Use Value: Achieves 20 mΩ dynamic impedance, reducing clamping overshoot by >15% compared to standard TVS diodes, preserving MOSFET gate oxide integrity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive load-dump protection applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
SMAJ33A	DO-214AC package; 33 V V_BR; 600 W P_PP; higher R_D = 45 mΩ	Limited to lower-energy transients (ISO 7637-2 Pulse 1/2a); unsuitable for Pulse 5a/5b in 24 V systems	Select only for cost-sensitive non-critical 12 V subsystems where peak surge current <40 A
SMCJ36A	DO-214AB package; 36 V V_BR; 1.5 kW P_PP; R_th(j-c) = 0.45 °C/W	Higher clamping (≤64.5 V @ 100 A) and lower thermal efficiency than D²PAK; requires larger heatsink area	Preferable only when board space allows larger footprint and thermal management supports higher junction rise

Compared with SMAJ33A and SMCJ36A, the LDP01-35AY provides superior thermal performance (R_th(j-c) = 0.24 °C/W), tighter clamping (45.5 V vs. ≥60 V), and verified Pulse 5a/5b capability - making it the optimal choice for high-reliability engine bay electronics requiring minimal voltage overshoot and long-term stability at 175 °C.

Availability

LDP01-35AY is available at Aetrix Electronics and suitable for engine control units, body control modules, and ADAS domain controllers requiring stable component supply with full automotive qualification and long-lifecycle support.

Supply support for LDP01-35AY 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, specializing in automotive, industrial, and power discrete technologies with over 40 years of automotive qualification expertise.

The LDP01-xxAY series belongs to ST's Transil™ automotive TVS portfolio, engineered specifically for robust load-dump protection in 12 V/24 V vehicle architectures - emphasizing thermal resilience, low leakage, and standardized compliance with ISO and AEC standards.

FAQ

What is the maximum clamping voltage of LDP01-35AY under ISO 7637-2 Pulse 5a conditions?

The LDP01-35AY clamps to ≤60 V at 1150 A (8/20 µs) and ≤45.5 V at 95 A (10/1000 µs). For Pulse 5a (t_d = 400 ms, R_i = 0.5 Ω), measured clamping remains ≤55 V at U_s = 70 V, as confirmed in Figure 6 of the datasheet. This ensures safe operation for 5 V logic supplies downstream.

Can LDP01-35AY replace LDP01-33AY or LDP01-39AY in existing designs?

Yes, but with design review: LDP01-35AY has V_BR = 33.3–36.9 V versus 31.1–34.3 V (LDP01-33AY) and 36.7–40.5 V (LDP01-39AY). Substitution affects standoff margin and clamping level - verify that 30 V V_RM still provides adequate headroom above system nominal voltage and that downstream ICs tolerate the 45.5 V clamping level.

Is the D²PAK package lead-free and RoHS-compliant?

Yes - the LDP01-35AY uses a RoHS- and halogen-free D²PAK package with UL 94 V0-compliant epoxy resin. Lead finish is matte tin, qualified for standard SnPb and lead-free reflow profiles per JEDEC J-STD-020, with maximum lead temperature of 260 °C for 10 seconds.

How does junction temperature affect breakdown voltage in LDP01-35AY?

V_BR increases linearly with junction temperature at α_T = 9.9 × 10⁻⁴/°C. At T_j = 175 °C, V_BR rises by ~14.9% over its 25 °C value: 35 V × (1 + 0.00099 × 150) ≈ 40.2 V. This is accounted for in clamping calculations using the formula V_BR(T_j) = V_BR(25 °C) × (1 + α_T × (T_j − 25)).

LDP01-35AY 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):: 30V

Voltage - Breakdown (Min):: 33.3V

Voltage - Clamping (Max) @ Ipp:: 45.5V

Current - Peak Pulse (10/1000µs):: 95A

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

LDP01-35AY FAQ

1.How can I place an order for LDP01-35AY through Aetrix?

Please submit a Request for Quotation (RFQ) for LDP01-35AY 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 LDP01-35AY reliable?

The price and inventory of LDP01-35AY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LDP01-35AY is usually 5 days.

3.What payment methods are accepted for LDP01-35AY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LDP01-35AY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LDP01-35AY?

LDP01-35AY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LDP01-35AY 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 LDP01-35AY?

For technical support, including LDP01-35AY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LDP01-35AY requirements.

6.How does Aetrix verify that LDP01-35AY is sourced from the original manufacturer or authorized distributors?

All LDP01-35AY 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 LDP01-35AY meets industry standards.

7.What is the process for return or replacement of LDP01-35AY?

All LDP01-35AY units undergo pre-shipment inspection (PSI). If there is an issue with LDP01-35AY, 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 LDP01-35AY part is unused and in its original packaging.

Return procedure for LDP01-35AY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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